Heat Engines Set 13

Mechanical Engineering

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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 13

Q1 | Engines are supercharged
  • To increase engine durability
  • To increase specific power output
  • To increase air-fuel ratio
  • To improve heat transfer
  • To reduce combustion temperature
Answer: To increase specific power output
Q2 | Thermodynamic equilibrium is completely defined by the specifications of the
  • Internal energy
  • Enthalpy
  • Generalized displacements
  • All above together
  • None of the above
Answer: All above together
Q3 | Within the boiler the temperature of steam is highest in
  • Water drum
  • water tubes
  • Superheater outlet
  • Water walls
  • Superheater inlet
Answer: Superheater outlet
Q4 | A closed vessel contains air at 1.2 ata and 57?C. The pressure of air in the vessel if the contents of the vessel are cooled to 37?C would be
  • 1.2 ata
  • 1.127 ata
  • 2.327 ata
  • 0.563 ata
  • 0.073 ata
Answer: 1.127 ata
Q5 | Which one of the following acts as ignition accelerator for C.I. engines fuel
  • Acetone peroxide
  • Hydrogen peroxide
  • None of above
  • n heptane
  • Armatic compounds
Answer: Acetone peroxide
Q6 | Paraffins in petrol have the general formula
  • Cn Hn
  • Cn H2n + 2
  • Cn H2n - 4
  • Cn H2n
  • Cn H2n - 2
Answer: Cn H2n + 2
Q7 | If an air cooled compressor gets over-heated during operation, the probable cause cannot be
  • Direction of rotation wrong
  • Valve strips broken
  • Leadage in intercooler
  • Insufficient lubricating oil
  • Intake fliter clogged
Answer: Leadage in intercooler
Q8 | The phenomenon of hunting is associated with
  • Governors
  • Gears
  • Cloth mechanism
  • Carburetors
  • Tappet valves
Answer: Governors
Q9 | The term regeneration is closely associated with
  • Steam engines
  • Steam turbines
  • Diesel engines
  • Gas engines
  • Wankel engines
Answer: Steam turbines
Q10 | The air standard efficiency of a turbine cycle is 56.5%, which one of the following may be Carnot efficiency between the temperature limits of the cycle?
  • 75%
  • 64%
  • 50%
  • 100%
  • 56.50%
Answer: 64%
Q11 | A wankel engine is
  • Rotory engine
  • Turbine engine
  • Jet engine
  • Reciprocating engine
  • Hybrid engine
Answer: Rotory engine
Q12 | The temperatures and pressures for boiler are given below. Which of these boilers can be classified as super-critical pressure boiler?
  • 250 psi, 150?C
  • 100 kg/cm2, 450?C
  • 10 kg/cm2, 150?C
  • 150 kg/cm2, 500?C
  • 218 kg/cm2, 540?C
Answer: 218 kg/cm2, 540?C
Q13 | Motor cycle not using deflector type piston usually utilise
  • Reverse flow scavanging
  • Ideal scavanging
  • Uniflow scavanging
  • Natural scavanging
  • Loop scavanging
Answer: Reverse flow scavanging
Q14 | Direction of feed water is done because
  • It reduces weight of water to be handled
  • It reduced priming difficulties in feed pumps
  • It reduces corrosion caused by oxygen present in air
  • It reduces amount of heat required to convert water into steam
  • None of the above
Answer: It reduces corrosion caused by oxygen present in air
Q15 | The dryness fraction of steam within a turbine is usually not allowed to fali below
  • Unity
  • 0.45
  • 0.8
  • 0.9
  • 0.99
Answer: 0.9
Q16 | Which of the following is an accessory for a boiler?
  • Stop valve
  • Feed check valve
  • Safety valve
  • Feed pump
  • Blow off cock
Answer: Feed pump
Q17 | The molecules move in a solid
  • At random
  • Back and forth like tiny pendulum
  • In irregular motion
  • In circular motion
  • None of above
Answer: Back and forth like tiny pendulum
Q18 | In all a four stroke four cylinder engine will have how many valves?
  • 8
  • 16
  • none
  • 4
  • Carbon dioxide
Answer: 8
Q19 | Latent heat is
  • Heat required to change the state or condition under which the substance exists
  • Heat that does not follow first law of thermodynamics
  • Heat required to change the state of substance from liquid state to solid state
  • Heat required to change the substance from solid to gaseous state
  • Heat cannot be detected
Answer: Heat required to change the state or condition under which the substance exists
Q20 | Steam consumption per kWh of electricity generated in a modern power plant is of the order of
  • 10 -12 kgs
  • 5 - 7 kgs
  • 8 - 10 kgs
  • 2 - 4 kgs
  • 1 - 2 kgs
Answer: 5 - 7 kgs
Q21 | In jet engines the compression ratio
  • Varies with square of speed
  • Remains constant
  • Varies with altitude
  • Depends on other factors
  • Varies with altitude
Answer: Varies with square of speed
Q22 | An Orsat's apparatus is used for
  • None of above
  • Gravimetric analysis of the flue gases
  • Volumetric analysis of the flue gas
  • Smoke density analysis of the flue gases
  • All of above
Answer: Volumetric analysis of the flue gas
Q23 | Motoring test on I.C. engines is conducted to measure
  • I.H.P.
  • B.H.P.
  • Pumping horse power
  • Friction horse power
  • None of the above
Answer: Friction horse power
Q24 | The turbidity in boiler feed water causes
  • Sludge
  • Scale
  • Corrosion
  • Embrittlement
  • None of the above
Answer: Sludge
Q25 | Steam leaves the steam nozzle at
  • Low pressure and low velocity
  • Low pressure and high velocity
  • High pressure and low velocity
  • High pressure and high velocity
  • None of the above
Answer: Low pressure and high velocity
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