Mechanical Engineering MCQ Questions and Answers Quiz

21. Function of piston rings is

  1. To connect piston and connecting road
  2. To transmit force from piston to crank
  3. To maintain a gas tight between the piston and the cylinder
  4. To convert reciprocating motion into rotary motion

22. If xl and x2 are the dryness fractions obtained in separating calorimeter and throttling calorimeter respectively, then actual dryness fraction of steam is

  1. XI - X2
  2. XI + X2 /2
  3. X1 + X2
  4. X1 * X2

23. In a IC engine from which of the following source energy is converted into mechanical energy

  1. Chemical energy of fuel.
  2. potential energy
  3. kinetic energy
  4. All of the above

24. In a simple gear train having two gears, if driving gear rotates in clockwise direction then driven gear rotates in

  1. Clockwise direction
  2. Anti clockwise direction
  3. Depend on size of gear
  4. depend on no. of teeth

25. In a two stroke cycle engine, one cycle is completed in the following number of revolutions of the crank shaft

  1. 2
  2. 3
  3. 1
  4. 4

26. In diesel cycle, heat is added at

  1. constant temperature
  2. constant enthalpy
  3. constant volume
  4. constant pressure

27. In Following which is the power producing device?

  1. Pump
  2. I.C. Engine
  3. Compressor
  4. Air Conditioner

28. In multi stage compression as compared to single stage compression the volumetric efficiency is

  1. more
  2. less
  3. Constant
  4. None of the above

29. In S.I. unit for the force is.

  1. Kgm
  2. Kgf
  3. Newton
  4. Lb

30. In the Polytropic Process PVn= C, if n = infinity , the process is called

  1. isochoric
  2. isobaric
  3. isothermal
  4. adiabatic
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