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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 2
41.
If eddy current damping is to be used, the disc of instrument should be
non-conducting and non-magnetic
conducting and magnetic
conducting and non-magnetic
non-conducting and magnetic
Answer: Option
Explanation:

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.

42.
The scale of moving iron instrument is linear.
True
False
Answer: Option
Explanation:

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

43.
With a variable reluctance tachometer having 60 rotor teeth the count reads 3600 counts per minute. The speed in RPM is
36
60
360
3600
Answer: Option
Explanation:

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

44.
When measuring phase angle between two waves using a CRO, the time base generator is connected to
X plate
Y plate
both X and Y plate
neither X nor Y plates
Answer: Option
Explanation:

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

45.
It is required that a strain gauge has gauge factor of 100. The proper strain gauge is
constantan strain gauge
nichrome strain gauge
semiconductor strain gauge
alloy strain gauge
Answer: Option
Explanation:

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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