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Electrical Theory Assessment Questions

Electrical Theory Assessment

Possible Questions during Theoretical Assessment.

  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.

 

  1. 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




 

  1. 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

 

  1. 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.




 

  1. 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

 

  1. 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

 

  1. 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

 

  1. 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




 

  1. 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

 

Updated: June 11, 2018 — 2:16 pm

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