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Measurement and Instrumentation

Measurement and Instrumentation
A 10MHz CRO has

10MHz horizontal oscillator
10MHz supply frequency
5MHz sweep
10MHz vertical oscillator

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Measurement and Instrumentation
The terminals across the source are ______________________________ if a current source is to be neglected.

  replaced by a source resistance
 open circuited
  replaced by a capacitor
 short circuited

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Measurement and Instrumentation
A first order instrument is characterized by

 Time constant only
 Static sensitivity and damping coefficient
 Static sensitivity and time constant
 Static sensitivity, damping coefficient and natural frequency of oscillations

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Measurement and Instrumentation
The pressure coil of a wattmeter should be connected on the supply side of the current coil when

Supply voltage is low
Load impedance is low
None of these
Load impedance is high

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Measurement and Instrumentation
The dynamometer principle can be used for

 voltmeter only.
 ammeter only.
 ammeter, voltmeter and wattmeter.
 wattmeter only.

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Measurement and Instrumentation
A single phase load is connected between R and Y terminals of a 415 V, symmetrical, 3-phase, 4 wire system with phase sequence RYB. A wattmeter is connected in the system as shown in figure. The power factor of the load is 0.8 lagging. The wattmeter will read

 + 795 W.
 - 795 W.
  - 597 W.
 + 597 W.

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