Mechanical IC Engines MCQ Part 3
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Attempt Free Mechanical IC Engines MCQ Part 3 Here. Read The Important Mechanical MCQ From Below.
Q1. Supercharging is the process of.
A. supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
B. providing forced cooling air
C. injecting excess fuel for raising more load
D. supplying compressed air to remove combustion products fully
Answer : A
Q2. The calorific value of gaseous fuels is expressed in terms of
A. kcal
B. kcal/kg
C. kcal/m2
D. kcal/n?
E. all of the above.
Answer : D
Mechanical IC Engines MCQ Part 3
Q3. Fuel oil consumption guarantees for I .C. engine are usually based on.
A. low heat value of oil
B. high heat value of oil
C. net calorific value of oil
D. calorific value of fuel
Answer : B
Q4. If the intake air temperature of I.C. engine increases, its efficiency will
A. increase
B. decrease
C. remain same
D. unpredictable
E. depend on other factors.
Answer : B
Mechanical IC Engines MCQ Part 3
Q5. Combustion in compression ignition engines is.
A. homogeneous
B. heterogeneous
C. both (a) and (b)
D. laminar
Answer : B
Q6. All heat engines utilize
A. low heat value of oil
B. high heat value of oil
C. net claorific value of oil
D. calorific value of fuel
E. all of the above.
Answer : A
Mechanical IC Engines MCQ Part 3
Q7. Which of the following is not an interna combustion engine.
A. 2-stroke petrol engine
B. 4-stroke petrol engine
C. diesel engine
D. steams turbine.
Answer : D
Q8. An engine indicator is used to determine the following
A. speed
B. temperature
C. volume of cylinder
D. m.e.p. and I.H.P.
E. BHP.
Answer : D
Mechanical IC Engines MCQ Part 3
Q9. Which of the following statements is correct?
A. All the irreversible engines have same efficiency
B. All the reversible engines have same efficiency
C. Both Rankine and Caront cycles have same efficiency between same tempera¬ture limits
D. All reversible engines working between same temperature limits have same-ef-ficiency
Answer : D
Q10. Fuel oil consumption guarantees for I .C. engine are usually based on
A. low heat value of oil
B. high heat value of oil
C. net calorific value of oil
D. calorific value of fuel
E. all of the above.
Answer : B
Mechanical IC Engines MCQ Part 3
Q11. The rating of a diesel engine, with increase in air-intlet temperature, will.
A. increase linearly
B. decrease linearly
C. increase parabolically
D. decrease parabolically
Answer : B
Q12. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be
A. 2%
B. 4%
C. 8%
D. 14%
E. 27%.
Answer : D
Mechanical IC Engines MCQ Part 3
Q13. Engine pistons ‘are usually made of aluminum alloy because it.
A. is lighter
B. wears less
C. absorbs shocks
D. is stronger
Answer : A
Q14. In case of gas turbines, the gaseous fuel consumption guarantees are based on
A. high heat value
B. low heat value
C. net calorific value
D. middle heat value
E. calorific value.
Answer : B
Mechanical IC Engines MCQ Part 3
Q15. Pick up the wrong statement about supercharging.
A. supercharging reduces knocking in diesel engines
B. there can be limited supercharging in petrol engines because of detonation
C. supercharging at high altitudes is essential
D. supercharging results in fuel economy
Answer : D
