Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance is
A:
0.001 Ω
B:
0.1001 Ω
C:
100 Ω
D:
1000 Ω
Answer: B

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If a shunt of 200 Ω resistance is used with a galvanometer of 1000 Ω resistance, the multiplying power is
A:
6
B:
5
C:
1/5
D:
1/6
Answer: A

If current through galvanometer is 1,

A current through shunt = . Total current = 6 I. Hence multiplying factor is 6.

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Assertion (A): Strain measurement using strain gauge invariably requires a dummy strain gauge.

Reason (R): The resistance of strain gauge depends on temperature.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true R is false
D:
A is false R is true
Answer: A

The dummy strain gauge compensates the error due to change in temperature because temperature affects both the active and dummy strain gauges equally.

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Which of the following instruments can be used for dc as well ac upto a few MHz?
  1. Moving iron instrument
  2. Thermocouple instrument
  3. Induction instrument
  4. Moving coil instrument
Select the correct answer as per following codes
A:
2 only
B:
2 and 3 only
C:
1, 2 and 3 only
D:
2 and 4 only
Answer: A

Thermocouple instrument is based on heating effect and can be used for very high frequencies also.

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A moving coil meter has 10 Ω resistance and requires 40 mA for full scale deflection. The shunt resistance required to convert it into 0-2 A ammeter is
A:
0.1021 Ω
B:
0.2041 Ω
C:
0.256 Ω
D:
0.4210 Ω
Answer: B

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