Engineering Questions with Answers - Multiple Choice Questions
Machine Dynamics MCQ – Gyroscopic Couple
1 - Question
The axis of precession is ____________ to the plane in which the axis of spin is going to rotate.
a) parallel
b) perpendicular
c) spiral
d) none of the mentioned
View Answer
Answer: b
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.
2 - Question
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
a) 1/2 Iω2
b) Iω2
c) 1/2 Iωωp
d) Iωωp
View Answer
Answer: d
Explanation: None
3 - Question
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
a) to dip the nose and tail
b) to raise the nose and tail
c) to raise the nose and dip of the tail
d) to dip the nose and raise the tail
View Answer
Answer: c
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.
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.
4 - Question
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.
a) True
b) False
View Answer
Answer: a
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.
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.
5 - Question
The steering of a ship means
a) movement of a complete ship up and down in vertical plane about transverse axis
b) turning of a complete ship in a curve towards right or left, while it moves forward
c) rolling of a complete ship side-ways
d) none of the mentioned
View Answer
Answer: b
Explanation: The steering is the turning of a complete ship in a curve towards right or left, while it moves forward.
6 - Question
The rolling of a complete ship side-ways is known as pitching of a ship.
a) True
b) False
View Answer
Answer: b
Explanation: The pitching is the movement of a complete ship up and down in a vertical plane about transverse axis.
7 - Question
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
a) to raise the bow and stern
b) to lower the bow and stern
c) to raise the bow and lower the stern
d) to raise the stern and lower the bow
View Answer
Answer: c
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.
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.
8 - Question
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.
a) True
b) False
View Answer
Answer: a
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.
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.
9 - Question
The pitching of a ship is assumed to take place with simple harmonic motion.
a) True
b) False
View Answer
Answer: a
Explanation: None.
10 - Question
When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
a) to move the ship towards star-board
b) to move the ship towards port side
c) to raise the bow and lower the stern
d) to raise the stern and lower the bow
View Answer
Answer: a
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.
When the pitching of a ship is downward, the effect of gyroscopic couple, is to turn the ship towards port side.