Q. The power input and output in a device are 3650 W and 3385 W with each reading in doubt by ± 10 W. The percentage uncertainty in losses is

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Q. A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be

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Q. Which of these has a magnetic brake?

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Q. Two numbers are 131 ± 5 and 629 ± 3. The sum of the numbers with range of doubt is

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Q. Assertion (A): Schering bridge is a low voltage bridge.

Reason (R): Schering bridge is very commonly used for measurement of capacitance.

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Q. Electrostatic voltmeter is suitable only for low voltages.

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Q. An accelerometer has a seismic mass of 0.05 kg and spring constant of 3 x 10⁵ N/m. If maximum displacement of mass is ± 1 mm, the maximum acceleration which can be measured is

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Q. If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms

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Q. A moving iron voltmeter reads 250 V when connected to 250 V dc. If connected to 250 V 50 Hz, the voltmeter reading is likely to be

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Q. A single element strain gauge bridge has two fixed resistances R1 and R1 of 120 Ω each and a variable resistance which gives full deflection at 120 Ω for zero strain and 120.6 Ω for straine e. If gauge factor is 2, strain e is

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Q. If eddy current damping is to be used, the disc of instrument should be

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Q. The scale of moving iron instrument is linear.

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Q. With a variable reluctance tachometer having 60 rotor teeth the count reads 3600 counts per minute. The speed in RPM is

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Q. When measuring phase angle between two waves using a CRO, the time base generator is connected to

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Q. It is required that a strain gauge has gauge factor of 100. The proper strain gauge is

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Q. LVDT is a

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Q. A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is

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Q. In Schering bridge, the potential of detector above earth potential is about

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Q. Which of the following instruments has non-linear scale?

1. Moving coil instrument
2. Moving iron instrument
3. Electrostatic instrument
4. Rectifier instrument

Select the answer as per following codes

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Q. Kelvin's double bridge is used to measure low resistances because

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