ECE :: Measurements and Instrumentation
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Two voltmeters 0-250 V each having resistances of 5 kΩ and 10 kΩ respectively and are connected in series. To ensure that neither of them goes beyond scale the total voltage which can be applied should be less than
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A 24 mm long conductor has a resistance of 128 Ω. The change in resistance is 13.3 Ω and change in length is 1.6 mm under tension. The gauge factor is
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Measuring of unknown voltage with a dc potentiometer loses its advantage of open circuit measurement when
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In a digital measuring device the input electrical signal is in the frequency range of dc to ac (50) Hz. It must be sampled at a rate of
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A meter has a square law scale. For 2 A current the deflection in 90°. For a deflection of 45°, the current is
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Consider the following Statements regarding resistance strain gauge
- The gauge factor is in the range of 2 to 5.
- The resistance changes due to change in specific resistance with strain.
- The resistance increases with increase in temperature.
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PCM employing 4 bit code is used to send data having frequency range from 0 to 2 kHz. The minimum required bandwidth of carrier channel is
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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 reverse direction. The reading on hot wire ammeter will be
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When a capacitor is connected to the terminals of an ohmmeter, the pointer indicated a low resistance initially and finally come to infinity position. This shows that capacitor is
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If eddy current damping is to be used, the disc of instrument should be
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or V = 375 V.
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