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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 19
Q1 | Dehydration is the process of removal of
- hydrogen from water
- hydrogen from hydrocarbon
- moisture from anything that is wet
- hydrogen from alcohols
- addition of water vapour to a substance
Q2 | For minimum work in multistage compression, the work done on
- First stage should be least
- Last stage should be least
- All stage should be equal
- There is no such consideration
- None of the above
Q3 | For the same maximum pressure and heat input the least efficient cycle is
- Diesel cycle
- Otto cycle
- Weight of engine
- Brayton
Q4 | A Curtis turbine is
- A velocity compounded readtion turbine
- A pressure compounded reaction turbine
- A pure reaction turbine
- An impulse reaction turbine
- None of the above
Q5 | If the performance of diesel engines of different sizes, cylinder dimensions and horse power ratings are to be compared, which of the following parameter can be used for such comparison?
- Air-fuel ratio
- Brake specific fuel consumption
- Volumetric efficiency
- Swept volume
- None of the above
Q6 | For same heat input and same compression ratio
- Otto cycle and Diesel cycle are equally efficient
- Otto cycle is less efficient than Diesel cycle
- Otto cycle is more efficient than Diesel cycle
- Efficiency depends mainly on working substance
- None of the above
Q7 | The volumetric efficiency of a well adjusted engine at full load may be
- 40 to 55 percent
- 10 to 30 percent
- 75 to 95 percent
- 50 to 65 percent
- 30 to 45 percent
Q8 | In Ambassador car, the engine is
- Multi-cylinder type
- V-type
- Air cooled and reciprocating engines
- Horizontal
- Constant speed type
Q9 | Dehydration means
- Removing hydrogen from a mixture
- Removing hydrogen from a hydrocarbon
- Removing water from any matter
- Removing hydrides from any matter
- Any of the above
Q10 | Absolute pressure is
- Gauge pressure
- Gauge pressure + 1.03 kg/cm2
- Gauge pressure-atmospheric pressure
- Gauge pressure + atmospheric pressure
- None of the above
Q11 | Samples of exhaust gases from following engines have been collected
- Diesel engine
- Gas engine
- 600;1
- Petrol engine
- Jet propulsion unit
Q12 | Normally the colour of exhaust from a petrol engine is
- Reddish
- Black
- Yellowish
- Bluish
- Violet
Q13 | The boilers using lignite as fuel do not use
- Horizontal burner, pulverized fuel
- Travelling grate stoker
- U-flame pulverized fuel burner
- Speader stoker
- Underfeed stoker
Q14 | Cetane number of diesel generally used in India is in the range
- 55 to 65
- 40 to 55
- 20 to 25
- 15 to 20
- 10 to 15
Q15 | Scavenging efficiency of a four stroke diesel engine is
- In the range 80 to 95 percent
- In the range 50 - 80 percent
- Below 50 percent
- Between 100% and 95%
- None of the above
Q16 | The bottom ring on the piston is known as
- Oil ring
- Scrapper ring
- Compression ring
- Groove ring
- Any of the above
Q17 | In a compression ignition engine squish is
- Created at the beginning of suction stroke
- Created at the end of suction stroke
- Created during combustion
- Created towards the end of compression stroke
- None of the above
Q18 | Which locomotives has the highest unbalanced forces?
- Electric locomotives
- Steam locomotives
- Carbon dioxide
- Diesel locomotives
Q19 | For the same power and same speed, the flywheel of a two stroke engine as compared to that of a four stroke engine will be
- There is no correlation
- Same size
- Small
- Bigger
- Different shape
Q20 | The maximum amount of dissociation occurs in the burnt gases of a
- Carbon dioxide
- lean mixture
- chernically correct mixture
- rich fuel mixture
- weak fuel mixture
Q21 | In a Carnot cycle the algebraic sum of the entropy changes for the cycle is
- Zero
- Either positive or negative
- Negative
- Depends on the properties of working substance
- Positive
Q22 | Blue smoke from a diesel engine indicates the presence of
- Unburnt carbon
- Unburnt oil
- Carbon dioxide
- Carbon monoxide
- Nitrous oxide
Q23 | A turbo-charger is used
- In gas turbines for compression of air
- For supercharging reciprocating engine
- In jet propulsion units
- In rockets for producing air fuel mixture
- None of the above
Q24 | For same compression ratio and same heat input
- Otto cycle is more efficient
- Diesel cycle is more efficient
- Both are equally efficient
- None of the above
Q25 | Which is the external loss in a steam turbine?
- Blade friction losses
- Nozzle losses
- Disc friction losses
- Back pressure losses
- Gland leakage losses