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Multiple Choice Question (MCQ) of Measurements page-2


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11. The ampere-hour efficiency of a cell does not take into account the varying voltage of charge and discharge.

a) True
b) False

Ans: (a)

12. Watt-hour efficiency of a cell is always less than ampere-hour efficiency because

a) It takes into account the varying voltage of charge and discharge
b) Charge volts are constant
c) Discharge volts are constant
d) Polarization is neglected

Ans: (a)

13. The capacity of a cell is measured in

a) Ampere
b) Volts
c) Ampere-hours
d) Watts

Ans: (c)

14. The capacity of a cell increase as the temperature increases.

a) True
b) False

Ans: (a)

15. The gassing is the phenomenon which occurs in

a) Oil transformers
b) Cells
c) Mercury are rectifier
d) Oil cylinders

Ans: (b)

16. The ampere-hour efficiency of a lead acid cell is

a) 80%
b) 90 to 95%
c) 72 to 80 %
d) 85%

Ans: (b)

17. The gravity controlled instruments have scales which are not uniform but crowded because

a) Balance weight is more than control weight
b) Current is proportional to deflection angle
c) Current is proportional to sin⁡ θ, where θ is deflection angle
d) Balance weight itself is not uniform

Ans: (c)

18. Which of the following instrument will be used to measure alternating current?

a) Moving iron voltmeter
b) Permanent Magnet type ammeter
c) Induction type ammeter
d) Moving iron (attraction type) ammeter

Ans: (d)

19. Eddy current damping cannot be used for moving iron instrument because

a) The size of the instrument will increase
b) Eddy currents will pass through the iron and thereby causing loss
c) The presence of a permanent magnet required for such purpose would affect the defection and hence the reading of the instruments
d) Weight of instrument will increase

Ans: (c)

20. The deflection of a hot wire instrument depends on

a) Instantaneous value of alternating on
b) Average value of current
c) R.m.s. value of alternating current
d) voltage

Ans: (c)

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