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97.

An elevator weighing 10000 N attains an upward velocity of 4 m/s in 2s with uniform acceleration. Then what is the tension in the wire rope?
(a) 8000 N
(b) 5000 N
(c) 2500 N
(d) 12000 N

asked in Mechanical Paper-2, 2009

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98.

Maximum shear stress developed on the surface of a solid circular shaft under pure torsion is 240 MPa. If the shaft diameter is doubled, then what is the maximum shear stress developed corresponding to the same torque?
(a) 120 MPa
(b) 60 MPa
(c) 30 MPa
(d) 15 MPa

asked in Mechanical Paper-2, 2009

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99.

Fatigue strength of a rod subjected to cyclic axial force is less than that of a rotating beam of the same dimensions subjected to steady lateral force. What is the reason?
(a) Axial stiffness is less than bending stiffness
(b) Absence of centrifugal effects in the rod
(c) The number of discontinuities vulnerable to fatigue is more in the rod
(d) At a particular time, the rod has only one type of stress whereas the beam has both tensile and compressive stresses

asked in Mechanical Paper-2, 2009

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100.

A spur gear transmits 10 kW at a pitch line velocity of 10 m/s; driving gear has a diameter of 1.0 m. Find the tangential force between the driver and the follower, and the transmitted torque respectively.
(a) 1 kN and 0.5 kN-m
(b) 10 kN and 5 kN-m
(c) 0.5 kN and 0.25 kN-m
(d) 1 kN and 1 kN-m

asked in Mechanical Paper-2, 2009

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101.

A power screw of 32 mm nominal diameter and 5 mm pitch is acted upon by an axial load of 12 kN. Permissible thread bearing pressure is 6 MPa. Considering bearing action between the threads in engagement, what is the number of threads in engagement with the screw?
(a) 6
(b) 7
(c) 9
(d) 10

asked in Mechanical Paper-2, 2009

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102.

Consider the following joints:
1. Railway carriage wheel and axle
2. IC engine cylinder and linear
Which of the above joints is/are interference fit?
(a) 1 only
(b) 2 only
(c) Neither 1 nor 2
(d) Both 1 and 2

asked in Mechanical Paper-2, 2009

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