Measurement And Instrument Theory - 7 - MCQs with answers

Measurement And Instrument Theory - 7 - MCQs with answers

Q1. When a 100 V moving iron voltmeter is of accuracy class 1-0 is used in a circuit, it reads 50 V. Then the maximum possible percentage error in the reading is

A. 1 %
B. 2 %
C. 2.5 %
D. 3 %

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Q2. If the two voltage measurements are V1 = 150 ± 2% and V2 = 100 ± 4% respectively. Then the maximum percentage error in the sum of two voltage measurements is

A. ± 2.4 %
B. ± 2.6 %
C. ± 2.8 %
D. ± 3.4 %

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Q3. If the resistance in a circuit is given by 80Ω ± 0.2% and the current flowing through it is 5A ± 0.1%, then the uncertainty in the power will be

A. ± 0.2 %
B. ± 0.4 %
C. ± 0.6 %
D. ± 0.8 %

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Q4. While measuring resistance by the voltmeter-ammeter method, the maximum possible percentage error in the voltmeter and ammeter are ± 1.8% and ± 1.2% respectively. Then the maximum possible percentage error in the value of resistance will be

A. ± 3%
B. ± 4%
C. ± 4.2%
D. ± 4.8%

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Q5. In a Wheatstone bridge, the formula for finding unknown resistance (R₂) is given by

R₂ = R₂R₃/R₁

Where, R₁= 150Ω± 0.1%

R₂ = 250Ω ± 0.1%

R₃ = 300Ω ± 0.1%

The value of unknown resistance is

A. R₂ = 250Ω ± 0.1%
B. R₂ = 300Ω ± 0.3%
C. R₂ = 750Ω ± 0.3%
D. R₂ = 500Ω ± 0.3%

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Q6. What will be the limiting error of the resultant capacitance obtained by connecting two capacitance in parallel where C₁ = 250 ± 4μF and C₂ = 200 ± 3μF?

A. 3μF
B. 4μF
C. 7μF
D. 1.7μF

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Q7. The true power measured by the wattmeter whose range is 500 W and an error of ± 2% of full scale deflection is 150 W. The relative error while reading 150 W will be

A. ± 4%
B. ± 5.39%
C. ± 6.67%
D. ± 1.5%

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Q8. A voltmeter connected across an unknown resistance has scale of 0 to 150 V reads 50 V when the current flowing in the circuit is 1 mA. If sensitivity of the voltmeter is 15kΩ/V, then the percentage error due to loading effect is

A. ± 1.5%
B. ± 2.12%
C. ± 2.22%
D. ± 2.5%

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Q9. If R₁= 15Ω ± 2% and R₂= 20Ω ± 2% are the resistance connected in parallel then the value of the resistance for the parallel combination is

A. 8.57Ω± 2%
B. 8.57Ω± 4%
C. 8.57Ω± 3%
D. 8.57Ω± 2.5%

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