Questions and answers for exam Preparation

MCQs

Total Questions : 543 | Page 48 of 55 pages

Question 471. In a hydrodynamic journal bearing, there is

A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
A thick film of lubricant between the journal and the bearing
No lubricant between the journal and the bearing
A forced lubricant between the journal and the bearing

Discuss Question

Answer: Option B. -> A thick film of lubricant between the journal and the bearing

Question 472. The height of a Watt's governor is

Directly proportional to speed
Directly proportional to (speed)2
Inversely proportional to speed
Inversely proportional to (speed)2

Discuss Question

Answer: Option D. -> Inversely proportional to (speed)2

Question 473. In multi V-belt transmission, if one of the belt is broken, we have to change the

Broken belt
Broken belt and its adjacent belts
All the belts
There is no need of changing any one as remaining belts can take care of transmission of load

Discuss Question

Answer: Option C. -> All the belts

Question 474. The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
The Ackerman steering gear consists of turning pairs
The Ackerman steering gear is most economical
Both (A) and (B)

Discuss Question

Answer: Option D. -> Both (A) and (B)

Question 475. Maximum fluctuation of energy in a flywheel is equal to [where $$I$$ = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, CS = Coefficient of fluctuation of speed and $$\omega $$ = Mean angular speed = $$\frac{{{\omega _1} + {\omega _2}}}{2}$$ ]

$$I\omega \left( {{\omega _1} - {\omega _2}} \right)$$
$$I{\omega ^2}{{\text{C}}_{\text{S}}}$$
$${\text{2E}}{{\text{C}}_{\text{S}}}$$
All of these

Discuss Question

Answer: Option D. -> All of these

Question 476. The gear train usually employed in clocks is a

Simple gear train
Reverted gear train
Sun and planet gear
Differential gear

Discuss Question

Answer: Option B. -> Reverted gear train

Question 477. The method of direct and reverse cranks is used in engines for

The control of speed fluctuations
Balancing of forces and couples
Kinematic analysis
Vibration analysis

Discuss Question

Answer: Option B. -> Balancing of forces and couples

Question 478. Rectilinear motion of piston is converted into rotary by

Cross head
Slider crank
Connecting rod
Gudgeon pin

Discuss Question

Answer: Option B. -> Slider crank

Question 479. Pulley in a belt drive acts as

Cylindrical pair
Turning pair
Rolling pair
Sliding pair

Discuss Question

Answer: Option C. -> Rolling pair

Question 480. Which of the following statement is correct?

The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation.
The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.
The velocity of a particle moving with simple harmonic motion is zero at the mean position.
The acceleration of the particle moving with simple harmonic motion is maximum at the mean position.

Discuss Question

Answer: Option A. -> The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation.