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This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 15
Q1 | Change in internal energy is least during
- 25 to 30
- Constant pressure process
- Constant volume process
- Adiabatic process
- Isothermal process
Q2 | Which of the following is not a petroleum product?
- Methylated spirit
- Lubricating oil
- Kerosene
- Carbon dioxide
- Petrol
Q3 | Thermal efficiency of a standard Otto cycle for a compression ratio 5.5, will be
- 100%
- 47.50%
- 20%
- 35.40%
- 50%
Q4 | The calorific value of methane can be determined by
- Bomb calorimeter
- Bunsen's calorimeter
- Orsat's apparatus
- Exhaust gas calorimeter
- None of the above
Q5 | The fact that the product of pressure and volume of a fixed amount of gas is approximately a constant value is known as
- Charle's law
- Gay Lusac's law
- Dalton's law
- Lewis law
- None of the above
Q6 | Air fuel ratio for a jet engine is of the order of
- 60;1
- 15;1
- 600;1
- 20;1
- 10;1
Q7 | A steam nozzle is said to be choked when
- Pressure at throat is equal to steam supply pressure
- Throat gets clogged
- Flow is at maximum value of critical exit pressure
- Steam flow through nozzle ceases
- Pressure at throat is less than the exit pressure
Q8 | In a four stroke cycle the minimum temperature inside the engine cylinder occurs
- At the end of exhaust stroke
- At the end of suction stroke
- At the end of compression stroke
- At the beginning of exhaust stroke
- At the beginning of suction stroke
Q9 | According to Charle's law
- At constant pressure the volume of a gas is proportional to its absolute temperature
- At constant temperature, pressure is proportional to temperature
- At constant temperature, pressure of a gas is proportional to its volume
- At constant volume the absolute pressure is proportional to the temperature
- None of the above
Q10 | Prony brakes are used for testing
- Slow speed engines
- High speed engines
- Engines with small flywheel
- Small engines
- Large capacity engines
Q11 | In wet dry lubrication of diesel engines
- Oil is splashed
- Oil is splashed and pumped to various points
- Oil is pumped to various points
- All of the above
- None of the above
Q12 | In a velocity compounded impulse turbine, while steam flows through the second row of moving blades
- The velocity increases
- The velocity reduces
- Both velocity as well as pressure increase
- The velocity remains constant
- The pressure remains constant
Q13 | Ignition accelerators are often used for
- Diesel engine fuels
- Petrol engine fuels
- Gas turbine fuels
- Gas generators
- All of the above
Q14 | Which one of the following statements is incorrect
- Combustion is the processes of heat liberation
- Combustion is a chemical reaction
- Combustion is rapid oxidation
- All of the above
- None of the above
Q15 | During idling in a compression ignition engine the air fuel ratio may be of the order of
- 5
- 20
- 10
- 15
- 30
Q16 | Solid injection in diesel engines implies
- Use of solid fuels
- Supply of fuel in the form of solid
- Injecting fuel with lubricating oil
- Injecting fuel and air simultaneously
- Injecting fuel without air
Q17 | Which fuel has maximum resistance to detonation
- Alcohol
- n-Heptane
- Toulene
- Iso-octane
- Benzene
Q18 | The level of oil in engine cylinder should be checked when the engine is
- Not running
- Running
- During starting
- During cranking
- None of the above
Q19 | The molecular weight of a mixture containing 20% oxygen, 20 percent nitrogen and 60 percent carbon dioxise on volume bases will be nearly
- 38.4
- Carbon dioxide
- 41.4
- 29.9
- 33.3
Q20 | Dissociation is
- Process of heat liberation in which no flame exist
- Same is combustion
- Combustion without heat
- Slow combustion
- Smokeless combustion
Q21 | Thermodynamic processes are those
- Where a difference is observed in any macroscopic property of the system between different times or state
- Where a difference is observed in any microscopic property of the system between different times or state
- Which occurs in the direction of an intensive property or driving force contained within the system
- Which require an agency outside the system to force the process
- None of the above
Q22 | A Lungistrom turbine is a
- Radial flow reaction turbine
- Axial flow reaction turbine
- Radial flow impulse turbine
- Mixed flow impulse turbine
- None of the above
Q23 | Highest useful compression ratio is the compression ratio at which
- An engine can be safely operated
- An engine gives maximum thermal efficiency
- An engine operates smoothly
- Detonation first becomes audible
- None of the above
Q24 | The pour point of diesel fuel oil must be
- More than the coldest atmospheric temperature at which oil is to be pumped
- Less than 0?C
- Less than the coldest atmospheric temperature of which oil is to be pumped
- More than 100?C
- More than 0?C
Q25 | The emission of carbon monoxide in automobile exhaust will be low when the vehicle is
- Cruising at low speeds
- Idling
- Decelerating
- Cruising at high speeds
- Accelerating