RRB JE MIXED QUESTIONS 3
1. Which of the following device is not used to measure the rate of flow?
(a) Venturimeter
(b) Pitot tube
(c) Orificemeter
(d) Rotameter
Answer: B
2. Equation of continuity is based on the principle of conservation of
(a) Mass
(b) Energy
(c) Momentum
(d) Time
Answer: B
3. An aeroplane works onย
(a) Archimedes principle
(b) Pascal’s law
(c) Bernoulli’s principle
(d) Stoke’s law
Answer: C
4. A liquid undergoing a rigid body rotation in a container is said to have
(a) Forced vortex motion
(b) Circulation
(c) Free vortex motion
(d) Translation
Answer: A
5. The formation of bubbles of vapour in a flowing fluid is called as
(a) Cavitation
(b) Corrosion
(c) Gasification
(d) Boiling
Answer: A
6. A liquid forms an interface with another liquid or gas; the surface energy per unit area of the interface is known as
(a) Surface tension
(b) Specific energy
(c) Specific heat
(d) Suction energy
Answer: A
7. In fluid flow , the line of constant piezometric head passes through two points which have the same
(a) Elevation
(b) Pressure
(c) Velocity
(d) Velocity potential
ย Answer: C
8. A man is standing on a boat in still water . If he walks in the boat towards the shore , the boat will
(a) Move away from the shore
(b) Remain stationary
(c) Move towards the shore
(d) Sink
Answer: A
9. The clearance ratio for a single stage compressor lies between
(a) 15% and 20%
(b) 1% and 2%
(c) 4% and 10%
(d) 20% and 30%
Answer: C
10. Discharge of centrifugal pump is
(a) Directly proportional to the square of speed of its impeller
(b) Inversely proportional to the speed of its impeller
(c) Inversely proportional to the square of speed of its impeller
(d) Directly proportional to the speed of its impeller
Answer: D
11. The ratio of theoretical power that must be supplied to operate the pump to the actual power delivered to the pump is
(a) Mechanical efficiency
(b) Hydraulic efficiency
(c) Overall efficiency
(d) Volumetric efficiency
Answer: A
12. Water hammer pressure is relieved by
(a) Penstock
(b) Draft tube
(c) Turbine
(d) Surge tank
Answer: D
13. A positive displacement pump has an overall efficiency of 88% and a volumetric efficiency of 92% . What is the mechanical efficiency?
(a) 95.65%
(b) 40%
(c) 88%
(d) 4.34%
Answer: A
14. The function of sluice valve provided in pipe line is
(a) To reduce the chances of pollution reaching into the pipe
(b) To reduce the pressure on pipes
(c) To regulate the flow of water through the pipes
(d) To allow the air to enter the pipe
Answer: C
15. Cavitation is primarily associated with which of the following fluid properties
(a) Specific gravity
(b) Surface tension
(c) Viscosity
(d) Vapour pressure
Answer: D
16. The compressor performance at higher altitude compared to sea level will be
(a) The same
(b) Higher
(c) Dependent on other factors
(d) Lower
Answer: D
17. Which of the following is a high head turbine
(a) Propeller turbine
(b) Francis turbine
(c) Kaplan turbine
(d) Pelton wheel turbine
Answer: D
18. Turbine used for low head is
(a) Kaplan turbine
(b) Francis turbine
(c) Pelton Wheel turbine
(d) Propeller turbine
Answer: A
19. In a building , water is to be pumped to a height of 10m at the rate of 1 litre/sec . Power requirement would be approx:(Take ‘g’ 10m/secยฒ)
(a) 10 Watts
(b) 100 Watts
(c) 500 Watts
(d) 1 kW
Answer: B
20. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction . This is known as –
(a) Principle of resolution of forces
(b) Principle of independence of forces
(c) Principle of transmissibility of forces
(d) All of the options
Answer: A
21. If the line of action of all the forces are along the same line , then the forces are said to be-
(a) Coplanar parallel forces
(b) Non – coplanar non – concurrent forces
(c) Collinear forces
(d) Coplanar concurrent forces
Answer: C
22. Which of the following on can be used to determine distance or displacement traveled by a body directly?
(a) vยฒ – uยฒ = 2as
(b) v = u + at
(c) s = ut + ยฝ atยฒ
(d) Both v = u + at and s = ut + ยฝ atยฒ
Answer: D
23. The area under the stress – strain plot (product of stress and strain) represents
(a) Hardness of the material
(b) Energy required to cause failure
(c) Rigidity of the material
(d) Flexibility of the material
Answer: B
24. Which of the following formulae represents that the given frame is a perfect frame?
(a) n = (j – 3)
(b) n = (2 – j)
(c) n = (2j – 3)
(d) n = (3j – 2)
Answer: C
25. If ‘F’ is the force acting on the body , ‘m’ is the mass of the body and ‘a’ is the acceleration of the body , then which of the following is true according to Newton’s second law of motion?
(a) F + ma = 0
(b) F (ma) = 0
(c) F – ma = 0
(d) F/ma = 0
Answer: C
26. In a screw jack , the effect required to lift the load is given by; (where , W = Load Lifted , ฮฑ = Helix angle , and ฯ = Angle of friction)
(a) P = W tan (ฮฑ – ฯ)
(b) P = W cos (ฮฑ + ฯ)
(c) P = W tan (ฮฑ + ฯ)
(d) P = W tan (ฯ – ฮฑ)
Answer: D
27. According to the principle of moments –
(a) If a system of coplanar forces is in equilibrium , then the algebraic sum of their moments points in their plane is zero
(b) Positive and negative couples can be balanced
(c) The algebraic sum of the moments of any forces about any point is equal to the moment of the resultant about the same point
(d) If a system of coplanar forces is in equilibrium , then their algebraic sum is zero
Answer: A
28. A couple produces _____ type of motion .
(a) Translatory
(b) Combination of translatory and rotational
(c) Rotational
(d) Reciprocating
Answer: C
29. The total momentum of a system of masses (i.e. moving bodies) in any one direction remains constant , unless acted upon by an external force in that direction . This statement is called –
(a) Law of transmissibility of forces
(b) Principle of conservation of energy
(c) Newton’s first law of motion
(d) Principle of conservation of momentum
Answer: D
30. “If no external torque acts on a rigid body , then the product of its moment of inertia and the angular velocity about the axis of rotation must remain constant” is the statement of –
(a) Law of polygon of forces
(b) Law of parallelogram forces
(c) Law of triangular forces
(d) Law of conservation of Angular momentum
Answer: D
31. The rate of change of displacement of a body is called –
(a) Impulse
(b) Momentum
(c) Acceleration
(d) Velocity
Answer: D
32. The force applied on a body of mass 236 kg to produce an acceleration of 4 m/sยฒ is-
(a) 944 N
(b) 59 N
(c) 118 N
(d) 472 N
Answer: A
33. In which of the following case we avoid bolted connection
(a) Connection subjected to fire
(b) Connection subjected to frequent earthquake load
(c) Connection subjected to snow load
(d) Connection subjected to corrosion problem
Answer: B
34. The minimum angle made by an inclined plane with the horizontal such that an object placed on the inclined surface just begins to slide is called –
(a) Angle of elevation
(b) Angle of friction
(c) Angle of latitude
(d) Angle of Repose
Answer: D
35. Which of the following is incorrect in the laws of dry friction?
(a) The frictional force always acts in a direction opposite to that in which the body tends to move
(b) The force of friction is dependent of the area of contact between the two surfaces
(c) The force of friction depends upon the roughness/smoothness of the surfaces
(d) The magnitude of the limiting friction bears a constant ratio to the normal reaction between the two contacting surfaces
Answer: B
36. Three forces acting on a rigid body are represented in magnitude , direction and line of action by the three sides of a triangle taken in order the forces are equivalent to a triangle taken in order . The forces are equivalent to a couple whose moment is equal to –
(a) Thrice the area of the triangle
(b) The area of the triangle
(c) Half the area of the triangle
(d) Twice the area of the triangle
Answer: D
37. According to the law of moments , if a number of coplanar forces acting on a particle are in equilibrium , then –
(a) The algebraic sum of their moments about any point in their plane is zero
(b) Their algebraic sum is zero
(c) The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
(d) Their lines of action are at equal distances
Answer: C
38. A block weighing W = 20 kN is resting on an inclined place which makes an angle of 30ยฐ to the horizontal . The component of gravity force parallel to inclined plane is –
(a) 17.32 kN
(b) 10 kN
(c) 14.14 kN
(d) 5 kN
Answer: B
39. A channel section consists of
(a) Two webs
(b) Two flanges
(c) Two webs and two flanges
(d) One web and two flanges
Answer: D
40. For perfectly elastic bodies , the value of coefficient of restitution is:
(a) Zero
(b) 0.5
(c) 1.0
(d) 0.25
Answer: C
41. If p is the pitch of the rivets and d is the across diameter of rivets , the tearing efficiency of joints is equal to
(a) p/(p – d)
(b) p/(p + d)
(c) (p – d)/p
(d) (p + d)/p
Answer: C
42. An example of rotational motion is-
(a) Movement of drawer of a table
(b) Spinning of earth
(c) Motion of earth around the sun
(d) Movement of a car on a straight road
Answer: B
43. The material which exhibits the same elastic properties in all directions is called –
(a) Isentropic
(b) Homogeneous
(c) Inelastic
(d) Isotropic
Answer: D
44. The stiffness is the ability of a material to resist –
(a) Externally applied forces with breakdown or yielding
(b) Fracture due to high impact loads
(c) Deformation under stress
(d) To relieved internal stress
Answer: C
45. When a body is subjected to two equal and opposite pulls , as a result of which the body tends to extend its length , the stress and strain induced are-
(a) Compressive stress and tensile strain
(b) Tensile stress and tensile strain
(c) Compressive stress and compressive strain
(d) Tensile stress and compressive strain
Answer: B
46. Which of the following is a slow rise of plastic deformation under the action of stresses?
(a) Brittle fracture
(b) Ductile fracture
(c) Creep
(d) Fatigue
Answer: C
47. The unit of modulus of rigidity is the same as those of-
(a) Stress , pressure and modulus of elasticity
(b) Stress , force and modulus of elasticity
(c) Strain , force and pressure
(d) Stress , strain and pressure
Answer: A
48. The ultimate strength of the steel used for prestressing is nearly
(a) 250 N/mmยฒ
(b) 415 N/mmยฒ
(c) 500 N/mmยฒ
(d) 1500 N/mmยฒ
Answer: D
49. The ratio of transverse strain to the longitudinal strain under an axial load is known as
(a) Tangent modulus of elasticity
(b) Bulk modulus of elasticity
(c) Modulus of rigidity
(d) Poisson’s ratio
Answer: D
50. A prismatic beam has uniform
(a) Depth
(b) Width
(c) Strength
(d) Cross – section
Answer: D
51. Cup-and-cone type fracture occurs in the case of
(a) Cast iron
(b) Round specimen of ductile metals
(c) Tough Steel
(d) Soft brass
Answer: B
52. The unit of elastic modulus is the same as those of
(a) Stress , shear modulus and pressure
(b) Strain , shear modulus and force
(c) Shear modulus , stress and force
(d) Stress strain and pressure
Answer: A
53. The stress below which a material has a high probability of not failing under reversal of stress is known as
(a) Tolerance limit
(b) Elastic limit
(c) Proportional limit
(d) Endurance limit
Answer: D
54. The term nominal stress in stress-strain curve for mild steel implies
(a) Average stress
(b) Actual stress
(c) Yield stress
(d) Stress at necking
Answer: A
55. If the modulus of elasticity is zero , the material is said to be
(a) Rigid
(b) Elastic
(c) Flexible
(d) Plastic
Answer: D
56. If a material has identical properties in all directions , it is said to be
(a) Homogeneous
(b) Isotropic
(c) Elastic
(d) Orthotropic
Answer: B
57. The negative ratio of transverse to axial strain is called as
(a) Young’s modulus
(b) Shear modulus
(c) Poisson’s ratio
(d) Bulk modulus of elasticity
Answer: C
58. If a material shows different properties in different directions , then it is called as
(a) Isotropic
(b) Homogeneous
(c) Anisotropic
(d) Heterogeneous
Answer: C
59. The phenomenon of increase in stress with increase in strain beyond yielding is called as
(a) Plastic hinge formation
(b) Strain hardening
(c) Strain softening
(d) Yielding
Answer: B
60. The behaviour shown by some materials by virtue of which , as the shear stress reduces continuously with the development in the plastic strain is called as:
(a) Yielding
(b) Strain softening
(c) Strain hardening
(d) Plasticity
Answer: B
61. The stress below which a material regains its original size and shape when the load is removed is called as:
(a) Failure stress
(b) Shrinkage limit
(c) Plastic limit
(d) Elastic limit
Answer: D
62. In S.I. system , unit of stress is:
(a) kg/cmยฒ
(b) N
(c) N/mยฒ
(d) Watt
Answer: C
63. In C.G.S system , the unit of strain is:
(a) cm/kg
(b) m/kg
(c) no unit
(d) None of these
Answer: C
64. The length of a bar is L metres . It extends by 2mm when a tensile force F is applied . Find the strain produced in the bar?
(a) 0.002/L
(b) 2/L
(c) 0.2/L
(d) L/0.002
Answer: A
65. Choose the option which correctly shows that relationship between Modulus of Elasticity (E) ; Modulus of Rigidity (C) and Bulk Modulus (K):
(a) E = KC/K + C
(b) E = KC/2K + C
(c) E = 9KC/3K + C
(d) E = 3KC/K + 2C
Answer: C
66. In therm of bulk modulus (K) and modulus of rigidity (K) , Poisson’s ratio can be expressed as
(a) 3K – 4G/6K – 4G
(b) 3K + 4G/6K – 4G
(c) 3K – 2G/6K + 2G
(d) 3K + 2G/6K – 2G
Answer: C
67. For rivet diameter upto 24 mm. the diameter of rivet hole is larger than the diameter of rivet by
(a) 1 mm
(b) 1.5 mm
(c) 2 mm
(d) 2.5 mm
Answer: B
68. What is the radius of Mohr’s circle in case of bi-axial state of stress?
(a) Half the sum of the two principal stresses
(b) Half the difference of the two principal stresses
(c) Difference of the two principal stresses
(d) Sum of the two principal stresses
Answer: B
69. Bolts are most suitable to carry
(a) Shear
(b) Bending
(c) Axial tension
(d) Shear and bending
Answer: C
70. When a rectangular beam is loaded vertically downwards , the maximum compressive stress is developed on the-
(a) Bottom layer
(b) Every cross section
(c) Top layer
(d) Neutral axis
Answer: A
71. The maximum bending moment of the centre of laminated spring of span L due to load W is given by-
(a) WL/4
(b) WL
(c) WL/6
(d) WL/2
Answer: A
72. The bending moment at a section of a beam will have its local maximum where the shear force is-
(a) Unity
(b) Zero
(c) Maximum
(d) Minimum
Answer: B
73. What is the expansion of UDL in the beams?
(a) Uniformly Distributed Load
(b) Under Depending Load
(c) Uneven Distributed Load
(d) United Decreasing Load
Answer: A
74. The point where the bending moment is zero is called as
(a) Point of contraflexure
(b) Yield point
(c) Plastic hinge
(d) Limit of elasticity
Answer: A
75. A non-yielding support has
(a) Zero slope at the end point (support point)
(b) No bending moment
(c) Can support any amount of vertical load
(d) Frictionless
Answer: A
76. Regarding the idealization of support to a structural system , which of the following is false
(a) Roller supports are free to rotate and translate along the surface upon which the roller rests .
(b) A pinned support can resist both vertical and horizontal forces but not a moment
(c) Fixed supports can resists vertical and horizontal forces as well as a moment
(d) Rigid supports can resist translation , but not the moments
Answer: D
77. A simple supported beam of length L is loaded with a uniformly distributed load of w per unit length . The maximum bending moment will be:
(a) wLยฒ/4
(b) wLยฒ/8
(c) wLยฒ/2
(d) wLยฒ
Answer: B
78. ______ is a beam with one end fixed and the other end simple supported .
(a) Propped cantilever beam
(b) Fixed beam
(c) Continuous beam
(d) Over – hanging beam
Answer: A
79. The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X – X axis passing through centre is –
(a) 20 cm^4
(b) 16 cm^4
(c) 12 cm^4
(d) 9 cm^4
Answer: B
80. The Hoop stress developed in the thin cylinders is given by-
(where , p = Internal pressure , d = Internal diameter and I = wall thickness)
(a) pd/2t
(b) pd/t
(c) pd/4t
(d) pd/3t
Answer: A
81. The section modulus is denoted by –
(a) Z
(b) M
(c) Y
(d) I
Answer: A
82. The maximum bending stress in a curved beam having symmetrical section always occurs at the-
(a) Inside fibre
(b) Neutral axis
(c) Outside fibre
(d) Centroidal axis
Answer: A
83. In the case of pure bending , the beam will bend into an arc of aย
(a) Circle
(b) Parabola
(c) Ellipse
(d) Hyperbola
Answer: A
84. Deep beams are designed for
(a) Shear force only
(b) Bending moment only
(c) Both Shear force and bending moment
(d) Bearing
Answer: B
85. Bending , compressive and tensile stresses respectively are calculated based on
(a) Net area and gross area
(b) Gross area and net area
(c) Net area in both cases
(d) Gross area in both cases
Answer: B
86. In a three-hinged arch , the Bending Moment will be zero at:
(a) Right Hinge only
(b) Left Hinge only
(c) Both Right and Left Hinges
(d) All the three Hinges
Answer: D
87. In a Cantilever beam carrying gravity load , main reinforcement to resist Bending moment in provided
(a) Above the Neutral Axis
(b) As vertical stirrups
(c) As a helical reinforcement
(d) Below the Neutral Axis
Answer: A
88. In a situation where torsion is dominant , which one of the following is the desirable section?
(a) Angle Section
(b) Channel Section
(c) I-Section
(d) Box – Type Section
Answer: D
89. The product of area and square of distance of centre of gravity of the area from the axis is known as –
(a) First moment of area
(b) Second moment of area
(c) Mass moment of inertia
(d) Second moment of mass
Answer: B
90. Euler’s formula holds good only for
(a) Long columns
(b) Weak columns
(c) Both short and long columns
(d) Short columns
Answer: A
91. Lacings are subjected to
(a) Transverse loading
(b) Axial loading plus bending
(c) Axial loading plus shear force
(d) Axial loading only
Answer: C
92. The type of stress induced in the foundation bolts fixing a column to its footing is
(a) Pure compression
(b) Bearing
(c) Pure tension
(d) Bending
Answer: C
93. A column is a structural member designed primarily to take which of the following type of load
(a) Torsional
(b) Tensile
(c) Compressive
(d) Shear
Answer: C
94. In the design of steel structures , the ratio of the effective length of a member to the radius of gyration of the cross-section about the axis under consideration is called as
(a) Modulus of elasticity
(b) Slenderness ratio
(c) Stress ratio
(d) Aspect ratio
Answer: B
95. The effective length of a h meter high column with one end fixed and other free is
(a) 2h
(b) 0.5h
(c) h
(d) h/1.414
Answer: A
96. The load at which an element , a member or a structure as a whole , either collapses in service or buckles in a load test and develops excessive lateral (out of plane) deformation or instability is called as
(a) Buckling load
(b) Yielding load
(c) Eccentric load
(d) Failure load
Answer: C
97. The failure of column depends upon
(a) Weight of column
(b) Length of column
(c) Slenderness ratio
(d) Cross sectional area of column
Answer: C
98. The slenderness ratio of compression member is:
(a) Effective length/Least radius of gyration
(b) Actual length/Moment of inertia
(c) Moment of inertia/Actual length
(d) Actual length/Radius of gyration
Answer: A
99. A structure has two degree of indeterminacy . The number of plastic hinges that would be formed at complete collapse is
(a) 0
(b) 1
(c) 2
(d) 3
Answer: D
100. The torsional rigidity of a shaft is expressed by the-
(a) Maximum torque the shaft can transit
(b) Torque required to produce a twist of one radian per unit length of shaft
(c) Maximum power it can transit at the fastest speed
(d) Fastest speed it can run
Answer: C
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