1. From the view point of measurement, resistance is divided into the groups
(A) 2
(B) 3
(C) 4
(D) 5
2. Resistance of following items fall in “low resistance” group
(A) Insulation of cables and multipliers of voltmeters
(B) Large power cables and shunts of ammeters
(C) Winding of large machines
(D) All these
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 voltage
(B) Measurement of power
(C) Measurement of resistance
(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 off
(C) Supply of the machine (whose resistance is to be measured) should be ON
(D) None of these
6. Number of basic types of ohm meter are
(A) 5
(B) 4
(C) 3
(D) 2
7. In series type ohm meter
(A) Battery, meter and load resistance are connected in series
(B) Load resistance is connected across (parallel) the meter
(C) Battery and meter are connected in series while load in parallel
(D) Both a & c
8. It is difficult to measure the resistance of this level with series type ohm meter
(A) Medium level resistance
(B) High level resistance
(C) Low level resistance
(D) All these
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 medium value
(B) Resistance of very low 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) To avoid electric shock from Megger
(B) For ground test
(C) For resistance measurement
(D) None of these
17. Both coils of Megger are fixed at
(A) 35°
(B) 50°
(C) 120°
(D) 90°
18. Megger generator has voltage
(A) 500V
(B) All these
(C) 2500V
(D) 1000V
19. Megger is used for
(A) All these
(B) To check the short circuit of electrical installations
(C) To test the insulation resistance of electrical machines
(D) To measure the insulation resistance of underground cables
20. During resistance measurements, the handle of Megger is rotated at the speed of
(A) 160 RPM
(B) 20 RPM
(C) 60 RPM
(D) 120 RPM
21. Scale of Megger is calibrated in
(A) Mega ohms
(B) Kilo ohms
(C) Ohms
(D) All these
22. Number of terminals on earth tester are
(A) 01
(B) 02
(C) 03 or 04
(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) Both a & b
(B) Up to 100 Ω
(C) Up to 50M Ω
(D) Up to 50 Ω
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 medium level
(B) Resistances of low level
(C) Resistances of very low 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) Modified form of Wheatstone bridge
(B) Modified form of rectifier bridge
(C) Modified form of Maxwell bridge
(D) None of these
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) Wheatstone bridge
(D) Kelvin’s double bridge
31. Indirectly, a Wheatstone bridge can also be used to measure
(A) Heat
(B) Pressure
(C) All these
(D) Torque
32. Wheatstone bridge was invented by
(A) Sir Charles Wheatstone
(B) Samuel Hunter Christie
(C) Edison
(D) Michio Kaku
33. Wheatstone bridge works on the principle of
(A) Mutual induction
(B) Current flows between two points having different potential
(C) Self-induction
(D) Current is inversely proportional to the circuit resistance
34. Murray loop test is used to find the
(A) Both b & c
(B) Earth fault of underground cables
(C) Short circuit fault of underground cables
(D) Short circuit fault of machines
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 1500V
(B) Having generator voltage of 1000V
(C) Having generator voltage of 5000V
(D) Having generator voltage of 500V