Dynamics of Machinery (3151911) MCQs

MCQs of Gyroscope

Showing 41 to 40 out of 50 Questions
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41.

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)

(a)

ωw / ωe
(b)

ωe / ωw
(c)

rw / R
(d)

Ie / Iw
Answer:

Option (b)

42.

Which of the following is correct regarding the angle of heel?

(a)

It is the inclination of the vehicle to the vertical for equilibrium
(b)

It is the inclination of the vehicle to the horizontal for equilibrium
(c)

It is the angle between the axis of gyroscope couple and horizontal
(d)

It is the angle between the axis of spin couple and axis of precession
Answer:

Option (a)

43.

Which of the following is correct regarding the angle of heel?

(a)

It is the angle between the axis of spin couple and axis of precession
(b)

It is the angle between the axis of gyroscope couple and horizontal
(c)

It is inclination of the vehicle to the horizontal for equilibrium
(d)

It is inclination of the axis of spin to the horizontal for equilibrium
Answer:

Option (d)

44.

When is the positive sign used for the expression of the gyroscopic couple?

(a)

The Centre of gravity is lower than the center of the vehicle
(b)

When the engine is rotating in the opposite direction as that of wheels
(c)

When the engine is rotating in the same direction as that of wheels
(d)

Centre of gravity is higher than vehicle centre
Answer:

Option (c)

45.

The centrifugal couple’s tendency is to overturn the vehicle.

(a)

True
(b)

False
Answer:

Option (a)

46.

The centrifugal couple affects the stability of a two wheel vehicle taking a turn.

(a)

True
(b)

False
Answer:

Option (a)

47.

Balancing couple is given by _______. (θ: angle of heel)

(a)

m.g.h cosθ
(b)

m.g.h sinθ
(c)

m.g.h
(d)

(m.v2).h/R
Answer:

Option (b)

48.

What is the relation between an overturning couple and a balancing couple for the stability of the vehicle?

(a)

Independent of each other
(b)

The overturning couple is greater
(c)

Balancing couple is greater
(d)

Equal to each other
Answer:

Option (d)

49.

Calculate gyroscopic couple acting on a disc that has a radius of 135 mm. Angular and precessional velocities are 15 rad/sec and 7 rad/sec respectively. Assume density = 7810 kg/m3  and thickness of disc = 30 mm.

(a)

12.83 N-m
(b)

10.99 N-m
(c)

11 N-m
(d)

Incomplete data
Answer:

Option (a)

50.

What is the gyroscopic couple acting on the disc which has a mass moment of inertia equal to 0.02135 kg-m2? If the disc has a speed of 500 rpm and is made to precess at 100 rpm.

(a)

13.21 N-m
(b)

11.70 N-m
(c)

10.23 N-m
(d)

Incomplete data
Answer:

Option (b)

Showing 41 to 40 out of 50 Questions
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