Questions and answers for exam Preparation

MCQs

Total Questions : 543 | Page 6 of 55 pages

Question 51. Bifilar suspension method is used to find the

Angular acceleration of the body
Moment of inertia of the body
Periodic time of the body
Frequency of vibration of the body

Discuss Question

Answer: Option B. -> Moment of inertia of the body

Question 52. Scotch yoke mechanism is used to generate

Sine functions
Square roots
Logarithms
Inversions

Discuss Question

Answer: Option A. -> Sine functions

Question 53. V-belts are usually used for

Long drives
Short drives
Long and short drives
None of these

Discuss Question

Answer: Option B. -> Short drives

Question 54. A body is said to be under forced vibrations, when

There is a reduction in amplitude after every cycle of vibration
No external force acts on a body, after giving it an initial displacement
A body vibrates under the influence of external force
None of the above

Discuss Question

Answer: Option A. -> There is a reduction in amplitude after every cycle of vibration

Question 55. ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is

$$\frac{1}{3}$$ v
$$\frac{2}{3}$$ v
$$\frac{3}{2}$$ v
$$\frac{9}{4}$$ v

Discuss Question

Answer: Option C. -> $$\frac{3}{2}$$ v

Question 56. In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

45 mm
Slightly less than 45 mm
Slightly more than 45 mm
95 mm

Discuss Question

Answer: Option C. -> Slightly more than 45 mm

Question 57. The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft and $$I$$ = Mass moment of inertia of the disc attached at the end of a shaft)

$$2\pi \sqrt {\frac{{\text{q}}}{I}} $$
$$2\pi \sqrt {{\text{q}}I} $$
$$\frac{1}{{2\pi }}\sqrt {\frac{{\text{q}}}{I}} $$
$$\frac{1}{{2\pi }}$$

Discuss Question

Answer: Option C. -> $$\frac{1}{{2\pi }}\sqrt {\frac{{\text{q}}}{I}} $$

Question 58. When the primary direct crank of a reciprocating engine makes an angle of $$\theta $$ with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.

$$\frac{\theta }{2}$$
$$\theta $$
$$2\theta $$
$$4\theta $$

Discuss Question

Answer: Option C. -> $$2\theta $$

Question 59. The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank and $$\theta $$ = Angle of inclination of crank to the line of stroke)

$${\text{m}}{\omega ^2}{\text{r}}\cos \theta $$
$${\text{cm}}{\omega ^2}{\text{r}}\sin \theta $$
$$\left( {1 - {\text{c}}} \right){\text{m}}{\omega ^2}{\text{r}}\left( {\cos \theta - \sin \theta } \right)$$
$${\text{m}}{\omega ^2}{\text{r}}\left( {\cos \theta - \sin \theta } \right)$$

Discuss Question

Answer: Option C. -> $$\left( {1 - {\text{c}}} \right){\text{m}}{\omega ^2}{\text{r}}\left( {\cos \theta - \sin \theta } \right)$$

Question 60. The lower pair is a