mechanical engineering MCQs – Page 26

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 Review each marked answer and report any item that may be outdated or unclear.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

501. Vapor compression refrigeration is some what like ____________________?
0

A. reversed Camot cycle

B. reversed Rankine cycle

C. Carnot cycle

D. Rankine cycle

E. none of the above

502. 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. 0.5 cm

B. 2.5 cm

C. 0.25 cm

D. 1.0 cm

E. 1.5 cm

503. Thermal conductivity of non-metallic amorphous solids with decrease in temperature __________________?
0

A. increases

B. may increase or decrease depending on temperature

C. remains constant

D. decreases

E. unpredictable

504. Heat conducted througfi unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called__________________?
0

A. thermal conductivity

B. temperature gradient

C. thermal coefficient

D. heat-transfer

E. thermal resistance

505. Effect of a force on a body depends upon ________________?
0

A. magnitude

B. direction

C. none of the above

D. position or line of action

E. all of the above

506. According to Stefans law, the total radiation from a black body per second per unit area is proportional to____________________?
0

A. t

B. l/T

C. T2

D. absolute temperature

E. T5

507. Critical temperature is the temperature above which _____________________?
0

A. a gas will never liquefy

B. water will evaporate

C. water will never evaporate

D. a gas will immediately liquefy

E. none of the above

508. Breeder reactors employ liquid metal coolant because it_______________?
0

A. breeds neutrons

B. acts as good moderator

C. increases rate of reaction in core

D. produces maximum steam

E. transfers heat from core at a fast rate

509. A force acting on a body may_________________?
0

A. introduce internal stresses

B. balance the other forces acting on it

C. retard its motion

D. all of the above

E. change its motion

510. D Alemberts principle is used for______________________?
0

A. stability of floating bodies

B. determining stresses in the truss

C. solving kinematic problems

D. reducing the problem of kinetics to equivalent statics problem

E. designing safe structures

511. 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. maximum

B. infinity

C. zero

D. same as the force applied

E. minimum

512. A grey body is one whose absorptivity_________________?
0

A. does not vary with temperature and. wavelength of the incident ray

B. varies with wavelength of the incident ray

C. is equal to its emissivity

D. varies with temperature

E. none of the above

513. An important characteristic of absorption system of refrigeration is__________________?
0

A. cooling below 0C

B. very little power consumption

C. quiet operation

D. noisy operation

E. its input only in the form of heating

514. A number of forces acting at a point will be in equilibrium if_____________________?
0

A. their total sum is zero

B. two resolved parts in two directions at right angles are equal

C. sum of resolved parts in any two per-pendicular directions are both zero

D. all of them are inclined equally

E. none of the above

515. Temperature of steam at around 540C can be measured by ____________________?
0

A. thermometer

B. thermistor

C. radiatiouv pyrometer

D. thermocouple

E. thermopile

516. In S.J. unit, one ton of refrigeration is equal to___________________?
0

A. 210 kJ/min

B. 840 kJ/min

C. 420 kJ/min

D. 105 kJ/min

E. 21 kJ/min

517. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella___________________?
0

A. none of the above

B. more inclined when moving

C. less inclined when moving

D. more inclined when standing

E. less inclined when standing

518. The value of the wavelength for maximum emissive power is given by ___________________?
0

A. Kirchhoffs law

B. Fouriers law

C. Plancks law

D. Stefans law

E. Wiens law

519. The coefficient of friction depends on________________?
0

A. nature of surface

B. shape of surfaces

C. area of contact

D. strength of surfaces

E. all of the above

520. Which of the following is a case of steady state heat transfer ___________________?
0

A. I.C. engine

B. heating of building in winter

C. air preheaters

D. none of the above

E. all of the above

Previous Next

Showing 501 to 520 of 4266 mcqs