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Measurement and Instrumentation

Measurement and Instrumentation
_______ is used to measure the flow of air around aeroplane.

 nucleus.
 Venturimeter.
  Anemometer.
 Orifice.

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Measurement and Instrumentation
Two capacitance, C1 = 150 ± 2.4µF and C2 = 120 ± 1.5 µF are connected in parallel. What is the limiting error of the resultant capacitance C (in µF) ?

 0.9µF
 1.5µF
 2.4µF
 3.9µF

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

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Measurement and Instrumentation
The internal resistance of an ammeter should be

High
Infinity
Very small
Medium

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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

 4%
 1%
 2%
 3%

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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%
 ± 8%
 ± 6%
 ± 5%

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