Machine Dynamics

Gyroscopic Couple

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The axis of precession is ____________ to the plane in which the axis of spin is going to rotate.
parallel
perpendicular
spiral
none of the mentioned
Explanation:
The axis of precession is perpendicular to the plane in which the axis of spin is going to rotate. The gyroscopic principle is used in an instrument or toy known as gyroscope.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be
1/2 Iω2
Iω2
1/2 Iωωp
Iωωp
Explanation:
None
Question 3
Marks : +2 | -2
Pass Ratio : 100%
The rolling of a complete ship side-ways is known as pitching of a ship.
True
False
Explanation:
The pitching is the movement of a complete ship up and down in a vertical plane about transverse axis.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the right. The effect of gyroscopic couple on the aeroplane will be to dip the nose and raise the tail.
True
False
Explanation:
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 gyroscopic couple on the aeroplane will be to raise the nose and dip of the tail.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be
to raise the bow and stern
to lower the bow and stern
to raise the bow and lower the stern
to raise the stern and lower the bow
Explanation:
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be to raise the bow and lower the stern.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
to move the ship towards star-board
to move the ship towards port side
to raise the bow and lower the stern
to raise the stern and lower the bow
Explanation:
When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be to move the ship towards star-board.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
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 gyroscopic couple on the aeroplane will be
to dip the nose and tail
to raise the nose and tail
to raise the nose and dip of the tail
to dip the nose and raise the tail
Explanation:
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 gyroscopic couple on the aeroplane will be to raise the nose and dip of the tail.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The steering of a ship means
movement of a complete ship up and down in vertical plane about transverse axis
turning of a complete ship in a curve towards right or left, while it moves forward
rolling of a complete ship side-ways
none of the mentioned
Explanation:
The steering is the turning of a complete ship in a curve towards right or left, while it moves forward.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
The pitching of a ship is assumed to take place with simple harmonic motion.
True
False
Explanation:
None.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
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.
True
False
Explanation:
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be to raise the bow and lower the stern.