Questions and answers for exam Preparation

MCQs

Total Questions : 543 | Page 47 of 55 pages

Question 461. A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is $$\alpha $$. The effort applied parallel to the plane is given by (where $$\mu $$ = $$\tan \varphi $$ = Coefficient of friction between the plane and the body)

$${\text{P}} = {\text{W}}\tan \alpha $$
$${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$
$${\text{P}} = {\text{W}}\left( {\sin \alpha + \mu \cos \alpha } \right)$$
$${\text{P}} = {\text{W}}\left( {\cos \alpha + \mu \sin \alpha } \right)$$

Discuss Question

Answer: Option C. -> $${\text{P}} = {\text{W}}\left( {\sin \alpha + \mu \cos \alpha } \right)$$

Question 462. Cross head and guides form a

Lower pair
Higher pair
Turning pair
Sliding pair

Discuss Question

Answer: Option D. -> Sliding pair

Question 463. A slider crank chain consists of following numbers of turning and sliding pairs

1, 3
2, 2
3, 1
4, 0

Discuss Question

Answer: Option C. -> 3, 1

Question 464. The periodic time is given by (where $$\omega $$ = Angular velocity of the particle in rad/s)

$$\frac{\omega }{{2\pi }}$$
$$\frac{{2\pi }}{\omega }$$
$$\omega \times 2\pi $$
$$\frac{\pi }{\omega }$$

Discuss Question

Answer: Option B. -> $$\frac{{2\pi }}{\omega }$$

Question 465. Hart mechanism has

Eight links
Six links
Four links
Twelve links

Discuss Question

Answer: Option B. -> Six links

Question 466. Which of the following statement is wrong?

A round bar in a round hole form a turning pair
A square bar in a square hole form a sliding pair
A vertical shaft in a foot step bearing forms a successful constraint
All of the above

Discuss Question

Answer: Option C. -> A vertical shaft in a foot step bearing forms a successful constraint

Question 467. Which of the following statement is wrong?

The difference between the maximum and minimum energies is called maximum fluctuation of energy
The coefficient of fluctuation of speed is the ratio of maximum fluctuation of speed to the mean speed
The variations of energy above and below the mean resisting torque line is known as fluctuation of energy
None of the above

Discuss Question

Answer: Option D. -> None of the above

Question 468. In the two rotor system as shown in the below figure $$\left( {{l_1} < {l_2}} \right),$$ a node of vibration is situated