Chapter 4 Resistance Measurement and Resistance Measuring Devices MCQs

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1. From the view point of measurement, resistance is divided into the groups
(A) 5
(B) 2
(C) 4
(D) 3

2. Resistance of following items fall in “low resistance” group
(A) All these
(B) Insulation of cables and multipliers of voltmeters
(C) Winding of large machines
(D) Large power cables and shunts of ammeters

3. Resistance of following electrical items fall in “high resistance” group
(A) Both a & b
(B) Insulation of electrical cables
(C) Series winding of large electrical machines
(D) Insulation of electrical machines

4. Ohm meter is used for the
(A) Measurement of resistance
(B) Measurement of voltage
(C) Measurement of power
(D) All these

5. Precaution in the use of ohm meter
(A) It should be used in vertical position
(B) Supply of the machine (whose resistance is to be measured) should be ON
(C) Supply of the machine (whose resistance is to be measured) should be off
(D) None of these

6. Number of basic types of ohm meter are
(A) 4
(B) 2
(C) 3
(D) 5

7. In series type ohm meter
(A) Battery and meter are connected in series while load in parallel
(B) Load resistance is connected across (parallel) the meter
(C) Battery, meter and load resistance are connected in series
(D) Both a & c

8. It is difficult to measure the resistance of this level with series type ohm meter
(A) All these
(B) High level resistance
(C) Medium level resistance
(D) Low level resistance

9. Symbol of infinity on series type ohm meter is placed on the
(A) Centre of the scale
(B) Left side of the scale
(C) Right side of the scale
(D) No such symbol is available

10. Its power should be turned off, if it is not in use
(A) Both a & c
(B) Shunt type ohm meter
(C) Digital type ohm meter
(D) Series type ohm meter

11. Shunt type ohmmeter is used to measure
(A) Resistance of very low value
(B) Resistance of medium value
(C) Resistance of high value
(D) Resistance of multipliers

12. Number of meter movements used in analogue multi-meter are
(A) 01
(B) 02
(C) 03
(D) 04

13. By setting the selector switch on ohm range and shorting the leads of meter, if pointer does not come on zero position, it is an indication of
(A) Resistance of meter has been increased
(B) Spring of meter has become loose
(C) Battery of meter has become weak
(D) Pivot has been worn out

14. Number of terminals of a Megger are
(A) 01
(B) 03
(C) 04
(D) 02

15. A Megger is usually made
(A) Both a & b
(B) Battery operated
(C) Generator operated
(D) None of these

16. Guard terminal on Megger is provided
(A) For ground test
(B) None of these
(C) For resistance measurement
(D) To avoid electric shock from Megger

17. Both coils of Megger are fixed at
(A) 35°
(B) 90°
(C) 50°
(D) 120°

18. Megger generator has voltage
(A) 500V
(B) 1000V
(C) 2500V
(D) All these

19. Megger is used for
(A) To measure the insulation resistance of underground cables
(B) To check the short circuit of electrical installations
(C) All these
(D) To test the insulation resistance of electrical machines

20. During resistance measurements, the handle of Megger is rotated at the speed of
(A) 20 RPM
(B) 120 RPM
(C) 60 RPM
(D) 160 RPM

21. Scale of Megger is calibrated in
(A) All these
(B) Kilo ohms
(C) Ohms
(D) Mega ohms

22. Number of terminals on earth tester are
(A) 03 or 04
(B) 02
(C) 01
(D) 05

23. Earth tester is used
(A) To check the quality of earth
(B) All these
(C) To check the insulation resistance of motors
(D) To check the resistance of earth

24. Scale of earth tester is made
(A) Up to 50 Ω
(B) Up to 100 Ω
(C) Up to 50M Ω
(D) Both a & b

25. Earth tester sends in the soil
(A) Both AC & DC currents
(B) AC current
(C) DC current
(D) None of these

26. Wheatstone bridge is used to measure
(A) Resistances of very low level
(B) Resistances of low level
(C) Resistances of medium level
(D) None of these

27. Resistance arms used in Wheatstone bridge are
(A) 02
(B) 03
(C) 04
(D) 06

28. Kelvin’s double bridge is a
(A) None of these
(B) Modified form of rectifier bridge
(C) Modified form of Maxwell bridge
(D) Modified form of Wheatstone bridge

29. Ratio arms used in Kelvin’s double bridge are
(A) 01
(B) 03
(C) 02
(D) 04

30. The suitable instrument to measure 0.1 Ω resistance is
(A) Megger
(B) Ohm meter
(C) Kelvin’s double bridge
(D) Wheatstone bridge

31. Indirectly, a Wheatstone bridge can also be used to measure
(A) Heat
(B) All these
(C) Torque
(D) Pressure

32. Wheatstone bridge was invented by
(A) Sir Charles Wheatstone
(B) Edison
(C) Samuel Hunter Christie
(D) Michio Kaku

33. Wheatstone bridge works on the principle of
(A) Mutual induction
(B) Self-induction
(C) Current is inversely proportional to the circuit resistance
(D) Current flows between two points having different potential

34. Murray loop test is used to find the
(A) Short circuit fault of machines
(B) Both b & c
(C) Short circuit fault of underground cables
(D) Earth fault of underground cables

35. The suitable Megger to check the electrical installation of 400V is
(A) Having generator voltage of 1000V
(B) Having generator voltage of 500V
(C) Having generator voltage of 5000V
(D) Having generator voltage of 1500V

36. The suitable Megger to check the electrical installation of 250V is
(A) Having generator voltage of 5000V
(B) Having generator voltage of 1000V
(C) Having generator voltage of 500V
(D) Having generator voltage of 1500V