mechanical engineering MCQs – Page 29

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 Review each marked answer and report any item that may be outdated or unclear.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

561. Which is the correct statement about law of polygon of forces ?
0

A. none of the above.

B. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

C. if any number of forces acting at a point can be represented by the sides

D. a polygon taken in order, then the forces are in equilibrium

E. if a polygon representing forces acting at a point is closed then forces are in equilibrium

F. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

562. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if____________________?
0

A. the floor is smooth, the wall is rough

B. the floor is rough, the wall is smooth

C. the floor and wall both are smooth surfaces

D. the floor and wall both are rough surfaces

E. will be in equilibrium under all conditions

563. When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by __________________?
0

A. conduction

B. conduction and convection

C. convection and radiation

D. radiation

E. convection

564. Thermal diffusivity is ____________________?
0

A. function of temperature

B. used as mathematical model

C. a dimensionless parameter

D. useful in case of heat transfer by radiation

E. a physical property of the material

565. A refrigeration cycle operates between condenser temperature of + 27C and evaporator temperature of- 23C. The Cannot coefficient of performance of cycle will be_________________?
0

A. 1.2

B. 0.2

C. 6

D. 5

E. 10

566. The impact strength of a material is an index of its ___________________?
0

A. capability of being cold worked

B. toughness

C. fatigue strength

D. hardness

E. tensile strength

567. The value of modulus of elasticity for mild steel is of the order of________________?
0

A. 2.1 x 107 kg/cm2

B. 2.1 X 106 kg/cm2

C. 0.1 xlO6 kg/cm2 (<?) 3.8 x 106 kg/cm2

D. 2.1xl05 kg/cm2

568. A universal joint is an example of_____________________?
0

A. rolling pair

B. sliding pair

C. higher pair

D. lower pair

E. turning pair

569. In vapour compression cycle using NH3 as refrigerant, initial charge is filled at_________________?
0

A. low pressure side near receiver

B. suction of compressor

C. delivery of compressor

D. high pressure side close to receiver

E. anywhere in the cycle

570. The total strain energy stored in a body is termed as__________________?
0

A. resilience

B. impact energy

C. toughness

D. modulus of resilience

E. proof resilience

571. A foot step bearing and rotor of a vertical turbine form examples of___________________?
0

A. partially constrained motion

B. completely constrained motion

C. incompletely constrained motion

D. successfully constrained motion

E. none of the above

572. Cross head and guides form a _________________?
0

A. higher pair

B. turning pair

C. lower pair

D. rolling pair

E. sliding pair

573. For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimidstroke respectively, is__________________?
0

A. maximum and minimum

B. zero and minimum

C. zero and maximum

D. maximum and zero

E. minimum and maximum

574. If a part is constrained to move and heated, it will develop ____________________?
0

A. shear stress

B. compressive stress

C. tensile stress

D. principal stress

E. no stress

575. T Jie horse power transmitted by a belt is dependent upon _________________?
0

A. speed of pulley

B. tension on slack side of belt

C. radius of pulley

D. tension on tight side of belt

E. all of the above

576. Flow stress corresponds to___________________?
0

A. none of the above

B. breaking point

C. fluids in motion

D. rupture stress

E. plastic deformation of solids

577. The purpose of a link is to________________?
0

A. guide other links

B. all of the above

C. none of the above

D. act as a support

E. transmit motion

578. In elliptical trammels_________________?
0

A. two pairs turning and two pairs sliding

B. one pair turning and three pairs sliding

C. all four pairs sliding

D. all four pairs are turning

E. three pairs turning and one pair sliding

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

A. h/2

B. h/4

C. h/6

D. 3/i/5

E. J/3

580. Formation of frost on evaporator in refrigerator ________________?
0

A. results in loss of heat due to poor heat transfer

B. can be avoided by proper design

C. decreases compressor power

D. is immaterial

E. increases heat transfer rate

Previous Next

Showing 561 to 580 of 4266 mcqs