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Machine Dynamics Practice Test: Gyroscopic Couple and Precessional Motion
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Gyroscopic Couple and Precessional Motion topics include: Precessional angular motion, gyroscopic couple, effect of gyroscopic couple on aeroplane and naval ship, stability of four wheel and two wheel while taking turns, gyroscopic couple effects. A gyroscopic couple is a force that causes a rotating object to tilt perpendicularly. Precessional motion is the movement that results when an object's axis of rotation changes direction without any external torque applied.  A gyroscopic couple is also known as gyroscopic torque. It's the torque or turning force created by a spinning gyroscope... Show more
Machine Dynamics Practice Test: Gyroscopic Couple and Precessional Motion
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25 Questions

1. The rolling of a complete ship side-ways is known as pitching of a ship.
2. Calculate the work done per minute by a punch tool making 20 working strokes per min when a 30 mm diametre hole is punched in 5 mm thick plate with ultimate shear strength og 450 Mpa in each stroke.
3. During downward pitching, Gyroscopic couple will tend to move the ship towards ________
4. A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, then due to the centrifugal forces
5. In order to maintain contact between inner wheel and ground the sum of vertical reactions at each of the outer and inner wheels should be less than______
6. Calculate the moment of inertia and radius of gyration of a solid sphere of mass 10 kg and diameter 6.5m about its centroidal axis.
7. When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
8. The pitching of the ship is assumed to take place with which of the following motion?
9. Assuming that a vehicle is taking a left turn, The gyroscopic couple acting on the vehicle has a tendency to _____ the inner wheels and ____ the outer wheels.
10. A ship propelled by a turbine rotor which has a mass of 5 tonnes and a speed of 2100 r.p.m. The rotor has a radius of gyration of 0.5 m and rotates in a clockwise direction when viewed from the stern. Find the gyroscopic effect when the ship sails at a speed of 30 km/h and steers to the left in a curve having 60 m radius.
11. Rolling is the turning of a complete ship in a curve towards left or right, while it moves forward.
12. An aeroplane makes a complete half circle of 50 metres radius, towards left, when flying at 200 km per hr. The rotary engine and the propeller of the plane has a mass of 400 kg and a radius of gyration of 0.3 m. The engine rotates at 2400 r.p.m. clockwise when viewed from the rear. Find the gyroscopic couple on the aircraft.
13. The flywheel of an engine has a mass of 200 kg and radius of gyration equal to 1 m. The average torque on the flywheel is 1200 Nm. Find the angular acceleration of flywheel and the angular speed after 10 seconds starting from rest.
14. The steering of a ship means
15. The air screw of an aeroplane is rotating clockwise when looking from the front. If it makes a left turn, the gyroscopic effect will
16. When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
17. Which of the following is known as the axis of precession?
18. Which of the following relation is correct regarding the net gyroscope couple C acting on a four wheel vehicle?
19. 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
20. The positive sign is used to determine the gyroscope couple in which of the following cases?
21. Which of the following quantity represent the gear ratio “G” for a 2 wheeler vehicle? (w: wheels, e: engine, R: radius of track, rw: radius of wheels & I: moment of inertia)
22. In an automobile, if the vehicle makes a left turn, the gyroscopic torque
23. When seen from the top, the gyroscopic couple acting on the disc will act in the clockwise direction.
24. The axis of precession is ____________ to the plane in which the axis of spin is going to rotate.
25. The axis of precession is parallel to axis of spin during rolling for only a selected few positions.