mechanical engineering MCQs – Page 177

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

3521. D Alemberts principle is used for______________________?
0

A. determining stresses in the truss

B. reducing the problem of kinetics to equivalent statics problem

C. designing safe structures

D. stability of floating bodies

E. solving kinematic problems

3522. Coefficient of friction is the_________________?
0

A. angle between normal reaction and the resultant of normal reaction and the limiting friction

B. tangent of angle of repose

C. the friction force acting when the body is in motion

D. ratio of limiting friction and normal reaction

E. the friction force acting when the body is just about to move

3523. Forces are called concurrent when their lines of action meet in________________?
0

A. perpendicular planes

B. one point

C. different planes

D. plane

E. two points

3524. According to Lamis theorem___________________?
0

A. three forces acting at a point can be represented by a triangle, each side being proportional to force

B. none of the above

C. if three forces acting upon a particle are represented in magnitude and

D. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

E. three forces acting at a point will be in equilibrium

F. ection by the sides of a triangle, taken in order, they will be in equilibrium

3525. The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be_________________?
0

A. r/2

B. 2r/3

C. 3r/2

D. 3r/A

E. r/A

3526. Which of the following is a vector quantity___________________?
0

A. momentum

B. energy

C. angle

D. mass

E. speed

3527. The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to _________________?
0

A. Wcos(a + )

B. Wsin(a + )

C. Wtan(a-)

D. Wtan(a + )

E. W (sin a + cos ).

3528. The center of gravity of a uniform lamina lies at____________________?
0

A. none of the above

B. the center of heavy portion

C. the bottom surface

D. the mid point of its axis

E. all of the above

3529. A force is completely defined when we specify_______________?
0

A. point of application

B. all of the above

C. direction

D. none of the above

E. magnitude

3530. Which of the following do not have identical dimensions ?
0

A. Torque and work

B. Torque and energy

C. Momentum and impulse

D. Moment of a force and angular momentum

E. Kinetic energy and potential energy

3531. A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is \i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?
0

A. slant up towards direction of pull

B. slant down towards direction of pull

C. none of the above

D. unpredictable

E. remain horizontal

3532. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t 4), the acceleration of the particle will be given by the equation __________________?
0

A. 6f-4

B. 3t2-lt

C. 6f-8

D. 6t2-8t

E. 3t2+2t

3533. The unit of power in S.I. units is______________?
0

A. joule

B. pascal per sec

C. newton meter

D. watt

E. kilogram meter/sec

3534. Forces are called coplanar when all of them acting on body lie in __________________?
0

A. one point

B. different points

C. perpendicular planes

D. different planes

E. one plane

3535. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly_________________?
0

A. 124 m

B. 96 m

C. 38 m

D. 240 m

E. 62.5 m

3536. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to________________?
0

A. W

B. Wtan(a +

C. W\an(a-)

D. W sin (a + $)

E. Wtana

3537. The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is__________________?
0

A. one fourth

B. same

C. double

D. half

E. four times

3538. Tangent of angle of friction is equal to__________________?
0

A. kinetic friction

B. limiting friction

C. friction force

D. coefficient of friction

E. angle of repose

3539. The C.G. of a right circular solid cone of height h lies at the following distance from the base______________?
0

A. h/6

B. J/3

C. h/4

D. 3/i/5

E. h/2

3540. The co-efficient of friction depends upon_______________?
0

A. A. and B. above

B. nature of surfaces

C. ail of the above.

D. shape of the surfaces

E. area of contact

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