MEASUREMENT AND INSTRUMENTATION QUIZ

PMMC type instruments normally use

Fluid friction damping

Eddy current damping

None of these

Air friction damping

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The high torque to weight ratio in an analog indicating instrument indicates

none of these.

nothing related to friction loss.

low friction loss.

high friction loss.

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A PMMC voltmeter is connected across a series combination of a DC voltage source V1 = 2 V and an AC voltage source V2 = 3sin4t, the voltmeters reads

5 V.

2 V.

(2 + √3/2)V.

0 V.

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A wattmeter reads 30.34 W. The absolute error in the measurement is - 2.22 W. What is the true value of power?

None of these

32.56 W .

28.12 W.

25.45 W.

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A transducer measures a range of 0 – 200 N force with a resolution of 0.15 percent of full scale. What is the smallest change which can be measured by this transducer ?

3.33 N

0.3 N

6.66 N

0.15 N

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Relative error is same as

absolute error.

true error.

ratio of absolute error and true value.

None of these

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A CRO can display

DC signals

Both AC and DC signals

Time invariant signals

AC signals

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In an Anderson bridge, the unknown inductance is measured in terms of

Known capacitance and resistance

Known inductance

Known resistance

Known inductance and resistance

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Moving iron instruments have _____ scale.

Log

None of the listed here

Uniform

Squared

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The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Power proportional to 3 phase power if the load is balanced

Reactive power of R phase

Active power in R phase

Active power of Y phase

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