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109.

In a Hartnell governor, the mass of each ball is 2.5 kg. Maximum and minimum centrifugal forces on the balls are 2000 N and 100 N corresponding to radii 20 cm and 15 cm respectively. Lengths of vertical and horizontal arms of the bell-crank levers are the same, then what is the spring stiffness in N/cm?
(a) 760
(b) 200
(c) 400
(d) 800

asked in Mechanical Paper-2, 2009

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110.

The given figure shows the turning moment diagram of an engine. The mean speed of prime mover is 2π rad/s and the mass moment of inertia is 0.1 kg-m², then what is the coefficient of fluctuation of energy?

(a) 1%
(b) 5%
(c) 7.5%
(d) 10%

asked in Mechanical Paper-2, 2009

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111.

In a flywheel, the safe stress is 25.2 MN/m² and the density is 7 g/cm³. Then what is the maximum peripheral velocity?
(a) 300 m/s
(b) 45 m/s
(c) 60 m/s
(d) 120 m/s

asked in Mechanical Paper-2, 2009

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112.

A machine is coupled to a power source. The machine requires constant torque but torque supplied by the power source is (800 +200 sinθ) N-m. Mass moment of inertia of the flywheel is 400 kg-m². What is the maximum angular acceleration of the flywheel and at what position does it occur?
(a) 0.5 rad/s² at θ = 90°
(b) 1.0 rad/s² at θ = 90°
(c) 0.5 rad/s² at θ = 180°
(d) 2.0 rad/s² at θ = 90°

asked in Mechanical Paper-2, 2009

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113.

A gear having 100 teeth is fixed and another gear having 25 teeth revolves around it, centre lines of both the gears being jointed by an arm. How many revolutions will be made by the gear of 25 teeth for one revolution of arm?
(a) 3
(b) 4
(c) 5
(d) 6

asked in Mechanical Paper-2, 2009

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114.

An external gear with 60 teeth meshes with a pinion of 20 teeth, module being 6 mm. What is the centre distance in mm?
(a) 120
(b) 180
(c) 240
(d) 300

asked in Mechanical Paper-2, 2009

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