Heat Engines Set 8

Mechanical Engineering

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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 8

Q1 | Stuffing box is provided in
  • Condensing steam engines
  • Non-condensing steam engines
  • High speed steam engines
  • Single acting steam engines
  • Double acting steam engines
Answer: Double acting steam engines
Q2 | An exciter is a
  • D.C. motor
  • D.C.generator
  • A.C.generator
  • Synchronous motor
  • None of the above
Answer: D.C.generator
Q3 | An engine operates at 1440 rpm under load whereas no load speed is 1500 rpm. The percentage speed drop of governor will be
  • 2%
  • 3%
  • 4%
  • 10%
  • 6%
Answer: 4%
Q4 | In a Bomb calorimeter the fuel to be tested is burnt
  • At constant volume
  • At constant pressure
  • There is no consideration of volume or pressure
  • In open atmosphere
  • At constant temperature
Answer: At constant volume
Q5 | Which fuel will have least air consumption during combustion
  • Spirit
  • Benzol
  • Diesel fuel oil
  • Gasoline
  • Lubricating oil
Answer: Spirit
Q6 | Movement of air inside engine cylinder does not help in
  • Distribution of fuel
  • Mixing of fuel with air
  • Reduction of after burning
  • Reducing noise
  • None of the above
Answer: Reducing noise
Q7 | In a Lancashire boiler, the economiser is located
  • Before air preheater
  • After air preheater
  • Between feed pump and boiler
  • At any of the above locations
  • None of the above locations
Answer: Before air preheater
Q8 | Iso-octane has octane number of
  • 100
  • 0
  • 50
  • 80 to 85
  • More than 100
Answer: 100
Q9 | Freezing point of petrol is around
  • ?4?C
  • ?30?C
  • 10?C
  • ?13?C
  • 0?C
Answer: ?30?C
Q10 | 1 Torr is equivalent to
  • 1 mm Hg
  • 13.6 cm of water column
  • 760 mm of water
  • 760 mm of Hg
  • None of the above
Answer: 1 mm Hg
Q11 | The most effective air cleaner for diesel engines is
  • Whirl type
  • Oil bath type
  • Dry type
  • Rope type
  • Wet type
Answer: Oil bath type
Q12 | An economiser is installed in a boiler plant primarily to
  • Increase steam pressure
  • Increase rate of steam evaporation
  • Superheat the steam
  • Purify boiler feed water
  • Reduce fuel consumption
Answer: Reduce fuel consumption
Q13 | The equilibrium conditions between supersaurated vapour and a cooled liquid surface are expressed in
  • Dalton's equation
  • Napier's equation
  • Kelvin Helmhotz equation
  • Clapcyron's equation
  • Calender's equation
Answer: Kelvin Helmhotz equation
Q14 | Most of the heat generated in I.C. engines is transferred to surrounding medium by
  • Conduction only
  • Convection only
  • Conduction and convection
  • Radiation only
  • None of the above
Answer: Conduction and convection
Q15 | Vapour lock is
  • Supply of liquid fuel particles to engine in maixture
  • Excess fuel supply to engine due to faster evaporation
  • Complete or partial stoppage of fuel supply due to vaporisation of fuel in supply steam
  • Lock of vaporization of fuel to atomspheric pressure
  • Locking carburettor jets due to vapour pressure
Answer: Complete or partial stoppage of fuel supply due to vaporisation of fuel in supply steam
Q16 | The steam pressure in a pass out turbine may be expected to be in the range
  • 10 kg/cm2 to 20 kg/cm2
  • 100 kg/cm2 to 150 kg/cm2
  • 150 kg/cm2 to 300 kg/cm2
  • 75 kg/cm2 to 100 kg/cm2
  • 40 kg/cm2 to 75 kg/cm2
Answer: 10 kg/cm2 to 20 kg/cm2
Q17 | A regenerator in a gas turbine
  • Reduces heat loss in exhaust
  • permits use of higher compression ratio
  • Improves thermal efficiency
  • Permits use of fuels of inferior quality
  • None of the above
Answer: Improves thermal efficiency
Q18 | Higher proportion of residual gases in the cylinder would mean
  • Higher volumetric efficiency
  • Lower volumetric efficiency
  • No change in volumetric efficiency
  • Depends on other factors
  • None of the above
Answer: Lower volumetric efficiency
Q19 | Low grade fuels have
  • Low moisture content
  • Low ash content
  • Low calorific valve
  • Low carbon content
  • None of the above
Answer: Low calorific valve
Q20 | A gas turbine cycle with regenerator has a thermal efficiency of 26%. If intercooler and reheater are also introduced what could be expected thermal efficiency
  • 50%
  • 10%
  • 60%
  • 40%
  • 30%
Answer: 30%
Q21 | Free piston engines find application in
  • Compressed air supply
  • Mining installations
  • Gas turbines
  • Supercharging of diesel engines
  • None of the above
Answer: Gas turbines
Q22 | In case of supersonic flow through the nozzle, when the cross-section increases in the direction of flow
  • The velocity will decrease in the direction of flow
  • The pressure will increase in the direction of flow
  • The velocity will increase while the pressure will decrease in the direction of flow
  • The velocity will decrease while the pressure will increase in the direction of flow
  • None of the above
Answer: The velocity will increase while the pressure will decrease in the direction of flow
Q23 | The performance of air compressor at high altitudes as compared to that at sea level will be
  • Will depend upon temperature of air
  • Will depend on type of compressor
  • Better
  • Same
  • Inferior
Answer: Inferior
Q24 | To avoid moisture trubles, the branch connection from compressed air line are taken from
  • Top side
  • Bottom side
  • Left side
  • Any side
  • Right side
Answer: Top side
Q25 | Which turbine has identical fixed and moving blades
  • Carbon dioxide
  • De Laval turbine
  • Parson's reaction turbine
  • Rateau's turbine
  • Hero's turbine
Answer: Parson's reaction turbine
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