s. Y. b. TECH. KTOM

A disc spinning on its axis at 20 rad/s will undergo precession when a torque 100 N-m is applied about

an axis normal to it at an angular speed, if mass moment of inertia of the disc is the 1 kg-m2

• (a) 2 rad/s

• (b) 5 rad/s

• (c) 10 rad/s

• (d) 20 rad/s

The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane

takes a turn to the left. The effect of the gyroscopic couple on the aeroplane will be

• (a) to raise the nose and dip the tail

• (b) to dip the nose and raise the tail

• (c) to raise the nose and tail

• (d) to dip the nose and tail

The air screw of an aeroplane is rotating clockwise when looking from the front. If it makes a left turn,

the gyroscopic effect will

• (a) tend to depress the nose and raise the tail

• (b) tend to raise the nose and depress the tail

• (c) tilt the aeroplane

• (d) none of the above

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

• (a) to move the ship towards port side

• (b) to move the ship towards star-board

• (c) to raise the bow and lower the stern

• (d) to raise the stern and lower the bow

The axis of spin, the axis of precession and axis of applied gyroscopic couple are contained in

• a) One plane

• b) Two plane perpendicular to each other

• c) Three planes perpendicular to one another

• d) None of the above

The magnitude of gyroscopic couple applied to a disc of moment of inertia I, spinning with an angular velocity w, and having an angular velocity of precession w_P is

• a) I²w w_p

• b) Iw²w_p

• c) Iw w_p²

• d) Iww_p

A disc spinning on its axis at 20 rad/s will undergo precession when a torque 100 N-m is applied about an axis normal to it at an angular speed, if mass moment of inertia of the disc is the 1 kg-m2

• (a) 2 rad/s

• b) 5 rad/s

• (c) 10 rad/s

• (d) 20 rad/s

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

• (a) to move the ship towards port side

• (b) to move the ship towards star-board

• (c) to raise the bow and lower the stern

• (d) to raise the stern and lower the bow