About Thermal Engineering

Following are some of the multiple choice questions on the Thermal Engineering with answers that will help the students in developing their knowledge.

Thermal Engineering MCQ

1. Which of the following is an extensive property?

  • Volume
  • Pressure
  • Viscosity
  • All of the above

2. Define refrigeration

  • It is the process of continuous cooling or extraction of heat to below that of the atmosphere from a substance with a help of the external work.
  • It is based on the second law of thermodynamics that the heat can made to flow from cold body to a hot body with the help of external source.
  • used to remove heat from the refrigerated space and reject it to atmosphere.
  • All of above

3. The flow through a nozzle is regarded as

  • constant volume flow
  • constant pressure flow
  • isothermal flow
  • isentropic flow

4. The motion of the cam is transferred to the valves through

  • Pistons
  • Rocker Arm
  • Cam shaft Pulley
  • Valve stems

5. How is absolute pressure measured?

  • Gauge pressure + Atmospheric pressure
  • Gauge pressure – Atmospheric pressure
  • Gauge pressure / Atmospheric pressure
  • None of the above

6. Which of the following energy conversion devices convert heat into work?

  • Electrical generators
  • I. C engines
  • Condensers
  • All of the above

7. Steam turbines may be classified according to

  • Direction of steam flow
  • Number of stages
  • Mode of steam action
  • All of these

8. Which of the following cycles uses ‘air’ as the refrigerant

  • Ericson
  • Bell Coleman
  • Stirling
  • Carnot

9. Recuperator as a waste heat recovery system is used mainly in a

  • boiler
  • reheating furnace
  • compressor
  • gas turbine

10. Odometer is an instrument used for measurement of

  • power
  • Fuel consumption
  • Engine speed
  • distance

11. What is full form of SI

  • Simple Ignition
  • Standard idling
  • Spark ignition
  • Solo identification

12. The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

  • V = 44.72 hdkh_d\sqrt{k}hd​k​
  • V = 44.72 khdk\sqrt{h_d}khd​​
  • V = 44.72 khd\sqrt{kh_d}khd​​
  • V = 44.72 khdkh_dkhd​

13. What is the pH value of water permissible for boiler?

  • 0
  • 5.5
  • 6
  • 8.5

14. What is a typical efficiency of a cogeneration system?

  • 58%
  • 85%
  • 68%
  • 95%

15. Which of the following statements is not correct

  • A topping cycle plant generates electricity or mechanical power first
  • A bottoming cycle plant generates heat first
  • Both a and b
  • A bottoming cycle plant generates electricity or mechanical power first

16. Objects with MORE MASS have______________

  • lower potential energy
  • lower number of atoms
  • higher thermal energy
  • higher temperature

17. A waste heat recovery steam generator is used with

  • steam turbines
  • back pressure turbines
  • gas turbines
  • condensing turbines

18. What is the function of air preheater?

  • To increase air temperature by flue gases
  • To increase water temperature by air
  • To increase steam temperature by air
  • To increase air temperature by steam

19. The heat recovery device in which high conductivity bricks are used for storing heat is

  • heat pipe
  • heat pump
  • thermo compressor
  • regenerator

20. Bottoming cycle cogeneration is characterized by

  • Heat first power later
  • Only Heat
  • Power First and Heat Later
  • Only Power

21. In an isolated system, ________ can be transferred between the system and its surrounding.

  • Only energy
  • Only mass
  • both energy and mass
  • neither energy nor mass

22. The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.

  • Agree
  • Disagree

23. What is done to increase the rate of heat transfer in the Velox boiler?

  • The boiler is heated up to very high range of temperature
  • Combustion gases are circulated through tubes with supersonic speed
  • High grade fuel is made use for the combustion
  • The size of the boiler is changed as it is flexible

24. Which of the following relations depict relation between Celsius and Fahrenheit scale?

  • (oC / 5) = (oF – 32) / 9
  • (oC / 9) = (oF – 32) / 5
  • (oC / 32) = (oF – 9) / 5
  • None of these

25. The heat balance sheet for the boiler shows the

  • complete account of heat supplied by 1 kg of dry fuel and the heat consumed
  • moisture present in the fuel
  • steam formed by combustion of hydrogen per kg of fuel
  • complete combustion of one kg of fuel

26. The compression, condensation and expansion of refrigerant in a vapour compression refrigeration system is

  • Isenthalpic, isentropic and isothermal
  • Isentropic, Isochoric and isothermal
  • Isothermal, Isentropic and Isochoric
  • Isentropic, Isobaric and Isenthalpic

27. Which of the following depends on physical properties of fluids as well as geometry of the heat exchanger?

  • Fouling coefficient
  • Overall heat transfer coefficient
  • LMTD (Log Mean Temperature Difference)
  • Effectiveness

28. Heat balance in a boiler furnace is improved by sending air to the furnace

  • At low temperature
  • At high temperature
  • Does not depends on temperature
  • depends on pressure

29. The performance of a boiler is NOT measured by the

  • amount of water evaporated per hour
  • steam produced in kg/h
  • steam produced in kg/kg of fuel burnt
  • complete combustion of one kg of fuel per hour

30. Dribbling a basketball is an example of

  • potential energy
  • stored energy
  • temperature
  • kinetic energy

31. At which pressure the properties of water and steam become identical

  • 1 bar
  • 273 bar
  • 221 bar
  • 100 bar

32. The device used for recovering waste heat from the textile drier exhaust

  • heat wheel
  • recuperator
  • economizer
  • regenerator

33. Which will have the HIGHEST thermal energy?

  • Hot cup of tea
  • Cold bathtub water
  • Huge lake
  • Warm bowl of soup

34. Objects with MORE MASS have MORE thermal energy because

  • there are more molecules with energy in bonds
  • there are less atoms
  • there is less kinetic energy in the system
  • there is no potential energy at all

35. Which will have the LOWEST thermal energy?

  • Large mug of hot coffee
  • Baby bottle with warm milk
  • Gatorade jug of cold Gatorade
  • Large frozen puddle

36. Everything has thermal energy

  • False
  • True

37. All matter is made up of atoms that are constantly moving

  • True
  • False

38. Which of the following is the correct definition of ‘Shaft Power’?

  • It is the power developed by the blades
  • It is the power developed at the rim
  • It is the power based on the total internal steam flow and adiabatic heat drop
  • It is the actual power transmitted by the turbine

39. Which of the following is the correct definition for ‘Adiabatic Power’?

  • It is the power developed at the rim
  • It is the actual power transmitted by the turbine
  • It is the power based on the total internal steam flow and adiabatic heat drop
  • It is the power developed by the blades

40. In the context of cogeneration turbine, the thermodynamic process taking place is

  • expansion
  • condensation
  • contraction
  • both (a) & (c)

41. For objects that have the SAME mass, which object will have a HIGHER thermal energy?

  • the object with the higher temperature
  • the object with the lower temperature
  • the objects will have the same temperature
  • the objects have no temperature

42. Temperature always measures the ___________ movement of molecules

  • median
  • mode
  • total
  • average

43. Potential energy is the _________

  • energy of movement
  • same as kinetic energy
  • stored energy inside of something
  • potato

44. Cold things often have a _________ kinetic energy because_______

  • lower; particles are moving around less
  • lower; particles are moving around more
  • higher; particles are moving around the same
  • higher; particles do not move

45. As temperature increases, molecules _____________

  • move slower
  • move the same
  • move faster
  • stop moving

46. Temperature is a way we ____________ energy

  • eat
  • measure
  • gain
  • lose

47. Law of Conservation of Mass says...

  • Energy is always created and destroyed
  • Energy is only in hot things
  • Energy can be destroyed easily
  • Energy cannot be created or destroyed

48. Energy is the ability to do __________

  • bonds
  • work
  • atoms
  • molecules

49. Thermal energy is the __________ _________ energy of moving particles

  • total potential
  • average potential
  • average kinetic
  • total kinetic

50. Temperature is the __________ _________ energy of moving particles

  • average potential
  • average kinetic
  • total potential
  • total kinetic

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