1. Which wave has the least value of form factor?
(A) Square wave.
(B) Rectangular wave.
(C) Sine wave.
(D) Triangular wave.
Answer ⇓
2. Which of the following is most sensitive galvanometer?
(A) Double galvanometer.
(B) Spot ballistic galvanometer.
(C) Elastic galvanometer.
(D) Vibration galvanometer.
Answer ⇓
3. Schering bridge is used to measure
(A) capacitance.
(B) frequency.
(C) resistance.
(D) inductance.
Answer ⇓
4. For handling greater currents induction wattmeters are used in conjunction with
(A) potential transformers. .
(B) current transformers.
(C) power transformers.
(D) none of the above.
Answer ⇓
5. A Weston frequency meter is
(A) moving coil instrument.
(B) moving iron instrument.
(C) dynamometer instrument.
(D) none of the above.
Answer ⇓
6. A Weston synchronoscope is a
(A) moving coil instrument.
(B) moving iron instrument.
(C) dynamometer instrument.
(D) none of the above.
Answer ⇓
7. In a Weston synchronoscope, the fixed coils are connected across
(A) bus-bars.
(B) incoming alternator.
(C) a load.
(D) transmission line.
Answer ⇓
8. In Weston synchronoscope, the moving coil is connected across
(A) field winding.
(B) bus-bars.
(C) incoming alternator.
(D) fixed coils.
Answer ⇓
9. In a low power factor wattmeter the pressure coil is connected
(A) to the supply side of the current coil.
(B) to the load side of the current coil.
(C) in any of the two meters at connection.
(D) none of the above.
Answer ⇓
10. In a low power factor wattmeter the compensating coil is connected
(A) in series with current coil.
(B) in parallel with current coil.
(C) in series with pressure coil.
(D) in parallel with pressure coil.
Answer ⇓
11. The chemical effect of current is used in
(A) D.C. ammeter hour meter.
(B) D.C. ammeter.
(C) D.C. energy meter.
(D) none of the above.
Answer ⇓
12. Which of the following damping is mostly provided in electrical instruments?
(A) fluid friction.
(B) spring.
(C) eddy current.
(D) all of the above.
Answer ⇓
13. A Dynamometer type wattmeter responds to the
(A) Average value of the active power.
(B) Average value of the reactive power.
(C) Peak value of the active power.
(D) Peak value of the reactive power.
Answer ⇓
14. In a meggar controlling torque is provided by
(A) spring.
(B) gravity.
(C) coil.
(D) eddy current.
Answer ⇓
15. Campbell’s bridge method is used to measure
(A) Copper loss.
(B) iron loss.
(C) Both iron and copper loss.
(D) None of the above.
Answer ⇓
16. Time of response of an indicating instrument is decides by the
(A) deflecting system.
(B) controlling system.
(C) damping system.
(D) current flow.
Answer ⇓
17. Which of the following ammeter is preferred to measure high frequency currents?
(A) moving iron.
(B) moving coil.
(C) dynamo meter.
(D) thermocouple.
Answer ⇓
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