Latest: >

Search This Blog

RRB Junior engineer(electrical) Model Questions

1. A parabolic curve introduced between straight and a circular curve or between two branches of a compound curve for ease, comfort and safety of movement of trains on curve is called:
(a) Spur curve (b) Transition curve
(c) Summit curve (d) Valley curve
Ans : B

2. The staggered rails joints are usually provided on:
(a) Bridge (b) Curves (c) Branching (d) Tangents
Ans : B

3. The track capacity can be increased by:
(a) Faster movement of trains on the track
(b) By using more powerful engines
(c) All the above
(d) None of the above
Ans : C

4. The railway station at which a track line meets a main line is called:
(a) terminal station (b) flag station
(c) way side station (d) junction station
Ans : D

5. The limiting value of super elevation of board gauge in Indian Railways is:
(a) 16.50 cm (b) 30 cm (c) 15 cm (d) 10 cm
Ans : A

6. The chart used for recording the condition of track is known as:
(a) Rolling chart (b) Track chart
(c) Hallade chart (d) Vibro chart
Ans: C

7. The most common system of signaling in India is the …… system.
(a) automatic block (b) section clear system
(c) absolute block (d) pilot guard system
Ans : C

8. The feeder gauge …. is commonly used for feeding raw materials to big Government manufacturing concerns as well as to private factories such as steel plants, oil refineries, sugar factories etc.
(a) 0.6096 m (b) 0.792 m (c) 1m (d) 1.676 m
Ans : A

9. Which one of the following bolts is not used in rail track:
(a) Fang bolt (b) Eye bolt (c) Rag bolt (d) Fish bolt
Ans : B

10. The gradient which requires one or more additional locomotive for hauling the load over the gradient is called:
(a) Up-gradient (b) Pusher gradient
(c) Steep gradient (d) Momentum gradient
Ans : B

11. Points and crossings are provided for change of ….on permanent ways.
(a) gauge (b) direction and gradient
(c) direction (d) gradient
Ans : C

12. In locomotive ‘hunting’ is:
(a) Movement of locomotive in vertical plane perpendicular to its movement along the track
(b) Sinuous path taken by engine as against the alignment of the track
(c) Motion after brakes have been applied
(d) Combination of A and B above
Ans : D

13. The rails which get battered due to action of wheels over the end of the rails are called:
(a) Hogged rails (b) Roaring rails
(c) Creep rails (d) Bucking rails
Ans : A

14. In broad gauge, the clear horizontal distance between the inner faces of two parallel rails forming the track is:
(a) 1 m (b) 1.676 m (c) 0.6096 m (d) 0.792 m
Ans : B

15. As per Indian standard, the recommended width of ballast section at foot level of rails for broad gauge tracks should be:
(a) 4.38 m (b) 3.35 m (c) 1.83 m (d) 2.25 m
Ans : B

16. The minimum length of a passenger platform for broad gauge railway should not be less than:
(a) 305 m (b) 183 m (c) 495 m (d) 250 m
Ans : A

17. Generally the shape of fish plate is:
(a) elliptical (b) bone shaped (c) circular (d) rectangular
Ans : B

18. For wooden sleepers, size of the ballast should be:
(a) 2.54 cm (b) 10.16 cm (c) 3.8 cm (d) 5.1 cm
Ans : C

19. The length of track under the control of a Ganger is:
(a) 10 to 15 Km (b) 5 to 6 KM
(c) 3 to 5 KM (d) 1 to 2 KM
Ans : B

20. The maximum rising gradient which is provided keeping the power of locomotive in view, is called
(a) Momentum gradient (b) Pusher gradient
(c) Down gradient (d) Ruling gradient
Ans : D

21. The latest system of signaling introduced is:
(a) C.T.C. system (b) pilot guard system
(c) section clear system (d) automatic block system
Ans : A

22. Detonating signals are used:
(a) for noisy engines
(b) during foggy and cloudy weather
(c) for deaf drivers
(d) not now, were in use in nineteenth century only
Ans : B

23. The number of fish bolts used for joining the rails with the help of fish plates, is generally:
(a) 4 (b) 8 (c) 2 (d) 6
Ans : A

24. The Railways provided underground at a depth of about 18 m or more are called:
(a) Mono railway (b) Underground railway
(c) Railway (d) Tube railway
Ans : D

25. The art of providing an outward slope of …. to the treads of wheels of rolling stock is known as coning of wheels.
(a) 1 in 30 (b) 1 in 10 (c) 1 in 4 (d) 1 in 20
Ans : D

26. The process of connecting a track length by an electric circuit is known as track circuiting and the sleepers which are suitable for it are:
(a) cast iron sleepers (b) steel sleepers
(c) wooden sleepers (d) all above are suitable
Ans : C

27. The movable tapered end of the tongue rail is known as:
(a) heel of switch (b) toe of switch
(c) stretcher bar (d) throw of switch
Ans : B
28. The yard where trains and other loads are received, sorted out, trains formed and dispatched onwards are known as:
(a) locomotive yard (b) goods yard
(c) marshalling yard (d) station yard
Ans : C

29. Wider gauge permits:
(a) sleeper gradients (b) low axle load
(c) higher operating speeds (d) sharp curves
Ans : C

30. Which one of the following is expected to have shorter life?
(a) Steam engine (b) Diesel engine
(c) Electric engine (d) Shunting engine
And : B

31. The movable end of the tapered rail, by means of which the flanged wheels of the train are diverted from one track to another is known as:
(a) Toe (b) Stud (c) Heel (d) Flare
Ans : A

32. The creep in rails is measured in:
(a) cm/kg (b) cm (c) Kg/cm (d) kg cm
Ans : B

33. When a rail loses its weight by 5%, it should be renewed and the old one can be used on unimportant tracks, but the rails which have lost their weight by more than …., should not be used on any track under any circumstances.
(a) 8% (b) 33.3% (c) 10% (d) 20%
Ans : C

34. In railways, super elevation is provided to:
(a) facilitate drainage
(b) counteract the centrifugal push
(c) counteract the centripetal pull
(d) have all the effects mentioned above
Ans : B

35. The additional track connected to main line at both of its ends is called:
(a) running line (b) loop line
(c) main line (d) none are correct
Ans : B

36. The rails which help in channelising the wheels in their proper routes are known as:
(a) Guard rails (b) Wing rails? (c) Check rails (d) Lead rails
Ans : B

37. The shape of wheels of rolling stock is:
(a) Tapered with flange on outside
(b) Parallel with flange on inside
(c) Tapered with flange on inside
(d) Parallel with flange on outside
Ans : C

38. The maximum gradient for broad gauge in station yards in Indian Railways is:
(a) 1 in 100 (b) 1 in 1000 (c) 1in 200 (d) 1 in 400
Ans : D

39. The force which resists the forward movement and speed of train is called:
(a) Track modulus (b) Hauling resistance
(c) friction (d) Tractive resistance
Ans : D

40. The tractive resistance of the route in railways as compared to roadways will be:
(a) same (b) more (c) low (d) not comparable
Ans : C

41. Sand is used as ballast incase of:
(a) steel sleepers
(b) wooden sleepers
(c) reinforced concrete sleepers
(d) cast iron sleepers
Ans : D

42. Arm type fixed signals, fitted on a vertical post fixed at the side of a track, are called:
(a) Warner signals (b) Starter signals
(c) Semaphore signals (d) Cab signals
Ans : C

43. The Railway provided just below the ground level are called:
(a) Tube railway (b) Underground railway
(c) Mono railway (d) Railway
Ans : B

44. When a railway line crosses a valley, a ridge like structure consisting of a series of piers, piles or trestles on which steel girders are placed and which is constructed usually for small spans is known as:
(a) Bridge (b) Tunnel (c) Viaduct (d) Aqueduct
Ans : C

45. Creeping of rails will be reduced by using:
(a) Bearing plates (b) Spikes (c) Chairs (d) Anchors
Ans : D

46. The railway track from which a train is to be diverted is called:
(a) branch track (b) points and crossing
(c) main or through track (d) all above
Ans : C

47. An expansion gap of …. is usually kept between the adjoining rail ends to allow for expansion of rail, due to variation in temperature.
(a) 1 to 3 mm (b) 10 to 15 mm
(c) 6 to 8 mm (d) 3 to 5 mm
Ans : C

48. Generally the weight/metre of the rails used in broad gauge is:
(a) 55 kg (b) 45 kg (c) 35 kg (d) 65 kg
Ans : A

49. A dynamometer car is used for:
(a) Tourists (b) Dinning facilities
(c) Inspection of administrative officers
(d) Recording the condition of track
Ans : D

50. Which of the following is not a part of rail engine?
(a) Tender (b) Stream turbine (c) Boiler (d) Fire box
Ans : B

51. The frequency of DC current
(a) Equal to voltage magnitude
(b) 0
(c) Double of AC frequency
(d) 50 HZ
Ans : b

52. The current flowing in a purely inductive circuit of 30 mH on application of 230 V,
50 Hz single phase supply is 24.4 A. If the frequency of the applied voltage is
increased to 100 Hz the current flowing in the same circuit will be
(a) 24.4 A
(b) 48.8 A
(c) 12.2 A
(d) 6.1 A
Ans : c

53. Find the total resistance when two 3 Ohm resistances are connected in parallel.
(a) 1.11 ohms
(b) 1.5 ohms
(c) 0.707 ohms
(d) 1.23 ohms
Ans : b

54. Voltage drop in a resistance given by
(a) mmf/reluctance
(b) IR
(c) I/R
(d) VI
Ans : b

55. Off-line converter, SMPS has
a. AC input and dc output
b .DC input and dc output
c. AC input and ac output
d. None
Ans. a

56. Filter circuits are constructed by means of
a. Diode
b. Resistors
c. Transformers
d. Capacitor and inductors
Ans. d

57. Resistance of the diode is decreased when
a. Forward biased
b. Reverse biased
c. Both forward and reverse biased
d. Either a or b
Ans. a

58. In earlier time is used for voltage regulation.
a. Diode
b. Transistors
c. Vacuum tubes and glow bulbs
Ans. c

59. is the equipment used during power failure.
a. Rectifier
b. Voltage regulators
c. UPS
Ans. c

60. Peak factor of the sine wave is equal to
(a) 0.901
(b) 1.414
(c) 1.1
(d) 1.11
Ans :b

61. The amplitude of current of full wave rectified sinusoidal wave is 80 A, its average
value will be
(a) 25.44A
(b) 80A
(c) 40A
(d) 56.56A
Ans : a

62.Find the total current supplied to the lamp rated 100w .when supply voltage is 200 v.
(a) 1.75A
(b) 2A
(c) 0.5A
(d) 1A
(e) Ans : c

63. The power factor of a inductive circuit is
(a) Lagging
(b) Leading
(c) Zero lagging
(d) Unity
Ans : a

64. The power factor of a purely capacitive circuit is always
(a) Lagging
(b) Leading
(c) Unity
(d) Zero lagging
Ans : b

65. The overall circuit power factor of a RLC series circuit is found to be 0.898 lagging. The nature of the resultant circuit is
(a) Resistive
(b) Inductive
(c) Capacitive
(d) None of these
Ans : b

66. The maximum, rms and average value of a periodic current wave form is 100 A,
64.42A and 57.5A, respectively. The peak factor of this wave is
(a) 0.644
(b) 1.552
(c) 1.12
(d) None of these
Ans : b

67. In a parallel resistance circuit
(a) Power is same in all resistance
(b) Current is same in all resistance
(c) Voltage is same in all resistance
(d) Resistances are same
Ans : c

68. Find the total resistance when 2 Ohm and 4 Ohm resistances are in parallel.
(a) 1.33 Ohms
(b) 0.33 Ohms
(c) 2.33 Ohms
(d) 1 Ohm
Ans : a

69. Expression for mmf in terms of field strength is
(a) HI
(b) H/I
(c) HL
(d) H/L
Ans : c

70. is the property of magnetic which opposes the flow of flux through it.
(a) Resistance
(b) MMF
(c) Reluctance
(d) emf
Ans : c

71. is the property of electrical conductor which oppose the flow of current through it
(a) Reluctance
(b) emf
(c) mmf
(d) Resistance
Ans : d

72. Reluctance is expressed in
(a) Ampere Weber
(b) Ohm
(c) Ampere/Weber
(d) Volt/Ampere
Ans : c

73. Reciprocal of reluctance is termed as
(a) Conductance
(b) Permenance
(c) Permeability
(d) None of these
Ans : b

74. Ohm’s law for electric circuit will be
(a) emf= current/resistance
(b) emf= current X resistance
(c) emf= resistance/current
(d) emf= 1/( resistance X current)
Ans : b

75. Ohm’s law for magnetic circuit will be
(a) mmf= flux /resistance
(b) flux= mmf X resistance
(c) reluctance = mmf/ flux
(d) Resistance= mmf X flux
Ans : c

No comments:

Post a Comment

Thanks for choosing NAUKRI EXPRESS Dear Friends please post your valuable comments by which we can provide good service in future