mechanical engineering MCQs – Page 146

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 Review each marked answer and report any item that may be outdated or unclear.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

2901. Molecular volume of any perfect gas at 600 x 103 N/m2 and 27C will be ____________________?
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A. 0.15 m3/kg mol

B. 400 m3/kg mol

C. 417m3/kgmol

D. 4.17m3/kgmol

E. 41.7 m3/kg mol

2902. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at ____________________?
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A. a temperature of 273.16C

B. a temperature of 0C

C. a temperature of 273 K

D. a negative pressure and 0C temperature

E. cant be attained

2903. Absolute zero pressure will occur _____________________?
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A. at the center of the earth

B. at sea level

C. when molecular momentum of the system becomes zero

D. at a temperature of 273 K

E. under vacuum conditions

2904. Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?
0

A. 2

B. 1

C. 0.75

D. 1.35

E. 1.27

2905. Which of the following is not the intensive property___________________?
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A. density

B. specific volume

C. heat

D. pressure

E. temperature

2906. Heat and work are ____________________?
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A. system properties

B. path functions

C. point functions

D. intensive properties

E. extensive properties

2907. The following cycle is used for air craft refrigeration___________________?
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A. Brayton cycle

B. Joule cycle

C. Reversed-Brayton cycle

D. Carnot cycle

E. Bell-Coleman cycle

2908. A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?
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A. 300 Nm

B. 300,000 Nm

C. 3000 Nm

D. 30,000 Nm

E. 30 Nm

2909. The door of a running refrigerator inside a room was left open____________________?
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A. ch of the following statements is correct ?

2910. A perfect gas at 27C is heated at constant pressure till its volume is double. The final temperature is________________?
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A. 327C

B. 54C

C. 108C

D. 654C

E. 600C

2911. If a system after undergoing a series of processes, returns to the initial state then__________________?
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A. its entropy will change due to irreversibility

B. process is thermodynamically in equilibrium

C. process is executed in closed system cycle

D. no work will be done by the system

E. sum of heat and work transfer will be zero

2912. The index of compression n tends to reach ratio of specific heats y when____________________?
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A. process is isentropic and specific heat does not change with temperature

B. flow is uniform and steady

C. process is isentropic

D. process is isentropic and specific heat changes with temperature

E. process is isothermal

2913. According to Avogadros law, for a given pressure and temperature, each molecule of a gas_________________?
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A. occupies volume proportional to its molecular weight

B. occupies volume proportional to its specific weight

C. occupies volume inversely proportional to its molecular weight

D. occupies volume inversely proportional to its specific weight

E. occupies same volume

2914. The unit of pressure in S.I. units is____________________?
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A. dynes per square cm

B. bars

C. kg/cm2

D. mm of water column

E. pascal

2915. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?
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A. volume

B. entropy

C. pressure

D. internal energy

E. temperature

2916. Universal gas constant is defined as equal to product of the molecular weight of the gas and_______________?
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A. gas constant

B. specific heat at constant pressure

C. ratio of two specific heats

D. specific heat at constant volume

E. unity.

2917. In an isothermal process, the internal energy________________?
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A. first decreases and then increases

B. increases

C. decreases

D. remains constant

E. first increases and then decreases

2918. Work done is zero for the following process_________________?
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A. free expansion

B. none of the above

C. all Of the above

D. throttling

E. constant volume

2919. Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits ?
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A. steam vapours, H2, C02

B. 02, N2, H2, air

C. 02, N2, steam, C02

D. S02, NH3, C02, moisture

E. Oz, N2, water vapour

2920. The first law of thermodynamics is the law of_________________?
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A. conservation of energy

B. conservation of momentum

C. conservation of mass

D. conservation of heat

E. conservation of temperature

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