GATE PI topic:theory-machines-design PYQs & Answers — Page 2

Questions 11–19 of 19. Imported answers require independent review unless marked reviewed.

A M30 bolt needs to be subjected to pretension

kN. If the torque coefficient

for the bolt is 0.2, then the torque in Nm needed to achieve this pretension is ____________. [in integer]

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A 150 mm wide polyamide flat belt is transmitting 15 kW power through a belt-pulley system. The driving pulley of 150 mm pitch diameter is rotating at 200 RPM. If

is the belt tension on high tension side, and

is the belt tension on low tension side, then the difference in belt tensions

in N is ____________. [round off to one decimal place]

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The figure shows a mechanism with 3 revolute pairs (between the links 1 and 2, 2 and 3, and 3 and 4) and a prismatic pair (between the links 1 and 4). Which one of the four links should be fixed to obtain the mechanism that forms the basis of the quick-return mechanism widely used in a shaper?

Diagram for Production and Industrial Engineering question 8

Your answerChoose one option.

Link 1

Link 2

Link 3

Link 4

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A solid shaft has to transmit 50 kW of power at a speed of 190 RPM. Ignore any possible bending of the shaft. The maximum allowable shear stress for the material of the shaft is 80 MPa. The minimum diameter of the shaft required to prevent failure due to shear (rounded off to one decimal place) in cm is __________.

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A flywheel is to be used in an IC engine to limit fluctuation of angular speed. The average of the maximum and the minimum angular speed is 500 RPM, and the maximum fluctuation of energy is 10,000 N-m. Neglecting rotary inertia of any other components, the moment of inertia of the flywheel about its axis of rotation required to limit the maximum fluctuation of speed to 30 RPM (rounded off to one decimal place) in kg-m

is __________.

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The link lengths of a planar four bar mechanism are

mm,

mm and

mm. For achieving the full rotation of both the input (crank) as well as the output (follower) links, the link that needs to be fixed is

Your answerChoose one option.

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A cam is designed to achieve a simple harmonic motion of a flat-faced follower. Starting from the rest, the follower rises to the maximum height of 50 mm at 180° of cam rotation as shown in the figure.

Diagram for Production and Industrial Engineering question 44

If the cam rotates at a uniform angular speed of 100 rpm, the speed of the follower (in mm/s) at the instance when the cam rotates 45° from the initial position is ______

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A flywheel in the form of a solid circular disc of radius 100 mm and uniform thickness has a mass of 10 kg. If it is rotating at a uniform angular velocity of 20 rad/s, the kinetic energy (in J) of the flywheel is ______

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A pair of spur gears with 20° full-depth involute teeth is used to transmit 3.5 kW of power. The pinion rotates at 700 rpm and has pitch circle diameter of 100 mm. Assuming a single pair of teeth in contact, the total force acting on a gear tooth (in kN) is

Your answerChoose one option.

0.347

0.954

1.016

1.302

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GATE PI topic:theory-machines-design PYQs

Question 20

Question 21

Question 8

Question 37

Question 38

Question 7

Question 44

Question 19

Question 32