Questions and answers for exam Preparation

MCQs

Total Questions : 543 | Page 7 of 55 pages

Question 61. Frequency of vibrations is usually expressed in

Number of cycles per hour
Number of cycles per minute
Number of cycles per second
None of these

Discuss Question

Answer: Option C. -> Number of cycles per second

Question 62. If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

Four times the first one
Same as the first one
One fourth of the first one
One and a half times the first one

Discuss Question

Answer: Option C. -> One fourth of the first one

Question 63. The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.

More than
Less than
Same as
None of these

Discuss Question

Answer: Option B. -> Less than

Question 64. In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called

Lead
Steam lap
Exhaust lap
None of these

Discuss Question

Answer: Option B. -> Steam lap

Question 65. A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

The sum of the two masses is equal to the total mass of body
The center of gravity of the two masses coincides with that of the body
The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body
All of the above

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Answer: Option D. -> All of the above

Question 66. The Scott-Russell mechanism consists of

Sliding and turning pairs
Sliding and rotary pairs
Turning and rotary pairs
Sliding pairs only

Discuss Question

Answer: Option A. -> Sliding and turning pairs

Question 67. The indicator using Watt mechanism is known as

Thompson indicator
Richard indicator
Simplex indicator
Thomson indicator

Discuss Question

Answer: Option B. -> Richard indicator

Question 68. In a Hartnell governor, the lift of the sleeve is given by (where r1 and r2 = Max. and Min. radii of rotation, x = Length of ball arm of the lever and y = Length of sleeve arm of the lever)

$$\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\frac{{\text{y}}}{{\text{x}}}$$
$$\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\frac{{\text{x}}}{{\text{y}}}$$
$$\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)\frac{{\text{y}}}{{\text{x}}}$$
$$\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)\frac{{\text{x}}}{{\text{y}}}$$

Discuss Question

Answer: Option C. -> $$\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)\frac{{\text{y}}}{{\text{x}}}$$

Question 69. Which is the false statement about the properties of instantaneous center?

At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
The two rigid links have no linear velocities relative to each other at the instantaneous center
The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
The double center can be denoted either by O2 or O12, but proper selection should be made

Discuss Question

Answer: Option D. -> The double center can be denoted either by O2 or O12, but proper selection should be made

Question 70. The number of links in pantograph mechanism is equal to

Discuss Question

Answer: Option C. -> 4