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69.

70.

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75.

The outside diameter of a hollow shaft is double the inside diameter. The ratio of the
torque carrying capacity to that of a solid shaft of the same material and of the same
outside diameter is

A) 1/16 B) 1/2 C) 15/16 D) 3/4

The tearing efficiency of a riveted joint is 80 percent, then the ratio of the rivet hole
diameter to the pitch is equal to
A) 0.25 B) 0.2 C) 0.3 D) 0.4

The principal stresses of a two dimensional state of stress are o , and oo, 6, is greater
than 6, and both are tensile, then which one of the following would be the correct
criterion for failure according to maximum shear stress theory ?

A) 6,/2= toy/2 8) 6, 5 29,

C) 0/2 =+t0,/2 0) (64 - 6)/2 = to/2

The slider 2 moves inwards with a velocity of v along a link 3 which is rotating clockwise
with an angular velocity 0. The magnitude and direction of the Coriolis acceleration is

1

1

5 >= = ے
‎A) ov 8) 20% ©) 0% D) 20%‏

A flywheel connected to a punching machine has to supply energy of 320 Nm which
is running at a mean angular speed of 20 rad/s. If the total fluctuation of speed is not
to exceed + 2%, the mass moment of inertia of the flywheel in kg — m? is

A) 25 B) 20 C) 30 D) 40

The swaying couple is maximum or minimum when the angle of inclination in degrees
of the line of stroke is equal to

A) 180 and 315 B) 225 and 135

C) 225 and 45 D) 180 and 225

With the decrease of governor speed

A) Radius of rotation decreases but the height of it increases
B) Radius of rotation and height of it decreases

C) Radius of rotation and the height of it increases

D) Radius of rotation increases but the height of it increases

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