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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 7
Q1 | The air standard efficiency of a Diesel engine depends on
- Speed
- Torque
- Thermodynamic properties of working fluid
- Cetane value of fuel used
- Compression ratio
Q2 | The size of a steam engine is 200 x 250 - 300 r.p.m. In this 200 indicates
- Shaft diameter
- Steam pressure in 1bs/sq. in.
- Piston stroke
- Horse power
- Cylinder bore
Q3 | In multistages turbines by introducting reheating
- Thermal efficiency improves
- The output of turbine increases
- Work done by compressor reduces
- The ratio compressor compressor work/turbine output decreases
- None of the above
Q4 | In order to reduce wear and eliminate scuffing, piston ring in internal combustion engines are
- Made of soft material
- Provided with grooves
- Lubricated thoroughly
- Made of square section
- Plated with chromium, cadmium or phosphate
Q5 | The ends of piston rod in steam engines are connected to
- Connecting rod and cross-head
- Crankshaft and cross-head
- Piston and crankshaft
- Piston and cross-head
- Connecting rod and crankshaft
Q6 | One horse power-hr is equal to
- 1 kWh
- 632 kcal
- 100,000 kJ
- 107 Joules
- None of the above
Q7 | Which of the following boiler uses exhaust of the engine to produce draught?
- Lamont boiler
- Cornish boiler
- Babcock and wilcox boiler
- Lancashire boiler
- Locomotive boiler
Q8 | In jet engine the compression ratio
- Varies with altitude
- Varies with speed
- Varies as square of speed
- Remains constant
- None of the above
Q9 | Pour point is the temperature at which oil
- Starts cracking
- Will start flowing
- Barely flows
- Will ignite
- Will give off vapours enough for ignition
Q10 | Which one of the following factors will not assist in smooth running of a compression ignition engine?
- Moderate rate of pressure rise
- Short delay period
- Minimum of after burning
- High ignition temperature of fuel
- None of the above
Q11 | In case of an opposed piston engine the combustion chamber
- Is not provided
- Is formed between two piston tops
- Is provided towards crank case side
- Is fitted outside the cylinder
- None of the above
Q12 | Specific heat is
- The amount of heat required to raise the temperature of a unit quantity of substance through 1?C
- The amount of heat requred to change the state or condition under which a substance exists without changing its temperature
- The ratio of quantity of heat required to raise the temperature of a given weight of any substance through 1?C to the quantity of heat required to raise the temperature of same weight of water through 1?C
- The heat sensed by a mercury thermometer
- None of the above
Q13 | In a diesel engine the injection pressure is of the order of
- 1500 kg/cm2
- 100 kg/cm2
- 1000 kg/cm2
- 40 kg/cm2
- 500 kg/cm2
Q14 | If a water cooled compressor knocks during operation, the probable cause cannot be
- Loose valve
- Air filter choked
- Too much clearance in crank pin
- Excess cooling in intercooler
- Loose flywheel or pulley
Q15 | Thermal efficiency of a compression ignition engine may be of the order of
- 35%
- 50%
- 20%
- 75%
- 70%
Q16 | In centrifugal pumps suction head is
- Vertical distance from supply level to pump centre line pump being level
- (A) Above less suction friction heat
- (A) Above less velocity heat
- Any of the above
- None of the above
Q17 | Maintenance requirements are least in case of
- Electric locomotives
- Carbon dioxide
- Diesel locomotives
- Steam locomotives
Q18 | The higher the temperature required to ignite diesel fuel,
- Lower the octane number
- Carbon dioxide
- Lower the cetane number
- Higher the cetane number
- the higher the octane number
Q19 | In pumped storage systems, water is pumped
- Upstream during peak load periods
- Upstream during off peak periods
- Upstream during off season
- None of the above
- None of the above
Q20 | The supercharging of diesel engine is done mainly to
- Cool the engine
- Increase the life of the engine
- Increase the power output
- Increase the speed
- Reduce the cnoise from the engine
Q21 | In Eicher tractor the engine is
- Air cooled
- Horizontal
- Multi-cylinder type
- Low compression ratio petrol engine
- Constant speed engine
Q22 | Air fuel ratio in a petrol engine fitted with dirty air cleaner as compared to that with clean air clearance will be
- Not affected
- Higher
- Lower
- Fluctuating
- Depends on load
Q23 | Crankshafts are generally
- Turned from bar stock
- Die cast
- Sand cast
- Forged
- Cold headed
Q24 | In a condensing steam engine
- Exhaust steam is condensed in condenser
- Exhaust steam is not recirculated
- Steam condenses as soon as it leaves the cylinder
- Condensed steam is supplied
- Steam condenses inside cylinder
Q25 | The Apparatus used for the determination of calorific value of solid fuel is
- Bunsen's apparatus
- Photo calorimeter
- Bomb calorimeter
- Releigh apparatus
- Osrat's apparatus