EXAMIANS
The coil of a moving iron instrument has a resistance of 500 ohm and inductance of 1 H. It reads 250 V when a 250 V DC is applied. It series resistance is 2000 ohms its reading when fed by 250 V, 50 Hz AC will be
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A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be
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One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?
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For measurement of high direct voltage, one would use _____ voltmeter.
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A moving coil of a meter has 100 turns, and a length and depth of 10 mm and 20 mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carries a current of 50 mA. The torque on the coil is
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The moving coil-meters, damping is provided by
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The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?
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Which of the following devices may be used for extending the range of instruments?
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Which of the quantity consists of unit as kg m/sec ?
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The thermocouple instruments do not have
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