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.
| 351. |
A point on a connecting link (excluding end points) of a double slider crank mechanism traces a |
| A. | straight line path |
| B. | hyperbolic path |
| C. | parabolic path |
| D. | elliptical path |
| Answer» E. | |
| 352. |
The time taken by a particle for one complete oscillationis known as periodic time. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 353. |
At the nodal point in a shaft, the amplitude for torsional vibration will be |
| A. | minimum |
| B. | maximum |
| C. | zero |
| D. | infinity |
| Answer» D. infinity | |
| 354. |
In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 355. |
The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and δ = Static deflection of the body) |
| A. | 1/2π × √(s/m) |
| B. | 1/2π × √(g/δ) |
| C. | 0.4985/√δ |
| D. | any one of these |
| Answer» E. | |
| 356. |
Which of the following is an inversion of a double slider crank chain? |
| A. | Oldham's coupling |
| B. | Elliptical trammel |
| C. | Scotch yoke mechanism |
| D. | all of these |
| Answer» E. | |
| 357. |
In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is |
| A. | 0° |
| B. | 90° |
| C. | 180° |
| D. | 270° |
| Answer» D. 270° | |
| 358. |
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach |
| A. | 0° |
| B. | 90° |
| C. | 180° |
| D. | 360° |
| Answer» B. 90° | |
| 359. |
The controlling force diagram for a spring controlled governor is a curve passing through the origin. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 360. |
Which one of the following can completely balance several masses revolving in different planes on a shaft? |
| A. | A single mass in different planes |
| B. | Two masses in any two planes |
| C. | A single mass in one of the planes of the revolving masses |
| D. | Two equal masses in any two planes |
| Answer» C. A single mass in one of the planes of the revolving masses | |
| 361. |
The effect of swaying couple in a locomotive is resisted by the side pressure between the flanges of the tyres of the wheel and the inside of the rails. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 362. |
The maximum displacement of a body, from its mean position is called amplitude. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 363. |
In a kinematic chain, a quaternary joint is equivalent to |
| A. | one binary joint |
| B. | two binary joints |
| C. | three binary joints |
| D. | four binary joints |
| Answer» D. four binary joints | |
| 364. |
The ratio of maximum fluctuation of energy to the workdone per cycle is called |
| A. | fluctuation of energy |
| B. | maximum fluctuation of energy |
| C. | coefficient of fluctuation of energy |
| D. | none of these |
| Answer» D. none of these | |
| 365. |
The equation of motion for a single degree of freedom system with viscous damping is . The damping ratio of the system is |
| A. | 9/8 |
| B. | 9/82 |
| C. | 9/16 |
| D. | 9/128 |
| Answer» D. 9/128 | |
| 366. |
The ball and socket joint is an example of screw pair. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 367. |
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to |
| A. | 0° and 90° |
| B. | 90° and 180° |
| C. | 135° and 315° |
| D. | 270° and 360° |
| Answer» C. 135° and 315° | |
| 368. |
When the nature of contact between the elements of a pair is such that it can turn or revolve about a fixed axis, the pair is known as a rolling pair. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 369. |
The brake commonly used in railway trains is |
| A. | shoe brake |
| B. | band brake |
| C. | band and block brake |
| D. | internal expanding brake |
| Answer» B. band brake | |
| 370. |
The motion of a shaft in a circular hole is an example of |
| A. | completely constrained motion |
| B. | incompletely constrained motion |
| C. | successfully constrained motion |
| D. | none of these |
| Answer» C. successfully constrained motion | |
| 371. |
A spring controlled governor is said to be unstable when the controlling force |
| A. | increases as the radius of rotation decreases |
| B. | increases as the radius of rotation increases |
| C. | decreases as the radius of rotation increases |
| D. | remains constant for all radii of rotation |
| Answer» D. remains constant for all radii of rotation | |
| 372. |
The brake commonly used in motor cars is internal expanding brake. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 373. |
A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m2 attached in the same plane of rotation as that of m1, such that (where r1 and r2 are the radii of rotation of m1 and m2 respectively) |
| A. | m1r2 = m2r1 |
| B. | m1r1 = m2r2 |
| C. | m1m2 = r1r2 |
| D. | none of these |
| Answer» C. m1m2 = r1r2 | |
| 374. |
The dynamic friction is the friction experienced by a body, when the body |
| A. | is in motion |
| B. | is at rest |
| C. | just begins to slide over the surface of the other body |
| D. | none of the above |
| Answer» B. is at rest | |
| 375. |
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O) |
| A. | ω1.ω2.r |
| B. | ( ω1 - ω2)r |
| C. | ( ω1 + ω2)r |
| D. | ( ω1 - ω2)2r |
| Answer» C. ( ω1 + ω2)r | |
| 376. |
Which of the following is an inversion of a single slider crank chain? |
| A. | Pendulum pump |
| B. | Oscillating cylinder engine |
| C. | Rotary internal combustion engine |
| D. | all of these |
| Answer» E. | |
| 377. |
If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» C. 1.5 | |
| 378. |
The rotating shafts tend to vibrate violently at whirling speeds because |
| A. | the system is unbalanced |
| B. | bearing centre line coincides with the axis |
| C. | the shafts are rotating at very high speeds |
| D. | resonance is caused due to the heavy mass of the rotor |
| Answer» E. | |
| 379. |
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the |
| A. | tip of the gear tooth and flank of pinion |
| B. | tip of the pinion and flank of gear |
| C. | flanks of both gear and pinion |
| D. | tip of both gear and pinion |
| Answer» B. tip of the pinion and flank of gear | |
| 380. |
The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the right. The effect of gyroscopic couple on the aeroplane will be to dip the nose and raise the tail. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 381. |
The two elements of a pair are said to form a higher pair, when they |
| A. | have a surface contact when in motion |
| B. | have a line or point contact when in motion |
| C. | are kept in contact by the action of external forces, when in motion |
| D. | permit relative motion |
| Answer» C. are kept in contact by the action of external forces, when in motion | |
| 382. |
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be |
| A. | to raise the bow and stern |
| B. | to lower the bow and stern |
| C. | to raise the bow and lower the stern |
| D. | to raise the stern and lower the bow |
| Answer» D. to raise the stern and lower the bow | |
| 383. |
The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is |
| A. | equal to 1 |
| B. | less than 2 |
| C. | equal to 2 |
| D. | greater than 2 |
| Answer» E. | |
| 384. |
When two pulleys are connected by means of an open belt drive, then both the pulleys will rotate is opposite directions. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 385. |
In a mechanism, the fixed instantaneous centres are those centres which |
| A. | remain in the same place for all configurations of the mechanism |
| B. | vary with the configuration of the mechanism |
| C. | moves as the mechanism moves, but joints are of permanent nature |
| D. | none of the above |
| Answer» B. vary with the configuration of the mechanism | |
| 386. |
The velocity of the rubbing surface __________ with the distance from the axis of the bearing. |
| A. | increases |
| B. | decreases |
| C. | Can't say |
| D. | None of these |
| Answer» B. decreases | |
| 387. |
The D-slide valve is also known as |
| A. | inside admission valve |
| B. | outside admission valve |
| C. | piston slide valve |
| D. | none of these |
| Answer» C. piston slide valve | |
| 388. |
A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become |
| A. | tp/16 |
| B. | tp/4 |
| C. | 4 tp |
| D. | 16 tp |
| Answer» C. 4 tp | |
| 389. |
For an involute gear, the ratio of base circle radius and pitch circle radius is equal to |
| A. | sin φ |
| B. | cos φ |
| C. | sec φ |
| D. | cosec φ |
| Answer» C. sec φ | |
| 390. |
Which of the following statement is correct for involute gears? |
| A. | The interference is inherently absent. |
| B. | The variation in centre distance of shafts increases radial force. |
| C. | A convex flank is always in contact with concave flank. |
| D. | The pressure angle is constant throughout the teeth engagement. |
| Answer» E. | |
| 391. |
In a simple harmonic motion, the velocity vector with respect to displacement vector |
| A. | is in phase |
| B. | leads by 90° |
| C. | leads by 180° |
| D. | lags by 90° |
| Answer» E. | |
| 392. |
Which of the following statement is correct as regard to the difference between a machine and a structure? |
| A. | The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another |
| B. | The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only |
| C. | A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work |
| D. | all of the above |
| Answer» E. | |
| 393. |
A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis |
| A. | at the origin |
| B. | below the origin |
| C. | above the origin |
| D. | any one of these |
| Answer» C. above the origin | |
| 394. |
The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical) |
| A. | sinα = b/c |
| B. | cosα = c/b |
| C. | tan α = c/2b |
| D. | cotα = c/2b |
| Answer» D. cotα = c/2b | |
| 395. |
The mechanism consisting of three turning pairs and one sliding pair, is called a |
| A. | single slider crank chain |
| B. | Whitworth quick return motion mechanism |
| C. | crank and slotted lever quick return motion mechanism |
| D. | all of the above |
| Answer» E. | |
| 396. |
The factional torque for square thread at the mean radius r while raising load W is given by |
| A. | T = W.r tan(φ - α) |
| B. | T = W.r tan(φ + α) |
| C. | T = W.r tan α |
| D. | T = W.r tan φ |
| Answer» C. T = W.r tan α | |
| 397. |
Creep in belt drive is due to |
| A. | weak material of the belt |
| B. | weak material of the pulley |
| C. | uneven extensions and contractions of the belt when it passes from tight side to slack side |
| D. | expansion of the belt |
| Answer» D. expansion of the belt | |
| 398. |
A shaft carrying three rotors will have |
| A. | no node |
| B. | one node |
| C. | two nodes |
| D. | three nodes |
| Answer» D. three nodes | |
| 399. |
For an isochronous Hartnell governor (where r1 and r2 = Maximum and minimum radius of rotation of balls respectively, S1 and S2 = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve) |
| A. | (m.g + S₁)/(m.g + S₂) = r₁/r₂ |
| B. | (m.g - S₁)/(m.g - S₂) = r₂/r₁ |
| C. | S₁/S₂ = r₁/r₂ |
| D. | S₂/S₁ = r₁/r₂ |
| Answer» B. (m.g - S₁)/(m.g - S₂) = r₂/r₁ | |
| 400. |
A link or element need not to be a rigid body, but it must be a resistant body. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |