MCQOPTIONS
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MCQOPTIONS
This section includes 470 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
A body is said to be under forced vibrations, when |
| A. | there is a reduction in amplitude after every cycle of vibration |
| B. | no external force acts on a body, after giving it an initial displacement |
| C. | a body vibrates under the influence of external force |
| D. | none of the above |
| Answer» B. no external force acts on a body, after giving it an initial displacement | |
| 302. |
In a steam engine, the link constitutes a |
| A. | piston, piston rod and crosshead |
| B. | connecting rod with big and small end brasses, caps and bolts |
| C. | crank pin, crankshaft and flywheel |
| D. | all of the above |
| Answer» E. | |
| 303. |
The unbalanced force due to reciprocating masses |
| A. | varies in magnitude but constant in direction |
| B. | varies in direction but constant in magnitude |
| C. | varies in magnitude and direction both |
| D. | constant in magnitude and direction both |
| Answer» B. varies in direction but constant in magnitude | |
| 304. |
A rotary internal combustion engine has __________ cylinders. |
| A. | four |
| B. | five |
| C. | six |
| D. | seven |
| Answer» E. | |
| 305. |
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in |
| A. | transverse vibrations |
| B. | torsional vibrations |
| C. | longitudinal vibrations |
| D. | all of these |
| Answer» B. torsional vibrations | |
| 306. |
When a point moves along a straight line, its acceleration will have |
| A. | radial component only |
| B. | tangential component only |
| C. | coriolis component only |
| D. | radial and tangential components both |
| Answer» C. coriolis component only | |
| 307. |
The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is |
| A. | Fc = ar + b |
| B. | Fc = ar - b |
| C. | Fc = ar |
| D. | Fc = a/r + b |
| Answer» C. Fc = ar | |
| 308. |
The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load) |
| A. | 0.4985/ √δS |
| B. | 0.5615/ √δS |
| C. | 0.571/ √δS |
| D. | 0.6253/ √δS |
| Answer» C. 0.571/ √δS | |
| 309. |
When the sleeve of a Porter governor moves upwards, the governor speed |
| A. | increases |
| B. | decreases |
| C. | remains unaffected |
| D. | first increases and then decreases |
| Answer» B. decreases | |
| 310. |
A reed type tachometer use the principle of |
| A. | longitudinal vibration |
| B. | torsional vibration |
| C. | transverse vibration |
| D. | damped free vibration |
| Answer» D. damped free vibration | |
| 311. |
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose) |
| A. | ω² x OQ |
| B. | ω² x OQ sin θ |
| C. | ω² x OQ cos θ |
| D. | ω² x OQ tan θ |
| Answer» B. ω² x OQ sin θ | |
| 312. |
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard ? |
| A. | All points of the disc have the same velocity |
| B. | The centre of the disc has zero acceleration |
| C. | The centre of the disc has centrifugal acceleration |
| D. | The point on the disc making contact with the plane surface has zero acceleration |
| Answer» C. The centre of the disc has centrifugal acceleration | |
| 313. |
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral C Q NO, if N coincides with O, then |
| A. | acceleration and velocity of the piston P is zero |
| B. | acceleration and velocity of the piston P is maximum |
| C. | acceleration of the piston P is zero and its velocity is maximum |
| D. | acceleration of the piston P is maximum and its velocity is zero |
| Answer» D. acceleration of the piston P is maximum and its velocity is zero | |
| 314. |
The power from the engine to the rear axle of an automobile is transmitted by means of |
| A. | worm and worm wheel |
| B. | spur gears |
| C. | bevel gears |
| D. | Hooke's joint |
| Answer» E. | |
| 315. |
A chain consisting of four links and four joints is called a kinematic chain. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 316. |
When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be |
| A. | stable |
| B. | unstable |
| C. | isochronous |
| D. | hunt |
| Answer» E. | |
| 317. |
A body in motion will be subjected to coriolis acceleration when that body is |
| A. | in plane rotation with variable velocity |
| B. | in plane translation with variable velocity |
| C. | in plane motion which is a resultant of plane translation and rotation |
| D. | restrained to rotate while sliding over another body |
| Answer» E. | |
| 318. |
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done |
| A. | because of difficulty in manufacturing cam profile |
| B. | because of loose contact of follower with cam surface |
| C. | in order to have acceleration in beginning and retardation at the end of stroke within the finite limits |
| D. | because the uniform velocity motion is a partial parabolic motion |
| Answer» D. because the uniform velocity motion is a partial parabolic motion | |
| 319. |
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A) |
| A. | vBA x AB |
| B. | vBA /AB |
| C. | v²BA |
| D. | v²BA /AB |
| Answer» E. | |
| 320. |
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become |
| A. | fn/2 |
| B. | 2 fn |
| C. | 4 fn |
| D. | 8 fn |
| Answer» B. 2 fn | |
| 321. |
The working depth of a gear is the radial distance from the |
| A. | pitch circle to the bottom of a tooth |
| B. | pitch circle to the top of a tooth |
| C. | top of a tooth to the bottom of a tooth |
| D. | addendum circle to the clearance circle |
| Answer» E. | |
| 322. |
When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of the piston will be |
| A. | ω²r. (n + 1)/n |
| B. | ω²r. (n - 1)/n |
| C. | ω²r. n/(n + 1) |
| D. | ω²r. n/(n - 1) |
| Answer» B. ω²r. (n - 1)/n | |
| 323. |
The instantaneous centres which vary with the configuration of mechanism, are called |
| A. | permanent instantaneous centres |
| B. | fixed instantaneous centres |
| C. | neither fixed nor permanent instantaneous centres |
| D. | none of the above |
| Answer» D. none of the above | |
| 324. |
The unbalanced force due to revolving masses |
| A. | varies in magnitude but constant in direction |
| B. | varies in direction but constant in magnitude |
| C. | varies in magnitude and direction both |
| D. | constant in magnitude and direction both |
| Answer» C. varies in magnitude and direction both | |
| 325. |
The height of a Watt's governor is |
| A. | directly proportional to speed |
| B. | directly proportional to (speed)² |
| C. | inversely proportional to speed |
| D. | inversely proportional to (speed)² |
| Answer» E. | |
| 326. |
A body will begin to move down an inclined plane, if the angle of inclination of the plane is __________ the angle of friction. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| D. | None of these |
| Answer» D. None of these | |
| 327. |
In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is |
| A. | 12 |
| B. | 16 |
| C. | 25 |
| D. | 32 |
| Answer» E. | |
| 328. |
A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is |
| A. | 5367 r.p.m. |
| B. | 6000 r.p.m. |
| C. | 9360 r.p.m. |
| D. | 12000 r.p.m. |
| Answer» B. 6000 r.p.m. | |
| 329. |
The throw of the eccentric is equal to the valve travel. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 330. |
In a simple train of wheels, the velocity ratio __________ the intermediate wheels. |
| A. | depends upon |
| B. | is independent of |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 331. |
Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment? |
| A. | D-slide valve |
| B. | Governor |
| C. | Flywheel |
| D. | Meyer's expansion valve |
| Answer» D. Meyer's expansion valve | |
| 332. |
A governor is said to be stable, if the |
| A. | radius of rotation of balls increases as the equilibrium speed decreases |
| B. | radius of rotation of balls decreases as the equilibrium speed decreases |
| C. | radius of rotation of balls increases as the equilibrium speed increases |
| D. | radius of rotation of balls decreases as the equilibrium speed increases |
| Answer» D. radius of rotation of balls decreases as the equilibrium speed increases | |
| 333. |
In a multiple V-belt drive, all the belts should stretch at the same rate. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 334. |
A mechanism consisting of four links is called a __________ mechanism. |
| A. | simple |
| B. | compound |
| C. | Can't say |
| D. | None of these |
| Answer» B. compound | |
| 335. |
The cam follower generally used in air-craft engines is |
| A. | knife edge follower |
| B. | flat faced follower |
| C. | spherical faced follower |
| D. | roller follower |
| Answer» E. | |
| 336. |
In forced vibrations, the magnitude of damping force at resonance is equal to the impressed force. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 337. |
The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base) |
| A. | sin φ + sin α = b/c |
| B. | cos φ - sin α = c/b |
| C. | cot φ - cot α = c/b |
| D. | tan φ + cot α = b/c |
| Answer» D. tan φ + cot α = b/c | |
| 338. |
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship. |
| A. | vertically and parallel |
| B. | vertically and perpendicular |
| C. | horizontally and parallel |
| D. | horizontally and perpendicular |
| Answer» E. | |
| 339. |
The secondary unbalanced force is __________ the primary unbalanced force. |
| A. | one-half |
| B. | two-third |
| C. | n times |
| D. | 1/n times |
| Answer» E. | |
| 340. |
The coriolis component of acceleration is taken into account for |
| A. | slider crank mechanism |
| B. | four bar chain mechanism |
| C. | quick return motion mechanism |
| D. | all of these |
| Answer» D. all of these | |
| 341. |
In a pantograph, all the pairs are |
| A. | turning pairs |
| B. | sliding pairs |
| C. | spherical pairs |
| D. | self-closed pairs |
| Answer» B. sliding pairs | |
| 342. |
A mechanism __________ for transmitting or transforming motion. |
| A. | can be used |
| B. | can not be used |
| C. | Can't say |
| D. | None of these |
| Answer» B. can not be used | |
| 343. |
The acceleration of the particle moving with simple harmonic motion is __________ at the mean position. |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | None of these |
| Answer» B. minimum | |
| 344. |
The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are complex conjugate, then the system will be critically damped. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 345. |
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the __________ pulley must be taken into consideration. |
| A. | smaller |
| B. | larger |
| C. | Can't say |
| D. | None of these |
| Answer» B. larger | |
| 346. |
A slider moving on a fixed link having constant radius of curvature will have its instantaneous centre at the centre of the circle. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 347. |
A single degree of freedom system is given by , with usual notations. It represents |
| A. | free vibration with damping |
| B. | free vibration without damping |
| C. | forced vibration with damping |
| D. | forced vibration without damping |
| Answer» D. forced vibration without damping | |
| 348. |
The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where δ = Static deflection of a simply supported shaft due to the point load) |
| A. | 0.4985/ √δ |
| B. | 0.5615/ √δ |
| C. | 0.571/ √δ |
| D. | 0.6253/ √δ |
| Answer» C. 0.571/ √δ | |
| 349. |
The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is |
| A. | 0° and 90° |
| B. | 180° and 360° |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 350. |
In order to double the period of a simple pendulum, the length of the string should be |
| A. | halved |
| B. | doubled |
| C. | quadrupled |
| D. | none of these |
| Answer» D. none of these | |