Theory of Machines MCQ with Answers

31) The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.

Answer is:

Agree

32) The sliding pairs, turning pairs and screw pairs form lower pairs.

Answer is:

Right

33) When a particle moves round the circumference of a circle of radius r with ? rad/s, then its maximum acceleration is ?²r.

Answer is:

Right

34) The static friction

Answer is:

all of the above

Explanation:

The static friction
* bears a constant ratio to the normal reaction between the two surfaces
* is independent of the area of contact, between the two surfaces
* always acts in a direction, opposite to that in which the body tends to move

35) A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 1

Answer is:

31) The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.

Agree

32) The sliding pairs, turning pairs and screw pairs form lower pairs.

Right

33) When a particle moves round the circumference of a circle of radius r with ? rad/s, then its maximum acceleration is ?2r.

Right

34) The static friction

all of the above

35) A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 1

2.22 mm

33) When a particle moves round the circumference of a circle of radius r with ? rad/s, then its maximum acceleration is ?²r.