Instrument Transformers

Electrical Measurements

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Instrument Transformers”.

1. What is the current transformer?
a) transformer used with an A.C. ammeter
b) transformer used with an D.C. ammeter
c) transformer used with an A.C. voltmeter
d) transformer used with an D.C. voltmeter

2. What is the potential transformer?
a) transformer used with an D.C. ammeter
b) transformer used with an A.C. voltmeter
c) transformer used with an D.C. ammeter
d) transformer used with an A.C. voltmeter

3. C.T. and P.T. are used for _________
a) measuring low current and voltages
b) measuring very low current and voltages
c) measuring high currentsand voltages
d) measuring intermediate currents and voltages

4. The primary winding of a C.T. has _________
a) a larger number of turns
b) no turns at all
c) intermediate number of turns
d) a few turns

5. The secondary winding of a C.T. has _________
a) a large number of turns
b) a few turns
c) no turns at all
d) intermediate number of turns

6. Turns ration for a C.T. is _________
a) n = Np ⁄ Ns
b) n = Ns ⁄ Np
c) n = 1 ⁄ Np
d) n = Ns

7. The primary winding of a P.T. has _________
a) intermediate number of turns
b) no turns at all
c) a larger number of turns
d) a few turns

8. The secondary winding of a P.T. has _________
a) a large number of turns
b) intermediate number of turns
c) no turns at all
d) a few turns

9. Turns ration for a C.T. is _________
a) n = Np ⁄ Ns
b) n = Ns ⁄ Np
c) n = 1 ⁄ Np
d) n = Ns

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