McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 301. |
The weight of an object will be maximum when it is placed at |
| A. | North pole |
| B. | South pole |
| C. | Equator |
| D. | Centre of earth |
| E. | Any of the above loctions |
| Answer» D. Centre of earth | |
| 302. |
A grinding wheel rotates at 3000 rpm. When power supply is cut off the wheel stops in 5 sec. The number of revolutions made by the wheel before coming to rest would be |
| A. | 500 |
| B. | 107 dynes |
| C. | 250 |
| D. | 3000 |
| E. | 1000 |
| Answer» C. 250 | |
| 303. |
A solid spherical ball rolls on a table. The momen' of inertia of the ball is given by 3/5 x mass x radius2. The ratio of translational and rotational kinetic energies for ball will be |
| A. | 2 |
| B. | 7?16 |
| C. | 5?3 |
| D. | 7?8 |
| E. | 1 |
| Answer» C. 5?3 | |
| 304. |
A particle inside a hollow sphere of internal radius r with coefficient of friction 1/?3 can rest upto height of |
| A. | 0.18 r |
| B. | 0.435 r |
| C. | 0.25 r |
| D. | 0.134 r |
| E. | 0.125 r |
| Answer» D. 0.134 r | |
| 305. |
A particle starts from rest and moves in a straight line whose equation of motion is given by S = 2t3 - t2 - 1. The acceleration of the particle after one sec will be |
| A. | 6 m/sec2 |
| B. | 4 m/sec2 |
| C. | 12 m/sec2 |
| D. | 10 m/sec2 |
| E. | 8 m/sec2 |
| Answer» D. 10 m/sec2 | |
| 306. |
An electric motor drives a windless which hauls up a crate A of weight W = 500 kg up an inclined plane through a height of 10 m in 2 minutes. The torque acting on the windless is 25 kgm and the drum of the windless makes 30 rpm. The efficiency of the inclined plane would be |
| A. | 41% |
| B. | 61% |
| C. | 26.50% |
| D. | 53.05% |
| E. | 66% |
| Answer» D. 53.05% | |
| 307. |
A screw jack has 4 threads per inch. The mean radius of the thread is 2.338 inches. The mean diameter of the bearing surface under the cap is 3.25 inches. What is the turning moment required to raise the bload of 150 kg |
| A. | 5.61 kg-inch |
| B. | 50.6 kg-inch |
| C. | 107 dynes |
| D. | 30.3 kg-inch |
| E. | 23.6 kg-inch |
| Answer» B. 50.6 kg-inch | |
| 308. |
The length of Seconds Pendulum is |
| A. | 992 mm |
| B. | 999 mm |
| C. | 994 mm |
| D. | 995 mm |
| E. | 1000 mm |
| Answer» C. 994 mm | |
| 309. |
The law of conservation of mechanical energy is valid |
| A. | Irrespective of the nature of force field |
| B. | Only in gravitational field |
| C. | Only if the total work done by the particle in moving around in a closed trajectory is zero |
| D. | Only if the force is tangential to the trajectory |
| E. | None of the above |
| Answer» C. Only if the total work done by the particle in moving around in a closed trajectory is zero | |
| 310. |
In above case the maximum height attained by the ball would be |
| A. | 49 cm |
| B. | 490 cm |
| C. | 980 cm |
| D. | 1960 cm |
| E. | 100 cm |
| Answer» B. 490 cm | |
| 311. |
The units of moment of inertia are |
| A. | kgm4 |
| B. | kg-m2 |
| C. | kg/m2 |
| D. | kg/m |
| E. | m4 |
| Answer» C. kg/m2 | |
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