mechanical engineering MCQs – Page 53

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 Review each marked answer and report any item that may be outdated or unclear.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

1041. The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line________________?
0

A. perpendicular to line as per A.

B. joining the corresponding points

C. none of the above

D. not possible to determine with these data

E. at 45 to line as per A.

1042. Angle of ascent of cam is defined as the angle___________________?
0

A. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

B. through which the cam rotates during the period in which the follower remains in highest position

C. during which the follower returns to its initial position

D. of rotation of the cam for a definite displacement of the follower

E. moved by the cam from beginning oi ascent to the termination of descent

1043. In a shaper mechanism, the Coriolis component of acceleration will_______________?
0

A. not exist

B. unpredictable

C. depend on position of crank

D. exist

E. none of the above

1044. Universal gas constant is defined as equal to product of the molecular weight of the gas and_______________?
0

A. specific heat at constant pressure

B. ratio of two specific heats

C. specific heat at constant volume

D. unity.

E. gas constant

1045. The value of n = 1 in the poly tropic process indicates it to be __________________?
0

A. reversible process

B. adiabatic process

C. isothermal process

D. irreversible process

E. free expansion process

1046. Stress concentration in static loading is more serious in__________________?
0

A. ductile materials

B. brittle materials

C. equally serious in both cases

D. depends on other factors

E. unpredictable

1047. The following cycle is used for air craft refrigeration___________________?
0

A. Bell-Coleman cycle

B. Reversed-Brayton cycle

C. Brayton cycle

D. Joule cycle

E. Carnot cycle

1048. No liquid can exist as liquid at____________________?
0

A. centre of earth

B. in space

C. zero pressure

D. vacuum

E. 273 K

1049. Kleins construction can be used when_________________?
0

A. crank has uniform angular velocity and angular acceleration

B. there is no such criterion

C. crank has a uniform angular velocity

D. crank has uniform angular acceleration

E. crank has non-uniform velocity

1050. According to which law, all perfect gases change in volume by l/273th of their original volume at 0C for every 1C change in temperature when pressure remains constant ____________________?
0

A. Regnaults law

B. Boyles law

C. Joules law

D. Gay-Lussac law

E. Charles law

1051. A cycle consisting of two adiabatics and two constant pressure processes is known as___________________?
0

A. Joule cycle

B. Stirling cycle

C. Ericsson cycle

D. Otto cycle

E. Atkinson cycle

1052. Which is the false statement about the properties of instantaneous center____________________?
0

A. none of the above

B. the two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

C. the two rigid links have no linear velocities relative to each other at the instantaneous centre

D. at the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

E. the double centre can be denoted either by 02 or Ol2, but proper selection should be made

1053. Cam angle is defined as the angle_________________?
0

A. through which, the cam rotates during the period in which the follower remains in the highest position

B. moved by the can from beginning of i ascent to the termination of descent

C. of rotation of the cam for a definite displacement of the follower

D. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

E. during which the follower returns to its initial position

1054. Coriolis component is encountered in_________________?
0

A. A. and C. above

B. slider crank mechanism

C. all of the above.

D. four bar chain mechanism

E. quick return mechanism of shaper

1055. Superheated vapour behaves___________________?
0

A. as average of gas and vapour

B. exactly as gas

C. as steam

D. as ordinary vapour

E. approximately as a gas

1056. Which of the following is not correct procedure to increase the fatigue limit_______________?
0

A. cold working

B. shot peening

C. under-stressing

D. surface decarburisation

E. all of the above

1057. Mixture of ice and water form a________________________?
0

A. closed system

B. heterogeneous system

C. open system

D. thermodynamic system.

E. isolated system

1058. An open system is one in which____________________?
0

A. mass does not cross boundaries of the system, though energy may do so

B. neither mass nor energy crosses the boundaries of the system

C. both energy and mass cross the boundaries of the system

D. mass crosses the boundary but not the energy

E. thermodynamic reactions do not occur

1059. A heat exchange process in which the product of pressure and volume remains constant is known as_______________?
0

A. heat exchange process

B. adiabatic process

C. isentropic process

D. throttling process

E. hyperbolic process

1060. In above example, the minimum length of the coupler will be__________________?
0

A. slightly less than 45 mm

B. 95 mm

C. 45 mm

D. slightly more than 45 mm

E. none of the above

Previous Next

Showing 1041 to 1060 of 4266 mcqs