mechanical engineering MCQs – Page 145

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 Review each marked answer and report any item that may be outdated or unclear.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

2881. According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as____________________?
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A. remains constant,if volume and temperature are kept constant

B. absolute temperature, if volume is kept constant

C. volume, if temperature is kept constant

D. temperature

E. absolute

2882. According to first law of thermodynamics_______________________?
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A. mass and energy are mutually convertible

B. heat and work are mutually convertible

C. Carnot engine is most efficient

D. mass and light are mutually convertible

E. heat flows from hot substance to cold substance

2883. Otto cycle consists of following four processes____________________?
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A. two isentropics and two constant pres-sures

B. two isothermals and two isentropics

C. two isentropics and two constant volumes

D. none of the above

E. two isentropics, one constant volume and one constant pressure

2884. Carnot cycle is__________________?
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A. an adiabatic irreversible cycle

B. a quasi static cycle

C. a semi-reversible cycle

D. a reversible cycle (ft) an irreversible cycle

2885. 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 ____________________?
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A. Gay-Lussac law

B. Boyles law

C. Regnaults law

D. Joules law

E. Charles law

2886. According to Avogadros Hypothesis ______________________?
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A. the sum of partial pressure of mixture of two gases is sum of the two

B. all systems can be regarded as closed systems

C. gases have two values of specific heat

D. product of the gas constant and the molecular weight of an ideal gas is constant

E. the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature

2887. During throttling process___________________?
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A. there is no change of internal energy of steam

B. entropy decreases

C. no work is done by expanding steam

D. heat exchange does not take place

E. all of the above

2888. Which of the following items is not a path function ____________________?
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A. vdp

B. kinetic energy

C. heat

D. work

E. thermal conductivity

2889. Carnot cycle has maximum efficiency for__________________?
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A. reversible engine

B. irreversible engine

C. petrol engine

D. new engine

E. diesel engine

2890. The unit of energy in S.I. units is________________?
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A. joule/s

B. joule

C. joule/m

D. joule m.

E. watt

2891. I kgf/cm2 is equal to________________?
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A. 1 mm Hg

B. lOOmmHg

C. 735.6 mm Hg

D. 760 mm Hg

E. zero mm Hg

2892. An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is___________________?
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A. desirable

B. possible

C. possible, but with lot of sophistications

D. impossible

E. feasible

2893. The unit of power in S.I. units is_______________________?
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A. watt

B. erg

C. newton

D. pascal

E. joule

2894. The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will______________?
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A. remain unchanged

B. decrease

C. increase/decrease depending on ap-plication

D. unpredictable

E. increase

2895. The unit of temperature in S.I. units is _________________?
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A. Kelvin

B. Fahrenheit

C. Centigrade

D. Celsius

E. Rankine

2896. Gas turbine cycle consists of___________________?
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A. none of the above

B. two isentropics and two constant pressures

C. two isentropics, one constant volume and one constant pressure

D. two isentropics and two constant volumes

E. two isothermals and two isentropics

2897. Kinetic theory of gases assumes that the collisions between the molecules are________________?
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A. perfectly inelastic

B. perfectly elastic

C. partly inelastic

D. partly elastic and partly inelastic

E. partly elastic

2898. Zeroth law of thermodynamics________________?
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A. deals with conversion of mass and energy

B. deals with reversibility and irreversibility of process

C. states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

D. deals with heat engines

E. does not exist

2899. Which of the following variables controls the physical properties of a perfect gas_________________?
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A. temperature

B. all of the above

C. pressure

D. volume

E. atomic mass

2900. Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure___________________?
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A. specific volume

B. entropy

C. mass

D. enthalpy

E. volume

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