Model Papers for RRB Junior Engineering

I need Railway Recruitment Board Junior Engineering exam question paper, will you please provide here?

The Railway Recruitment Board Junior Engineering exam questions are:

1. A resistance of 10 ohm is connected across a supply of 200V. If resistance R is now connected in parallel with a 10 ohm resistance, the current drawn from the supply gets doubled. The value of unknown resistance R is
(a) 5 ohm
(b) 20 ohm
(c) 10 ohm
(d) 15 ohm
Ans : c

2. Kirchhoff’s first law is also called as
(a) voltage law
(b) Current law
(c) Mesh Current law
(d) All the above
Ans : b

3. Find the total resistance when four 3 Ohm resistance are connected in series
(a) 3 ohm
(b) 12 ohm
(c) 14 ohm
(d) 8 ohm
Ans : b

4. The practical unit of power is
(a) Joule
(b) Ampere
(c) Watt
(d) Weber
Ans : c

5. Form factor of a sine wave is
(a) 1.414
(b) 1
(c) 0
(d) 1.11
Ans : d

6. The unit of resistance is
(a) Mho
(b) ohm-m
(c) Ohms
(d) Amps
Ans :c

7. Unit of impedance is
(a) Ampere
(b) Volt
(c) Ohm
(d) mho
Ans : c

8. The close path of the flux around any current carrying circuit is referred as
Circuit.
(a) Magnetic
(b) Electric
(c) Electromagnetic
(d) None of these
Ans : a

9. The current flowing in an electrical circuit is due to the existence of
(a) mmf
(b) emf
(c) Resistance
(d) Reluctance
Ans : b

10. The magnetic flux flow through a magnetic circuit is due to
(a) mmf
(b) emf
(c) Resistance
(d) Reluctance
Ans : a
11. The on-line UPS is also called as
a. Stand-by UPS
b. Line Interactive UPS
c. Off line UPS
d. Current line UPS
Ans. b
12. ________ is used to convert alternating current to direct current.
a. Transformer
b. Diode
c. Resistor
d. Transistor
Ans. b
13. The supply voltage varies sinusoid ally and has a frequency __________ Hz.
a. 60
b. 50
c. 20
d. 10
Ans. b
14. Expression for magneto-motive force is
(a) N/I
(b) 1/NI
(c) I/N
(d) IN
Ans : d
15. Unit of mmf is
(a) Ampere /Volt
(b) Ampere- turns
(c) Volt
(d) Volt/Ampere
Ans : b
16. Magnetic field strength is equal to
(a) mmf. L
(b) L/ mmf
(c) mmf/ L
(d) 1/mmf.L
Ans : c
17. Peak inverse voltage of bridge rectifier is as that of centre-tap circuit.
a. Same
b. Twice
c. Half
d. Four times
Ans. c
18. Peak Resistance of the diode is increased when
a. Forward biased
b. Reverse biased
c. Both forward and reverse biased
d. Either a or b
Ans. b
19. The number of lines of force passing through the secondary coil S when unit current changes in the primary coil P are called
(a) Self inductance
(b) Mutual inductance
(c) Self induction
(d) Mutual induction
Ans : c
20. Unit of flux
(a) Amp- turns
(b) Weber
(c) Volts
(d) Amps
Ans : b

A.. A single acting reciprocating pump, running at 60 r.p.m, delivers 0.01 m2/sec of water. The area of the piston is 0.05m2 and stroke length is 40 cm. Then theoretical discharge of the pump will be
(a) 0.015 m3/sec
(b) 0.02 m3/sec
(c) 0.025 m3/sec
(d) 0.03 m3/sec
Ans:- B

In question (A), the co-efficient of discharge would be
(a) 0.9
(b) 0.8
(c) 0.6
(d) 0.5
Ans:- D

In question (A), the slip of the pump would be
(a) 0.02 m3/sec
(b) 0.01 m3/sec
(c) 0.005 m3/sec
(d) 0.003 m3/sec
Ans:- B


Work done in a free expansion process is
a.0
b.minimum
c.maximum
d. positive

In a reciprocating engine
a. crankshaft and flywheel form 2 kinematic links
b. crankshaft and flywheel form 1 kinematics links
c. crankshaft and flywheel do not form kinematic links
d. flywheel and crankshaft separately form kinematic links

A kinematic chain is known as a mechanism when
a.none of the link is fixed
b.one of the links is fixed
c. two of the links are fixed
d.all of the links are fixed
The impact strength of an material is an index of its
a. Toughness
b. Tensile strength
c. Capability of being cold worked
d. Hardness
e. Fatigue strength
Ans :: a

A feeler gauge is used to check
a. Radius
b. Screw pitch
c. Surface roughness
d. Unsymmetrical shape
e. Thickness of clearance
Ans :: e

The possibility of negative slip in reciprocating pump is when
(a) delivery pipe is short
(b) suction pipe is long
(c) pump is running at high speed
(d) all of the above
Ans:- D

The slip in the reciprocating pump will be negative if
(a) Qth > Qact
(b) Qth < Qact
(c) Qth = Qact
(d) none of the above
Ans:- B

Thermal efficiency of a closed cycle gas turbine plant increases by
a.reheating
b.intercooling
c.regenerator
d. all of the above

The power required to drive a single acting reciprocating pump is equal to
(a) w.A.L.N / 4500
(b) w.A.L.N.(hs + hd)4500
(c) A.L.N. (hs + hd)/4500
(d) w.L.N/4500 where w = specific weight of water

Ans:- B
The rate of flow of water through a double acting reciprocating pump is equal to
(a) A.L.N /60
(b) 2 AL.N/60
(c) A.L.N./2×60
(d) 3 A.L.N./60
Ans:- B


The rate of flow of water through a single acting reciprocating pump is equal to
(a) A.L.N /60
(b) 2 AL.N/60
(c) A.L.N./2×60
(d) 3 A.L.N./60
Ans:- A

Petrol commercially available in India for Indian passenger cars has octane
number in the range
A 40 to 50
B 60 to 70
C 80 to 85
D 95 to 100The knocking tendency in C.I engines increases with
A decrease of compression ratio

B increase of compression ratio
C increasing the temperature of inlet air
D increasing cooling water temperature

The pump, which works on the principle of water hammer, is known as
(a) centrifugal pump
(b) reciprocating pump
(c) hydraulic ram
(d) none of the above
Ans:- C


The pump which raises water without any external power for its operation, is known as
(a) centrifugal pump
(b) reciprocating pump
(c) hydraulic ram
(d) hydraulic intensifier
Ans:- C

The power at the shaft of a centrifugal pump is 100 KW, and the power available at the impeller is 900 KW. If water horse power is 720 KW, then overall efficiency of the centrifugal pump will be
(a) 90% (b) 80% (c) 75% (d) 72%
Ans:- D


Metal in machining operation is removed by
a. Tearing chips
b. Distortion of metal
c. Shearing the metal across a zone
d. Cutting the metal across a zone
e. Pushing the metal with tool
Ans :: c


Which one of the following methods produces gear by generating process
a. Hobbing
b. Casting
c. Punching
d. Milling
e. Broaching
Ans :: a

The term W.Q.Hm / (75 S.H.P) for a centrifugal pump is known as
(a) mechanical efficiency (b) manometric efficiency (c) overall efficiency (d) none of the above
Ans:- C

If a circular chamber is introduced between the casing and the impeller, then casing is known as
(a) vortex casing (b) volute casing (c) casing with guide blades (d) none of the above
Ans:- A

The rotating part of a turbine is known as
(a) Impeller (b) Guide mechanism (c) Runner (d) None of the above
Ans:- A

In case of Kaplan turbine, velocity of flow at inlet is
(a) less than that at outlet (b) more than that at outlet
(c) equal of that at outlet (d) none of the above
Ans:- C


The main advantage of the draft-tube is to convert
(a) pressure energy into kinetic energy
(b) kinetic energy into pressure energy
(c) pressure energy into electrical energy
(d) none of the above
Ans:- B

The pressure at the exist of the runner of a reaction turbine is generally
(a) more than atmospheric pressure
(b) equal to atmospheric pressure
(c) less than atmospheric pressure
(d) none of the above
Ans:- C

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I wanted to prepare for the examination of RRB Junior Engineer? Please provide me the model paper for my better preparation?

As you asking for the question paper of RRB Junior Engineer. here I am providing you .
the question paper of RRB Junior Engineer is given below:



1. Strain is defined as the ratio of
(a) change in volume to original volume
(b) change in length to original length
(c) change in cross-sectional area to original cross-sectional area
(d) any one of the above
(e) none of the above.
Ans: d

2. Hooke's law holds good upto
(a) yield point
(b) limit of proportionality
(c) breaking point
(d) elastic limit
(e) plastic limit.
Ans: b


3. Young's modulus is defined as the ratio of
(a) volumetric stress and volumetric strain
(b) lateral stress and lateral strain
(c) longitudinal stress and longitudinal strain
(d) shear stress to shear strain
(e) longitudinal stress and lateral strain.
Ans: c


4. The unit of Young's modulus is
(a) mm/mm
(b) kg/cm
(c) kg
(d) kg/cm2
(e) kg cm2.
Ans: d


5. Deformation per unit length in the direction of force is known as
(a) strain
(b) lateral strain
(c) linear strain
(d) linear stress
(e) unit strain.
Ans: c


6. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called
(a) Internal resistance
(b) Tensile stress
(c) Transverse stress
(d) Compressive stress
(e) Working stress.

Ans: b
7. The materials having same elastic properties in all directions are called
(a) ideal materials
(b) uniform materials
(c) isotropic materials
(d) practical materials
(e) elastic materials.
Ans: c
8. A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions
noted with increasing loads will behave as under
(a) uniform throughout
(b) increase uniformly
(c) first increase and then decrease
(d) increase uniformly first and then in-crease rapidly
(e) increase rapidly first and then uniformly.
Ans: d
9. Modulus of rigidity is defined as the ratio of
(a) longitudinal stress and longitudinal strain
(b) volumetric stress and volumetric strain
(c) lateral stress and lateral strain
(d) shear stress and shear strain
(e) linear stress and lateral strain.
Ans: d
10. If the radius of wire stretched by a load is doubled, then its Young's modulus will be
(a) Doubled
(b) Halved
(c) become four times
(d) Become one-fourth
(e) Remain unaffected.
Ans: e

rest of the 2questions you may find on the file given below:

Attached Files Available for Download

Model paper of Mechanical of RRB Junior Engineer.pdf (131.5 KB, 27 views)

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I wanted to prepare for the examination of RRB Junior Engineer? Please provide me the model paper for my better preparation?

As you asking for the question paper of RRB Junior Engineer. here I am providing you .the question paper of RRB Junior Engineer is given below:

Answer intro missing


1. Strain is defined as the ratio of
(a) change in volume to original volume
(b) change in length to original length
(c) change in cross-sectional area to original cross-sectional area
(d) any one of the above
(e) none of the above.
Ans: d

2. Hooke's law holds good upto
(a) yield point
(b) limit of proportionality
(c) breaking point
(d) elastic limit
(e) plastic limit.
Ans: b


3. Young's modulus is defined as the ratio of
(a) volumetric stress and volumetric strain
(b) lateral stress and lateral strain
(c) longitudinal stress and longitudinal strain
(d) shear stress to shear strain
(e) longitudinal stress and lateral strain.
Ans: c


4. The unit of Young's modulus is
(a) mm/mm
(b) kg/cm
(c) kg
(d) kg/cm2
(e) kg cm2.
Ans: d


5. Deformation per unit length in the direction of force is known as
(a) strain
(b) lateral strain
(c) linear strain
(d) linear stress
(e) unit strain.
Ans: c


6. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called
(a) Internal resistance
(b) Tensile stress
(c) Transverse stress
(d) Compressive stress
(e) Working stress.

Ans: b
7. The materials having same elastic properties in all directions are called
(a) ideal materials
(b) uniform materials
(c) isotropic materials
(d) practical materials
(e) elastic materials.
Ans: c
8. A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions
noted with increasing loads will behave as under
(a) uniform throughout
(b) increase uniformly
(c) first increase and then decrease
(d) increase uniformly first and then in-crease rapidly
(e) increase rapidly first and then uniformly.
Ans: d
9. Modulus of rigidity is defined as the ratio of
(a) longitudinal stress and longitudinal strain
(b) volumetric stress and volumetric strain
(c) lateral stress and lateral strain
(d) shear stress and shear strain
(e) linear stress and lateral strain.
Ans: d
10. If the radius of wire stretched by a load is doubled, then its Young's modulus will be
(a) Doubled
(b) Halved
(c) become four times
(d) Become one-fourth
(e) Remain unaffected.
Ans: e

11. The ultimate tensile stress of mild steel compared to ultimate compressive stress is

(a) same

(b) more

(c) less

(d) more or less depending on other factors

(e) unpredictable.

Ans: b

12. Tensile strength of a material is obtained by dividing the maximum load during the test by the

(a) area at the time of fracture

(b) original cross-sectional area

(c) average of (a) and (b)

(d) minimum area after fracture

(e) none of the above.

Ans: b

13. The impact strength of a material is an index of its

(a) toughness

(b) tensile strength

(c) capability of being cold worked

(d) hardness

(e) fatigue strength.

Ans: a

14. The Young's modulus of a wire is defined as the stress which will increase the length of wire

compared to its original length

(a) half

(b) same amount

(c) double

(d) one-fourth

(e) four times.

Ans: b

15. Percentage reduction of area in performing tensile test on cast iron may be of the order of

(a) 50%

(b) 25%

(c) 0%

(d) 15%

(e) 60%.

Ans: c

16. The intensity of stress which causes unit strain is called

(a) unit stress

(b) bulk modulus

(c) modulus of rigidity

(d) modulus of elasticity

(e) principal stress.

Ans: d

17. True stress-strain curve for materials is plotted between

(a) load/original cross-sectional area and change in length/original length

(b) load/instantaneous cross-sectional area original area and log.

(c) load/instantaneous cross-sectional area and change in length/original length

(d) load/instantaneous area and instantaneous area/original area

(e) none of the above.

Ans: b

18. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes

and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is

(a) 4 tonnes/cm2

(b) 8 tonnes/cm2
(c) 16 tonnes/cm2

(d) 22 tonnes/cm2

(e) none of the above.

Ans: b

19. For steel, the ultimate strength in shear as compared to in tension is nearly

(a) same

(b) half

(c) one-third

(d) two-third

(e) one-fourth.

Ans: b

20. Which of the following has no unit

(a) kinematic viscosity

(b) surface tension

(c) bulk modulus

(d) strain

(e) elasticity.

Ans: d

21. Which is the false statement about true stress-strain method

(a) It does not exist

(b) It is more sensitive to changes in both metallurgical and mechanical conditions

(c) It gives, a more accurate picture of the ductility

(d) It can be correlated with stress-strain values in other tests like torsion, impact, combined stress

tests etc.

(e) It can be used for compression tests as well.

Ans: a

22. In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile

stress is

(a) more

(b) less

(c) same

(d) more/less depending on composition

(e) may have any value.
Ans: b

23. If a part is constrained to move and heated, it will develop

(a) principal stress

(b) tensile stress

(c) compressive stress

(d) shear stress

(e) no stress.

Ans: c

24. Which of the following materials is most elastic

(a) rubber

(b) plastic

(c) brass

(d) steel

(e) glass.

Ans: d

25. The value of modulus of elasticity for mild steel is of the order of

(a) 2.1xl05 kg/cm2

(b) 2.1 X 106 kg/cm2

(c) 2.1 x 107 kg/cm2

(d) 0.1 xlO6 kg/cm2 (
Ans: b

26. The value of Poisson's ratio for steel is between

(a) 0.01 to 0.1

(b) 0.23 to 0.27

(c) 0.25 to 0.33

(d) 0.4 to 0.6

(e) 3 to 4.

Ans: c

27. The buckling load for a given material depends on

(a) slenderness ratio and area of cross-section

(b) Poisson's ratio and modulus of elasticity

(c) slenderness ratio and modulus of elasticity
(d) slenderness ratio, area of cross-section and modulus of elasticity

(e) Poisson's ratio and slenderness ratio.

Ans: d

28. The total elongation produced in a bar of uniform section hanging vertically downwards due to

its own weight is equal to that produced by a weight

(a) of same magnitude as that of bar and applied at the lower end

(b) half the weight of bar applied at lower end

(c) half of the square of weight of bar applied at lower end

(d) one-fourth of weight of bar applied at lower end

(e) none of the above.

Ans: b

29. The property of a material by virtue of which a body returns to its original, shape after removal

of the load is called

(a) plasticity

(b) elasticity

(c) ductility

(d) malleability

(e) resilience.

Ans: b

30. The materials which exhibit the same elastic properties in all directions are called

(a) homogeneous

(b) inelastic

(c) isotropic

(d) isotropic

(e) relativistic.

Ans: c

31. The value of Poisson's ratio for cast iron is

(a) 0.1 to 0.2

(b) 0.23 to 0.27

(c) 0.25 to 0.33

(d) 0.4 to 0.6

(e) 3 to 4.

Ans: b
32. The property of a material which allows it to be drawn into a smaller section is called

(a) plasticity

(b) ductility

(c) elasticity

(d) malleability

(e) durability.

Ans: b

33. Poisson's ratio is defined as the ratio of

(a) longitudinal stress and longitudinal strain

(b) longitudinal stress and lateral stress

(c) lateral stress and longitudinal stress

(d) lateral stress and lateral strain

(e) none of the above.

Ans: c

34. For which material the Poisson's ratio is more than unity

(a) steel

(b) copper

(c) aluminum

(d) cast iron

(e) none of the above.

Ans: e

35. The property of a material by virtue of which it can be beaten or rolled into plates is called

(a) malleability

(b) ductility

(c) plasticity

(d) elasticity

(e) reliability.

Ans: a

36. The change in the unit volume of a material under tension with increase in its Poisson's ratio

will ,

(a) increase

(b) decrease
(c) remain same

(d) increase initially and then decrease

(e) unpredictable.

Ans: b

37. The percentage reduction in area of a cast iron specimen during tensile test would be of the

order of

(a) more than 50%

(b) 25—50%

(c) 10—25%

(d) 5—10%

(e) negligible.

Ans: e

38. If a material expands freely due to heating it will develop

(a) thermal stresses

(b) tensile stress

(c) bending

(d) compressive stress

(e) no stress.

Ans: e

39. In a tensile test, near the elastic limit zone, the

(a) tensile strain increases more quickly

(b) tensile strain decreases more quickly

(c) tensile strain increases in proportion to the stress

(d) tensile strain decreases in proportion to the stress

(e) tensile strain remains constant.

Ans: a

40. The stress necessary to initiate yielding is

(a) considerably greater than that necessary to continue it

(b) considerably lesser than that necessary to continue it

(c) greater than that necessary to stop it

(d) lesser than that necessary to stop it

(e) equal to that necessary to stop it.

Ans: a

41. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with

the time at a constant load is called

(a) creeping

(b) yielding

(c) breaking

(d) plasticity

(e) none of the above.

Ans: a

42. The stress developed in a material at breaking point in extension is called

(a) breaking stress

(b) fracture stress

(c) yield point stress

(d) ultimate tensile stress

(e) proof stress.

Ans: a

43. Rupture stress is

(a) breaking stress

(b) maximum load/original cross-section¬al area 04)

(c) load at breaking point/A

(d) load at breaking point/neck area

(e) maximum stress.

Ans: d

44. The elasticity of various materials is controlled by its

(a) ultimate tensile stress

(b) proof stress

(c) stress at yield point

(d) stress at elastic limit

(e) tensile stress.

Ans: d

45. The ratio of lateral strain to the linear strain within elastic limit is known as

(a) Young's modulus

(b) bulk modulus

rest of the 2questions you may find on the file given below:

Attached Files Available for Download

Model paper of Mechanical of RRB Junior Engineer.pdf (131.5 KB, 31 views)

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