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.
| 451. |
In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines, |
| A. | the algebraic sum of the primary forces must be equal to zero |
| B. | the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 452. |
The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft. |
| A. | Right |
| B. | Wrong |
| C. | - |
| D. | - |
| Answer» B. Wrong | |
| 453. |
An automobile steering gear is an example of |
| A. | sliding pair |
| B. | rolling pair |
| C. | lower pair |
| D. | higher pair |
| Answer» D. higher pair | |
| 454. |
In order to balance the reciprocating masses, |
| A. | primary forces and couples must be balanced |
| B. | secondary forces and couples must be balanced |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 455. |
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (?) is equal to |
| A. | 90° and 180° |
| B. | 45° and 225° |
| C. | 180° and 270° |
| D. | 270° and 360° |
| Answer» C. 180° and 270° | |
| 456. |
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the |
| A. | pitch circle |
| B. | base circle |
| C. | pitch curve |
| D. | prime circle |
| Answer» D. prime circle | |
| 457. |
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of |
| A. | 2 mm |
| B. | 2.22 mm |
| C. | 2.50 mm |
| D. | 3.0 mm |
| Answer» C. 2.50 mm | |
| 458. |
For a twin cylinder V -engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a |
| A. | 30° V -engine |
| B. | 60° V -engine |
| C. | 120° V -engine |
| D. | 150° V -engine |
| Answer» B. 60° V -engine | |
| 459. |
When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be |
| A. | minimum |
| B. | zero |
| C. | maximum |
| D. | none of these |
| Answer» C. maximum | |
| 460. |
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a |
| A. | lower pair |
| B. | higher pair |
| C. | self-closed pair |
| D. | force-closed pair |
| Answer» B. higher pair | |
| 461. |
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ? = Angular speed of crank, r = Radius of crank, and ? = Angle of inclination of crank to the line of stroke) |
| A. | m .? 2 . r cos ? |
| B. | c . m .? 2 . r sin ? |
| C. | (1 - c ) m .? 2 . r (cos ? - sin ?) |
| D. | m .? 2 . r (cos ? - sin ?) |
| Answer» D. m .? 2 . r (cos ? - sin ?) | |
| 462. |
When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train. |
| A. | Right |
| B. | Wrong |
| C. | - |
| D. | - |
| Answer» C. - | |
| 463. |
In railway axle boxes, the bearing used is |
| A. | deep groove ball bearing |
| B. | double row self-aligning ball bearing |
| C. | double row spherical roller bearing |
| D. | cylindrical roller bearing |
| Answer» D. cylindrical roller bearing | |
| 464. |
A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m 2 attached in the same plane of rotation as that of m 1 , such that (where r 1 and r 2 are the radii of rotation of m 1 and m 2 respectively) |
| A. | m 1 r 2 = m 2 r 1 |
| B. | m 1 r 1 = m 2 r 2 |
| C. | m 1 m 2 = r 1 r 2 |
| D. | none of these |
| Answer» C. m 1 m 2 = r 1 r 2 | |
| 465. |
The two links OA and OB are connected by a pin joint at O . If the link OA turns with angular velocity ? 1 rad/s in the clockwise direction and the link OB turns with angular velocity ? 2 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. | ? 1 .? 2 . r |
| B. | ( ? 1 - ? 2 ) r |
| C. | ( ? 1 + ? 2 ) r |
| D. | ( ? 1 - ? 2 )2 r |
| Answer» C. ( ? 1 + ? 2 ) r | |
| 466. |
In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ?/? n is |
| A. | equal to one |
| B. | equal to 2 |
| C. | less than 2 |
| D. | greater than 2 |
| Answer» C. less than 2 | |
| 467. |
The pair is known as a higher pair, when the relative motion between the elements of a pair is |
| A. | turning only |
| B. | sliding only |
| C. | rolling only |
| D. | partly turning and partly sliding |
| Answer» E. | |
| 468. |
When the relation between the controlling force ( F c ) and radius of rotation ( r ) for a spring controlled governor is F c = ar + b , then the governor will be |
| A. | stable |
| B. | unstable |
| C. | isochronous |
| D. | none of these |
| Answer» C. isochronous | |
| 469. |
In a coupling rod of a locomotive, each of the four pairs is a __________ pair. |
| A. | sliding |
| B. | turning |
| C. | rolling |
| D. | screw |
| Answer» C. rolling | |
| 470. |
The ratio of the actual damping coefficient to the critical damping coefficient is called damping factor. |
| A. | Yes |
| B. | No |
| C. | - |
| D. | - |
| Answer» B. No | |