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Measurement and Instrumentation
A metal strain gauge has a gauge factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of 10-5, the value of change of resistance in response to the strain is
0.0012 Ohm.
120 Ohm.
0.0024 Ohm.
240 Ohm.
0.0012 Ohm.
120 Ohm.
0.0024 Ohm.
240 Ohm.
Answer
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Related Question
Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.
Both A and R are true and R is not correct explanation of A.
Both A and R are true and R is correct explanation of A.
A is false and R is ture.
A is ture and R is false.
Both A and R are true and R is not correct explanation of A.
Both A and R are true and R is correct explanation of A.
A is false and R is ture.
A is ture and R is false.
Answer
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Measurement and Instrumentation
A 150 V moving iron voltmeter of accuracy class 1-0 reads 75 V when used in a circuit under standard condition. The maximum possible percentage error in the reading is
2.5%
1.5%
1%
2%
2.5%
1.5%
1%
2%
Answer
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Measurement and Instrumentation
The three resistors R1, R2 and R3 have the following ratings: R1 = 25Ω ± 4%, R2 = 65 Ω ± 4%; R3 =45 Ω ± 4%. If the resistance are connected in series, then limiting error produced in equivalent resistance is
2%
1%
3%
4%
2%
1%
3%
4%
Answer
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Measurement and Instrumentation
The measurement of a quantity
none of these.
is a comparison of an unknown quantity with another quantity.
is a comparison of an unknown quantity with standard.
is a comparison of an unknown quantity with known quantity.
none of these.
is a comparison of an unknown quantity with another quantity.
is a comparison of an unknown quantity with standard.
is a comparison of an unknown quantity with known quantity.
Answer
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Measurement and Instrumentation
The range of a moving iron ac ammeter is extended by
Changing number of turns of operating coil
None of the listed here
A shunt
A multiplier
Changing number of turns of operating coil
None of the listed here
A shunt
A multiplier
Answer
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