Q. A diode peak reading VTVM and thermocouple meter are connected across output of an amplitude modulated circuit. In the absence of modulation both meters read 10 V. When sinusoidal AM is applied, VTVM reads 15V The reading of thermocouple meter will be

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Q. The resistance of voltmeter affects the accuracy of measurement in loss of charge method.

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Q. In a hot wire instrument, the deflection is proportional to

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Q. A permanent magnet moving coil meter can be used as

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Q. If temperature increases by about 50°, the resistance of thermistor changes to

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Q. Which of the following draws minimum power from source?

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Q. The range of RTD using platinum is about

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Q. A digital voltmeter has a 4 1/2 digit display. The 1 V range can measure voltage up to

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Q. Consider the following statements as regards induction and dynamometer wattmeters

1. Dynamometer wattmeters can be used for dc only.
2. Induction wattmeter has higher torque and dynamometer wattmeter.
3. Induction wattmeter is less accurate, has more power consumption and more weight than dynamometer wattmeter.

Which of the above statements are correct?

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Q. A Maxwell's bridge has the unknown inductance in one arm and resistance in the other three arms.

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Q. For a current transformer, the standard secondary rating is

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Q. To avoid the effect of stray magnetic fields in ac bridge we can use

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Q. A resistance strain gauge is usually

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Q. Assertion (A): Secondary instruments require calibration at frequent intervals.

Reason (R): Secondary instruments have many errors.

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Q. In ac bridge measurements, 'Wagner ground' means

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Q. In a platinum RTD, the change in resistance for a temperature rise of 50° C is about

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Q. The gauge factor of a semiconductor strain gauge is about

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Q. Which of the following instruments is used almost exclusively to measure radio frequency currents?

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Q. 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

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Q. 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

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