Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

It is required that a strain gauge has gauge factor of 100. The proper strain gauge is
A:
constantan strain gauge
B:
nichrome strain gauge
C:
semiconductor strain gauge
D:
alloy strain gauge
Answer: C

Only semiconductor strain gauge can have a gauge factor of 100. For all other strain gauges, gauge factor is about 2 only.

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When measuring phase angle between two waves using a CRO, the time base generator is connected to
A:
X plate
B:
Y plate
C:
both X and Y plate
D:
neither X nor Y plates
Answer: D

Time base signal is not connected. The two waves are fed to X and Y plates respectively.

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With a variable reluctance tachometer having 60 rotor teeth the count reads 3600 counts per minute. The speed in RPM is
A:
36
B:
60
C:
360
D:
3600
Answer: B

If speed is 60, the counter will count 60 x 60 = 3600 counts/per minute.

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The scale of moving iron instrument is linear.
A:
True
B:
False
C:
D:
Answer: B

Since reading is proportional to I2, the scale is non-linear.

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If eddy current damping is to be used, the disc of instrument should be
A:
non-conducting and non-magnetic
B:
conducting and magnetic
C:
conducting and non-magnetic
D:
non-conducting and magnetic
Answer: C

Disc must be conducting otherwise eddy currents can not flow. It must be non-magnet, i.e., so that it does not affect the measurement.

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