Engineering Quiz: A Basic Electrical Theory Assessment Test
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- 1.Which of the following is not applicable to an AC system?
- A.
It can be transformed.
- B.
It develops eddy currents.
- C.
It can interfere with communications lines.
- D.
It is suitable for charging batteries.
- 2.If a transformer ratio is 20/1, then which of the following is true:
- A.
For every 20 turns in the primary, there is one turn in the secondary.
- B.
The primary voltage is 20 times greater than that of the secondary.
- C.
For every 20 rotations in the secondary, there is one rotation in the primary.
- D.
None of the above
- 3.If a motor enclosure is designed to contain sparks or flashes that could ignite surrounding vapors or gases, then the enclosure is considered to be which of the following:
- A.
Ventilated
- B.
Explosion proof
- C.
Explosion resistant
- D.
Fire proof
- 4.The output of a 3-phase transformer is measured in which of the following units:
- A.
Volts
- B.
Amperes
- C.
Volt-amps
- D.
Watts
- 5.In order to change the rotation of a DC series motor, which of the following must be done:
- A.
The motor must be converted to AC.
- B.
F1 and F2 must be reversed.
- C.
The capacitor leads must be reversed.
- D.
The frequency must be altered.
- 6.Bonding does which of the following:
- A.
Provides electrical continuity
- B.
Regulates the voltage
- C.
Controls the load on the system installation
- D.
All of the above
- 7.A meter used to measure both AC and DC voltage and current is known as which of the following:
- A.
An ohms meter
- B.
A multimeter
- C.
A resistance meter
- D.
None of the above
- 8.Which of the following materials is used on conduits inside and outside of a box:
- A.
Bushings
- B.
Couplings
- C.
Lock nuts
- D.
All of the above
- 9.If a transformer has a voltage step-down from 117 volts to 6 volts then the ratio of the transformer is equal to which of the following:
- A.
19, 5 :1
- B.
1 :19, 5
- C.
180 :1
- D.
3 :1
- 10.If the power factor of a circuit is increased, then which of the following occurs:
- A.
The active power is increased
- B.
The reactive power is decreased
- C.
Both of the above
- D.
None of the above
- 11.In a 3Ø circuit, how many electrical degrees separate each phase:
- A.
3
- B.
120
- C.
180
- D.
360
- 12.Ground fault protection for personnel on a 120 volt single-phase circuit is based on which of the following:
- A.
Ungrounded current between conductors
- B.
Unbalanced current between the grounded and ungrounded conductor
- C.
Overload in the current carrying conductor
- D.
Excessive voltage in the grounding conductor
- 13.Electrical appliances shall be installed in parallel in order to make the operation of each appliance in- dependent of the others.
- A.
True
- B.
False
- 14.In order to calculate watt hours, which of the following formulas must be used:
- A.
E x I x T²
- B.
Amps/Volts
- C.
E x I x T
- D.
24 /(E x I x T )
- 15.The peak value of AC voltage determines the breakdown voltage of insulation.
- A.
True
- B.
False
- 16.The efficiency of electrical equipment is determined by which of the following:
- A.
The amount of friction present
- B.
The motor speed divided by the input power
- C.
The power output divided by the input
- D.
None of the above
- 17.Inductance and capacitance are not considerations in a DC current for which of the following reasons:
- A.
DC supply has no frequency
- B.
DC supply carries power equally
- C.
Both of the above
- D.
None of the above
- 18.Two transmission wires create a corona when which of the following exists:
- A.
The wires have a high potential difference
- B.
The wires are installed overlapping or too close together
- C.
The wires are spaced too far apart
- D.
None of the above
- 19.Rearranging the control components in an electrical diagram in order to simplify tracing of a circuit is an example of a schematic diagram.
- A.
True
- B.
False
- 20.In a coil, the higher the level of self-inductance:
- A.
The lower the level of resistance will be
- B.
The longer the delay will be in establishing current through it
- C.
The greater the level of flux produced will be
- D.
None of the above
- 21.A negative charge will do which of the following: 1. I. Interact with negative charges 2. II. Interact with positive charges 3. III. Cause a short in a positive system
- A.
I & III
- B.
I & II
- C.
I only
- D.
All of the above
- 22.If a circuit breaker is installed vertically and the handle is flipped up, then the circuit breaker will be which of the following:
- A.
Off
- B.
Unable to operate properly
- C.
On
- D.
Locked in place
- 23.A dielectric electrical element is which of the following:
- A.
A capacitor
- B.
A grounding conductor
- C.
An insulator
- D.
None of the above
- 24.The electrical property of conductors that allows them to oppose the free flow of current traveling over them is measured in which of the following:
- A.
Amperes
- B.
Ohms
- C.
Volts
- D.
Watts
- 25.Two equally valued resistors in series have a total resistance of which of the following:
- A.
Twice as much as one of the resistors
- B.
The sum of one
- C.
The difference between each resistance
- D.
None of the above
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