Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

If temperature increases by about 50°, the resistance of thermistor changes to
A:
half of its initial value
B:
twice of its initial value
C:
eight times of its initial value
D:
one eight of its initial value
Answer: D
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A permanent magnet moving coil meter can be used as
A:
ac only
B:
dc only
C:
both ac and dc
D:
low frequency ac and dc
Answer: D
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In a hot wire instrument, the deflection is proportional to
A:
peak value of ac current
B:
average value of ac current
C:
rms value of ac current
D:
either (a) or (b)
Answer: A
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The resistance of voltmeter affects the accuracy of measurement in loss of charge method.
A:
True
B:
False
C:
D:
Answer: A
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Minute cracks in metals and minute faults in welded joints can be detected using
A:
IR rays
B:
UV rays
C:
a rays
D:
X-ray/γ-rays
Answer: D
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