Q. An ammeter is

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Q. It is required to measure temperature in the range of 1300-1520°C. The most suitable thermocouple is

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Q. Assertion (A): When frequencies of signals fed to X and Y plates of CRO are multiples of each other, Lissajous pattern is displayed on screen.

Reason (R): In a CRO, the vertical deflection is proportional to voltage applied to Y plates.

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Q. In portable instruments, damping is provided by

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Q. The sensitivity of electromagnetic digital flow meter can be increased by increasing

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Q. The increase in intensity of trace in a CRO causes a change in

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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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