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145問 • 1年前
  • Jeo Clyde Arizo
    • 通報

    問題一覧

  • 1

    What will happen if a low impedance connection is accidentally created across a charged capacitor within a high-voltage electrical network?

    Large amounts of power can be quickly discharged.

  • 2

    When troubleshooting an electronic circuit, a cold solder joint can be located with the aid of an ohmmeter. Once the problem has been located, what should you do next?

    reheat connection with a soldering tool and recheck with an ohmmeter

  • 3

    What kind of overload relay that is being actuated by an electromagnetic coil?

    Magnetic

  • 4

    What kind of resistance thermometer utilizes semi-conductor material which have a characteristic of a resistance decrease with temperature increase?

    Thermistor

  • 5

    What is the ratio of effective value of the counter EMF in volts to the effective value of the current in amperes?

    inductive reactance

  • 6

    The amount of sodium phosphate in treated boiler water can be measured by ?

    Phosphate test

  • 7

    What determines the power factor of an electrical distribution system being supplied by a single AC generator?

    By components of the connected load

  • 8

    An instantenous trip type fuse will?

    open as soon as the loadcurrent exceeds the set point

  • 9

    What is the transformer winding where power source is connected?

    Primary winding

  • 10

    When a solid-state component of an electronic circuit is mounted to a metalic mass, the general purpose of that mass is to _____.

    act as a heat sink

  • 11

    A bus disconnect link is used to isolate?

    the generator ccircuit breaker from the bus

  • 12

    After clipping the two leads together, prior to taking a resistance reading with a volt-ohm- milliammeter, the 'zero' setting must be adjusted. ylf you find the adjustment knob will not return the pointer to zero', it is likely an indication of?

    Batteries are weak

  • 13

    Electric propulsion coupling excitation is reduced at slow speed to

    prevent coupling overheating

  • 14

    Which of the following problems will most likely occur if the starting winding of a split- phase induction motor failed to cutout once the motor was in continuous operation?

    The winding will burn out.

  • 15

    What do you call the emission of electrons from hot bodies?

    radiation effect

  • 16

    Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components?

    Increase ambient temperature decreases the service life of electronic components

  • 17

    The first requirement for logical trouble shooting of any system is the ability to ______

    recognize normal operation

  • 18

    What is the use of a magnetic blowout coil in a ship,s crane using DC motor controller contactor?

    prevent contact melting

  • 19

    In SF6 circuit breakers what is the meaning of SF6?

    Sulfur hexafluoride

  • 20

    When trouble shooting electronic equipment, you should use a high impedance multimeter ______.

    so as not to load down the circuit and obtain erroneous voltage readings

  • 21

    How would you show your understanding to a communication device that allows to talk to each other with the use of a handset, similar to a conventional telephone but without the use of external power ?

    Sound-powered teelephone system

  • 22

    In a liquid dielectric, which of the following impurity has significant effect in reducing the breakdown strength?

    Dust

  • 23

    A loss of field excitation to an AC generator while operating in parallel will cause to _____ .

    lose its load begin to motorize trip out on reverse power delay, and possibly overspeed

  • 24

    On an engine throttle control system, the auxiliary control circuits are provided with devices to prevent excessive over travel of the pilot valve by the synchronous motor. These devices are called_____.

    limit switches

  • 25

    In a faceplate-type motor starter, the starting arm is held in the 'OFF' position by a/an

    strong spring

  • 26

    The shunt use in an ammeter should be connected to?

    series with the load and in parallel with the meter movement

  • 27

    Which of the following statements concerning analog and digital devices are correct?

    The variables in digital systems are fixed quantities, and the variables in analog systems are contnuous quantities

  • 28

    Which of the following statements represents an application of a silicon controlled rectifier?

    Not synchronized, current is flowing and the relays are closed

  • 29

    To locate a grounded field coil in a synchronous motor, which of the instruments listed could be used?

    Megohmmeter

  • 30

    You are attempting to parallel two AC generators, and the synchroscope pointer is revolving past in the clockwise direction. What indicates that the frequency of the incoming machine?

    higher than the bus frequency

  • 31

    It is defined as the movement of electrical charge (the flow of electrons) through an electrical circuit is called?

    Current

  • 32

    What represents an application of a silicon controlled rectifier?

    To provide DC power for a main propulsion motor.

  • 33

    In a circuit that is not energized, which of the listed instrument is used?

    Ohmmeter

  • 34

    How is the operator ensured that he is not in contact with any unearthed conductor before insulation resistance (IR) measurement of a HV system?

    Connct the insulation resistance tester to the conductor with safety earth connection ON

  • 35

    What is the process of breaking up fuel oil into fine particles to ensure good combustion?

    Atomization

  • 36

    How do shipboard electrical cables cross-sectional area express?

    circular mills

  • 37

    RTD type sensor utilizes which principle in temperature measurement?

    Wheatstone bridge principle

  • 38

    What is the first step in removing a generator from parallel operation.?

    Decrease the governor setting on the \'off going generator.

  • 39

    Which of the following indicate when paralleling two alternators, the synchronizing lamps remain lit as the synchroscope pointer approaches the 0° position?

    synchroscope is defective or broken

  • 40

    What cause the main feed pump which can handle high temperature water without becoming vapor bound?

    Required net positive suction pressure is designed into the system

  • 41

    What is the degree angle when the voltage and current are out of phase so that the true power is equal to zero?

    90

  • 42

    The following are main things you should ccheck when synchronizing a generator except for?

    Icurrent

  • 43

    What type of widely used thermocouple, also termed as Ni-Chromium/Ni-Alumel, with enhanced reliability, preciseness, inexpensive and operate at temperature ranges between -270 to 1,260 degC?

    Type K

  • 44

    Ammeters and voltmeters use in a sinusoidal AC power system indicates which of the following values of the waveforms measured?

    root means square value

  • 45

    The following are rating of circuit breakers except ______.

    Rated short ionization current

  • 46

    a triac thyristor functions as a control device and is basically ______.

    two-back-to back SCR's with a common gate lead

  • 47

    In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness. When the test button is pushed, all lamps have equal illunination. You should called that ______.

    There is a ground on the line with the dark lamp

  • 48

    While starting a synchronous motor, the ammeter pegs out at maximum and then returns to the proper value after synchronization. What is this an indication of?

    motor has started properly

  • 49

    When using an ohmmeter to test a semi conductor diode, you find a low resistance in both forward and reverse bias direction. This indicates that the diode is _____

    Short

  • 50

    On a vessel with turbo-electric drive, which of the following conditions would indicate that the propulsion motor had cut-out from synchronization with the propulsion generator?

    Excessive vibration of the vessel

  • 51

    A field effect transistor function that reduces number of current carries passing through its channel ______.

    depletion mode

  • 52

    Which of the listed pairs of materials make the best insulators?

    glass and mica

  • 53

    All portable electric tools should have a ground connection to prevent?

    electric shock if the tool is shorted

  • 54

    The governor control switch of an alternator is move to the raised position. This action will ______.

    raise the no-load speed setting of the governor

  • 55

    Which of the following statements is correct concerning the circuits in a sound powered telephone system?

    The common talking circuit is composed of two ungrounded wires

  • 56

    When trouble shooting electronic equipment, you should use a high impedance multimeter ______.

    so as not to load down the circuit and obtain erroneous voltage readings

  • 57

    The standard method of controlling the output voltage of a 440 volt, 60 Hz, AC generator is accomplished by adjusting the ______.

    alternator field excitation

  • 58

    When trouble shooting electronic equipment, the first step to be taken before testing the circuit voltage is to ______.

    check the voltage supply from the power source

  • 59

    What device that gives the information about the speed of a motor in D. C. Generator?

    Speedometer

  • 60

    A ship is generating 8MW of power at 440V from 4 diesel generator of 2MW 0.8 power factor each. How much full-load current each generator feeder cable and circuit breaker be able to handle?

    3,280 Amperes

  • 61

    It is a type of motor that is almost the same as an alternator.

    Synchonous motor

  • 62

    To minimize magnetic field interaction between electrical conductors in physical proximity, it is best to keep them?

    at right angles and as far as practicable

  • 63

    To be considered as High Volatge system used on board a ship, how much should be the minimum voltage?

    1,000V

  • 64

    The magnetic energy of a transformer when created will further induced current in the ?

    secondary winding

  • 65

    When the voltage and current developed in AC circuit reached thier peak value at the same time, the power factor is ?

    maximum

  • 66

    In general, polyphase induction motors can be started on full line voltage by what means?

    across-the-line starters

  • 67

    What do you call a conductor carrier opposite to the majority current carrier which are represented by the holes in n-type material and free electrons in p-type material?

    Minority current carrier

  • 68

    What is being used to indicate whether the alternator is running faster or slower than the ther. What is this device installed in the main switchboard?

    Synchroscope

  • 69

    When trouble shooting most electronic circuits. "loading effect" can be minimized by using a volt volt meter with a/an ______.

    input impedance much greater than the impedance across which the voltage is being measured

  • 70

    On a vessel with turbo-electric drive, which of the following conditions would indicate that the propulsion motor had dropped out from synchronization with the propulsion generator?

    Excessive vibration of the vessel

  • 71

    Which of the stated pressure conditions identifies the boiler design pressure?

    The pressure specified by the manufacturer as a criteria for boiler design

  • 72

    Regarding and AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated for by the ______.

    voltage regulator

  • 73

    Which of the following is developed whenever there is a relative motion of action between a magnetic field and a conductor?

    electromotive force

  • 74

    Four lamps are connected in parallel in a single circuit. If one of the lamp burns out, theothers will ______.

    burn with their original intensities

  • 75

    A closed loop control system which enables two or more valves operated by one controller is known as ______.

    Split range control

  • 76

    On some diesel-electric ships, the DC propulsion motor will only attain half speed when the generator fields are fully excited. Speeds above this are obtained by?

    raising the generator engine speed

  • 77

    Which of the following may cause a single-phase induction motor fails to start?

    an open in the main winding

  • 78

    A ship is generating 8MW of power at 440V from 4 diesel generator of 2MW 0.8 power factor each. How much full-load current each generator feeder cable and circuit breaker be able to handle?

    3,280 Amperes

  • 79

    Which of the following statement is true concerning a step-down transformer in an operating AC power circuit?

    Voltage decreases as current increases

  • 80

    Why is corrosion due to electrolytic action in modern water-tube boilers is uncommon?

    Boiler components are generally constructed of similar metals

  • 81

    Listed are the types of circuit breakers except?

    Ceramic circuit breaker

  • 82

    Which of the following refers to a characteristics of a magnetic line of force?

    it travels from north to south through the surrounding medium of bar magnet

  • 83

    Which of the following values of the waveforms measured in ammeters and voltmeters?

    root means square value

  • 84

    When troubleshooting an electronic circuit, a cold solder joint can be located with the aid of an ohmmeter. Once the problem has been located, what should you do next?

    reheat connection with a soldering tool and recheck with an ohmmeter

  • 85

    Two paralleled alternators are operating near rated load. If one trips out mechanically, which of the listed actions should be taken first?

    Strip the board of all nonvital circuits.

  • 86

    Ships fitted with high-voltage installations tend to use earthed neutral electrical networks. Which one of the following best describes how excessive fault currents are prevented in the event of an earth fault on these ships?

    Impedance is placed in neutral earthing line.

  • 87

    Silicon diodes designed for a specific reverse breakdown voltage, become useful as an electronic power supply voltage regulator, called ____.

    Zener diodes

  • 88

    A ground on a particular phase of a three phase low voltage system would be indicated by?

    dark or dim switchboard ground detectinglight

  • 89

    How can the hot spots in the bus bar or surrounding area be checked safely?

    By using infra-red thermal imaging device

  • 90

    In electronic industry, the abbreviation "PCB commonly means ____.

    Printed circuit board

  • 91

    What do you call a direct current passing through a wire coiled around a soft iron core?

    electromagnet

  • 92

    In synchronizing a generator with other generator, it is required that the voltage and frequency of the incoming generator is _____.

    Equal voltage, equal frequency

  • 93

    Equal power factors on paralleled AC generator are maintained by an automatic _____.

    voltage regulator

  • 94

    When electrocuted, how much current may lead to loss of muscular control?

    25 mA

  • 95

    Which of the following refers to a characteristics of a magnetic line of force?

    it travels from north to south through the surrounding medium of bar magnet

  • 96

    What do you call a motor using a rheostat in the mnotor circuit to vary the speed?

    Wound-rotor induction motor

  • 97

    What is the part of the shipboard electrical system used to control the distribution of power to the branch circuit?

    main switchboard

  • 98

    What is the main reason in using an electronic megger tester essentially for polarization index or Pi test.

    Because hand driven megger tester will not be able to give the steady test voltage for longer time

  • 99

    To provide its unique characteristics to analog circuits, the operational amplifier is made up of a/an _____.

    differential amp. voltage amp and output amp

  • 100

    What would you obtain if you measure voltage and current in an inductive or capacitive circuit and then multiply them together?

    apparent power

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    問題一覧

  • 1

    What will happen if a low impedance connection is accidentally created across a charged capacitor within a high-voltage electrical network?

    Large amounts of power can be quickly discharged.

  • 2

    When troubleshooting an electronic circuit, a cold solder joint can be located with the aid of an ohmmeter. Once the problem has been located, what should you do next?

    reheat connection with a soldering tool and recheck with an ohmmeter

  • 3

    What kind of overload relay that is being actuated by an electromagnetic coil?

    Magnetic

  • 4

    What kind of resistance thermometer utilizes semi-conductor material which have a characteristic of a resistance decrease with temperature increase?

    Thermistor

  • 5

    What is the ratio of effective value of the counter EMF in volts to the effective value of the current in amperes?

    inductive reactance

  • 6

    The amount of sodium phosphate in treated boiler water can be measured by ?

    Phosphate test

  • 7

    What determines the power factor of an electrical distribution system being supplied by a single AC generator?

    By components of the connected load

  • 8

    An instantenous trip type fuse will?

    open as soon as the loadcurrent exceeds the set point

  • 9

    What is the transformer winding where power source is connected?

    Primary winding

  • 10

    When a solid-state component of an electronic circuit is mounted to a metalic mass, the general purpose of that mass is to _____.

    act as a heat sink

  • 11

    A bus disconnect link is used to isolate?

    the generator ccircuit breaker from the bus

  • 12

    After clipping the two leads together, prior to taking a resistance reading with a volt-ohm- milliammeter, the 'zero' setting must be adjusted. ylf you find the adjustment knob will not return the pointer to zero', it is likely an indication of?

    Batteries are weak

  • 13

    Electric propulsion coupling excitation is reduced at slow speed to

    prevent coupling overheating

  • 14

    Which of the following problems will most likely occur if the starting winding of a split- phase induction motor failed to cutout once the motor was in continuous operation?

    The winding will burn out.

  • 15

    What do you call the emission of electrons from hot bodies?

    radiation effect

  • 16

    Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components?

    Increase ambient temperature decreases the service life of electronic components

  • 17

    The first requirement for logical trouble shooting of any system is the ability to ______

    recognize normal operation

  • 18

    What is the use of a magnetic blowout coil in a ship,s crane using DC motor controller contactor?

    prevent contact melting

  • 19

    In SF6 circuit breakers what is the meaning of SF6?

    Sulfur hexafluoride

  • 20

    When trouble shooting electronic equipment, you should use a high impedance multimeter ______.

    so as not to load down the circuit and obtain erroneous voltage readings

  • 21

    How would you show your understanding to a communication device that allows to talk to each other with the use of a handset, similar to a conventional telephone but without the use of external power ?

    Sound-powered teelephone system

  • 22

    In a liquid dielectric, which of the following impurity has significant effect in reducing the breakdown strength?

    Dust

  • 23

    A loss of field excitation to an AC generator while operating in parallel will cause to _____ .

    lose its load begin to motorize trip out on reverse power delay, and possibly overspeed

  • 24

    On an engine throttle control system, the auxiliary control circuits are provided with devices to prevent excessive over travel of the pilot valve by the synchronous motor. These devices are called_____.

    limit switches

  • 25

    In a faceplate-type motor starter, the starting arm is held in the 'OFF' position by a/an

    strong spring

  • 26

    The shunt use in an ammeter should be connected to?

    series with the load and in parallel with the meter movement

  • 27

    Which of the following statements concerning analog and digital devices are correct?

    The variables in digital systems are fixed quantities, and the variables in analog systems are contnuous quantities

  • 28

    Which of the following statements represents an application of a silicon controlled rectifier?

    Not synchronized, current is flowing and the relays are closed

  • 29

    To locate a grounded field coil in a synchronous motor, which of the instruments listed could be used?

    Megohmmeter

  • 30

    You are attempting to parallel two AC generators, and the synchroscope pointer is revolving past in the clockwise direction. What indicates that the frequency of the incoming machine?

    higher than the bus frequency

  • 31

    It is defined as the movement of electrical charge (the flow of electrons) through an electrical circuit is called?

    Current

  • 32

    What represents an application of a silicon controlled rectifier?

    To provide DC power for a main propulsion motor.

  • 33

    In a circuit that is not energized, which of the listed instrument is used?

    Ohmmeter

  • 34

    How is the operator ensured that he is not in contact with any unearthed conductor before insulation resistance (IR) measurement of a HV system?

    Connct the insulation resistance tester to the conductor with safety earth connection ON

  • 35

    What is the process of breaking up fuel oil into fine particles to ensure good combustion?

    Atomization

  • 36

    How do shipboard electrical cables cross-sectional area express?

    circular mills

  • 37

    RTD type sensor utilizes which principle in temperature measurement?

    Wheatstone bridge principle

  • 38

    What is the first step in removing a generator from parallel operation.?

    Decrease the governor setting on the \'off going generator.

  • 39

    Which of the following indicate when paralleling two alternators, the synchronizing lamps remain lit as the synchroscope pointer approaches the 0° position?

    synchroscope is defective or broken

  • 40

    What cause the main feed pump which can handle high temperature water without becoming vapor bound?

    Required net positive suction pressure is designed into the system

  • 41

    What is the degree angle when the voltage and current are out of phase so that the true power is equal to zero?

    90

  • 42

    The following are main things you should ccheck when synchronizing a generator except for?

    Icurrent

  • 43

    What type of widely used thermocouple, also termed as Ni-Chromium/Ni-Alumel, with enhanced reliability, preciseness, inexpensive and operate at temperature ranges between -270 to 1,260 degC?

    Type K

  • 44

    Ammeters and voltmeters use in a sinusoidal AC power system indicates which of the following values of the waveforms measured?

    root means square value

  • 45

    The following are rating of circuit breakers except ______.

    Rated short ionization current

  • 46

    a triac thyristor functions as a control device and is basically ______.

    two-back-to back SCR's with a common gate lead

  • 47

    In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness. When the test button is pushed, all lamps have equal illunination. You should called that ______.

    There is a ground on the line with the dark lamp

  • 48

    While starting a synchronous motor, the ammeter pegs out at maximum and then returns to the proper value after synchronization. What is this an indication of?

    motor has started properly

  • 49

    When using an ohmmeter to test a semi conductor diode, you find a low resistance in both forward and reverse bias direction. This indicates that the diode is _____

    Short

  • 50

    On a vessel with turbo-electric drive, which of the following conditions would indicate that the propulsion motor had cut-out from synchronization with the propulsion generator?

    Excessive vibration of the vessel

  • 51

    A field effect transistor function that reduces number of current carries passing through its channel ______.

    depletion mode

  • 52

    Which of the listed pairs of materials make the best insulators?

    glass and mica

  • 53

    All portable electric tools should have a ground connection to prevent?

    electric shock if the tool is shorted

  • 54

    The governor control switch of an alternator is move to the raised position. This action will ______.

    raise the no-load speed setting of the governor

  • 55

    Which of the following statements is correct concerning the circuits in a sound powered telephone system?

    The common talking circuit is composed of two ungrounded wires

  • 56

    When trouble shooting electronic equipment, you should use a high impedance multimeter ______.

    so as not to load down the circuit and obtain erroneous voltage readings

  • 57

    The standard method of controlling the output voltage of a 440 volt, 60 Hz, AC generator is accomplished by adjusting the ______.

    alternator field excitation

  • 58

    When trouble shooting electronic equipment, the first step to be taken before testing the circuit voltage is to ______.

    check the voltage supply from the power source

  • 59

    What device that gives the information about the speed of a motor in D. C. Generator?

    Speedometer

  • 60

    A ship is generating 8MW of power at 440V from 4 diesel generator of 2MW 0.8 power factor each. How much full-load current each generator feeder cable and circuit breaker be able to handle?

    3,280 Amperes

  • 61

    It is a type of motor that is almost the same as an alternator.

    Synchonous motor

  • 62

    To minimize magnetic field interaction between electrical conductors in physical proximity, it is best to keep them?

    at right angles and as far as practicable

  • 63

    To be considered as High Volatge system used on board a ship, how much should be the minimum voltage?

    1,000V

  • 64

    The magnetic energy of a transformer when created will further induced current in the ?

    secondary winding

  • 65

    When the voltage and current developed in AC circuit reached thier peak value at the same time, the power factor is ?

    maximum

  • 66

    In general, polyphase induction motors can be started on full line voltage by what means?

    across-the-line starters

  • 67

    What do you call a conductor carrier opposite to the majority current carrier which are represented by the holes in n-type material and free electrons in p-type material?

    Minority current carrier

  • 68

    What is being used to indicate whether the alternator is running faster or slower than the ther. What is this device installed in the main switchboard?

    Synchroscope

  • 69

    When trouble shooting most electronic circuits. "loading effect" can be minimized by using a volt volt meter with a/an ______.

    input impedance much greater than the impedance across which the voltage is being measured

  • 70

    On a vessel with turbo-electric drive, which of the following conditions would indicate that the propulsion motor had dropped out from synchronization with the propulsion generator?

    Excessive vibration of the vessel

  • 71

    Which of the stated pressure conditions identifies the boiler design pressure?

    The pressure specified by the manufacturer as a criteria for boiler design

  • 72

    Regarding and AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated for by the ______.

    voltage regulator

  • 73

    Which of the following is developed whenever there is a relative motion of action between a magnetic field and a conductor?

    electromotive force

  • 74

    Four lamps are connected in parallel in a single circuit. If one of the lamp burns out, theothers will ______.

    burn with their original intensities

  • 75

    A closed loop control system which enables two or more valves operated by one controller is known as ______.

    Split range control

  • 76

    On some diesel-electric ships, the DC propulsion motor will only attain half speed when the generator fields are fully excited. Speeds above this are obtained by?

    raising the generator engine speed

  • 77

    Which of the following may cause a single-phase induction motor fails to start?

    an open in the main winding

  • 78

    A ship is generating 8MW of power at 440V from 4 diesel generator of 2MW 0.8 power factor each. How much full-load current each generator feeder cable and circuit breaker be able to handle?

    3,280 Amperes

  • 79

    Which of the following statement is true concerning a step-down transformer in an operating AC power circuit?

    Voltage decreases as current increases

  • 80

    Why is corrosion due to electrolytic action in modern water-tube boilers is uncommon?

    Boiler components are generally constructed of similar metals

  • 81

    Listed are the types of circuit breakers except?

    Ceramic circuit breaker

  • 82

    Which of the following refers to a characteristics of a magnetic line of force?

    it travels from north to south through the surrounding medium of bar magnet

  • 83

    Which of the following values of the waveforms measured in ammeters and voltmeters?

    root means square value

  • 84

    When troubleshooting an electronic circuit, a cold solder joint can be located with the aid of an ohmmeter. Once the problem has been located, what should you do next?

    reheat connection with a soldering tool and recheck with an ohmmeter

  • 85

    Two paralleled alternators are operating near rated load. If one trips out mechanically, which of the listed actions should be taken first?

    Strip the board of all nonvital circuits.

  • 86

    Ships fitted with high-voltage installations tend to use earthed neutral electrical networks. Which one of the following best describes how excessive fault currents are prevented in the event of an earth fault on these ships?

    Impedance is placed in neutral earthing line.

  • 87

    Silicon diodes designed for a specific reverse breakdown voltage, become useful as an electronic power supply voltage regulator, called ____.

    Zener diodes

  • 88

    A ground on a particular phase of a three phase low voltage system would be indicated by?

    dark or dim switchboard ground detectinglight

  • 89

    How can the hot spots in the bus bar or surrounding area be checked safely?

    By using infra-red thermal imaging device

  • 90

    In electronic industry, the abbreviation "PCB commonly means ____.

    Printed circuit board

  • 91

    What do you call a direct current passing through a wire coiled around a soft iron core?

    electromagnet

  • 92

    In synchronizing a generator with other generator, it is required that the voltage and frequency of the incoming generator is _____.

    Equal voltage, equal frequency

  • 93

    Equal power factors on paralleled AC generator are maintained by an automatic _____.

    voltage regulator

  • 94

    When electrocuted, how much current may lead to loss of muscular control?

    25 mA

  • 95

    Which of the following refers to a characteristics of a magnetic line of force?

    it travels from north to south through the surrounding medium of bar magnet

  • 96

    What do you call a motor using a rheostat in the mnotor circuit to vary the speed?

    Wound-rotor induction motor

  • 97

    What is the part of the shipboard electrical system used to control the distribution of power to the branch circuit?

    main switchboard

  • 98

    What is the main reason in using an electronic megger tester essentially for polarization index or Pi test.

    Because hand driven megger tester will not be able to give the steady test voltage for longer time

  • 99

    To provide its unique characteristics to analog circuits, the operational amplifier is made up of a/an _____.

    differential amp. voltage amp and output amp

  • 100

    What would you obtain if you measure voltage and current in an inductive or capacitive circuit and then multiply them together?

    apparent power