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Measurement and Instrumentation

Measurement and Instrumentation
What is the name of physical quantities which are independent of each other?

 Fundamental quantity
None of these
 Derived quantity
 Numerical quantity

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Measurement and Instrumentation
A bridge circuit is shown in the figure below. Which one of the sentence given below is most suitable for balancing the bridge?

 First adjust R4 and then adjust R2.
 First adjust R2 and then adjust R3.
 First adjust R4 and then adjust R1.
 First adjust R2 and then adjust R4.

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Measurement and Instrumentation
The thermocouple instruments do not have

Absence of frequency error
Independence of ambient temperature
High sensitivity
High degree of measuring accuracy

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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

 3750 rev/KWh.
 960 rev/KWh.
 1000 rev/KWh.
 3600 rev/KWh.

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Measurement and Instrumentation
A variable w is related to three other variables x, y and z as w = xy/z. The variables are measured with meters of accuracy ± 0.5% reading, ± 1% of full scale value and ± 1.5% reading. The actual readings of the three meters are 80, 20 and 50 with 100 being the full scale value for all three. The maximum uncertainty in the measurement of w will be

 ± 7%
 ± 6%
 ± 5%
 ± 8%

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Measurement and Instrumentation
A CRO can display

Both AC and DC signals
AC signals
Time invariant signals
DC signals

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