mechanical engineering MCQs – Page 48

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 Review each marked answer and report any item that may be outdated or unclear.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

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

942. Which of the following quantities is not the property of the system__________________?
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A. specific volume

B. pressure

C. heat

D. temperature

E. density

943. The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is______________________?
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A. 29.27 kgfm/molK

B. 427kgfm/molK

C. 848kgfm/molK

D. 735 kgfm/molK

E. 8314kgfm/molK

944. Inertia force acts___________________?
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A. along the direction of accel* force

B. in any direction w.r.t. accel* force depending on the magnit two

C. perpendicular to the accel< force

D. opposite to the direction of ace ing force

E. none of the above

945. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are__________________?
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A. cyclic functions

B. thermodynamic functions

C. point functions

D. path functions

E. real functions

946. Pick up the incorrect statement from the following ?
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A. The C.G. of a rectangle is at the inter-section of its diagonals

B. The C.G. of a circle is at its center

C. The C.G. of a semicircle is at a distance of r/2 from the center

D. The C-G. of an ellipse is at its center

E. The C.G. of a triangle is at the intersection of its medians

947. I kgf/cm2 is equal to________________?
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A. lOOmmHg

B. 735.6 mm Hg

C. 760 mm Hg

D. 1 mm Hg

E. zero mm Hg

948. Guests theory of failure is applicable for following type of materials_________________?
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A. tough

B. brittle

C. plastic

D. elastic

E. ductile

949. An adiabatic wall is one which__________________?
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A. encourages thermal interaction

B. discourages thermal interaction

C. permits thermal interaction

D. dos not exist.

E. prevents thermal interaction

950. The statement that molecular weights of all gases occupy the same volume is known as________________?
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A. Law of thermodynamics

B. Joules law

C. Gas law

D. Daltons law

E. Avogadros hypothesis

951. The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be_________________?
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A. same in both cases

B. 2 times more

C. 3 times more

D. 4 times more

E. unpredictable

952. The term N.T.P. stands for________________________?
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A. natural temperature and pressure

B. normal thermodynamic pressure

C. nominal temperature and pressure

D. normal temperature and pressure

E. normal thermodynamic practice

953. Which of the following is the property of a system___________________?
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A. all of the above

B. internal energy

C. enthalpy and entropy

D. pressure and temperature

E. volume and density

954. Which law states that the internal energy of a gas is a function of temperature__________________?
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A. Charles law

B. Boyles law

C. Joules law

D. there is no such law

E. Regnaults law

955. 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

956. The unit of mass in S.I. units is ____________________?
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A. gram

B. newton

C. tonne

D. quintal

E. kilogram

957. According to first law of thermodynamics__________________?
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A. total energy of a system remains constant

B. entropy of a system remains constant

C. total internal energy of a system during a process remains constant

D. internal energy, enthalpy and entropy during a process remain constant

E. work done by a system is equal to heat transferred by the system

958. The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will_________________?
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A. increase/decrease depending on application

B. remain unchanged

C. increase

D. decrease

E. unpredictable

959. The number of links and instantaneous centers in a reciprocating engine mechanism are ___________________?
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A. 5, 4

B. 6, 4

C. 4, 6

D. 4, 4

E. 4, 5

960. In a Carnot cycle, heat is transferred at_______________________?
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A. constant enthaply

B. constant temperature

C. constant volume

D. constant pressure

E. any one of the above

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