Q. If σ is standard deviation, variation is

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Q. An average responding voltmeter using full wave rectifier has been calibrated to read 1 V for 1 V rms sinusoidal input. For 1 V peak to peak square wave input, the meter reading will be

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Q. For critical damping, the resistance in D'Arsonval galvanometer circuit should be equal to

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Q. In figure, the reading of wattmeter will be proportional

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Q. Figure shows the equivalent circuit of resistor. The resistor is non-inductive when

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Q. The damping ratio, in D'Arsonval galvanometer is equal to

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Q. If φsh is flux of shunt magnet, φse is flux of series magnet, ish is eddy current due to φse, the torque in an induction wattmeter is proportional to

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Q. If Eb is the potential of accelerating anode, the energy of electrons as they emerge from electron gun is proportional to

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Q. The circuit of figure is used to measure the value Rx. Ammeter resistance Ra = 0.1 Ω voltmeter resistance Rv = 5000 Ω. It Rx1 and Rx2, are the measured values of Rx with switch in position 1 and 2, the mean of Rx1, and Rx2, is

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Q. If d1, d2, ..., dn are n individual deviations, the standard deviation is

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Q. In figure the values of Rx and Cx are

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Q. If J is moment of Inertia, D is damping constant, C is spring constant, G is displacement constant and I is current throught the coil of DArsonval galvanometer, the equation of motion is

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Q. A meter with a resistance of 100 Ω and a full scale deflection of current of 1 mA is to be converted into voltmeter of 0 - 5 V range. The multiplier resistance should be

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Q. In a resistance strain gauge, G = 2, stress = 1050 kg/cm², R = 1000 Ω. The value of ΔR will be

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Q. The household energy meter is

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Q. A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is

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Q. A dynamometer wattmeter is connected in ac circuit. The measured power is

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Q. Loss of charge method is suitable for medium resistances.

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Q. In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative

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Q. It is required to measure angular position. Out of the transducers

1.Circular potentiometer
2. LVDT
3. E pick up
4. Synchro

The proper devices are

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