Differences between C.T. and P.T.

Electrical Measurements

This set of Electrical Measurements Questions and Answers for Entrance exams focuses on “Differences between C.T. and P.T. “.

1. Potential transformers are used to measure _________
a) high voltages
b) low voltages
c) high currents
d) low currents

2. Potential transformers are used with _________
a) high range voltmeter
b) low range voltmeter
c) intermediate range voltmeter
d) very high range voltmeter

3. Potential transformer is similar in design to a _________
a) C.T.
b) Step up transformer
c) Power transformer
d) Step down transformer

4. The secondary winding of a P.T. is designed for _________
a) 220 V
b) 2.2 kV
c) 1.1 kV
d) 110 V

5. The primary current in a C.T. is _________
a) independent of secondary circuit
b) dependent on the secondary circuit
c) depends on the transformation ratio
d) depends on the nominal ratio

6. The excitation current of a C.T. _________
a) varies over a fixed range of operation
b) varies over a wide range of normal operation
c) is fixed over a range of operation
d) is fixed always

7. Secondary of a P.T. can be open circuited.
a) True
b) False

8. When C.T. is connected in series with a line, a large voltage exists across the primary.
a) True
b) False

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