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Measurement and Instrumentation
A DC A-h meter is rated for 15 A, 250 V. The meter constant is 14.4 A-sec/rev. The meter constant at rated voltage may be expressed as
960 rev/KWh.
1000 rev/KWh.
3600 rev/KWh.
3750 rev/KWh.
960 rev/KWh.
1000 rev/KWh.
3600 rev/KWh.
3750 rev/KWh.
Answer
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Related Question
Measurement and Instrumentation
A PMMC instrument can be used as flux meter
By making control springs of large moment of inertia
By using a low resistance shunt
By eliminating the control springs
By using a high series resistance
By making control springs of large moment of inertia
By using a low resistance shunt
By eliminating the control springs
By using a high series resistance
Answer
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Measurement and Instrumentation
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,
2 represents greater precision but 1 and 3 represent same precision.
2 and 3 represent greater precision than 1.
1 represents greater precision than 2 and 3.
1, 2 and 3 represent same precision.
2 represents greater precision but 1 and 3 represent same precision.
2 and 3 represent greater precision than 1.
1 represents greater precision than 2 and 3.
1, 2 and 3 represent same precision.
Answer
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Measurement and Instrumentation
The resistance of a circuit is measured from the relation R= P/I2, where P is the power fed into the circuit and I is the current flowing through it. If the limiting errors in the measurement of power and current are respectively ± 1.0% and ± 1.0%, then what will be the limiting error in measurement of resistance ?
± 1.5%
±3.5%
± 3.0%
±0.5%
± 1.5%
±3.5%
± 3.0%
±0.5%
Answer
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Measurement and Instrumentation
Electrostatic instruments are normally used for
High current measurements
Low current measurements
High voltage measurements
Low voltage measurements
High current measurements
Low current measurements
High voltage measurements
Low voltage measurements
Answer
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Measurement and Instrumentation
A resistance is measured by the voltmeter-ammeter method employing dc excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter reading are subject to maximum possible errors of ± 2.4 % and ± 1.0 % respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is nearly
± 2.4%
± 3.4%
± 1%
± 1.4%
± 2.4%
± 3.4%
± 1%
± 1.4%
Answer
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