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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 5
26.
For use at 50 Hz the range of scale of vibrating reed frequency meter is
25 - 75 Hz
40 - 60 Hz
47 - 53 Hz
42 - 58 Hz
Answer: Option
Explanation:

Generally the frequency does not fall below 47 Hz and does not exceed 53 Hz.

27.
Consider the following statements about a moving iron instrument
  1. It is an unpolarised instrument.
  2. It has permanent magnet.
  3. It has a fixed coil.
  4. It has two iron vanes.
Of these statements
1, 2, 3 are correct
1, 2, 4 are correct
1, 3 and 4 are correct
2, 3, 4 are correct
Answer: Option
Explanation:

It does not have a permanent magnet.

28.
The two pressure coils in a single phase power factor meter of turns
the same dimension and the same numbers of turns
the same dimension but different number of turns
different dimension and different numbers of turns
different dimension but the same numbers of turns
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Piezoelectric effect can be used to measure
force
strain
acceleration
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
A current of 3.18 A is flowing through resistance of 35.68 Ω. The voltage drop across resistance to the appropriate number of significant figures is
113.4624 V
113.462 V
113.46 V
113 V
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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