Q. In an ac coordinate potentiometer, the currents inphase and quadrature potentiometer are adjusted to be

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Q. Both X and Y plates of a CRO are excited by ac signals. The display is an ellipse which makes one rotation in 5 seconds. This means that

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Q. In order to achieve accuracy, the slide wire of a potentiometer should be

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Q. In measuring resistance using voltmeter and ammeter, the resistances of voltmeter and ammeter also affect the accuracy of measurement.

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Q. A permanent magnet moving coil measures

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Q. A CT is used to feed current coils of wattmeter, energy meter, power factor meter and an ammeter. Then

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Q. In measurements using strain gauge, the dummy strain gauge is used to

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Q. In an ac single phase energy meter, the potential coil is put on

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Q. The chemical effect of current is used in

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Q. The switch board instruments

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Q. Radiation pyrometer is used to measure temperature in the range of

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Q. The electromagnets of an induction wattmeter

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Q. In a vibrating reed frequency meter the natural frequency of two adjacent reeds have a difference of

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Q. In a CRO, the time base signal is applied to

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Q. Schering bridge operates at a high voltage of about 10 kV.

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Q. Which of these instrument does not have a control spring?

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Q. In Weston frequency meter, the magnetic axes of the two fixed coils are

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Q. Which one of the following is true?

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Q. A single phase energy meter operates on induction principle.

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Q. The accuracy of measurement using CRO is about

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