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  #1  
September 5th, 2012, 12:59 PM
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Join Date: Mar 2012
Railway Exams for Mechanical ENGG

Hello sir I want to apply for railway exam so please give me the syllabus of railway exam for Mechanical Engineering.

As you are looking to download question papers of Junior Engineer Exam to join Indian Railway for Mechanical Engineering candidates, so here I am providing question papers:

Indian Railway Junior Engineer Exam Mechanical Engineer Question Paper
1. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
(a) 1/2
(b) 1
(c) 2
(d) 4
(e) 8.
Ans: c

2. In a diesel engine, the fuel is ignited by
(a) spark
(b) injected fuel
(c) heat resulting from compressing air that is supplied for combustion
(d) ignitor
(e) combustion chamber.
Ans: c

3. Scavenging air in diesel engine means
(a) air used for combustion sent under pres-sure
(b) forced air for cooling cylinder
(c) burnt air containing products of com-bastion
(d) air used for forcing burnt gases out of engine's cylinder during the exhaust period
(e) air fuel mixture.
Ans: d

4. Supercharging is the process of
(a) supplying the intake of an engine with air at a density greater than the density of the
surrounding atmosphere
(b) providing forced cooling air
(c) injecting excess fuel for raising more load
(d) supplying compressed air to remove combustion products fully
(e) raising exhaust pressure.
Ans: a

5. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?
(a) yes
(b) no
(c) to some extent
(d) unpredictable
(e) depends on other factors.
Ans: b

6. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called
(a) net efficiency
(b) efficiency ratio
(c) relative efficiency
(d) overall efficiency
(e) cycle efficiency.
Ans: c

7. Compression ratio of LC. engines is
(a) the ratio of volumes of air in cylinder before compression stroke and after compression stroke
(b) volume displaced by piston per stroke and clearance volume in cylinder
(c) ratio of pressure after compression and before compression
(d) swept volume/cylinder volume
(e) cylinder volume/swept volume.
Ans: a

8. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression

ratio is

(a) same

(b) less

(c) more

(d) more or less depending on power rating

(e) unpredictable.

Ans: c

-

9. The calorific value of gaseous fuels is expressed in terms of

(a) kcal

(b) kcal/kg

(c) kcal/m2

(d) kcal/n?

(e) all of the above.

Ans: d

11. If the intake air temperature of I.C. engine increases, its efficiency will

(a) increase

(b) decrease

(c) remain same

(d) unpredictable

(e) depend on other factors.

Ans: b

12. All heat engines utilize

(a) low heat value of oil

(b) high heat value of oil

(c) net claorific value of oil

(d) calorific value of fuel

(e) all of the above.

Ans: a

13. An engine indicator is used to determine the following

(a) speed

(b) temperature

(c) volume of cylinder

(d) m.e.p. and I.H.P.

(e) BHP.

Ans: d

14. Fuel oil consumption guarantees for I .C. engine are usually based on

(a) low heat value of oil

(b) high heat value of oil

(c) net calorific value of oil

(d) calorific value of fuel

-

(e) all of the above.

Ans: b

17. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age

increase in efficiency will be

(a) 2%

(b) 4%

(c) 8%

(d) 14%

(e) 27%.

Ans: d

18. In case of gas turbines, the gaseous fuel consumption guarantees are based on

(a) high heat value

(b) low heat value

(c) net calorific value

(d) middle heat value

(e) calorific value.

Ans: b

19. In a typical medium speed 4-stroke cycle diesel engine the inlet valve

(a) opens at 20° before top dead center and closes at 35° after the bottom dead center

(b) opens at top dead center and closes at bottom dead center

(c) opens at 10° after top dead center and closes 20° before the bottom dead center

(d) may open or close anywhere

(e) remains open for 200°.

Ans: a

20. The pressure and temperature at the end of compression stroke in a petrol engine are of the

order of

(a) 4 - 6 kg/cm2 and 200 - 250°C

(b) 6 - 12 kg/cm2 and 250 - 350°C

(c) 12 - 20 kg/cm2 and 350 - 450°C

(d) 20 - 30 kg/cm2 and 450 - 500°C

(e) 30 - 40 kg/cm2 and 500 - 700°C.

Ans: b

-

21. The pressure at the end of compression in the case of diesel engine is of the order of

(a) 6 kg/cm

(b) 12kg/cmz

(c) 20 kg/cmz

(d) 27.5 kg/cmz

(e) 35 kg/cm

Ans: e

22. The maximum temperature in the I.C. engine cylinder is of the order of

(a) 500- 1000°C

(b) 1000- 1500°C

(c) 1500-2000°C

(d) 2000-2500°C

(e) 2500-3000°C

Ans: d

23. The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off

ratio will

(a) increase

(b) decrease

(c) be independent

(d) may increase or decrease depending on other factors

(e) none of the above.

Ans: b

24. Pick up the wrong statement

(a) 2-stroke engine can run in any direction

(b) In 4-stroke engine, a power stroke is obtained in 4-strokes

(c) thermal efficiency of 4-strokc engine is more due to positive scavenging

(d) petrol engines work on to cycle

(e) petrol engines occupy more space than diesel engines for same power output.

Ans: e

25. Combustion in compression ignition engines is

(a) homogeneous

(b) heterogeneous

(c) both (a) and (b)

-

(d) laminar

(e) turbulent.

Ans: b

26. The fuel in diesel engine is normally injected at pressure of

(a) 5-10 kg/cm2

(b) 20-25 kg/cm2

(c) 60-80 kg/cm2

(d) 90-130 kg/cm2

(e) 150-250 kg/cm2

Ans: d

27. The specific fuel consumption per BHP hour for diesel engine is approximately

(a) 0.15 kg

(b) 0.2 kg

(c) 0.25 kg

(d) 0.3 kg

(e) 0.35 kg.

Ans: b

28. The temperature of interior surface of cylinder wall in normal operation is not allowed to

exceed

(a) 80°C

(b) 120°C

(c) 180°C

(d) 240°C

(e) 320°C.

Ans: c

30. Crankcase explosion in I.C. engines usually occurs as

(a) first a mild explosion followed by a bi explosion

(b) first a big explosion followed by a mil explosion

(c) both mild and big explosions occi simultaneously

(d) never occurs

(e) unpredictable.

Ans: a

-

31. Compression loss in I.C engines occurs duto

(a) leaking piston rings

(b) use of thick head gasket

(c) clogged air-inlet slots

(d) increase in clearance volume caused b bearing-bushing wear

(e) all of the above.

Ans: e

32. The specific fuel consumption per BH hour for a petrol engine is approximately

(a) 0.15 kg

(b) 0.2 kg

(c) 0.25 kg

(d) 0.3kg

(e) 0.35 kg.

Ans: c

33. The air requirement of a petrol engine during starting compared to theoretical required for

complete combustion is

(a) more

(b) loss

(c) same

(d) may be more or less depending on engine capacity

(e) unpredictable.

Ans: b

34. The inlet value of a four stroke cycle I.C engine remains open for nearly

(a) 180°

(b) 125°

(c) 235°

(d) 200°

(e) 275°.

Ans: c

35. Which of the following is not an interna combustion engine

(a) 2-stroke petrol engine

(b) 4-stroke petrol engine

(c) diesel engine

-

(d) gas turbine

(e) steams turbine.

Ans: e

36. Pick up the false statement

(a) Thermal efficiency of diesel engine i about 34%

(b) Theoretically correct mixture of air am petrol is approximately 15 : 1

(c) High speed compression engines operate on dual combustion cycle

(d) Diesel engines are compression ignition engines

(e) S.I. engines are quality-governed engines.

Ans: e

37. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the

(a) exhaust will be smoky

(b) piston rings would stick into piston grooves

(c) exhaust temperature will be high

(d) engine starts overheating

(e) scavenging occurs.

Ans: e

38. The output of a diesel engine can be increased without increasing the engine revolution or size

in following way

(a) feeding more fuel

(b) increasing flywheel size

(c) heating incoming air

(d) scavenging

(e) supercharging.

Ans: e

39. It the temperature of intake air in IC engines is lowered, then its efficiency will

(a) increase

(b) decrease

(c) remain same

(d) increase upto certain limit and then decrease

(e) decrease upto certain limit and then in-crease.

Ans: a

-

40. In a typical medium speed 4-stroke cycle diesel engine

(a) compression starts at 35° after bottom dead center and ends at top dead center

(b) compression starts at bottom dead center and ends at top dead center

(c) compression starts at 10° before bottom dead center and, ends just before top dead center

(d) may start and end anywhere

(e) none of the above.

Ans: a

41. For the same compression ratio

(a) Otto cycle is more efficient than the Diesel

(b) Diesel cycle is more efficient'than Otto

(c) both Otto and Diesel cycles are, equally efficient

(d) compression ratio has nothing to do with efficiency

(e) which is more efficient would depend on engine capacity.

Ans: a

42. The precess of breaking up or a liquid into fine droplets by spraying is called

(a) vaporisation

(b) carburetion

(c) ionisation

(d) injection

(e) atomisation.

Ans: e

43. As a result of detonation in an I.C. engine, following parameter attains very high value

(a) peak pressure

(b) rate of rise of pressure

(c) rate of rise of temperature

(d) peak temperature

(e) rate of rise of horse-power.

Ans: b

44. Which of the following statements is cor¬rect?

(a) All the irreversible engines have same efficiency

(b) All the reversible engines have same efficiency

(c) Both Rankine and Caront cycles have same efficiency between same tempera¬ture limits

(d) All reversible engines working between same temperature limits have same-ef-ficiency

-

(e) Between same temperature limits, both petrol and diesel engines have same ef-ficiency.

Ans: d

45. Most high speed compression engines operate on

(a) Diesel cycle

(b) Otto cycle

(c) Dual combustion cycle

(d) Special type of air cycle

(e) Carnot cycle.

Ans: c

48. The accunmulation of carbon in a cylinder results in increase of

(a) clearance volume

(b) volumetric efficiency

(c) ignition time

(d) effective compression ratio

(e) valve travel time.

Ans: d

49. Which of the following medium is compressed in a Diesel engine cylinder

(a) air aione

(b) air and fuel

(c) air and lub oil

(d) fuel alone

(e) air, fuel and lub oil.

Ans: a

54. The air-fuel ratio of the petrol engine is controlled by

(a) fuel pump

(b) governor

(c) injector

(d) carburettor

(e) scavenging.

Ans: d

55. In a typical medium speed, 4-stroke cycle diesel engine

(a) fuel injection starts at 10° before to dead center and ends at 20° after tor dead center

-

(b) fuel injection starts at top dead center and ends at 20° after top dead center

(c) fuel injection starts at just before top dead center and ends just after top dead center

(d) may start and end anywhere

(e) none of the above.

Ans: a

56. Diesel fuel, compared to petrol is

(a) less difficult to ignite

(b) just about the same difficult to ignite

(c) more difficult to ignite

(d) highly ignitable

(e) none of the above.

Ans: c

57. In diesel engine the diesel fuel injected intc cylinder would burn instantly at about compressed

air temperature of

(a) 250°C

(b) 500°C

(c) 1000°C

(d) 150CPC

(e) 2000°C.

Ans: c

58. When crude oil is heated, then which of the following hydrocarbon is given off first.

(a) kerosene

(b) gasoline

(c) paraffin

(d) diesel

(e) natural gas.

Ans: e

59. The rating of a diesel engine, with increase in air-intlet temperature, will

(a) increase linearly

(b) decrease linearly

(c) increase parabolically

(d) decrease parabolically

(e) first decrease linearly and then increase parabolically.

-

Ans: b

60. A 75 cc engine has following parameter as 75 cc

(a) fuel tank capacity

(b) lub oil capacity

(c) swept volume

(d) cylinder volume

(e) clearance volume.

Ans: c

Last edited by Neelurk; March 5th, 2020 at 01:21 PM.
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  #2  
February 16th, 2017, 11:25 AM
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Re: Railway Exams for Mechanical ENGG

I want to join Indian Railway as Junior Engineer. I have completed Graduation in Mechanical Engineering discipline. I need old question papers of Junior Engineer Exam of Indian Railway for Mechanical Engineering candidates. So tell me on which site I can download question papers?


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