mechanical engineering MCQs – Page 180

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 Review each marked answer and report any item that may be outdated or unclear.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

3581. From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the center of circular plate____________________?
0

A. 0.25 cm

B. 2.5 cm

C. 1.0 cm

D. 0.5 cm

E. 1.5 cm

3582. Angle of friction is the_______________________?
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A. the ratio of minimum friction force to friction force acting when the body is in motion

B. ratio of limiting friction and normal reaction

C. ratio of static and dynamic friction

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

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

3583. If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be_________________?
0

A. infinity

B. same as the force applied

C. maximum

D. zero

E. minimum

3584. In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than____________________?
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A. three members with known forces of the frame

B. four members with two known forces

C. four members with unknown forces of the frame

D. three members with unknown forces of the frame

E. two members with unknown forces of the frame

3585. Which one of the following statements is not correct_________________?
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A. the tangent of the angle of repose is equal to coefficient of friction

B. the angle of repose is equal to angle of friction

C. none of the above

D. the sine of the angle of repose is equal to coefficient to friction

E. the tangent of the angle of friction is equal to coefficient of friction

3586. A framed structure is perfect if it contains members equal to_________________?
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A. n 2

B. 2n-3

C. re n = number of joints in a frame

D. 3n-2.

E. n-l

F. 2n-l

3587. Frictional force encountered after commencement of motion is called ___________________?
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A. frictional resistance

B. limiting friction

C. kinematic friction

D. dynamic friction

E. post friction

3588. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction___________________?
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A. unpredictable

B. along the plane

C. horizontally

D. vertically

E. at an angle equal to the angle of friction to the inclined plane

3589. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span___________________?
0

A. 2.0 cm

B. 5.0 cm

C. 2.5 cm

D. 3.0 cm

E. 4.0 cm

3590. In the equation of virtual work, following force is neglected_______________________?
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A. reaction of any smooth surface with which the body is in contact

B. reaction of a rough surface of a body which rolls on it without slipping

C. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn

D. all of the above

E. none of the above

3591. Pick up the incorrect statement from the following ?
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A. The C.G. of a rectangle is at the inter-section of its diagonals

B. The C.G. of a triangle is at the intersection of its medians

C. The C.G. of a circle is at its center

D. The C.G. of a semicircle is at a distance of r/2 from the center

E. The C-G. of an ellipse is at its center

3592. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be__________________?
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A. 10 kg, + ve sense

B. 45 kg, + ve sense

C. 20 kg, ve sense

D. 10 kg, ve sense

E. 20 kg, + ve sense

3593. Two coplanar couples having equal and opposite moments_________________?
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A. can not balance each other

B. are equivalent

C. produce a couple and an unbalanced force

D. produce a moment of couple

E. balance each other

3594. The center of gravity of a triangle lies at the point of __________________?
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A. intersection of its altitudes

B. intersection of diagonals

C. all of the above

D. concurrence of the medians

E. intersection of bisector of angles

3595. The possible loading in various members of framed structures are_________________?
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A. shear or tension

B. all of the above

C. compression or tension

D. bending

E. buckling or shear

3596. The ratio of limiting friction and normal reaction is known as _____________________?
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A. angle of friction

B. friction resistance

C. sliding friction

D. coefficient of friction

E. angle of repose

3597. The coefficient of friction depends on________________?
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A. shape of surfaces

B. nature of surface

C. strength of surfaces

D. all of the above

E. area of contact

3598. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be___________________?
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A. downwards at its upper end

B. towards the wall at its upper end

C. none of the above

D. away from the wall at its upper end

E. upwards at its upper end

3599. Rain drops are spherical because of__________________?
0

A. air resistance

B. none of the above

C. viscosity

D. surface tension forces

E. atmospheric pressure

3600. An ideal flow of any fluid must fulfill the following____________________?
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A. Continuity equation

B. Newtons law of viscosity

C. Pascal law

D. Newtons law of motion

E. Boundary layer theory

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