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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 11
Q1 | Which of the boiler provides superheated steam?
- Locomotive boiler
- Lancashire boiler
- Cornish boiler
- All of the above
- None of the above
Q2 | Which of the following particles will be smallest in size?
- Drizzle
- Mist
- Smog
- Fog
- Rain
Q3 | Dew point temperature is an indication of
- Condition of air
- Condition of moisture in air
- Dryness of air
- Lowest temperature where air and water vapour start separating
- Moisture constant of air
Q4 | High air-fuel ratio in gas turbines
- Reduces the exhaust temperature
- Improves thermal efficiency
- Increases power output
- Restricts damage to turbine blades
- None of the above
Q5 | If a steam injector fails to lift the water the trouble may not be due to
- Too low steam pressure for list
- Water pipe clogged
- Water supply to cold
- End of water pipe not submerged
- None of the above
Q6 | Working in the cryogenic range means dealing with temperatures
- Below absolute zero
- Below zero degree centigrade
- Between - 190?C and absolute zero
- Prevailing normally in the atomsphere
- Between zero degree centigrade and 190?C
Q7 | The sulphur content in diesel oil should not exceed
- 15%
- 5%
- 12%
- 1%
- 10%
Q8 | Which of the following will not be seen in a boiler using pulverised fuel?
- Chain in great stoker
- Feed pump
- Economiser
- Superheater
- Chimney
Q9 | The governor for steam turbine is driven by
- Main shaft
- Separate motor
- Belt drive
- Feed pump motor
- None of the above
Q10 | Air preheater in a boiler will be invariably located between
- Condenser and feed water pump
- Water treatment plant and furnace
- Boiler furnace and chimney
- Economiser and feed pump
- Forced draft fan and furnace
Q11 | A run-of-river hydro-electric station is one which is
- Located on a small river
- Located on a river which does not flow throughout the year
- Located on a steam flow without water storage
- Locted on a steam flow with large water storage
- None of the above
Q12 | After cooler is used to
- Cool the air
- Reduce the volume of air
- To cause moisture and oil vapour to drop out
- Remove impurities from air
- None of the above
Q13 | Brayton cycle cannot be used in reciprocating engines even for same compression rations and work output because
- Large volume at low pressure cannot be efficiently harded in reciprocating engines
- Brayton cycle is less efficient
- Otto cycle is more efficient
- Brayton cycle requires large air-fuel ratio
- Brayton cycle is for slow speed engines only
Q14 | A sample having pH value of 5 will be
- Neutral
- Acidic
- Alkalino
- None of the above
Q15 | The mean effective pressure of a diesel cycle having fixed compression ratio will increase if cut off ratio will
- Increase
- Decrease
- Independent of CR
- Depends on other factors
- None of the above
Q16 | Thermal efficiency of C.I. engines on weak mixtures is
- Higher
- Lower
- Unaffected
- Depends on other factors
- None of the above
Q17 | In order to achieve maximum possible fuel economy the design features which will be affected are
- Volumetric efficiency
- Compression ratio
- Method of charging
- Atomization
- None of the above
Q18 | A negative loop in the P-V diagram of a petrol engine is due to
- Carbon dioxide
- Suction of air
- pre-ignition
- early opening of exnaust valve
- detonation
Q19 | A compound pressure gauge measures
- Average pressure
- Positive and negative pressures
- Compound pressures
- Variable pressures
- Complex pressures
Q20 | A barN is
- A unit of area
- A unit of length
- A unit of time
- A unit of mass
- None of the above
Q21 | In isothermal compression
- There is no gain internal energy
- Temperature increses very slowly
- There is no exchange of heat with environment
- Entropy changes is zero
- None of the above
Q22 | In Parsons reaction turbine
- The fixed and moving blades are identical
- The velocity biagram is unsymmetrical about a vertical centre line
- The degree of reaction is
- The fixed blades are smaller in size as compared to moving blades
- The fixed blades are larger in size compared to fixed blades
Q23 | For combustion of one kg of carbon the quantity of oxygen required (air contains 23% by wight of oxygen) is
- 12 kg
- 8 kg
- 2.62 kg
- 11.6 kg
- 3.67 kg
Q24 | If a engine working on Otto cycle has its compression ratio raised from 5 to 6 the percentage increase in air standard efficiency will be
- 4%
- 10%
- 6%
- 8%
- 1%
Q25 | For spark ignition engines fuel in order of decreasing knock tendency are
- Paraffins, aromatics, naphthenes
- Paraffins, naphthenes, armatics
- Aromatics, paraffins, naphthenes
- Naphthenes, aromatics, paraffins
- Naphthenes, paraffins