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ISRO ME 2019 THEORY OF MACHINES 1

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Question 1

For the given four bar linkage, the velocity of B with respect to A will be:-

Question 2

Masses A, B and C are attached to a shaft in a parallel plane and shaft is rotating at 250 rpm as shown in the figure. The mass C is

Question 3

The mass of a turbine rotor is 2.5 tonnes and it rotates at 2000 rpm in clockwise direction when viewed from the rear end. The radius of gyration of the rotor is 300 mm. The gyroscopic couple (in Nm) when the ship turns at a radius of 300 m with a speed of 7 m/s is:

Question 4

A cam follower in which cam is rotating with uniform angular velocity of rad/s and follower moves in SHM. If displacement of the follower is given as

Where is the angle turned by the cam in time t sec
Φ= angle of ascent
s = maximum lift of follower
Find Maximum velocity of cam______

Question 5

A cam with an ascent angle of 120 and maximum displacement of follower of 20 mm is rotating with an angular velocity of 88 rad/s and has a descent and then followed by dwell. If cam follower program has a constant acceleration then find the value of maximum velocity during ascent of the follower (in m/s) ________.

Question 6

Which of the following is a function of oldham’s coupling:

Question 7

In a spring mass system as shown in the figure, the uniform spring has mass ms and stiffness k. The natural frequency of the system will be :

Question 8

Spur gears are used for

Question 9

In a hartnell governor, the mass of each ball is 3 kg. The extreme radii of rotation of the balls are 40 mm and 30 mm and the corresponding maximum and minimum centrifugal forces on the ball are 1500 N and 50 N respectively. Lengths of vertical and horizontal arms of the bell – crank levers are in the ratio of 2:1 . The spring stiffness will be :

Question 10

Match list I (terms) with list II (definition) and select the correct answer using the codes given below the lists:
List I
A) Base circle
B) Trace point
C) Pitch point
D) Prime circle
List II
I. Smallest circle that can be draw from the centre of cam and tangent to pitch curve
II. Smallest circle that can be draw from the centre of cam through the pitch points
III. Point on pitch curve having the maximum pressure angle
IV. Point on pitch curve having the minimum pressure angle
V. Smallest circle that can be draw to the cam profile
VI. Reference point on follower and used to generate pitch curve
Codes:
A B C D
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