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Measurement and Instrumentation

Measurement and Instrumentation
Dynamic errors are caused by

 environmental error
 instrument not responding fast
 observational error
 human error

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Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Reactive power of R phase
Power proportional to 3 phase power if the load is balanced
Active power in R phase
Active power of Y phase

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Measurement and Instrumentation
Which meter is suitable for the measurement of 10mV at 50MHz?

VTVM
Moving coil voltmeter
Moving iron voltmeter
CRO

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Measurement and Instrumentation
To measure ac as well as dc power, we use

Sometimes induction and sometimes dynamometer wattmeter
None of the listed here
Dynamometer wattmeter
Induction wattmeter

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Measurement and Instrumentation
When testing a coil having a resistance of 10 ohms, resonance occurred when the oscillator frequency was 10 MHz and rotating capacitor was set at 500/2π pF. The effective value of the Q of the coil is

 25.4.
 31.4.
 20.
 54.2.

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Measurement and Instrumentation
With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be

500Hz
1kHz
50Hz
100Hz

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MORE MCQ ON Measurement and Instrumentation

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