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MCQs 1: Accuracy of a measuring instrument indicates the

Closeness of the output reading to the true value Ratio of output value to the input value Change in output with each change in input Degree of freedom from random errors
Answer Explanation

MCQs 2: If a pressure gauge of range 0 - 10 bar has a quoted inaccuracy of ±1.0 % of full scale reading, then it means

Minimum expected error in any reading is 0.1 bar Maximum expected error in any reading is 0.1 bar Maximum expected error in any reading is 1 bar Minimum expected error in any reading is 1 bar
Answer Explanation

MCQs 3: An instrument with a range of 0 -10 bar is used for measuring pressure. If the expected value of reading is between 0 and 1 bar then the instrument will give

More accurate readings than the instrument with range of 0 - 5 bar Less accurate readings than the instrument with range of 0 - 5 bar Accuracy of reading will be same for both the instruments with range of 0 - 10 bar and 0 - 5 bar None of these
Answer Explanation

MCQs 4: A voltmeter connected across a resistor gives a value of 65 V but the expected value of resistor was 68 V. Then the absolute error and the relative accuracy of the measurement will be

3.2%, 96.8% 3.8%, 96.2% 4%, 96% 4.4%, 95.59%
Answer Explanation

MCQs 5: Precision of an instrument is defined as

Closeness of output to the true value Change in output for every change in input Degree of freedom from random errors Both (a) and (b)
Answer Explanation

MCQs 6: An instrument with high precision implies

High accuracy Low accuracy Does not imply anything about measurement accuracy None of these
Answer Explanation

MCQs 7: Low accuracy measurements from a high precision instrument are normally caused by

Bias in the measurement Human errors Instrumental defect Low temperature
Answer Explanation

MCQs 8: Choose the correct option. I. Repeatability means the closeness of output readings when the same input is applied repetitively over a short period of time, with the same measurement conditions and same instruments. II. Reproducibility means the closeness of output readings for the same input when there are changes in the method of measurement and conditions of measurement

Both I and II are correct Only I is correct Only II is correct Both are incorrect
Answer Explanation

MCQs 9: Integrating instruments is the subdivision of the secondary instruments. The example for integrating instruments is

Ampere - hour meters Watt - hour meters Wattmeters Ampere - hour and watt - hour meters
Answer Explanation

MCQs 10: The moving system in the indicating instruments is subjected to

Deflecting torque Controlling torque Damping torque All the above None of the above
Answer Explanation

MCQs 11: A spring controlled moving iron voltmeter with full scale deflection of 150 V draws a current of 2 mA. What will be the meter reading if it draws a current of 1 mA?

25.5 V 27.5 V 35.5 V 37.5 V
Answer Explanation

MCQs 12: A repulsion type moving iron instrument when used with AC circuits, the deflecting torque is

Directly proportional to the rms current Directly proportional to the square of rms current Directly proportional to the peak current Directly proportional to the square of the peak current
Answer Explanation

MCQs 13: What will a moving iron ammeter read if a rectangular waveform current with peak value of 120 mA is passed through it?

120 mA 84.8 mA 169.7 mA 60 mA
Answer Explanation

MCQs 14: A moving iron instrument is used as an ammeter. Its range can be extended by using

Suitable shunt across its terminal A high non - inductive resistance Either (a) or (b) Neither (a) nor (b)
Answer Explanation

MCQs 15: For extending the range of 0 - 150 V to 0 - 500 V in a 10000 Ω / V meter, the value of series resistance required is equal to

3 M Ω 3.5 M Ω 4 M Ω 4.5 M Ω
Answer Explanation

MCQs 16: A current of 2 + 3sinωt A is passed through a moving iron instrument and through a meter respectively. The readings of the two meters are

2 A, 2 A 2 A, 2.9 A 2.9 A, 2.9 A 2.9 A, 2 A
Answer Explanation

MCQs 17: In a permanent magnet moving coil instrument, the deflecting torque is

Directly proportional to both number of turns and flux density Directly proportional to the number of turns and inversely proportional to the flux density Inversely proportional to the number of turns and directly proportional to the flux density Inversely proportional to both number of turns and flux density
Answer Explanation

MCQs 18: The accuracy in a bridge measurement depends on

Sensitivity of detector Applied voltage Accuracy of indicator Both (a) and (b)
Answer Explanation

MCQs 19: The high resistances are found in

Insulation resistance of cables and wires Resistance of shunt field winding and the multipliers Resistance of armature windings of electrical machine Resistance of series field winding of a dc machine
Answer Explanation

MCQs 20: A null type of bridge with DC excitation is commonly known as

Wheatstone bridge Anderson bridge Wien bridge Schering bridge
Answer Explanation

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