McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 1. |
Which of the following is incorrect regarding inertia force? |
| A. | imaginary force |
| B. | acts upon a rigid body |
| C. | brings the body to equilibrium |
| D. | same direction as of accelerating force |
| Answer» D. same direction as of accelerating force | |
| 2. |
Inertia torque acts in the same direction as the accelerating couple? |
| A. | true |
| B. | false |
| Answer» B. false | |
| 3. |
If a force has a line of action at a distance h from the centre of gravity, then the value of h is given by |
| A. | i. α/f |
| B. | i. α/m.g |
| C. | i/m.k |
| D. | m.k/i |
| Answer» A. i. α/f | |
| 4. |
D-Alembert’s principle is used for which of the following? |
| A. | change static problem into a dynamic problem |
| B. | change dynamic problem to static problem |
| C. | to calculate moment of inertia of rigid bodies |
| D. | to calculate angular momentum of a system of masses |
| Answer» B. change dynamic problem to static problem | |
| 5. |
2 D ALEMBERT'S PRINCIPLE - DYNAMIC ANALYSIS IN RECIPROCATING ENGINES |
| A. | reversed effective force |
| B. | net force |
| C. | coriolis force |
| D. | resultant force |
| Answer» A. reversed effective force | |
| 6. |
A body remains in equilibrium if |
| A. | inertia force is applied in the same direction to the resultant force |
| B. | inertia force is applied in the direction opposite to the resultant force |
| C. | inertia force is applied in the direction perpendicular to the resultant force |
| D. | inertia force is applied in the direction parallel to the resultant force |
| Answer» B. inertia force is applied in the direction opposite to the resultant force | |
| 7. |
Inertia force and the reversed effective force are the same. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 8. |
In the following picture the G is the center of gravity, the quantity h is known as the “offset”. I is the moment of inertia and k is the radius of gyration. Offset’s value is given by? |
| A. | i.α/f |
| B. | i.α/m.g |
| C. | i/m.k |
| D. | m.k/i |
| Answer» A. i.α/f | |
| 9. |
Considering a four bar chain with each link having linear and angular acceleration, applying D-Alembert’s principle will never result in which of the following member? |
| A. | 2- force member |
| B. | 3- force member |
| C. | 4 – force member |
| D. | non accelerating member |
| Answer» A. 2- force member | |
| 10. |
Piston effort acts along the line of stroke. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 11. |
In a horizontal engine, reciprocating parts are accelerated when the piston moves from |
| A. | tdc to bdc |
| B. | bdc to tdc |
| C. | midway to tdc |
| D. | bdc to midway |
| Answer» A. tdc to bdc | |
| 12. |
In a horizontal engine, reciprocating parts are retarded when the piston moves from |
| A. | tdc to bdc |
| B. | bdc to tdc |
| C. | midway to tdc |
| D. | bdc to midway |
| Answer» B. bdc to tdc | |
| 13. |
When the piston is accelerated, the piston effort is given by which of the following the equation? |
| A. | f(l) – f(i) |
| B. | f(l) + f(i) |
| C. | f(l) ± f(i) |
| D. | f(l) – f(i) + r(f) |
| Answer» B. f(l) + f(i) | |
| 14. |
In the presence of frictional resistance, the expression for piston effort is |
| A. | f(l) – f(i) |
| B. | f(l) + f(i) |
| C. | f(l) ± f(i) – r(f) |
| D. | f(l) – f(i) + r(f) |
| Answer» C. f(l) ± f(i) – r(f) | |
| 15. |
Crank effort is the product of crank pin radius and |
| A. | thrust on sides |
| B. | crankpin effort |
| C. | force acting along connecting rod |
| D. | piston effort |
| Answer» B. crankpin effort | |
| 16. |
In a horizontal engine, the weight of the reciprocating parts also add/subtract to the piston effort. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 17. |
For the given data of an Internal combustion engine : Mass of parts = 180 kg bore = 175 mm, length of stroke = 200 mm, engine speed = 500 r.p.m., length of connecting rod = 400 mm and crank angle = 60° from T.D.C, find the inertia force. |
| A. | 17.56 n |
| B. | 19.2 n |
| C. | 18.53 n |
| D. | 18.00 n |
| Answer» C. 18.53 n | |
| 18. |
45 N/mm2. The connecting rod length between centres is 1.2 m and the cylinder bore is 0.5 m. If the engine runs at 250 r.p.m. and if the effect of piston rod diameter is neglected, calculate the net load on piston. |
| A. | 88000 n |
| B. | 90560 n |
| C. | 78036 n |
| D. | 88357 n |
| Answer» D. 88357 n | |
| 19. |
Multi cylinder engines are usually placed at an equal inclination to each other. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 20. |
For a multicylinder engine, the coefficient of fluctuation of speed would vary with |
| A. | number of cylinders |
| B. | remains unaffected |
| C. | length of connecting rod |
| D. | input temperature |
| Answer» B. remains unaffected | |
| 21. |
In the turning moment diagram of a multicylinder engine, the work done during exhaust stroke is by |
| A. | the gases |
| B. | on the gases |
| C. | piston wall |
| D. | valve |
| Answer» B. on the gases | |
| 22. |
For a 4 cylinder engine, when the pressure inside the cylinders exceeds the atmospheric pressure then. |
| A. | work is done by the gases |
| B. | work is done on the gases |
| C. | work is done on the piston wall |
| D. | work is done by the piston wall |
| Answer» A. work is done by the gases | |
| 23. |
In a punching press, which of the following quantity is constant? |
| A. | load |
| B. | torque |
| C. | angular velocity |
| D. | angle of rotation |
| Answer» B. torque | |
| 24. |
In a punching press, load is 0 at the time of punching. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 25. |
The maximum shear force required for punching depends on |
| A. | sheared area |
| B. | length of the plate |
| C. | speed of the flywheel |
| D. | total load |
| Answer» A. sheared area | |
| 26. |
A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required. |
| A. | 26.7 kn |
| B. | 53.4 kn |
| C. | 13.35 kn |
| D. | 106.8 kn |
| Answer» A. 26.7 kn | |
| 27. |
The relation between stroke punch s and radius of crank r is |
| A. | s=r |
| B. | s=2r |
| C. | s=4r |
| D. | s=r/2 |
| Answer» B. s=2r | |
| 28. |
If the stroke punch is 100mm, find the radius of the crank in mm. |
| A. | 200 |
| B. | 100 |
| C. | 50 |
| D. | 400 |
| Answer» C. 50 | |
| 29. |
Energy during actual punching operation is same as the energy supplied by the motor. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 30. |
The balance energy required for punching is supplied by the flywheel by |
| A. | increase in its kinetic energy |
| B. | decrease in its kinetic energy |
| C. | decrease in its potential energy |
| D. | by variation of mass |
| Answer» B. decrease in its kinetic energy | |
| 31. |
When the length of the connecting rod is unknown then the value (θ2 –θ1)/2π is equal to |
| A. | t/s |
| B. | t/2s |
| C. | t/2r |
| D. | t/r |
| Answer» B. t/2s | |
| 32. |
The size of a cam depends upon |
| A. | base circle |
| B. | pitch circle |
| C. | prime circle |
| D. | pitch curve |
| Answer» A. base circle | |
| 33. |
The angle between the direction of the follower motion and a normal to the pitch curve is called |
| A. | pitch angle |
| B. | prime angle |
| C. | base angle |
| D. | pressure angle |
| Answer» D. pressure angle | |
| 34. |
The cam follower generally used in automobile engines is |
| A. | knife edge follower |
| B. | flat faced follower |
| C. | spherical faced follower |
| D. | roller follower |
| Answer» C. spherical faced follower | |
| 35. |
The cam follower extensively used in air- craft engines is |
| A. | knife edge follower |
| B. | flat faced follower |
| C. | spherical faced follower |
| D. | roller follower |
| Answer» D. roller follower | |
| 36. |
In a radial cam, the follower moves |
| A. | in a direction perpendicular to the cam axis |
| B. | in a direction parallel to the cam axis |
| C. | in any direction irrespective of the cam axis |
| D. | along the cam axis |
| Answer» A. in a direction perpendicular to the cam axis | |
| 37. |
A radial follower is one |
| A. | that reciprocates in the guides |
| B. | that oscillates |
| C. | in which the follower translates along an axis passing through the cam centre of rotation. |
| D. | none of the mentioned |
| Answer» A. that reciprocates in the guides | |
| 38. |
Ofset is provided to a cam follower mechanism to |
| A. | minimise the side thrust |
| B. | accelerate |
| C. | avoid jerk |
| D. | none of the mentioned |
| Answer» A. minimise the side thrust | |
| 39. |
For low and moderate speed engines, the cam follower should move with |
| A. | uniform velocity |
| B. | simple harmonic motion |
| C. | uniform acceleration and retardation |
| D. | cycloidal motion |
| Answer» B. simple harmonic motion | |
| 40. |
For high speed engines, the cam follower should move with |
| A. | uniform velocity |
| B. | simple harmonic motion |
| C. | uniform acceleration and retardation |
| D. | cycloidal motion |
| Answer» D. cycloidal motion | |
| 41. |
Which of the following displacement diagrams should be chosen for better dynamic performance of a cam-follower mechanism ? |
| A. | simple hormonic motion |
| B. | parabolic motion |
| C. | cycloidal motion |
| D. | none of the mentioned |
| Answer» C. cycloidal motion | |
| 42. |
The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by |
| A. | r(1-cosθ) |
| B. | r(1-sinθ) |
| C. | (r-r1)(1-cosθ) |
| D. | (r-r1)(1-sinθ) |
| Answer» C. (r-r1)(1-cosθ) | |
| 43. |
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 |
| A. | ω2×oq |
| B. | ω2×oqsinθ |
| C. | ω2×oqcosθ |
| D. | ω2×oqtanθ |
| Answer» A. ω2×oq | |
| 44. |
Centre of masses of the system lies on the axis of rotation. |
| A. | 1, 2, 3 and 4 |
| B. | 1, 2, and 3 only |
| C. | 2, 3 and 4 only |
| D. | 1, 3 and 4 only |
| Answer» D. 1, 3 and 4 only | |
| 45. |
Which of the following statements is correct about the balancing of a mechanical system? |
| A. | if it is under static balance, then there will be dynamic balance also |
| B. | if it is under dynamic balance, then there will be static balance also |
| C. | both static as well as dynamic balance have to be achieved separately |
| D. | none of the mentioned |
| Answer» C. both static as well as dynamic balance have to be achieved separately | |
| 46. |
In a locomotive, the ratio of the connecting rod length to the crank radius is kept very large in order to |
| A. | minimize the effect of primary forces |
| B. | minimize the effect of secondary forces |
| C. | have perfect balancing |
| D. | start the locomotive conveniently |
| Answer» B. minimize the effect of secondary forces | |
| 47. |
Multi-cylinder engines are desirable because |
| A. | only balancing problems are reduced |
| B. | only flywheel size is reduced |
| C. | both (a) and (b) |
| D. | none of the mentioned |
| Answer» C. both (a) and (b) | |
| 48. |
Secondary forces in reciprocating mass on engine frame are |
| A. | of same frequency as of primary forces |
| B. | twice the frequency as of primary forces |
| C. | four times the frequency as of primary forces |
| D. | none of the mentioned |
| Answer» B. twice the frequency as of primary forces | |
| 49. |
Work produced by the 4-stroke engine is less because |
| A. | one power stroke per 2 revolutions |
| B. | one power stroke per revolution |
| C. | one power stroke per 4 revolution |
| D. | four power stroke per revolution |
| Answer» A. one power stroke per 2 revolutions | |
| 50. |
When the work is done on the gases, which of the following effect is observed on the turning moment diagram? |
| A. | formation of negative loop |
| B. | formation of positive loop |
| C. | formation of an infinite loop |
| D. | formation of no loop |
| Answer» A. formation of negative loop | |
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