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. |
Why the inertia torque acts in the opposite direction to the accelerating couple? |
| A. | bring the body in equilibrium |
| B. | to reduce the accelerating torque |
| C. | acts as a constraint torque |
| D. | increase the linear acceleration |
| Answer» A. bring the body in equilibrium | |
| 7. |
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 | |
| 8. |
Inertia force and the reversed effective force are the same. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 9. |
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 | |
| 10. |
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 | |
| 11. |
The net force acting on the crosshead pin is known as |
| A. | crank pin effort |
| B. | crank effort |
| C. | piston effort |
| D. | shaft effort |
| Answer» C. piston effort | |
| 12. |
Piston effort acts along the line of stroke. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 13. |
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 | |
| 14. |
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 | |
| 15. |
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) | |
| 16. |
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) | |
| 17. |
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 | |
| 18. |
In a horizontal engine, the weight of the reciprocating parts also add/subtract to the piston effort. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 19. |
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 | |
| 20. |
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 | |
| 21. |
2 m and the cylinder bore is 0.5 m. engine runs at 250 r.p.m & 30° from T.D.C. Find the piston effort. |
| A. | 32.4 kn |
| B. | 35.2 kn |
| C. | 37.3 kn |
| D. | 40.2 n |
| Answer» C. 37.3 kn | |
| 22. |
Multi cylinder engines are usually placed at an equal inclination to each other. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 23. |
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 | |
| 24. |
For a 4 cylinder engine, if the minimum speed of the engine is half the maximum speed, then coefficient of fluctuation is |
| A. | 0.5 |
| B. | 1.5 |
| C. | 2 |
| D. | 0.66 |
| Answer» D. 0.66 | |
| 25. |
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 | |
| 26. |
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 | |
| 27. |
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 | |
| 28. |
In a punching press, load is 0 at the time of punching. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 29. |
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 | |
| 30. |
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 | |
| 31. |
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 | |
| 32. |
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 | |
| 33. |
Energy during actual punching operation is same as the energy supplied by the motor. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 34. |
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 | |
| 35. |
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 | |
| 36. |
The size of a cam depends upon |
| A. | base circle |
| B. | pitch circle |
| C. | prime circle |
| D. | pitch curve |
| Answer» A. base circle | |
| 37. |
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 | |
| 38. |
A circle drawn with centre as the cam centre and radius equal to the distance between the cam centre and the point on the pitch curve at which the pressure angle is maximum, is called |
| A. | base circle |
| B. | pitch circle |
| C. | prime circle |
| D. | none of the mentioned |
| Answer» B. pitch circle | |
| 39. |
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 | |
| 40. |
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 | |
| 41. |
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 | |
| 42. |
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 | |
| 43. |
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 | |
| 44. |
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 | |
| 45. |
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 | |
| 46. |
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 | |
| 47. |
The linear velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by |
| A. | ω(r1-r2)sinθ |
| B. | ω(r1-r2)cosθ |
| C. | ωr1+r2)sinθsec2θ |
| D. | ω(r1+r2)cosθcosec2θ |
| Answer» C. ωr1+r2)sinθsec2θ | |
| 48. |
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) | |
| 49. |
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 | |
| 50. |
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 | |
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