Miscellaneous Indicating Instruments - Multiple Choice Questions and Answer

Miscellaneous Indicating Instruments - Multiple Choice Questions and Answer Points : miscellaneous indicating instruments, electrical, mcqs, evaluation, objective type question and answer, multiple choice questions and answer 1. Three fixed coils R, Y and B of moving iron power factor meter are mutually with the axis at
(a) 180°
(b) 120°
(c) 90°
(d) both (b) & (c)

2. When three fixed coils of moving iron power factor meter are connected to 3-phase supply, the flux produced is...
(a) Rotating
(b) Stationary
(c) Synchronously rotating
(d) AU of above

3. Eiectrodynamic type power factor meters introduce errors due to...
(a) Eddy current
(b) Flux
(c) Hysteresis
(d) Both (a) & (b)

4. Vibrating reed frequency meter uses the phenomenon of.
(a) Electrical resonance
(b) Mechanical resonance
(c) Series resonance
(d) Parallel resonance

5. The metallic reeds of reed type frequency meter are about...
(a) 4 mm wide & 5mm thick
(b) 5mm wide & 4mm thick
(c) 4mm wide & 0.5mm thick
(d) 0.4mm wide & 0.5mm thick

6. In case of Electrical Resonance frequency meter when X_L = X_C in the moving coil circuit, the phase angle will be.
(a) Zero
(b) 90°
(c) 180°
(d) 120°

7. Weston Frequency Meter operates on the principle of variation of.
(a) Resistance with variation in supply
(b) Impedance with variation in supply frequency
(c) X_L with variation in X_C
(d) All of above

8. In Weston frequency meter the scale can be extended over....
(a) 360°
(b) 90°
(c) 300°
(d) 180°

9. In Digital Frequency meter the speed of counter is.
(a) Very slow
(b) Fast
(c) Extremely fast
(d) Both (a) & (b)

10. Suppose “if’ is the frequency of the unknown signal and “N” the number of counts displayed by counter in “t” time interval between start & stop of gate. Thus the frequency of unknown signal is....
(a) f = t/N
(b) f = N/t
(c) f = N.t
(d) Both (b) & (c)

11. In S.I units the illumination of a surface is measured in....
(a) Lumens per square meter
(b) Lux
(c) Meter candle
(d) All of above

12. lumens per foot square is the unit of illumination in...
(a) British system
(b) M.K.S. system
(c) S.I. system
(d) Both (a) & (c)

13. Flicker photometers are employed when the two sources giving light of.
(a) Same colours to be compared
(b) Different colours to be compared
(c) Green colours to be compared
(d) Both (a) & (b)

14. At the time of synchronism the position of pointer of synchroscope is...
(a) It moves in clockwise direction
(b) It moves in anticlockwise direction
(c) Remains stationary on zero
(d) All of above

15. Common type of synchroscope is..,.
(a) Moving iron type
(b) Electrodynamorneter type
(c) D.C. type
(d) Both (b)&(c)

16. In electrical speedometer, it is the measure of speed....
(a) Current
(b) Voltage
(c) Flux
(d) Resistance

17. Photo-electric tachometer is the type of...
(a) Mechanical tachometer
(b) Electrical tachometer
(c) Electronic tachometer
(d) Electrostatic tachometer