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RGPV Unit – 5 Basic Mechanical Engineering MCQs
Q1. A steam engine works on
1. Otto cycle
2. Carnot Cycle
3. Modified Rankine cycle
4. None of the above
Answer:- 3) Modified Rankine cycle
Q2. The change in internal energy in steam engines equals to
1. work done during the Rankine cycle
2. work done during compression
3. work done during adiabatic expression
4. change in enthalpy
Answer:- 3) work done during adiabatic expression
Q3. The function of a governor on a steam engine is to
1. regulate load
2. match steam parameters with reference to load
3. provide safety of engine under abnormal conditions
4. maintain a fairly constant speed for all loads
Answer:- 4) maintain a fairly constant speed for all loads
Q4. Compound engines are used for
1. automobile industry
2. marine service
3. various power plant
4. none of the above
Answer:- 2) marine service
Q5. Steam engines are generally____acting.
1. double
2. single
3. double acting single cylinder
4. all of the above
Answer:- 1) double
Q6. The clearance in the engine cylinder
1. increases the mean effective pressure
2. increases the work done
3. decreases the efficiency of the engine
4. all of the above
Answer:- 4) all of the above
Q7. Which of the following boiler is best suited to meet the fluctuating demand for steam?
1. Locomotive boiler
2. Lancashire boiler
3. Cornish boiler
4. Babcock and Wilcox boiler
Answer:- 1) Locomotive boiler
Q8. Steam engine operates on
1. carnot cycle
2. joule cycle
3. stirling cycle
4. brayton cycle
Answer:- 4) Brayton cycle
Q9. Blading efficiency is also known as
1. stage efficiency
2. diagram efficiency
3. nozzle efficiency
4. none of these
Answer:- 2) diagram efficiency
Q10. Which among the following can be assessed based on the indicator diagram?
1. Overall performance of engine
2. Area of the reservoir
3. Load the engine can take
4. Speed of the Engine
Answer:- 1) Overall performance of engine
Q11. Which among the following is not a type of indicator diagram?
1. Power card
2. Draw card
3. Compression diagram
4. Powerhouse
Answer:- 4) Powerhouse
Q12. Deficiency type 4 is caused due to
1. Resistance to flow of air
2. Leaking exhaust valve
3. Low scavenging pressure
4. Overload of engine
Answer:- 4) Overload of engine
Q13. In a theoretical or hypothetical indicator diagram, the expansion is assumed to be
1. parabolic
2. linear
3. exponential
4. hyperbolic
Answer:- 4) hyperbolic
Q14. For a two-stroke engine, work done in one minute is given by
1. PmALN
2. PmALN/2
3. 2PmALN
4. None of these
Answer:- 1) PmALN
Q15. The latent heat of steam at atmospheric pressure is
1. 1535 kJ/kg
2. 1875 kJ/kg
3. 2257 kJ/kg
4. 2685 kJ/kg
Answer:- 3) 2257 kJ/kg
Q16. An ideal gas as compared to a real gas at very high pressure occupies
1. more volume
2. less volume
3. same volume
4. none of the above
Answer:- 1) more volume
Q17. In a Carnot cycle, the working medium receives heat at a _____ temperature.
1. lower
2. higher
3. constant
4. none of the mentioned
Answer:- 2) higher
Q18. In a Carnot cycle, the working medium rejects heat at a ____ temperature.
1. lower
2. higher
3. constant
4. none of the mentioned
Answer:- 1) lower
Q19. The adiabatic process of a Carnot cycle needs very _____ motion to complete the adiabatic process.
1. slow
2. fast
3. medium
4. none of the mentioned
Answer:- 2) fast
Q20. The Otto cycle is the
1. air standard cycle of CI engine
2. air standard cycle of SI engine
3. vapour power cycle of CI engine
4. vapour power cycle of SI engine
Answer:- 2) air standard cycle of SI engine
Q21. The spark plug fires shortly before the _____ stroke.
1. compression
2. expansion
3. intake
4. exhaust
Answer:- 2) expansion
Q22. Diesel cycle is also known as
1. constant volume cycle
2. constant pressure cycle
3. constant temperature cycle
4. none of the mentioned
Answer:- 2) constant pressure cycle
Q23. A diesel engine has a compression ratio from
1. 6 to 10
2. 10 to 15
3. 16 to 20
4. 25 to 40
Answer:- 3) 16 to 20
Q24. The pressure at the end of compression, in diesel engines, is approximately
1. 10 bar
2. 20 bar
3. 25 bar
4. 35 bar
Answer:- 4) 35 bar
Q26. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called
1. net efficiency
2. efficiency ratio
3. relative efficiency
4. overall efficiency
Answer:- 3) relative efficiency
Q27. If the intake air temperature of IC engine increases its efficiency will
1. increase
2. decrease
3. remain same
4. none of the mentioned
Answer:- 2) decrease
Q28. Piston rings are usually made of
1. cast iron
2. aluminium
3. carbon steel
4. babbitt
Answer:- 1) cast iron
Q29. The top piston rings nearer to the piston crown is known as
1. Compression ring
2. Oil ring
3. Groove ring
4. Leading ring
Answer:- 1) Compression ring
Q30. In an automobile engine, the temperature of the piston will be more at
1. the crown of the piston
2. the skirt of the piston
3. the piston walls
4. the piston rings
Answer:- 1) the crown of the piston
Q31. What is the degree of crank rotation during the completion of a four-stroke cycle?
1. 90°
2. 279°
3. 180°
4. 360°
Answer:- 3) 180°
Q32. What is the efficiency of compressed charge engine?
1. 40%
2. 20%
3. 30%
4. 10%
Answer:- 3) 30%
Q33. What percent of the supplied energy is converted into mechanical work by an IC engine?
1. 10%-20%
2. 30%-40%
3. 50%-60%
4. 70%-80%
Answer:- 2) 30%-40%
Q34. Theoretically, a four-stroke engine should develop ______ power as that of a two-stroke cycle engine.
1. half
2. same
3. double
4. four times
Answer:- 1) half
Q35. In a four-stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is ______ the atmospheric pressure.
1. equal to
2. below
3. above
4. none of the mentioned
Answer:- 2) below
Q35. Thermal efficiency of a two-stroke cycle engine is ____ a four-stroke cycle engine.
1. equal to
2. less than
3. greater than
4. none of these
Answer:- 2) less than
Q36. The choke used in the engine?
1. when the vehicle is idling
2. when the vehicle is accelerating
3. when the engine is cold
4. when the engine is hot
Answer:- 3) when the engine is cold
Q37. Where is the lean air-fuel mixture needed?
1. During starting
2. During idling
3. During acceleration
4. During cruising
Answer:- 4) During cruising
Q38. Diesel cycle is also known as
1. constant volume cycle
2. constant pressure cycle
3. constant temperature cycle
4. none of the mentioned
Answer:- 2) constant pressure cycle
Q39. A heat engine converts heat energy into_____ energy.
1. mechanical
2. electrical
3. heat
4. thermal
Answer:- 1) mechanical
Q40. Steam engine was invented in the year.
1. 1812
2. 1712
3. 1715
4. 1820
Answer:- 2) 1712
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Q41. The flow of steam into and out of the cylinder is controlled by
1. valve gear mechanism
2. compression
3. stroke engine
4. fuel pump
Answer:- 1) valve gear mechanism
Q42. Carnot cycle is made up of______thermodynamics process.
1. 2
2. 4
3. 5
4. 1
Answer:- 2) 4
Q43. Otto cycle is also known as
1. Constant volume cycle
2. Constant pressure cycle
3. Constant temperature cycle
4. None of the above
Answer:- 1) Constant volume cycle
Q44. The most important heat engine at the beginning of the industrial revolution was
1. Steam engine
2. IC engine
3. EC engine
4. Both 2 & 3
Answer:- 1) Steam engine
Q45. The connecting rod and crank convert motion.
1. Reciprocating
2. Horizontal
3. Stationary
4. Rotatory
Answer:- 1) Reciprocating
Q46. In a steam engine, the steam first enters into the
1. eccentric rod
2. steam chest
3. cylinder
4. crankshaft
Answer:- 2) steam chest
Q47. D-slide valves are used in _______ engines.
1. steam engine
2. IC engine
3. EC engine
4. Both 2 & 3
Answer:-1) steam engine
Q48. The motion of D-slide valves is controlled by _____ mounted on the
crankshaft.
1. valve
2. rotary
3. chuck
4. eccentric
Answer:- 4) eccentric
Q49. The area of indicator diagram represents _____ obtained in one cycle.
1. mechanical work
2. chemical work
3. electrical work
4. None of these
Answer:- 1) mechanical work
Q50. In a double-acting steam engine, there are _____ each cycle.
1. 3
2. 4
3. 2
4. 1
Answer:- 3) 2
Q51. Engines used in ships are known as engines.
1. Locomotive
2. Marine
3. Stationery
4. Suction
Answer:- 2) Marine
Q52. The maximum theoretical efficiency of a cycle cannot be more than that of _____ cycle.
1. Carnot
2. Diesel
3. Otto
4. Both 2 & 3
Answer:- 1) Carnot
Q53. The efficiency of Carnot cycle depends only on
1. minimum temperature
2. maximum temperature
3. minimum temperature and maximum temperature
4. constant temperature
Answer:- 3) minimum temperature and maximum temperature
Q54. The temperatures in the expression for Carnot efficiency are measured on _____.
1. Absolute scale
2. Indicator diagram
3. D slide
4. All of these
Answer:- 1) Absolute scale
Q55. The Otto cycle is used by engines running on
1. CNG
2. LPG
3. Both
4. None of these
Answer:- 2) LPG
Q56. For the same compression ratio, the air standard efficiency of Otto Cycle is _____ than that of Diesel Cycle.
1. more
2. less
3. less than equal to
4. more than equal to
Answer:- 2) less
Q57. The efficiency of diesel cycle _____ with an increase in cutoff ratio.
1. increase
2. decrease
3. equal
4. all of these
Answer:- 2) decrease
Q58. Two blanks of cylinder are found in _____ engine.
1. Steam engine
2. IC engine
3. EC engine
4. V engine
Answer:- 4) V engine
Q59. The regulation of the flow of charge air in two-stroke engines is done through
1. ports
2. valve
3. piston
4. chuck
Answer:- 1) ports
Q60. The regulation of flow of charge air in four-stroke engines is done through
1. ports
2. valve
3. piston
4. chuck
Answer:- 1) valve
Q61. IC engine does not have a piston rod but _____ has it.
1. Steam engine
2. V engine
3. EC engine
4. none of these
Answer:- 1) Steam engine
Q62. There are _____ number of cams in a typical four-stroke engine.
1. 3
2. 4
3. 2
4. 1
Answer:- 3) 2
Q63. There are _____ number of crankshafts in a 6 cylinder engine.
1. 3
2. 4
3. 2
4. 1
Answer:- 4) 1
Q64. A four-cylinder four-stroke engine must have minimum _____ number of waves.
1. 8
2. 6
3. 4
4. 2
Answer:- 1) 8
Q65. A _____ engine does not have a separate suction stroke.
1. Two-stroke
2. Four-stroke
3. Steam engine
4. IC engine
Answer:- 1) Two-stroke
Q66. A fuel injector nozzle is found in
1. Diesel engine
2. Otto engine
3. Carnot engine
4. Steam engine
Answer:- 1) Diesel engine
Q67. Larger IC engine is _____ cooled.
1. water
2. air
3. both 1 & 2
4. none of these
Answer:- 1) water
Q68. In a small two-wheeler automobile, the engine is _____ cooled.
1. water
2. air
3. both 1& 2
4. none of these
Answer:- 2) air
Q69. The efficiency of a two-stroke engine is _____ than that of four stock engine.
1. more
2. less
3. less than equal to
4. more than equal to
Answer:- 2) less
Q70. In a diesel engine, a _____ is used to supply of fuel to the injector nozzle at high pressure.
1. flywheel
2. crankshaft
3. stroke
4. fuel pump
Answer:- 4) fuel pump
Q71. IC engine is
1. Costly
2. Cheaper
3. Sustainable
4. All of these
Answer:- 1) Costly
Q72. Otto cycle depends on the only on_____ratio.
1. compression
2. expansion
3. both
4. none of these
Answer:- 1) compression
Q73. Otto cycle use in
1. Petrol engine
2. Diesel engine
3. Both 1 & 2
4. None of these
Answer:- 1) Petrol engine
Q74. Expansion stroke is also called
1. Scavenging
2. Power stroke
3. TDC
4. BDC
Answer:- 2) Power stroke
Q75. Total work done equal
1. heat input – heat output
2. heat input + heat input
3. heat input + heat output
4. heat output – heat input
Answer:- 1) heat input – heat output
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