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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 2
6.
Electrostatic voltmeter is suitable only for low voltages.
True
False
Answer: Option
Explanation:

It is suitable for high voltage.

7.
An accelerometer has a seismic mass of 0.05 kg and spring constant of 3 x 105 N/m. If maximum displacement of mass is ± 1 mm, the maximum acceleration which can be measured is
30 m/s2
60 m/s2
90 m/s2
120 m/s2
Answer: Option
Explanation:

0.05 x a = 3 x 103 x 10-3 or a = 60 m/s2.

8.
If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms
the bridge cannot be balanced
the bridge can be balanced
the bridge is balanced for some specified value of frequency
the bridge is balanced for some specific values of R1, R2, R3
Answer: Option
Explanation:

To balance the bridge both magnitudes and phase angles of voltages have to be balanced.

9.
A moving iron voltmeter reads 250 V when connected to 250 V dc. If connected to 250 V 50 Hz, the voltmeter reading is likely to be
250 V
252 V
248 V
210 V
Answer: Option
Explanation:

The inductance of coil will allow slightly less ac current. Hence reading slightly less.

10.
A single element strain gauge bridge has two fixed resistances R1 and R1 of 120 Ω each and a variable resistance which gives full deflection at 120 Ω for zero strain and 120.6 Ω for straine e. If gauge factor is 2, strain e is
0.0025
0.0035
0.005
0.0075
Answer: Option
Explanation:

.

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