EE R3
問題一覧
1
Which of the following is not a primary components of a transformer.
Flux
2
A fuse for an over current trip unit of a circuit breaker shall be connected in _____ with each undergrounded conductor
Series
3
Two Resistors are connected in series 2 ohms and 3 ohms and then connected in parallel. What is the total resistance when connected series?
5
4
A single grounding electrode is permitted when the resistance to ground does not exceed?
25 ohms
5
The overcurrent protection for 5.5 mm^2 TW (2.6 mm dia.) copper shall not exceed __ amperes.
30
6
A 25 kVA transformer delivers a load of 12 kW at 0.6 pf lagging. What is max load kVA at 0.866 leading to be added so as not exceed transformer rating.
12.8
7
Which is not true about the neutral conductor?
Never apply ampacity correction
8
Voltage in a generator is produced by
Cutting line of force.
9
Multiple start buttons in a motor control circuit as connected in
Parallel
10
Which one has the highest electrical breakdown strength and longest life over all other materials used for insulation.
Impregnated paper
11
The connection of a ground clamp to a grounding electrode shall be.
Accessible
12
An alternation is
one-half cycle
13
What is the combined opposition to current by resistance and reactance.
Z
14
A resistor has an indicated tolerance error of 10%. With a value of 1000 ohms, the minimum resistance the resistor may have is _____
900 Ω
15
To transmit power economically over considerable distances, it is necessary that the voltages be high. High voltages are readily obtainable with _____
AC
16
Electron low produced by means of applying pressure to a material is called _______
Piezoelectricity
17
An AC ammeter or voltmeter is calibrated to read rms values, this means the meter is reading ______ value
Effective
18
Raceways shall be provided with ________ to compensate for thermal expansion and contraction
Expansion joint
19
An instrument that is used to measure the diameter of a wire or cable to thousandths of an inch.
micrometer
20
Where the branch circuit supplied continuous loads or any combination of continuous or non-continuous load, the minimum branch circuit conductor size and overcurrent protection shall have allowable ampacity and rating shall not be less than ______ % the non-continuous load plus
______ percent of the continuous load.
100%, 125%
21
Determine the number of poles of induction motor running at 175 rpm.
6
22
Find the intensity of light source in candela if it gives illumination of 50 lux at a distance of 2m.
200
23
A dc generator internal resistance 0.15 ohm rated 120 volts charge two batteries A & B rated 90 volts, Battery A has internal resistance 0.32 ohm and battery B has internal 0.4 ohm respectively. Findthe charging voltage across the batteries.
106.3 V
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1
Which of the following is not a primary components of a transformer.
Flux
2
A fuse for an over current trip unit of a circuit breaker shall be connected in _____ with each undergrounded conductor
Series
3
Two Resistors are connected in series 2 ohms and 3 ohms and then connected in parallel. What is the total resistance when connected series?
5
4
A single grounding electrode is permitted when the resistance to ground does not exceed?
25 ohms
5
The overcurrent protection for 5.5 mm^2 TW (2.6 mm dia.) copper shall not exceed __ amperes.
30
6
A 25 kVA transformer delivers a load of 12 kW at 0.6 pf lagging. What is max load kVA at 0.866 leading to be added so as not exceed transformer rating.
12.8
7
Which is not true about the neutral conductor?
Never apply ampacity correction
8
Voltage in a generator is produced by
Cutting line of force.
9
Multiple start buttons in a motor control circuit as connected in
Parallel
10
Which one has the highest electrical breakdown strength and longest life over all other materials used for insulation.
Impregnated paper
11
The connection of a ground clamp to a grounding electrode shall be.
Accessible
12
An alternation is
one-half cycle
13
What is the combined opposition to current by resistance and reactance.
Z
14
A resistor has an indicated tolerance error of 10%. With a value of 1000 ohms, the minimum resistance the resistor may have is _____
900 Ω
15
To transmit power economically over considerable distances, it is necessary that the voltages be high. High voltages are readily obtainable with _____
AC
16
Electron low produced by means of applying pressure to a material is called _______
Piezoelectricity
17
An AC ammeter or voltmeter is calibrated to read rms values, this means the meter is reading ______ value
Effective
18
Raceways shall be provided with ________ to compensate for thermal expansion and contraction
Expansion joint
19
An instrument that is used to measure the diameter of a wire or cable to thousandths of an inch.
micrometer
20
Where the branch circuit supplied continuous loads or any combination of continuous or non-continuous load, the minimum branch circuit conductor size and overcurrent protection shall have allowable ampacity and rating shall not be less than ______ % the non-continuous load plus
______ percent of the continuous load.
100%, 125%
21
Determine the number of poles of induction motor running at 175 rpm.
6
22
Find the intensity of light source in candela if it gives illumination of 50 lux at a distance of 2m.
200
23
A dc generator internal resistance 0.15 ohm rated 120 volts charge two batteries A & B rated 90 volts, Battery A has internal resistance 0.32 ohm and battery B has internal 0.4 ohm respectively. Findthe charging voltage across the batteries.
106.3 V