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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 3
Q1 | A petrol engine as compared to diesel engine (both running at full load) is
- More efficient
- Less efficient
- Equally efficient
- Depend on other factors
- None of the above
Q2 | Which one of the following assumptions is not involved while deriving relation for air standard efficiency of Otto cycle?
- The engine operates at mederate rpm
- There is always thermal and chemical equilibrium
- Expansion and compression are adiabatic
- There is no chemical reaction inside the engine clinder
- The working fluid is air for which the specific heats are constant
Q3 | Which of the following needs constant cleaning in a diesel engine?
- Air only
- Fuel only
- Air, fuel and lubricating oil
- Lubricating oil only
- Air and fuel only
Q4 | Bagasse is
- Fibrous portion of sugarcane left after extracting the juice
- A variety of coal
- A fuel consisting of wood etc
- Same as biogas
- A kind of rice straw
Q5 | During regenerative feed heating
- Part of the steam is generated in turbine
- Condenser is supplied with dry and staturated steam
- Part of the steam is bled from turbine for feed water heating
- High pressure steam is used to heat low pressure steam coming out of the turbine after expansion
- None of the above
Q6 | A jet engine has
- Propeller in front
- Propeller in back
- No propeller
- Propeller on the top
- None of the above
Q7 | Anti-knock for compression ignition engines is
- Amyl nitrate
- Aromatics
- Hexadecane
- Tetra ethyl lead
- Trimethyl pentane
Q8 | Which statement is incorrect?
- LH.P of engines can be determined by more test
- Morse test can be conducted only on multicylinder engines
- Morse test can be conducted on petrol engines
- Morse test can be conducted on CFR engine.
- Morse test can also be conducted on diesel engines
Q9 | Advantage of a diesel engine over petrol engine is
- Low fuel consumption at full load as well as part load
- Smooth operation at all speeds
- Low compression ratio
- No detonation problems
- All of the above
Q10 | Forced circulation of water does not take place in which of the following boiler?
- Benson boiler
- La Mont boiler
- Babcock and Wilcox boiler
- Lancashire boiler
- Velox boiler
Q11 | In multistage compression, perfect intercooling means
- Temperature of air at inlet to subsequent stages is equal to initial temperature
- Temperature of air at inlet to subsequent stages is less than initial temperature
- Temperature of air at inlet to subsequent stages should be zero
- Temperature of inlet to subsequent stages should be equal to the final temperature
- None of the above
Q12 | The battery used in vespa scooter is
- No battery is used in the scooters
- Dry-cell type
- Lead acid type
- Nickel-iron type
- Nickel cadmium type
Q13 | Which variety of coal has low calorific value?
- Steam coal
- Bituminous coal
- Lignite
- Anthracite
- None of the above
Q14 | Stoichiometric ratio is
- Chemically correct air-fuel ratio by volume
- Chemically correct air-fuel ratio by weight
- Theoretical mixture of air for complete combustion
- Actual ratio of air to fuel for maximum efficiency
- None of the above
Q15 | Hot spots are
- Defects in S.I.engines
- Hottest point within engine cylinder
- Do not exist in engines
- The spots where heavier fractions of fuel are vaporised
- The hottest spots in engines
Q16 | Air required for complete combustion of 1 kg of carbon is 11.6 kg. If a fuel contains 88.6% Carbon and 11.4% Hydrogen, the air requirement will
- Will decrease
- 12 kg
- Will increase
- Remain unaltered
Q17 | Volumetric efficiency of a well designed engine may be in the range
- 40 to 50 percent
- 50 to 75 percent
- 75 to 90 percent
- Below 40 percent
- Below 20 percent
Q18 | If the boiler chimney emission consists of dense white smoke, then it can be concluded that
- Coal contains high percentage of sulphur
- Insufficient air has been supplied for combustion
- Chemically correct air has been supplied for combustion
- Excess air has been supplied for combustion
- Coal contains high percentage of ash
Q19 | Compression ratio in case of gas engines waries in the range
- 10 to 15
- 5 to 10
- 24 to 30
- 20 to 24
- 15 to 20
Q20 | A back pressure generally operates on pressures in the range
- 150 - 200 kg/cm2
- 15 - 40 kg/cm2
- 100 - 150 kg/cm2
- 50 - 100 kg/cm2
- 200 - 350 kg/cm2
Q21 | In automobiles as the speed of vehicle increases the back pressure
- Increases
- Reduces
- Remains unaffected
- Depends on other factors
- None of the above
Q22 | A mechanical indicator is used to determine
- Pumping horse power
- Indicated horse power
- IHP - BHP
- Friction horse power
- Brake horse power
Q23 | During adiabatic compression
- No heat leaves or enters the system
- Maximum work is done
- Specific heat remains constant
- Temperature remains constant
- None of the above
Q24 | Safety valve generally used on high pressure boiler is
- Dead weight type
- Lever type
- Combination lever and spring type
- Spring type
- None of the above
Q25 | Which of the following engine indicator has least inertia effects?
- Mechanical indicator
- Farnborough indicator
- CRO engine indicator
- All of the above
- Carbon dioxide