Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

Assertion (A): In two wattmeter method of 3 phase power measurement, one of the wattmeters would read negative if power factor of load is less than 0.5.

Reason (R): In two wattmeter method of 3 phase power measurement, both the wattmeters would show equal readings if power factor of load is unity.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true R is false
D:
A is false R is true
Answer: B
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If σ standard deviation, probable error
A:
σ
B:
± 1.19 σ
C:
± 0.6745 σ
D:
± 0.4125 σ
Answer: C
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The accuracy of an instrument is determined by
A:
closeness of indicated value to the actual value
B:
repeatability of measured value
C:
speed with which the reading approaches final value
D:
least value which can be measured
Answer: A
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In a CRO the Y plates are oriented
A:
horizontally
B:
vertically
C:
at an angle of 20° of horizontal
D:
at an angle of 70° of horizontal
Answer: A
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Schering bridge is used to measure
A:
capacitance and dielectric loss
B:
inductance
C:
resistance
D:
mutual inductance
Answer: A
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