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Measurement and Instrumentation

Measurement and Instrumentation
One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?

0.65
0.84
1
0.73

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Measurement and Instrumentation
A 50 Hz bar primary CT has a secondary with 500 turns. The secondary supplies 5 A current into a purely resistive burden of 1Ω. The magnetizing ampere-turn is 200. The phase angle between the primary and secondary current is

 85.4o.
 94.6o.
 175.4o.
  4.6o.

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Measurement and Instrumentation
In a single phase energy meter, braking torque is provided by

None of the listed here
Air friction
Fluid friction
Permanent magnet

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Measurement and Instrumentation
If two meters X and Y require 40 mA and 50 mA respectively, to give full scale deflection, then

 X is more sensitive.
 It would not be possible to assess the sensitivity on the basis of the given data.
 Both X and Y are equally sensitive.
 Y is more sensitive.

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Measurement and Instrumentation
In induction type ammeter, _____ damping is provided.

None of the listed here
Air friction
Fluid friction
Eaddy current

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Measurement and Instrumentation
Purely mechanical instrument cannot be used for dynamic measurements because they have

 higher response time.
All of these
 large time constant.
 high inertia.

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