ESE ME 2018: Theory of Machines Achievers National Test for ESE & GATE ME Exams

Question 1

Consider the following statments regarding a stepper motor :
1) The rotation angle of the motor is proportional to the input pulse.
2) The motor has full torque at standstill
3) Speed and electric control signal of the motor vary mutually linearly.
Which of the above statement are correct?

Question 2

In a vibrating system the spring has stiffness 32 N/m and the mass 2 kg. The system is having a damper whose coefficient of viscous damping is 8 N-s/m. The system is :

Question 3

Consider the following statements:
Helical gears may be designed in applications where gears are to be mounted on
1) Non-parallel shafts.
2) Parallel shafts.
3) Intersecting shafts.
4) Non-parallel and non-intersecting shafts.
Which of these statements is/are correct?

Question 4

Consider the following statements:
1) The degree of freedom for lower kinematic pairs is always equal to one.
2) A ball-and-socket joint has 3 degree of freedom and is a higher kinematic pair
3) Oldham’s coupling mechanism has two prismatic pairs and two revolute pairs.
Which of the statements given above is/are correct?

Question 5

A riveting machine is driven by a constant-torque 3 kW motor. The moving parts including the flywheel are equivalent to 150 kg at 0.6 m radius. One riveting operation takes 1 second and absorbs 10000 N-m of energy. The speed of the flywheel is 300 r.p.m. before riveting. What is the speed (to nearest 10 r.p.m.) after riveting and what is the number of rivets that can be closed per minute?

Question 6

Coriolis component of acceleration depends on
1) angular velocity of the link
2) acceleration of the slider
3) angular acceleration of the link
Which of the above is/are correct?

Question 7

A ball is thrown upwards and it returns to the around describing a parabolic path which of the following remains constant?

Question 8

A cam is a mechanical member used to impart a desired motion to a follower by direct contact. Which one of the under-listed follower motion types will produce the least jerk to the system?

Question 9

What will be the approximate mean speed of flywheel having moment of inertia 9.8 kg m² that varies 60 rpm for fluctuating energy of 1274 joules?

Question 10

The example of the Spring-loaded Governor is __________.

Question 11

While calculating the natural frequency of a spring- mass system, the effect of the mass of the spring is accounted for by adding X times its value of the mass, where X is

Question 12

In a Spring-Mass-Damper system, if mass is m, viscous damping constant is c, stiffness is k and applied force is F(t) in case of free damped vibration, then the correct expression is:

Question 13

which one of the following is the correct value of the natural frequency

of the system given below?

Question 14

Match List-I (Type of Gears) with List-II (characteristics) and select the correct answer using the code given below the lists:
List-I
A) Helical gearing
B) Herringbone gearing
C) Worm gearing
D) Hypoid gearing
List-II
1) Zero axial thrust
2) Non-inter-changeable
3) Skew shafts
4) Parallel shafts

Question 15

When the engine is running at 750 rpm, the magnitude of primary forces is observed to be 500 N. If the crank and connecting rod are of lengths, 250 mm and 1000 mm, respectively, the magnitude of secondary force would be: