EE R4
問題一覧
1
The no conductors of a transmission fine camy equal curent l in opposite direcion. The force on each conductor is
proportional to i
2
A material which is slightly repelled by a magnelic field is known as
diamagnetic material
3
The ratio of intensity of magnetization to the magnetization force is known as
susceptibility
4
Paramagnetic materials have relative permeability
slightly > 1
5
The unit of magnetic flux is
weber
6
Permeability in a magnetic circuit corresponds to in an electric circuit.
conductivity
7
What is the slip in percent of an induction motor running 427 pm?
5%
8
Three 333 kVA transformers are:delta connected, one connection has been cut, what is the maximum kVA that can be supplied by the remaining transformers?
577
9
What is the standard device number for overvoltage relay?
59
10
A three-phase wye-delta connected, 345/34,5 KV transformer has an emergency rating of 60 MVA.
Determine the CT ratio and CT connections required for the protection of the transformer secondary.
1000:5 delta
11
The unit of capacitance is
coulombs/volts.
12
The total electric flux through any closed surface surrounding charges is equal to the amount of charge enclosed. The above statement is associated with
gauss's law
13
Voltage across capacitor at any time t during charging from a DC source of voltage V is given by
v = V(1- e^-t/λ)
14
The breakdown voltage for paper capacitors is usually
200 to 1600 volts
15
The property of a material which opposes the creation of magnetic flux in it is known as
reluctance
16
The coefficient of self-inductance for a coil is given as
nφ/I
17
A 500 tums solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage?
0.5 s
18
"The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity". The above statement is associated with
faraday's law of electrolysis
19
The capacity of a lead-acid cell is measured in
ampere-hours
20
The storage battery generally used in electric power station is
lead-acid battery
21
The peak value of a sine wave is 200 V. Its average-value Is 200 V
141.4 V
22
The power consumed in a circuit element will be least when the phase difference between the current and voltage is
90°
23
The commutator segments are connected to the armature conductors by means of
copper lugs
24
For a DC generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher emf?
wave winding
25
Iron losses in a DC machine are independent of variation in
load
26
Brushes of DC machines are made of
carbon
27
No-load speed of which of the following motor will be highest?
series motor
28
Small DC motors up to 5 H.P. usually have
2 poles
29
The mechanical power developed by a shunt motor will be maximum when the ratio of back emf to applied voltage is
0.5
30
The no-load current drawn by transformer is usually. what per cent of the full-load current?
2 to 5 percent
31
The dielectric strength of transformer oil is expected to be
33 kV
32
The maximum efficiency of a distribution transformer is
at 50% full load
33
The frequency of the voltage generated in large alternators
50 hz
34
The number of poles in turbo-alternators is usually
2
35
Harmonic component of generated E.M.F. Will be more in
full pitch coil
36
The dark and bright lamp method is used for
synchronizing
37
An alternator driven by a Francis hydraulic turbine is a ... alternator?
low or medium speed
38
For low head and high discharge, the hydraulic turbine used is
Kaplan turbine
39
Which device is used to change the kW output of generators in parallel?
Synchroscope
40
Which motor is used in food mixer?
Universal motor
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1
The no conductors of a transmission fine camy equal curent l in opposite direcion. The force on each conductor is
proportional to i
2
A material which is slightly repelled by a magnelic field is known as
diamagnetic material
3
The ratio of intensity of magnetization to the magnetization force is known as
susceptibility
4
Paramagnetic materials have relative permeability
slightly > 1
5
The unit of magnetic flux is
weber
6
Permeability in a magnetic circuit corresponds to in an electric circuit.
conductivity
7
What is the slip in percent of an induction motor running 427 pm?
5%
8
Three 333 kVA transformers are:delta connected, one connection has been cut, what is the maximum kVA that can be supplied by the remaining transformers?
577
9
What is the standard device number for overvoltage relay?
59
10
A three-phase wye-delta connected, 345/34,5 KV transformer has an emergency rating of 60 MVA.
Determine the CT ratio and CT connections required for the protection of the transformer secondary.
1000:5 delta
11
The unit of capacitance is
coulombs/volts.
12
The total electric flux through any closed surface surrounding charges is equal to the amount of charge enclosed. The above statement is associated with
gauss's law
13
Voltage across capacitor at any time t during charging from a DC source of voltage V is given by
v = V(1- e^-t/λ)
14
The breakdown voltage for paper capacitors is usually
200 to 1600 volts
15
The property of a material which opposes the creation of magnetic flux in it is known as
reluctance
16
The coefficient of self-inductance for a coil is given as
nφ/I
17
A 500 tums solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage?
0.5 s
18
"The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity". The above statement is associated with
faraday's law of electrolysis
19
The capacity of a lead-acid cell is measured in
ampere-hours
20
The storage battery generally used in electric power station is
lead-acid battery
21
The peak value of a sine wave is 200 V. Its average-value Is 200 V
141.4 V
22
The power consumed in a circuit element will be least when the phase difference between the current and voltage is
90°
23
The commutator segments are connected to the armature conductors by means of
copper lugs
24
For a DC generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher emf?
wave winding
25
Iron losses in a DC machine are independent of variation in
load
26
Brushes of DC machines are made of
carbon
27
No-load speed of which of the following motor will be highest?
series motor
28
Small DC motors up to 5 H.P. usually have
2 poles
29
The mechanical power developed by a shunt motor will be maximum when the ratio of back emf to applied voltage is
0.5
30
The no-load current drawn by transformer is usually. what per cent of the full-load current?
2 to 5 percent
31
The dielectric strength of transformer oil is expected to be
33 kV
32
The maximum efficiency of a distribution transformer is
at 50% full load
33
The frequency of the voltage generated in large alternators
50 hz
34
The number of poles in turbo-alternators is usually
2
35
Harmonic component of generated E.M.F. Will be more in
full pitch coil
36
The dark and bright lamp method is used for
synchronizing
37
An alternator driven by a Francis hydraulic turbine is a ... alternator?
low or medium speed
38
For low head and high discharge, the hydraulic turbine used is
Kaplan turbine
39
Which device is used to change the kW output of generators in parallel?
Synchroscope
40
Which motor is used in food mixer?
Universal motor