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.
| 1. |
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the lengm of connecting rod to radius of crank) |
| A. | m.ω2.r sin θ |
| B. | m.ω2.r cos θ |
| C. | m.ω2.r |
| D. | m.ω2.r |
| Answer» E. | |
| 2. |
In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T1 acts at A and smaller tension T2 at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should |
| A. | be zero |
| B. | act in upward direction |
| C. | act in downward direction |
| D. | none of the above |
| Answer» D. none of the above | |
| 3. |
In a Hartnell governor, the lift of the sleeve is given by (where r1 and r2 = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever) |
| A. | (r1 + r2) |
| B. | (r1 + r2) |
| C. | (r1 - r2) |
| D. | (r1 - r2) |
| Answer» D. (r1 - r2) | |
| 4. |
The acceleration of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead centre, and n = Ratio of length of connecting rod to the radius of crank) |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» E. | |
| 5. |
Two pulleys of radii r1 and r2 and at distance x apart are connected by means of an open belt drive. The length of the belt is |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» C. [C]. | |
| 6. |
The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface) |
| A. | μ W R |
| B. | μ W R |
| C. | μ W R |
| D. | μ W R |
| Answer» C. μ W R | |
| 7. |
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The angular acceleration of the link AB is (where and = Radial and tangential components of the acceleration of B with respect to A) |
| A. | [A]. |
| B. | [B]. |
| C. | vBA x AB |
| D. | [D]. |
| Answer» C. vBA x AB | |
| 8. |
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 anti-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» D. ( ω1 - ω2)2r | |
| 9. |
When a particle moves round the circumference of a circle of radius r with ω rad/s, then its maximum acceleration is ω2r. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 10. |
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring) |
| A. | (S₁ + S₂) / h |
| B. | (S₁ - S₂) / h |
| C. | (S₁ + S₂) / 2h |
| D. | (S₁ - S₂) / 2h |
| Answer» C. (S₁ + S₂) / 2h | |
| 11. |
When one of the links of a kinematic chain is fixed, the chain is known as a |
| A. | structure |
| B. | mechanism |
| C. | inversion |
| D. | machine |
| Answer» C. inversion | |
| 12. |
The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear. |
| A. | less |
| B. | more |
| C. | same |
| D. | None of these |
| Answer» C. same | |
| 13. |
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to |
| A. | reduce vibration |
| B. | reduce slip |
| C. | ensure uniform loading |
| D. | ensure proper alignment |
| Answer» D. ensure proper alignment | |
| 14. |
A mechanism consisting of more than four links is called a compound mechanism. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 15. |
A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 16. |
The lead screw of a lathe with nut forms a |
| A. | rolling pair |
| B. | sliding pair |
| C. | screw pair |
| D. | turning pair |
| Answer» D. turning pair | |
| 17. |
The stress induced in a body will be shear stress, when it is subjected to |
| A. | longitudinal vibrations |
| B. | transverse vibrations |
| C. | torsional vibrations |
| D. | none of these |
| Answer» D. none of these | |
| 18. |
In a single slider crank chain |
| A. | each of the four pairs is a turning pair |
| B. | one is a turning pair and three are sliding pairs |
| C. | two are turning pairs and two are sliding pairs |
| D. | three are turning pairs and one is a sliding pair |
| Answer» E. | |
| 19. |
A shaft carrying two rotors at its ends will have |
| A. | no node |
| B. | one node |
| C. | two nodes |
| D. | three nodes |
| Answer» C. two nodes | |
| 20. |
A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by |
| A. | 2 W CE / CS |
| B. | W CE / 2CS |
| C. | W CE / CS |
| D. | W CS / 2CE |
| Answer» C. W CE / CS | |
| 21. |
In a reciprocating steam engine, which of the following forms a kinematic link? |
| A. | Cylinder and piston |
| B. | Piston rod and connecting rod |
| C. | Crankshaft and flywheel |
| D. | Flywheel and engine frame |
| Answer» D. Flywheel and engine frame | |
| 22. |
When two links are connected by a pin joint, their instantaneous centre lies |
| A. | on their point of contact |
| B. | at the centre of curvature |
| C. | at the centre of circle |
| D. | at the pin joint |
| Answer» E. | |
| 23. |
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as |
| A. | simple pendulum |
| B. | compound pendulum |
| C. | torsional pendulum |
| D. | second's pendulum |
| Answer» C. torsional pendulum | |
| 24. |
A Watt's governor is a spring loaded governor. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 25. |
The distance moved by the valve from one end to the other end is called valve travel. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 26. |
The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration. |
| A. | same |
| B. | different |
| C. | Can't say |
| D. | None of these |
| Answer» B. different | |
| 27. |
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is |
| A. | μ W cosec α (r1 + r2) |
| B. | μ W cosec α (r1 + r2) |
| C. | μ W cosec α |
| D. | μ W cosec α |
| Answer» D. μ W cosec α | |
| 28. |
In a simple train of wheels, if the number of intermediate wheels is odd, the motion of the follower will be same as that of the driver. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 29. |
Scott Russell's mechanism is made up of sliding pair. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 30. |
A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is |
| A. | ωv |
| B. | 2 ωv |
| C. | ω²v |
| D. | 2 ωv2 |
| Answer» C. ω²v | |
| 31. |
The amplitude of vibration is always __________ the radius of the circle. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| D. | None of these |
| Answer» B. less than | |
| 32. |
In a gear having involute teeth, the normal to the involute is a tangent to the |
| A. | pitch circle |
| B. | base circle |
| C. | addendum circle |
| D. | dedendum circle |
| Answer» C. addendum circle | |
| 33. |
The rolling of a complete ship side-ways is known as pitching of a ship. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 34. |
The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity. |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | None of these |
| Answer» C. maximum | |
| 35. |
There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is |
| A. | 1/24 |
| B. | 1/8 |
| C. | 4/15 |
| D. | 12 |
| Answer» B. 1/8 | |
| 36. |
When the axes of the first and last wheels are co-axial, then the train is known as |
| A. | simple train of wheels |
| B. | compound train of wheels |
| C. | reverted gear train |
| D. | epicyclic gear train |
| Answer» D. epicyclic gear train | |
| 37. |
The equivalent length of a simple pendulum depends upon the distance between the point of suspension and the centre of gravity. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 38. |
The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the |
| A. | unbalanced couples are caused only at higher speeds |
| B. | unbalanced forces are not dangerous at higher speeds |
| C. | effects of unbalances are proportional to the square of the speed |
| D. | effects of unbalances are directly proportional to the speed |
| Answer» D. effects of unbalances are directly proportional to the speed | |
| 39. |
Which of the following is an example of a higher pair ? |
| A. | Toothed gearing |
| B. | Belt and rope drive |
| C. | Ball and roller bearing |
| D. | all of these |
| Answer» E. | |
| 40. |
Which of the following is a turning pair? |
| A. | Piston and cylinder of a reciprocating steam engine |
| B. | Shaft with collars at both ends fitted into a circular hole |
| C. | Lead screw of a lathe with nut |
| D. | Ball and a socket joint |
| Answer» C. Lead screw of a lathe with nut | |
| 41. |
When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be |
| A. | to move the ship towards star-board |
| B. | to move the ship towards port side |
| C. | to raise the bow and lower the stern |
| D. | to raise the stern and lower the bow |
| Answer» B. to move the ship towards port side | |
| 42. |
When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a |
| A. | D-slide valve |
| B. | governor |
| C. | Meyer's expansion valve |
| D. | flywheel |
| Answer» C. Meyer's expansion valve | |
| 43. |
The total number of instantaneous centres for a mechanism consisting of n links are |
| A. | n/2 |
| B. | n |
| C. | n - 1 |
| D. | n(n - 1)/2 |
| Answer» E. | |
| 44. |
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have |
| A. | free vibration |
| B. | forced vibration |
| C. | damped vibration |
| D. | under damped vibration |
| Answer» D. under damped vibration | |
| 45. |
In considering friction of a V-thread, the virtual coefficient of friction (μ1) is given by |
| A. | μ1 = μ sin β |
| B. | μ1 = μ cos β |
| C. | μ₁ = μ/sin β |
| D. | μ₁ = μ/cos β |
| Answer» E. | |
| 46. |
In a force-closed pair, the two elements of a pair are not held together mechanically. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 47. |
In order to have a good grip on the pulley, the V-belt should touch the bottom of the groove in the pulley. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 48. |
The swaying couple is due to the |
| A. | primary unbalanced force |
| B. | secondary unbalanced force |
| C. | two cylinders of locomotive |
| D. | partial balancing |
| Answer» B. secondary unbalanced force | |
| 49. |
When a body is subjected to transverse vibrations, the stress induced in a body will be |
| A. | shear stress |
| B. | bending stress |
| C. | tensile stress |
| D. | compressive, stress |
| Answer» C. tensile stress | |
| 50. |
Balancing of rotating and reciprocating parts of an engine is necessary when it runs at |
| A. | slow speed |
| B. | moderate speed |
| C. | highs peed |
| D. | any one of these |
| Answer» D. any one of these | |