McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 251. |
Secondary stresses may be set up in frame due to any of the following reasons EXCEPT |
| A. | members not being straight |
| B. | self-weight of the members |
| C. | eccentricity of connections |
| D. | rigidity of the members |
| E. | 107 dynes |
| Answer» D. rigidity of the members | |
| 252. |
Moment of Inertia of triangular section about an axis passing through its base is given by |
| A. | bh3/12 |
| B. | bh3/32 |
| C. | bh3/36 |
| D. | None of the above |
| E. | Tapered bearing |
| Answer» A. bh3/12 | |
| 253. |
Which of the following could be the unit of rotational inertia of a body in CGS system? |
| A. | cm4 |
| B. | gm-cm2 |
| C. | 107 dynes |
| D. | kg-cm2 |
| E. | gm-cm4 |
| Answer» B. gm-cm2 | |
| 254. |
The angular acceleration of a flywheel decreases uniformly from 8 rad/sec2 to 2 rad sec2 in 6 sec at which time its angular velocity is 42 rad/sec. The initial angular velocity was |
| A. | 12 rad/sec |
| B. | 24 rad/sec |
| C. | 30 rad/sec |
| D. | 3 rad/sec |
| E. | 6 rad/sec |
| Answer» A. 12 rad/sec | |
| 255. |
During SHM which of the following is conserved? |
| A. | Kinetic energy |
| B. | Potential energy |
| C. | Total energy |
| D. | Momentum |
| E. | All of the above |
| Answer» D. Momentum | |
| 256. |
The standard angle between the sides of a V-belt is |
| A. | 30? |
| B. | 25? |
| C. | 40? |
| D. | 45? |
| E. | 55? |
| Answer» A. 30? | |
| 257. |
The main advantage of using worm gears is |
| A. | Low power loss |
| B. | High velocity ratio |
| C. | Ease of manufacture |
| D. | Minimum cost |
| E. | All of the above |
| Answer» C. Ease of manufacture | |
| 258. |
The angle of friction is |
| A. | The angle which frictional force makes with the normal |
| B. | The anle at which the force applied from external souce will cause movement |
| C. | The angle at which fictional force is inclined to external force |
| D. | The angle between the normal reaction and the resultant of normal reaction and the limiting friction |
| E. | None of the above |
| Answer» D. The angle between the normal reaction and the resultant of normal reaction and the limiting friction | |
| 259. |
In the speed of rotation of earth decreases, the weight of the body will |
| A. | Decrease |
| B. | Remain unaltered |
| C. | Depends on speed ratio |
| D. | Cannot be ascertained on the basis the information given |
| E. | Increase |
| Answer» C. Depends on speed ratio | |
| 260. |
Which of the following is not a lever of the first order? |
| A. | Pair of Smith's tongs |
| B. | Wheel barrow |
| C. | Ordinary balance |
| D. | Pair of scissors |
| E. | 107 dynes |
| Answer» B. Wheel barrow | |
| 261. |
A force of 100 Newtons acts for 0.5 seconds on a body of mass 20 kg which is initially at rest. The velocity attained by the body is |
| A. | 20 m/s |
| B. | 5 m/s |
| C. | 2.5 m/s |
| D. | 0.5 m/s |
| E. | 107 dynes |
| Answer» C. 2.5 m/s | |
| 262. |
The angle of projection when the range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection will be |
| A. | 30? |
| B. | 45? |
| C. | 15? |
| D. | 90? |
| E. | 22 |
| Answer» C. 15? | |
| 263. |
The motion of a bicycle wheel is |
| A. | Curvilinear |
| B. | Translatory |
| C. | Linear |
| D. | Rotary as well as translatory |
| E. | Rotary |
| Answer» D. Rotary as well as translatory | |
| 264. |
A particle in simple Harmonic Motion while passing through mean position will have |
| A. | Maximum kinetic energy and minimum potential energy |
| B. | Average kinetic energy and average potential energy |
| C. | Minimum kinetic energy and maximum potential energy |
| D. | Maximum kinetic energy and maximum |
| E. | Minimum kinetic energy and minimum potential energy |
| Answer» A. Maximum kinetic energy and minimum potential energy | |
| 265. |
A bullet is fired from a fifle. If the rifle recoils freely, the kinetic energy of the rifle |
| A. | will be the same as the kinetic energy of the bullet |
| B. | will be less than the kinetic energy of the bullet |
| C. | 107 dynes |
| E. | will be more than the kinetic energy of the bullet |
| Answer» B. will be less than the kinetic energy of the bullet | |
| 266. |
The locus of a point on a thread unwound from a cylinder will be |
| A. | A circle |
| B. | A cycloid |
| C. | A straight line |
| D. | A spiral |
| E. | An involute |
| Answer» B. A cycloid | |
| 267. |
The moment of inertia of a thin spherical shell is |
| A. | Mr2 |
| B. | 1/2 Mr2 |
| C. | 1/3 Mr2 |
| D. | 2/3 Mr2 |
| E. | None of the above |
| Answer» D. 2/3 Mr2 | |
| 268. |
A train travels between two stations 15 km apart in 18 minutes. If the train accelerates for a part of journey uniformly followed by uniform retardation, the maximum speed attained by the train during the journey will by |
| A. | 125 km/hr |
| B. | 107 dynes |
| C. | 80 km/hr |
| D. | 100 km/hr |
| E. | 60 km/hr |
| Answer» D. 100 km/hr | |
| 269. |
A man is standing ner the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platorm will decrease if he |
| A. | extends his arms outwards |
| B. | 107 dynes |
| C. | moves towards the axis of rotation |
| D. | jumps out from that platform |
| E. | take out his coat and throws away |
| Answer» A. extends his arms outwards | |
| 270. |
A apinning ballet dancer draws her arms close to her chest. She will now |
| A. | 107 dynes |
| B. | spin at the same rate |
| C. | spin faster |
| D. | spin slower |
| E. | stop spinning |
| Answer» D. spin slower | |
| 271. |
The moment of inertia of a solid sphere of radius r is |
| A. | Mr2 |
| B. | 1/8 Mr2 |
| C. | 2/3 Mr2 |
| D. | m4 |
| E. | 1/2 Mr2 |
| Answer» A. Mr2 | |
| 272. |
A stone of wight 100 kg is thrown vertically upwards by a man of height y = 1.8 m with an initial velocity of 20 m/sec. The maximum height to which it will rise would be |
| A. | 22.2 m |
| B. | 26 m |
| C. | 15.1 m |
| D. | 20.2 m |
| E. | 10 m |
| Answer» A. 22.2 m | |
| 273. |
The breaking strength of a rope is 400 N. A fireman weighing 60 kg slides down the rope. The rope will break if |
| A. | 107 dynes |
| B. | the acceleration is 7.5 m/s2 |
| C. | the acceleration is 1.2 m/s2 |
| D. | the acceleration is 3.1 m/s2 |
| E. | the slides with an acceleration of 15 m/s2 |
| Answer» C. the acceleration is 1.2 m/s2 | |
| 274. |
In case of a beam subjected to pure bending |
| A. | 107 dynes |
| B. | the stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis |
| C. | the stress intensity in any fibre is proportional to the distance of the fibre from the load carrying end |
| D. | the stress intensity in any fibre is uniform |
| E. | the nature of stress in any fibre is identical |
| Answer» B. the stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis | |
| 275. |
A non-reversible machine has efficiency |
| A. | less than 50% |
| B. | nearly 100% |
| C. | between 75% and 99% |
| D. | more than 50% |
| E. | 107 dynes |
| Answer» A. less than 50% | |
| 276. |
The ratio of moment of inertia of a circular body about x axis to that about y axis is |
| A. | ? |
| B. | ? |
| D. | 1?4 |
| E. | 1 |
| Answer» E. 1 | |
| 277. |
A compressure force in boom in above problem is |
| A. | 107 dynes |
| B. | 1096 kg |
| C. | 886 kg |
| D. | 693 kg |
| E. | 1390 kg |
| Answer» E. 1390 kg | |
| 278. |
A body having SHM has period of 6 sec and amplitude of 4 mts. Maximum velocity is |
| A. | ?/3 m/s |
| B. | 2?/3 m/s |
| C. | 107 dynes |
| D. | 3? m/s |
| E. | 4?/3 m/s |
| Answer» E. 4?/3 m/s | |
| 279. |
What is the maximum force, in Newtons, that will not cause tension? |
| A. | 294 |
| B. | 316 |
| C. | 346 |
| D. | 184 |
| E. | 107 dynes |
| Answer» A. 294 | |
| 280. |
Centroid of the are of circle shown in adjacement figure is |
| A. | r sin (?/2)/2 ?, 0 |
| B. | r sin (?)/?, 0 |
| C. | 2 r sin (?/2)/?, 0 |
| D. | 107 dynes |
| E. | 2r sin (?)/?, 0 |
| Answer» C. 2 r sin (?/2)/?, 0 | |
| 281. |
The centroid of the area between the circle x2 + y2 = 16 and the line x + y = 4 will have the coordinates |
| A. | (4, 2) |
| B. | (2, 4) |
| C. | (2.34, 2.34) |
| D. | (1.16, 1.16) |
| E. | None of the above |
| Answer» C. (2.34, 2.34) | |
| 282. |
Polar moment of inertia is |
| A. | Applicable to masses whereas moment of inertia is applicable to area only |
| B. | The moment of inertia for an area ralative to a line or axis which is out the plane of area |
| C. | Same as moment of inertia |
| D. | The moment of inertia for an area relative to a line or axis parallel to the centroidal axis |
| E. | The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area |
| Answer» E. The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area | |
| 283. |
A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of |
| A. | 56,900 ft |
| B. | 107 dynes |
| C. | 75,000 ft |
| D. | 48.300 ft |
| E. | 65,800 ft |
| Answer» C. 75,000 ft | |
| 284. |
In the impact problems the following conditions must always be satisfied |
| A. | The total kinetic energy remains unchanged |
| B. | The total linear momentum remains unchanged |
| C. | The magnitude of the total linear momentum is multiplied by the coefficient of restitution |
| D. | The kinetic energy of the system is reduced by a factor proportional to the coefficient of restitution |
| E. | None of the above |
| Answer» B. The total linear momentum remains unchanged | |
| 285. |
A hammer gains 50 Ns momentum in 0.05 sec. The average force on the hammer will be |
| A. | 500 N |
| B. | 2000 N |
| C. | 1500 N |
| D. | 107 dynes |
| E. | 1000 N |
| Answer» E. 1000 N | |
| 286. |
If the distance to electric train is given by Fr = a + bv + cv2 In this equation constant c is likely to cover |
| A. | air resistance |
| B. | track resistance |
| C. | frictional resistance |
| D. | flange resistance |
| E. | 107 dynes |
| Answer» A. air resistance | |
| 287. |
A man is standing near the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platform will decrease if he |
| A. | extends his arms outwards |
| B. | moves towards the axis of rotation |
| C. | jumps out from the platform |
| D. | accepts a heavy bag from one of his friends standing near by and holds it in his hand |
| E. | 107 dynes |
| Answer» D. accepts a heavy bag from one of his friends standing near by and holds it in his hand | |
| 288. |
A stone weighing 20 N is whirling in a vertical circle at the extremity of a string 100 cm long. The tension in the string will be zero |
| A. | at the highest position |
| B. | at the lowest position |
| C. | at the midway position |
| D. | at none of the above |
| E. | 107 dynes |
| Answer» A. at the highest position | |
| 289. |
During planetary motion which of the following remains constant? |
| A. | Augular speed |
| B. | Linear velocity |
| C. | Angular acceleration |
| D. | Total angular momentum |
| E. | All of the above |
| Answer» B. Linear velocity | |
| 290. |
According to principle of transmissiblity of forces, when a force acts upon a body, its effect is |
| A. | maximum when it acts at C.G. of the body |
| B. | minimum when it acts at C.G. of the body |
| C. | different at different points of the body |
| D. | 107 dynes |
| E. | same at every point in its line of action |
| Answer» E. same at every point in its line of action | |
| 291. |
The statement --- if forces acting on a point can be represented in magnitude and direction by the sides of a polygon taken in order then their resultant will be represented in magnitude and direction by the closing side of the polygon taken in opposite order ---- is known as |
| A. | Law of triangle of forces |
| B. | Newton's law of forces |
| C. | Law of polygon of forces |
| D. | D'Alembert's rule |
| E. | Lami's theorem |
| Answer» C. Law of polygon of forces | |
| 292. |
A ball A of mass 0.25 kg moving on a smooth horizontal table with a velocity of 10 m/s strikes an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after the impact will be |
| A. | 2.5 m/s |
| B. | zero |
| C. | 5 m/s |
| D. | 10 m/s |
| E. | 107 dynes |
| Answer» C. 5 m/s | |
| 293. |
The slope on the road generally provided on the curves is known as |
| A. | Angle of repose |
| B. | Angle of friction |
| C. | Angle of banking |
| D. | Angle of reaction |
| E. | None of the above |
| Answer» C. Angle of banking | |
| 294. |
An automobile weighing 2800 lb and travelling at 30 miles/hr, hits a depression in the road which has a radius of curvature of 50 ft. What is the total force to which springs are subjected. |
| A. | 8230 lb |
| B. | 6170 lb |
| C. | 2800 ib |
| D. | 107 dynes |
| E. | 3280 lb |
| Answer» B. 6170 lb | |
| 295. |
A block A is dropped down a smooth inclined plane, while another identical block B is released for free fall from the same height |
| A. | block A will have higher velocity than block B while hitting the ground |
| B. | block B will hit the ground earlier. |
| C. | both will hit the ground simultaneously |
| D. | block A will hit the ground earlier |
| E. | 107 dynes |
| Answer» B. block B will hit the ground earlier. | |
| 296. |
A projectile is shot straight up with vo = 40 m/s. After how many seconds will it return if drag is neglected? |
| A. | 6 |
| B. | 107 dynes |
| C. | 4 |
| D. | 10 |
| E. | 8 |
| Answer» E. 8 | |
| 297. |
The necessary condition for the forces acting on a body to be in equilibrium is that these should be |
| A. | In the same direction |
| B. | Coplaner |
| C. | Similar in nature |
| D. | Should not meet at a point |
| E. | (B) and (D) above |
| Answer» E. (B) and (D) above | |
| 298. |
A rocket is fired vertically from the ground with a resultant vertical acceleration of 10 m/sec the fuel is finished in one minute and it continues to move up. The maximum height reached will be |
| A. | 2 km |
| B. | 20 km |
| C. | 36 km |
| D. | 10 km |
| E. | 80 km |
| Answer» A. 2 km | |
| 299. |
What force is necessary to hold a weight of 100 kg suspended on a rope wrapped 3 times around a post |
| A. | 0.35 |
| B. | 0.8 |
| C. | 1.46 |
| D. | 2.85 |
| E. | 107 dynes |
| Answer» A. 0.35 | |
| 300. |
At a roller support the line of reaction and the roller base must be at an angle of |
| A. | 60? |
| B. | 90? |
| C. | not less than 60? |
| D. | not more than 60? |
| E. | 107 dynes |
| Answer» B. 90? | |
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