C:-400
D:-1250
Correct Answer:- Option-A
Question29:-The induced emf in the armature conductors of a DC motor is
A:-Sinusoidal
B:-Trapezoidal
C:-Rectangular
D:-DC
Correct Answer:- Option-A

Question30:-A 4 pole wave wound armature of a DC generator has 720 conductors and is rotated at 1000 RPM. If the useful
flux is 20 m Wb. Calculate the generated voltage

A:-240 V
B:-480 V
C:-960 V
D:-None of the above
Correct Answer:- Option-B
Question31:-The pointer of an indicating instrument is in the final deflected position, when
A:-The deflecting torque is zero
B:-The controlling torque is zero
C:-The damping torque is zero
D:-Both deflecting and controlling torques are zero
Correct Answer:- Option-C
Question32:-PMMC instrument can be used for
A:-AC only
-Both AC and DC
C:-DC only
D:-None of the above
Correct Answer:- Option-C
Question33:-The Watt hour meter is instrument.
A:-An integrating
B:-An indicating
C:-A recording
D:-A transfer
Correct Answer:- Option-A
Question34:-In a household single phase induction type energy meter, the meter can be reversed by
A:-Reversing the supply terminals
B:-Reversing the load terminals
C:-Opening the meter connections and reversing either the potential coil terminals or current coil terminals
D:-Opening the meter and reversing connections of both current and potential coil circuits
Correct Answer:- Option-C
Question35:-A voltmeter has resistance of 20000 when it is connected across a DC circuit and its power consumption is 2
mW. Suppose this voltmeter is replaced by voltmeter of 40000 resistance in the circuit, the power consumption will be
A:-4 mW
B:-2 mw
:-1 mW
D:-0.5 mW
Correct Answer:- Option-C
Question36:-The power in a three phase circuit is measured using two watt meter method. The reading of one of the watt

meters is positive and that of the other is negative. The magnitude of the reading is different. It can be concluded that the
power factor of the circuit is

A:-Unity
B:-Zero (lagging)
C:-0.5 (lagging)
D:-Less than 0.5 (lagging)
Correct Answer:- Option-D
Question37:-Creeping in a single phase induction type energy meter may be due to
A:-Overcompensation for friction
B:-Overvoltage
C:-Vibration
D:-All of the above