Practice Test: Question Set - 03
1. It is required to measure the true open circuit e.m.f. of a battery. The best device is
- (A) D.C. voltmeter
- (B) Ammeter and a known resistance
- (C) D.C. potentiometer
- (D) None of the above
2. In order to achieve high accuracy, the slide wire of a potentiometer should be
- (A) As long as possible
- (B) As short as possible
- (C) Neither too small not too large
- (D) Very thick
3. For measurement of mutual inductance we can use
- (A) Anderson bridge
- (B) Maxwell's bridge
- (C) Heaviside bridge
- (D) Any of the above
4. A power factor meter has
- (A) One current circuit and two pressure circuits
- (B) One current circuit and one pressure circuit
- (C) Two current circuits and one pressure circuit
- (D) None of the above
5. In Weston synchronoscope the moving coil is connected across
- (A) Bus-bars
- (B) Incoming alternator
- (C) Fixed coils
- (D) Any of the above
6. Operating torques in analogue instruments are
- (A) Deflecting and control
- (B) Deflecting and damping
- (C) Deflecting, control and damping
- (D) Vibration and balancing
7. A sensitive galvanometer produces large deflection for a
- (A) Small value of current
- (B) Large value of current
- (C) Large value of power
- (D) Large value of voltage
8. In an energy meter braking torque is produced to
- (A) Safe guard it against creep
- (B) Brake the instrument
- (C) Bring energy meter to stand still
- (D) Maintain steady speed and equal to driving torque
9. The principle on which vector voltmeter is based is
- (A) That it works on the principle of complex
variation
- (B) That it measures the response of linear ramp
voltage
- (C) Same as digital meter
- (D) That it measures the amplitude of a single at two
points and at the same time measures their phase difference
10. Commonly used instruments in power system measurement are
- (A) Induction
- (B) Moving coil or iron
- (C) Rectifier
- (D) Electrostatic
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