mechanical engineering MCQs – Page 147

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 Review each marked answer and report any item that may be outdated or unclear.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

2921. Compressed air coming out from a punctured football___________________?
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A. attains atmospheric temperature

B. may become hotter or cooler depend-ing upon the humidity of the surrounding air

C. becomes hotter

D. becomes cooler1

E. remains at the same temperature

2922. First law of thermodynamics furnishes the relationship between______________________?
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A. various thermodynamic processes

B. heat, work and properties of the system

C. heat and internal energy

D. various properties of the system

E. heat and work

2923. General gas equation is____________________?
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A. PV=KiRT

B. PV=nRT

C. Cp-Cv = Wj

D. PV = C

E. PV=mRT

2924. The value of n = 1 in the poly tropic process indicates it to be __________________?
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A. irreversible process

B. isothermal process

C. reversible process

D. adiabatic process

E. free expansion process

2925. An isolated system is one in which_____________________?
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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

2926. If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called___________________?
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A. free expansion

B. adiabatic expansion

C. throttling

D. parabolic expansion

E. hyperbolic expansion

2927. One watt is equal to__________________?
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A. 1 N/mt

B. 1 kNm/hr

C. 1 Nm/s

D. 1 Nm/hr

E. 1 kNm/mt

2928. Characteristic gas constant of a gas is equal to______________________?
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A. Cv/Cp

B. Cp x Cv

C. C/Cv

D. Cp Cv

E. Cp + Cv

2929. Which of the following is an irreversible cycle_____________________?
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A. all of the above

B. carnot

C. ericsson

D. none of the above

E. Stirling

2930. The specific heat of air increases with increase in __________________?
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A. temperature

B. pressure

C. both pressure and temperature

D. variation of its constituents

E. air flow

2931. Change in enthalpy of a system is the heat supplied at___________________?
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A. constant entropy

B. constant pressure

C. constant volume

D. N.T.P. condition

E. constant temperature

2932. A diathermic wall is one which____________________?
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A. permits thermal interaction

B. discourages thermal interaction

C. does not exist

D. prevents thermal interaction

E. encourages thermal interaction

2933. The behaviour of gases can be fully determined by___________________?
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A. 3 laws

B. 2 laws

C. 4 laws

D. 1 law

2934. Temperature of a gas is produced due to________________?
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A. kinetic energy of molecules

B. its heating value

C. repulsion of molecules

D. surface tension of molecules

E. attraction of molecules

2935. Which of the following quantities is not the property of the system__________________?
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A. pressure

B. specific volume

C. density

D. temperature

E. heat

2936. In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about_______________?
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A. 100 xlOO5 joules

B. 10 xlO5 kilo joules

C. lxlO5 joules

D. 10xl04kiojoules

E. 10 xlO5 joules

2937. According to Daltons law, the total pres sure of the mixture of gases is equal to________________?
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A. greater of the partial pressures of all

B. atmospheric pressure

C. average of the partial pressures of all

D. sum of the partial pressures of all

E. sum of the partial pressures of all divided by average molecular weight

2938. Which law states that the internal energy of a gas is a function of temperature__________________?
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A. there is no such law

B. Regnaults law

C. Joules law

D. Charles law

E. Boyles law

2939. Mixture of ice and water form a________________________?
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A. open system

B. isolated system

C. closed system

D. heterogeneous system

E. thermodynamic system.

2940. Carnot cycle efficiency depends upon________________?
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A. effectiveness of insulating material around the engine

B. condition of engine

C. working condition

D. properties of the medium/substance used

E. temperature range of operation

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