C:-0.866 lag
D:-0.8 lag
Correct Answer:- Option-C
Question85:-Assertion (A) : It is always desirable to take the reading of an
indicating instrument very close to the full scale reading
೧೮೩5೦೧ (ಗಿ) : Accuracy of an indicating instrument is maximum at the full scale
deflection and error increases as reading comes closer to the beginning of the scale
A:-A is true but R is false
B:-A is false but R is true
C:-Both A and R are true and R is the correct explanation of A
D:-Both A and R are true but R is NOT the correct explanation of A
Correct Answer:- Option-C

Question86:-The coil of a moving iron instrument has a resistance of 500 ohm and
inductance of 1H. It reads 200 V when a 200 V DC is applied. It series resistance is
1000 ohms its reading when fed by 200 V, 50 Hz AC will almost be

A:-196 V
B:-192 ४
C:-202 V
D:-204 V
Correct Answer:- Option-A
Question87:-Assertion (A) : A low power factor wattmeter has special
constructional features to ensure accurate measurement
Reason (R) : Extension of wattmeter range in DC circuit can be easily done by
using current and potential transformer
A:-A is true but R is false
B:-A is false but R is true
C:-Both A and R are true and R is the correct explanation of A
D:-Both A and R are true but R is not the correct explanation of A
Correct Answer:- Option-A

Question88:-To the 'y' input of a CRO a signal defined by 10sin(100t) is applied. To
the 'x' input a signal 10cos(100t) is fed. The gain for both x-channel and y-channel
is the same. The screen shows

A:-sinusoidal waveform
B:-Circle

C:-Ellipse

D:-Straight line

Correct Answer:- Option-B

Question89:-The meter constant of a single phase 240V induction watt-hour meter