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Measurement and Instrumentation

Measurement and Instrumentation
For the AC bridge circuit shown in figure at balance the value of Rd will be

 (Rb/Rc).Ra.
 (Rc/Ra).Rb.
 (Ra/Rc).Rb.
 (Rc/Rb).Ra.

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Measurement and Instrumentation
Ratio of readings of two wattmeter connected to measure power in a balanced 3-phase load is 5:3 and the load is inductive. The power factor at load is

 0.6 lag.
 0.917 lead.
 0.6 lead.
 0.917 lag.

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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

 31.4.
 20.
 54.2.
 25.4.

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Measurement and Instrumentation
Which one of the following meters has maximum loading effect on the circuit under measurement ?

 10 MΩ/volt
 100 Ω/volt
 1000 Ω/volt
 1 MΩ/volt

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Measurement and Instrumentation
The problem of Electrostatic coupling in a transformer is acute at

Power frequencies
High load on the transformer
High frequencies
Low frequencies

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Measurement and Instrumentation
On a simple ohmmeter, the 0 Ω mark is _______ of the scale.

Far right
In the middle
Far left
None of the listed here

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