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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 10
Q1 | The amount of exhaust gases in clearance space left after exhaust stroke, varies with
- Clearance volume
- Carbon dioxide
- air-fuel ratio of charger
- Speed and load of the engine
- Bore and length of cylinder
Q2 | Out of the following diesel engine the minimum air consumption per B.H.P. will be in
- 50%
- 4 stroke, air injection
- 2 stroke, air injection
- 2 stroke, mech, injection, pump, scavenging
- 4 stroke, mech, injection
Q3 | Enthalpy of a substance is defined as
- The sum of internal energy and the work done in forcing unit mass of substance into an enclosure at the constant pressure at which the substance exists
- Sum of sensible heat + latent heat of substance
- Total heat content of substance above zero degree centigrade
- Sensible heat of water + work done in forcing unit mass of substance into an enclosure at constant pressure at which the substance exists
- None of the above
Q4 | Endurance test for I.C. engines is conducted for
- 1000 hours
- 200 hours
- 500 hours
- 400 hours
- 100 hours
Q5 | A system having connected load of 100 kW, peak load of 80 kW, base load of 20 kW and average load of 40 kW will have a load factor of
- 60%
- 40%
- 75%
- 80%
- 50%
Q6 | The value of reheat factor in case of steam turbines is usually
- 1.25 to 1.50
- 1.02 to 1.06
- 1.10 to 1.16
- 1.75 to 2.50
- 0.9 to 0.99
Q7 | A fuel of octane rating 85 matches the antiknock qualities of mixture consisting of
- 85% heptane + 15% octane
- 85% octane + 15% heptane
- 85% petrol + 15% diesel
- 85% benzene + 15% methyl alcohol
- 15% petrol + 85% diesel
Q8 | A Wankel engine combines the advantages of
- SI and CI engines
- Carburction and fuel injection
- Air cooled and reciprocating engines
- Rotory and reciprocating engines
- Axial flow and centrifugal compression
Q9 | Willian's line is relevant to
- Throttle controlled trbine
- Nozzle controlled turbines
- Impulse turbines
- Reaction turbines
- None of the above
Q10 | Starting motor in automobiles is generally
- Induction motor
- Synchronous motor
- Squirrel cage motor
- Shunt motor
- Series motor
Q11 | Three states of matter are distinguished with repect to molecules by
- Characteristics of the motion of molecules
- The number
- Energy of molecules
- The atoms in molecules
- The orientation of molecules
Q12 | Tenacity is the property of materials in which they
- Resist indentation
- Resist rupture
- Resist shearing
- Resist deformation
- None of the above
Q13 | The horse power of engine for a ship is of the order to
- 10,000 to 40,000
- 50 to 100
- 1000 to 5000
- 100 to 500
- 500 to 1000
Q14 | As the steam flows in a subsonic nozzle, in which the cross-section is decreasing in the direction of flow
- The velocity will decrease in the direction of flow
- The pressure will increase in the direction of flow
- The velocity will decrease while pressure will decrease in the direction of flow
- The velocity will increase while pressure will decrease in the direction of flow
- None of the above
Q15 | White smoke from a diesel engine can be expected during
- Start up or idling
- High speed operation
- High load operation
- All of the above
- None of the above
Q16 | Total sulphur content in a diesel fuel oil must not exceed
- 0.10%
- 0.01%
- 0.05%
- 0.50%
- 1%
Q17 | Air consumption of a four-stroke diesel engine per rated BHP/hr will be
- 20 kg
- 1 kg
- 5 - 7 kg
- 10 - 14 kg
- 15 kg
Q18 | In spark ignition engines the knocking tendency decreases
- As compression ratio is reduced
- By controlling air/fuel mixture
- By controlling ignition timing
- By controlling exhaust temperatures
- None of the above
Q19 | Water and sediments in a diesel fuel oil must not exceed.
- 0.50%
- 0.01%
- 1%
- 0.10%
- 0.05%
Q20 | Rankine cycle efficiency for fixed steam temperature of any volume upto critical temperature will be maximum for steam pressure of
- 250 kg/cm2
- 100 kg/cm2
- 200 kg/cm2
- Critical pressure
- 203.5 kg/cm2
Q21 | A certain gas occupies 2 cu-m at a temperature of 400?C. It receives heat at constant pressure till its temperature is doubled. The change in volume would be
- 0.19 cu-m
- 3.8 cu-m
- 0.038 cu-m
- 0.019 cu-m
- 3.188 cu-m
Q22 | If the power factor of an electrical system is unity, it means
- Efficiency is least
- Entire power is consumed in reactive power
- Entire power pulls the load
- Equipment is running properly
- Magnetism generated within the equipment is negligible
Q23 | A fixed quantity of heat is to be added to a system under specific conditions. The process in which the entropy change will be maximum is
- Constant pressure process
- Constant volume process
- Constant temperature process
- Isentropic process
- None of the above
Q24 | Air standard efficiency of an I.C. engine depends on
- Compression ratio
- Speed of operation
- Fuel used
- Torque
- All of the above
Q25 | Which of the following is false statement?
- Fuel consumption of engine increases if silencer is choked
- Fuel consumption of engines decreases if air filter is choked
- Fuel consumption increases if exhaust valve is burnt
- Fuel consumption increases if lean mixture is supplied
- All of the above