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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 2
1.
Kelvin's double bridge is used to measure low resistances because
it has high sensitivity
there is no thermoelectric emf
resistance variation due to temperature
effect of contact and lead resistances is eliminated
Answer: Option
Explanation:

Effect of lead and contact resistances is very important in measurement of low resistances.

2.

Assertion (A): Shunt of an ammeter has a low resistance.

Reason (R): Shunt may be connected in series or in parallel with ammeter.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
Answer: Option
Explanation:

Shunt is always connected in parallel with ammeter.

3.
The scale of hot wire instrument is linear.
True
False
Answer: Option
Explanation:

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

4.
The D'Arsonval- movement can be converted into audio frequency ac ammeter by adding a
thermocouple
transducer
chopper
rectifier
Answer: Option
Explanation:

Rectifier converts ac to dc which is measured by D'Arsonval meter.

5.
The resistance of a 125 Ω strain gauge changes by 1 ohm for 4000 micro strain. The gauge factor is
1.5
2
2.5
3
Answer: Option
Explanation:

.

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