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