mechanical engineering MCQs – Page 93

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 Review each marked answer and report any item that may be outdated or unclear.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

1841. Eulers dimensionless number relates the following__________________?
0

A. viscous force and buoyancy force

B. pressure force and inertial force

C. viscous force and inertial force

D. inertial force and gravity

E. pressure force and viscous force

1842. Density of water is maximum at__________________?
0

A. 4C

B. 0K

C. 100C

D. 20C.

E. 0C

1843. Caking coals are those which __________________________?
0

A. form lumps or masses of coke

B. show little or no fusing action

C. burn completely

D. burn freely

E. do not form ash

1844. The number of drums in Benson steam generator is_________________?
0

A. none of the above

B. one

C. two

D. one steam drum and one water drum

E. no drum

1845. A large Roynold number is indication of________________?
0

A. highly turbulent flow

B. smooth and streamline flow

C. laminar flow

D. turbulent flow

E. steady flow

1846. Cavitation is caused by_____________________?
0

A. high velocity

B. weak material

C. low pressure

D. high pressure

E. low viscosity

1847. Water and sediment in fuel oil can be removed by _______________________?
0

A. heating the oil in the settling tanks

B. cooling the oil in the settling tanks

C. burning the oil

D. filtering

E. suspension

1848. Water tube boilers are those in which________________?
0

A. change in enthalpy

B. water passes through the tubes and flue gases around it

C. work is done during adiabatic expansion

D. flue gases pass through tubes and water around it

E. none of the above

1849. Latent heat of dry steam at atmospneric pressure is equal to____________________?
0

A. 471 kcal/kg

B. 539 BTU/lb

C. 100 kcal/kg

D. 427 kcal/kg

E. 539 kcal/kg

1850. Stoichiometric quantity of air is the___________________?
0

A. air required for complete combustion of fuel with no excess air

B. air required to convert CO into C02

C. air required to form an explosive mixture

D. air required for optimum combustion so as to have reasonable excess air

E. air present in atmosphere at NTP conditions

1851. The saturation temperature of steam with increase in pressure increases____________________?
0

A. linearly

B. slowly first and then rapidly

C. rapidly first and then slowly

D. inversely

E. none of the above

1852. The ratio of absolute viscosity to mass density is known as_________________?
0

A. coefficient of viscosity

B. viscosity index

C. specific viscosity

D. coefficient of compressibility

E. kinematic viscosity

1853. Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be_______________?
0

A. 1000 kg

B. 8000 kg

C. 2000 kg

D. 4000 kg

E. 16000 kg

1854. In accelerated circulation type boiler________________?
0

A. water is fed under high pressure and high velocity

B. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of stdam bubbles and hot water which rise to durm

C. feed pump is employed to supplement natural circulation in water wall type furnace

D. water is converted into steam in one pass without any recirculation

E. water is supplied in drum and through downcomers located in atmospheric conditon it passes to the water wall and rises to durm in the from of mixture of water and steam

1855. A body floats in stable equilibrium ____________________?
0

A. metacentre has nothing to do with position of e.g. for determining stability

B. none of the above

C. when the metancentre is above e.g.

D. when its meatcentric height is zero

E. when its e.g. is below its center of buoyancy

1856. Working principle of dead weight pressure gauge tester is based on_______________?
0

A. Daltons law of partial pressure

B. Newtons law of viscosity .

C. Pascals law

D. Avogadros hypothesis

E. Second law of thermodynamic