Induction Type Instruments & Energy Measurement - Multiple Choice Questions and Answers

Induction Type Instruments & Energy Measurement - Multiple Choice Questions and Answers Points : Induction Type Instruments & Energy Measurement, MCQS, Objective type question, Multiple choice questions and answer 1. The deflecting torque in shaded-pole induction ammeter is proportional to...
(a) Current
(b) Square of current
(c) Square of voltage
(d) Both (b) & (c)

2. Damping torque in the case of shaded-pole induction ammeter is produced by...
(a) Eddy current
(b) Permanent magnet
(c) Both (a) & (b)
(d) Balance weight

3. The construction of induction voltmeter is similar to ammeter except for the difference that its winding is wound with a.
(a) Silver wire
(b) Large number of turns
(c) Fine wire
(d) Both (b) & (c)

4. The power consumption in induction type instructions is...
(a) Lon
(b) Fairly high
(c) Zero
(d) All of above

5. Frequency error in the induction type instruments can be compensated for by the use of a...
(a) Non-inductive shunt
(b) Inductor
(c) Capacitor
(d) Diode

6. Temperature error can be compensated in induction voltmeter by...
(a) Shunt
(b) Multiplier
(c) Shunt & swamping resistance
(d) Series resistance

7. Induction type energy meters are used to measure a.
(a) D.C. energy
(b) A.C. energy
(c) Capacitor energy
(d) All of above

8. The braking system of energy meter basically consists of a...
(a) Mechanical brake
(b) Plugging brake
(c) Regenerative brake
(d) Permanent magnet

9. To give the correct reading of energy meter on all power factor, the field set up by shunt magnet should lags behind by applied voltage by...
(a) Approximately 90°
(b) Exactly 90°
(c) 180°
(d) 120°

10. The disc of energy meter continues rotating when the potential coils are excited hut with no load current flowing, the defect is known as....
(a) Phase error
(h) Frequency error
(c) Creeping error
(d) Friction error

11. When energy measurements are made with high voltages an currents, the...
(a) C.T. is used
(b) P.T. is used
(c) Both (a)&(b)
(d) All of above

12. This is the only method used for testing direct current motor meters...
(a) Short period test with a wattmeter
(b) Short period test with a rotating substandard
(c) Long period dial test
(d) Stroboscopic test

13. Wright maximum demand indictor is the type of
(a) Bi-metallic instrument
(b) Thermal instrument
(c) Electrostatic instrument
(d) Electrodynamomerer instrument

14. The Wright maximum demand indictor gives the correct readings only when....
(a) Constant supply voltage
(b) Constant load power factor
(c) Constant load current
(d) Both (a) & (b).

15. The Merz-Price demand indicator is more expensive than the thermal type because it involves a
(a) Complex mechanism
(b) Simple mechanism
(c) PMMC instrument
(d) All of above