ECE :: Measurements and Instrumentation
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Assertion (A): Wien bridge can be used for measuring frequency.
Reason (R): A frequency meter for 50 Hz system has a frequency range of 40 to 60 Hz.
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Which of these has poor overload capacity?
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Which instrument is based on induction principle?
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In figure, the position of voltmeter and ammeter are exchanged. It may result in damage to
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The volt ratio box is basically a
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A sinusoidal ac voltage of amplitude 100 V is applied to a rectifying device which offers 10 Ω resistance in forward direction and infinite resistance in backward direction. A moving coil ammeter is also connected in the circuit. The reading of ammeter will be
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A variable reluctance tachometer has 180 teeth on rotor. The speed of shaft on which it is mounted in 1200 rpm. The frequency of output pulses is
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In the wheatstone bridge in figure, each resistance is increased by 0.05%. The value of v0 will be
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Consider the following operation in respect of Wheatstone bridge (Kb, denotes battery key, Kg denotes galvanometer key)
- open Kb
- close Kg
- close Kb
- open Kg
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