AE-JE (ME) II Theory of machine Revision Quiz for AE & JE Exams Exams

Question 1

which of the following statements are associated with complete dynamic balancing of rotating systems?
1) Resultant couple due to all inertia forces is zero.
2) Support reactions due to force are zero but not due to couples.
3) The system is automatically statically balanced.
4) Centre of mass of the system lies on the axis of rotation.

Question 2

Consider the following statements:
1) Gyroscopic effects generate forces and couples which act on the vehicles, and these effects must be taken into account while designing their bearings.
2) Rolling motion of a ship usually occurs because of the difference in buoyancy on the two sides of the ship due to a wave.
Which of the above statements is/are correct?

Question 3

A rigid rotor supported on two bearings which are 2.75 m apart, is found to have an unbalanced couple of magnitude 300 N-m. The dynamic reactions at each bearing would be nearly:

Question 4

For the follower with stroke S, following the cycloidal motion, the radius of the rolling circle will be

Question 5

In a crank and slotted lever type quick return mechanism, the link moves with an angular velocity of 20 rad/s, while the slider moves with a linear velocity of 1.5 m/s. The magnitude and direction of Coriolis component of acceleration with respect to angular velocity are

Question 6

What is the number of instantaneous centres of rotation for a 6-link mechanism?

Question 7

In a governor, if the equilibrium speed is constant for all radii of rotation of balls, the governor is said to be

Question 8

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 9

in the case of involute system of gears, if the centre distance is changed

Question 10

Which one of the following statements is correct?
Seismic transducer working in the displacement mode should have

Question 11

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 12

A circular cylinder of mass m and radius r is connected by a spring of modulus K as shown. If it is free to roll on the rough horizontal surface without slipping, what will be its natural frequency?