Basic Electricity
Basic Electricity
- 1.
A 3 phase electric generator has coils which are wound with how many degrees of separation
- A.
6
- B.
120
- C.
60
- D.
150
Correct Answer
B. 120 -
- 2.
Wattage is the measure of
- A.
Power
- B.
Current
- C.
Potential
- D.
Inductance
Correct Answer
A. Power -
- 3.
An AC sine wave has which of the following characteristics?
- A.
Peak to peak amplitude
- B.
Root mean square (RMS) value
- C.
A corresponding current sine wave
- D.
All of the above
Correct Answer
D. All of the above -
- 4.
The difference between DC and AC is that AC is
- A.
Bi-directional
- B.
Always constant
- C.
Safer
- D.
Faster
Correct Answer
A. Bi-directional -
- 5.
Reactive Power in an AC circuit is termed
- A.
W
- B.
VA
- C.
VAR
- D.
Capacitive load
Correct Answer
C. VAR -
- 6.
Which of the following determines total power in a series circuit?
- A.
Source volage times the current
- B.
Total voltage applied to the circuit
- C.
Current flowing through a switch
- D.
Average of the wattage consumed by each resistor
Correct Answer
A. Source volage times the current -
- 7.
The formula fot calculating power factor in a 3 phase circuit is
- A.
Watts*1.732*volts
- B.
Watts/(volts*amps*1.732)
- C.
Volts/amps*1.732
- D.
Watts/(volts*amps*1.414)
Correct Answer
B. Watts/(volts*amps*1.732) -
- 8.
Concerning a 3 phase load, if KW is 170 and voltage is 480 at 240amps, What is the power factor?
- A.
0.95 lagging
- B.
0.95 leading
- C.
0.85 leading
- D.
0.85 lagging
Correct Answer
D. 0.85 laggingExplanation
PF=watts/(volts*amps*1.732)... 170,000/(480v*240a*1.732)=0.85 and is laggingRate this question:
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- 9.
Rectification involves
- A.
Preventing AC from alternating above and below 0 volts
- B.
Making DC alternate above and below 0 volts
- C.
Changing watts into Horse Power
- D.
Correcting Power Factor
Correct Answer
A. Preventing AC from alternating above and below 0 volts -
- 10.
If you think of a diode like a fluid system, its function is
- A.
Allow current flow in 2 directions like a hydraulic motor
- B.
Prevent current flow in one direction similar to a chech valve
- C.
Monitor current flow like a flow meter
- D.
Create flow like a hydraulic pump
Correct Answer
B. Prevent current flow in one direction similar to a chech valve -
- 11.
Which of the following will not affect the resistance of a conductor?
- A.
Size
- B.
Length
- C.
Insulation
- D.
Temperature
Correct Answer
C. Insulation -
- 12.
Voltage in an electrical system is calculated by the formula
- A.
E=P/I
- B.
E=I*R
- C.
E=√(P*R)
- D.
All of the above
Correct Answer
D. All of the above -
- 13.
What is the unit of measure electrical pressure or EMF?
- A.
Amps
- B.
Ohms
- C.
Volts
- D.
Watts
Correct Answer
C. Volts -
- 14.
A parallel circuit configuration exhibits which of the following characteristics?
- A.
Each component drops a different amount of voltage depending on its resistance
- B.
Each component has a different amount of current running through it unless all the resistive values are identical
- C.
The total resistance will always be larger than the largest individual resistance
- D.
All of the above
Correct Answer
B. Each component has a different amount of current running through it unless all the resistive values are identical -
- 15.
If a 100 resistor suddenly became open in series circuit, what would happen to the current?
- A.
It would become maximum value
- B.
It would become zero
- C.
It would stay the same
- D.
It would decrease only slightly
Correct Answer
B. It would become zero -
- 16.
A 10 watt light bulb has 0.5 amps for current running through it. What is the voltage?
- A.
2v
- B.
5v
- C.
20v
- D.
50v
Correct Answer
C. 20v -
- 17.
A digital multi meter (DMM) is used to measured what?
- A.
Voltage
- B.
Current
- C.
Resistance
- D.
All of the above
Correct Answer
D. All of the above -
- 18.
Dielectric strength of a Generator winding is tested using
- A.
Ammeter
- B.
Digital Multi-Meter
- C.
Insulation resistance meter
- D.
Torque Wrench
Correct Answer
C. Insulation resistance meter -
- 19.
The RPM of an AC generator, based on the number of windings, determines what parameter of that generator?
- A.
Voltage output
- B.
Frequency
- C.
Current output
- D.
VARs
Correct Answer
B. Frequency -
- 20.
Which meter(s) would be used to measure phase sequencing?
- A.
2 watt meters
- B.
Phase rotation meter
- C.
Clamp-on ammeter
- D.
2 voltmeters
Correct Answer
B. Phase rotation meter -
- 21.
When testing a diode using a DVOM in the diode test mode, what would indicate a good diode?
- A.
Positive lead closest to the stripe, negative lead on the opposite end yields 0.5v
- B.
Negative lead closest to the stripe, positive lead on the opposite end yields 0.5v
- C.
Positive lead closest to the stripe, negative lead on the opposite end yields an open
- D.
B&C answers must be true or the test is incomplete
Correct Answer
D. B&C answers must be true or the test is incomplete -
- 22.
In a 208v system, using a clamp-on ammeter, you record A phase=57a, B phase=68a, and C phase=59a. If the power factor is .92, calculate KW,
- A.
20KW
- B.
13KW
- C.
60KW
- D.
5KW
Correct Answer
A. 20KW -
- 23.
Which of the following is the color code of phase wiring on a 480v, 3phase system for ABC rotation?
- A.
Yellow, orange, brown
- B.
Red, white, blue
- C.
Black, red, blue
- D.
Brown, orange, yellow
Correct Answer
D. Brown, orange, yellow -
- 24.
The following symbol is a _________ and the vertical line represents the _______
- A.
Resistor, value
- B.
Transistor, base
- C.
Diode, anode
- D.
Diode, cathode
Correct Answer
D. Diode, cathode -
- 25.
In the following symbol , to which terminal is the AC connected?
- A.
1 and 3
- B.
4 and 2
- C.
1 and 2
- D.
3 and 4
Correct Answer
C. 1 and 2 -
- 26.
Which of the following wires has the greatest cross-sectional area?
- A.
0 AWG
- B.
00 AWG
- C.
4 AWG
- D.
20 AWG
Correct Answer
B. 00 AWG -
- 27.
When referring to a shielded cable, which is NOT a correct statement about terminating that shield
- A.
Terminate one end only
- B.
Terminate to ground
- C.
Terminate both ends to ground
- D.
Shields should never be left un-terminated
Correct Answer
C. Terminate both ends to ground -
- 28.
Which type of transformer must always be shunted prior to performing maintenance operations on them?
- A.
Potential transformers
- B.
Current transformers
- C.
Auto transformers
- D.
Isolation transformers
Correct Answer
B. Current transformers -
- 29.
Fuses should NEVER be installed
- A.
In series with the load
- B.
In series with the neutral
- C.
So they will protect the circuit before other safety devices
- D.
So they can be easily removed and replace after failure
Correct Answer
B. In series with the neutral -
- 30.
Which of the following is not used to limit current in a circuit?
- A.
Fuse
- B.
Ratchet, pivot, pawl
- C.
Silicon Controlled Rectifier (SCR)
- D.
Magnetic Circuit Breaker
Correct Answer
C. Silicon Controlled Rectifier (SCR) -
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Current Version
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Mar 17, 2022Quiz Edited by
ProProfs Editorial Team -
Jul 27, 2012Quiz Created by
Satof13
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