Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

The deflection of a DArsonval galvanometer is measured through a mirror and scale. The mirror is 1 m away from the light source. The mirror is mounted on, the moving system. If mirror rotates through 0.2 rad the displacement on the scale is
A:
0.2 m
B:
0.4 m
C:
0.1 m
D:
0.05 m
Answer: B

Diplacement = (1) (2θ) = 0.4 m.

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Four voltmeters have following specifications. If accuracy is main consideration which is the best?
A:
100 V, 2 mA
B:
100 V, 100 mA
C:
100 V, 1 mA
D:
100 V, 0.1 mA
Answer: D

Since the current drawn is minimum, the accuracy is maximum.

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A wire strain gauge has a gauge factor of 2, resistance of 125 Ω and length 1 m. If length of wire changes by .005 m, change in resistance will be
A:
0.25 Ω
B:
0.5 Ω
C:
1.25 Ω
D:
2.5 Ω
Answer: C

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To avoid creep in an energy meter
A:
two shading bands are put on shunt magnet
B:
two shading bands are put on series magnet
C:
two holes are cut in the disc on opposite sides of spindle
D:
the potential coil is made of very thin wire
Answer: C

When a hole comes under a pole of upper electromagnet the disc becomes stationary. Thus creep is avoided.

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Wheatstone bridge is suitable for low resistances.
A:
True
B:
False
C:
D:
Answer: B

It is suitable for medium resistances.

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