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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 4
Q1 | Calorific value of methane gas can be determined by
- Bomb calorimeter
- Bunsen's apparatus
- Orsat's apparatus
- None of the above
- At constant temperature
Q2 | Which one of the following factors will not assist in improving thermal efficiency of a compression ignition engine?
- Fine atomisation and even distribution of fuel
- Minimum heat loss during combustion
- Clear exhaust
- High surface to volume ratio
- Any of the above
Q3 | A diesel power plant is best suited as
- Base load plant
- Stand by plant
- Peak load plant
- General purpose plant
- None of the above
Q4 | Excessive moisture in steam in a steam turbine is likely to result in
- Erosion of turbine blades
- Excess work done by rotor due to momentum of water particles
- Overheating of turbine blaces
- Reduced load on condenser
- Reduced size of steam turbine
Q5 | According to Boyle's law
- At constant pressure the temperature of a gas varies inversely as its volume
- At constant pressure the absolute temperature of a gas varies inversely as its volume
- At constant temperature, the pressure of a gas varies inversely as its volume
- At constant temperature, the absolute pressure of a gas varies inversely as its volume
- None of the above
Q6 | An optical pyrometer works on the principle of
- Expansion of fluids
- Mono-chromatic radiation
- Thermo-electric effect
- Total radiation
- Change of electrical resistance
Q7 | Air fuel ratio for a jet engine is of the order of
- 15 ; 1
- 20 ; 1
- 400 ; 1
- 60 ; 1
- 10 ; 1
Q8 | The top ring nearest to the piston crown is known as
- Oil ring
- Scrapper ring
- Compression ring
- Groove ring
- Any of the above
Q9 | The vapour pressure is related to the enthalpy of vaporization in
- Maxwell's equation
- Henry's law
- Dalton's law
- Clausius Clapeyron equation
- Raoult's law
Q10 | Flash point of a liquids is the temperature at which
- The fuel ignites with clearly visible flash
- Fuel vaporises at the prescribed rate
- The fuel emits vapours at a rate which produces an inflammable mixture with air
- The fuel ignites without a park
- The fuel spontaneously ignites
Q11 | According to kinetic theory of heat
- At absolute zero there is absolutely no vibration of molecules
- At low temperatures all bodies are in solid state
- 25 to 30
- Temperature should rise during boiling
- Temperature should fall during freezing
Q12 | Regenerative feed heating of steam turbines is done primarily to
- Improve thermal efficiency of the condenser
- Increase the expansion range for steam in the turbine
- Improve overall efficiency of the plant
- Reduce pressure of steam in exhaust
- Reduce boiler losses in the gases
Q13 | Ricardo's theory is associated with
- Steam turbines
- Wankel engines
- Internal combustion engines
- Closed cycle gas turbines
- Engine vibrations
Q14 | A 'blue' flame is
- Non-radiant flame
- Radiant flame
- Super high temperature flame
- Ordinary flame in oil burners
- None of the above
Q15 | The thermal efficiency of a dual cycle engine with fixed compression ratio and fixed quantity of het and with increase in pressure ratio, will
- Increase
- Decrease
- Not change
- Depends on another factors
- None of the above
Q16 | Turbidity in boiler feed water causes
- Sludge
- Embrittlement
- Corrosion
- Scale
- None of the above
Q17 | A mixture containing 60% cetane and 40% Iso-octane will have
- Cetane number 60
- Cetane number 40
- Octane number 60
- Octane number 40
- None of the above
Q18 | A vacuum of 712 mm was obtained with the barometer reading 753 mm of mercury. The corrected vacuum to a standard barometer of 760 would be
- 719 mm Hg
- 753 mm Hg
- 706 mm Hg
- 760 mm Hg
- 712 mm Hg
Q19 | Flash point for diesel fuel oil should be
- Minimum 49?C
- Maximum 49?C
- Maximum 100?C
- Maximum 200?C
- None of the above
Q20 | The knocking tendency in a compression ignition engine for a given fuel will
- Enhance by reducing compression ratio
- Enhance by increasing compression ratio
- Depend on other factors
- Increase to certain limits and then no change
- None of the above
Q21 | A steam turbine in which a part of the steam turbine after partial expansion is used for process heating and the remaining steam is further expanded for power generation, is known as
- Impulse turbine
- Regenerative turbine
- Back pressure turbine
- Pass out turbine
- 50% reaction turbine
Q22 | A De-Laval turbine is
- Multiple stage reaction turbine
- Single rotor impulse turbine
- Multiple rotor reaction turbine
- Velocity compounded impulse turbine
- Single rotor reaction turbine
Q23 | In a cut off covered steam engine
- Admission pressore remains constant while cut off is varied
- Admission pressure is reduced while cut off remains unaltered
- Admission pressure and cut off both are varied
- Neither admission pressure nor cut off is varied
- Admission pressure is increased while cut off remains unaltered
Q24 | Which one of the following is a safety device on a compressor?
- Intercooler relief valve
- Over pressure shut down
- Strainer
- Over speed shut down
- Relief valve
Q25 | Naphtha is used as
- Lubricant for turbines
- Lubricant for slow speed engines
- Fuel for marine engines
- Fuel for furnaces
- Fuel for aero engines