Electrical Measurement and Measuring Instruments (3160915) MCQs

MCQs of Measurement of Parameters

Showing 31 to 40 out of 63 Questions
1 2 3 4 5 6
31.

Ratio error is due to _________

(a)

iron loss
(b)

C.T.
(c)

magnetising component
(d)

supply voltage
Answer:

Option (a)

32.

Phase angle error is due to _________

(a)

C.T.
(b)

magnetising component
(c)

iron loss
(d)

supply voltage
Answer:

Option (b)

33.

Errors in a C.T. can be minimised by _________

(a)

making use of laminations
(b)

having low reactance
(c)

increasing the secondary winding turns
(d)

decreasing the primary winding turns
Answer:

Option (b)

34.

The secondary leakage reactance of a C.T. ____________

(a)

increases its ratio error
(b)

decreases its ratio error
(c)

has no effect on its ratio error
(d)

increases the impedance of the circuit
Answer:

Option (a)

35.

What is the effect of reducing the secondary turns in a C.T. by 1%?

(a)

transformation ratio reduces by the same value
(b)

no effect
(c)

nominal ratio increase by the same value
(d)

secondary current increases by the same value
Answer:

Option (a)

36.

In a 1000/5 A C.T., the number of secondary turns would be ________

(a)

200
(b)

199 or 198
(c)

5
(d)

1000
Answer:

Option (b)

37.

The secondary winding of a C.T. ____________

(a)

can be shorted
(b)

can’t be shorted
(c)

can be opened
(d)

can’t be opened
Answer:

Option (a)

38.

The secondary winding of a C.T. is opened when?

(a)

C.T. is magnetised
(b)

C.T. is demagnetised
(c)

C.T. is shorted
(d)

C.T. is opened
Answer:

Option (b)

39.

Potential transformers are used to measure _________

(a)

high voltages
(b)

low voltages
(c)

high currents
(d)

low currents
Answer:

Option (a)

40.

Potential transformers are used with _________

(a)

high range voltmeter
(b)

low range voltmeter
(c)

intermediate range voltmeter
(d)

very high range voltmeter
Answer:

Option (b)

Showing 31 to 40 out of 63 Questions
1 2 3 4 5 6