Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

Consider the following statements regarding electromagnetic flowmeter
  1. AC excitation is used to avoid polarisation of fluid.
  2. The meter calibration is changed as viscosity of fluid changes.
  3. Stainless steel pipes can be used for measuring the flow of liquid of high conductivity.
Of the above statements
A:
1, 2, 3 are correct
B:
1 and 2 are correct
C:
2 and 3 are correct
D:
1 and 3 are correct
Answer: D
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The coil of a DArsonval galvanometer has N turns. If flux density is B, current is I and area of coil is A, the deflecting torque is
A:
NBI/A
B:
NBIA
C:
NIA/B
D:
N2IAB
Answer: B
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Which of the following instruments is used almost exclusively to measure radio frequency currents?
A:
Moving coil
B:
Rectifier
C:
Moving iron
D:
Thermocouple
Answer: D
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In a platinum RTD, the change in resistance for a temperature rise of 50° C is about
A:
2%
B:
10%
C:
20%
D:
40%
Answer: C
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Assertion (A): Damping in a vibration galvanometer is small.

Reason (R): Vibration galvanometer is a PMMC instrument.

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: B
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