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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 14
Q1 | In diesel engines thermal efficiency may be expected in the range
- 35 to 40 percent
- 10 - 15 percent
- 15 to 25 percent
- 50 percent
- 25 to 30 percent
Q2 | In reciprocating air compressor, the method of controlling the quantity of air delivered is done by
- Clearance Control
- Throttle Control
- Blow-off Control
- All of the above
- Carbon dioxide
Q3 | Motor cycles generally have
- Evaporative cooling system
- Natural cooling engines
- Ice cooled engines
- Natural cooling engines
- Air cooled engines
Q4 | Crankcase dilution is
- Dilution of fuel in crank case
- Dilution of lubricating oil in crankcase
- Dilution of mixture while passing through crankcase in two stroke engines
- Addition of water in crankcase
- None of the above
Q5 | In an analysis report of a sample of coal the percentage of one of the constituents is specified as 3.5%. This constituent could be
- Carbon
- Ash
- Moisture
- Sulphur
- Any of the above
Q6 | A plant costing Rs. 80,000 has a useful life of 12 years. The amount that should be saved annually to replace the equipment at the end of useful life with salvage value of Rs. 8,000 should be
- Rs. 15000
- Rs. 8000
- Rs. 6000
- Rs. 5000
- Rs. 10000
Q7 | In a spark ignition engine supercharging
- Decreases knocking tendency
- There is no effect on knocking
- Increases knocking tendency
- Knocking is affected by other factors
- 1000 hours
Q8 | A passout turbine generally operates on low pressure in the range
- 10 - 20 kg/cm2
- 100 - 150 kg/cm2
- 20 - 50 kg/cm2
- 150 - 300 kg/cm2
- 50 - 100 kg/cm2
Q9 | In a reaction turbine while steam flows through the fixed blades
- Velocity increases
- Velocity decreases
- Velocity increases while pressure drops
- Pressure increases
- Neither admission pressure nor cut off is varied
Q10 | For steam engine having a throttle governor, a straight line is obtained when the total weight of steam used per hour is plotted against the indicated horse power. This line is known as
- Willian's line
- Clapeyron's line
- Bunsen line
- Calender's line
- Hopson's line
Q11 | Ignition accelerators are used primarily to
- Reduce exhaust temperature
- Convert carbon monoxide into carbon dioxide
- Reduce combustion knock
- Cool the engine cylinder
- All of the above
Q12 | A gas turbine power plant suits as
- Peak load plant
- Casual run plant
- Base load plant
- All of the above
- None of the above
Q13 | In diesel engines, the accumulation of carbon in the cylinder increases
- Mechanical efficiency
- Volumetric efficiency
- Ignition delay period
- Effective compression ratio
- Clearance volume
Q14 | Which of the following is the internal loss of a turbine?
- None of above
- Blade friction loss
- Nozzle loss
- All of above
- Wheel friction loss
Q15 | Which of the following is not a property of carbondioxide?
- Non-toxic
- Non-inflammable
- Colourless
- Pungent odour
- None of the above
Q16 | A heat exchanger that can remove fixed quantity of heat from a system is available where should it be installed for best economy
- Anywhere
- As intercooler
- After final stage compression
- Depends upon size of installation
- Prior to first stage compression
Q17 | A fan is being operated in an environment for which information is available. Now if the fan speed is doubled, how will the static pressure vary
- Eight times
- No change
- Sixteen times
- Doubled
- Four times
Q18 | A 50 cfm compressor can
- Compress 50 cu feet per min of free air
- Compress 50 cu feet per min of standard air
- Deliver 50 cu feet of compressed air at delivery pressure
- Delivers 50 cu ft. per minute of compressed air
- None of the above
Q19 | A perfect heat engine works on the Carnot cycle between 1000?C and 200?C. The efficiency of the engine will be
- 42.80%
- 60%
- 62.80%
- 80%
- 37.20%
Q20 | A gas turbine works on
- Dual cycle
- Brayton cycle
- Carnot cycle
- Otto cycle
- Rankine cycle
Q21 | In power station practice 'spinning reserve' is
- Reserve generating capacity that is in operation but in service
- Reserve generating capacity that is connected to bus and ready to take load
- Reserve generating capacity that is available for service but not in operation
- Capacity of the part of plant that remains under maintenance
- None of the above
Q22 | Ash content of a diesel fuel oil should not exceed
- 0.50%
- 0.05%
- 1%
- 0.01%
- 0.10%
Q23 | Injector is used to
- Inject wet steam into superheater
- Inject steam into steam engine cylinder
- Inject secondary air in boiler furnace
- Inject water boiler
- Inject exhaust gases into chimney
Q24 | A barn is a
- Unit of momentum
- Unit of time
- Unit of area
- Unit of length
- Unit of mass
Q25 | High steam and low water safety valve is not used on which of the following boiler?
- Locomotive boiler
- Cornish boiler
- Cochran boiler
- Lancashire boiler
- All of the above