mechanical engineering MCQs – Page 178

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 Review each marked answer and report any item that may be outdated or unclear.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

3541. Coulomb friction is the friction between _________________?
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A. bodies having relative motion

B. two dry surfaces

C. electrically charged particles

D. solids and liquids

E. two lubricated surfaces

3542. Which of the following is not the unit of energy_________________?
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A. kcal

B. kg m

C. wattr

D. watt hours

E. kg m x (m/sec)2

3543. A single force and a couple acting in the same plane upon a rigid body_____________________?
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A. are equivalent

B. balance each other

C. none of the above

D. produce moment of a couple

E. cannot balance each other

3544. Center of gravity of a thin hollow cone lies on the axis at a height of ___________________?
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A. none of the above

B. one-half of the total height above base

C. one-fourth of the total height above base

D. three-eighth of the total height above the base

E. one-third of the total height above base

3545. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve ____________________?
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A. hyperbola

B. catenary

C. parabola

D. circular arc

E. elliptical

3546. Limiting force of friction is the__________________?
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A. ratio of limiting friction and normal reaction

B. tangent of angle between normal-reaction and the resultant of normal reaction and limiting friction

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

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

E. minimum force of friction

3547. A pair of smiths tongs is an example of the lever of__________________?
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A. zeioth order

B. second order

C. fourth order

D. third order

E. first order

3548. Which of the following is not the unit of power ?
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A. kcal/sec

B. kcal/kg sec

C. hp (horse power)

D. kW (kilowatt)

E. kg m/sec

3549. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be_________________?
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A. upwards at its upper end

B. none of the above

C. perpendicular to the wall at its upper end

D. zero at its upper end

E. downwards at its upper end

3550. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal_________________?
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A. density of metal cant be determined

B. none of the above

C. metal is twice as dense as water

D. metal will float in water

E. metal is twice as dense as unknown fluid

3551. A force acting on a body may_________________?
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A. balance the other forces acting on it

B. retard its motion

C. change its motion

D. all of the above

E. introduce internal stresses

3552. The C.G. of a plane lamina will not be at its geometrical centre in the case of a__________________?
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A. rectangle

B. circle

C. square

D. equilateral triangle

E. right angled triangle

3553. If n = number of members andy = number of joints, then for a perfect frame, n =_________________?
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A. 2/ -4

B. 3/-2

C. 2/-3

D. 2j-l

E. j-2

3554. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of_______________?
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A. friction

B. limiting friction

C. static friction

D. kinematic friction

E. repose

3555. The weight of a body is due to ___________________?
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A. forces experienced by body in atmosphere

B. gravitational force of attraction towards the center of the earth

C. centripetal force of earth

D. gravitational pull exerted by the earth

E. force of attraction experienced by particles

3556. If a rigid body is in equilibrium under the action of three forces, then _____________________?
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A. these forces are equal

B. B. and C. above

C. none of the above

D. the lines of action of these forces meet in a point

E. the lines of action of these forces are parallel

3557. In actual machines_______________?
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A. mechanical advantage is less than velocity ratio

B. mechanical advantage is unity

C. none of the above

D. mechanical advantage is greater than velocity ratio

E. mechanical advantage is equal to velocity ratio

3558. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_______________?
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A. 0

B. 90.

C. 45

D. 60

E. 30

3559. Which of the following is not the unit of pressure ?
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A. kg/cm

B. atmosphere

C. ata

D. newton

E. mm of wcl

3560. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of__________________?
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A. forces

B. resolution of forces

C. dependence of forces

D. independence of forces

E. balance of force

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