I.C Engines Objective Type Questions - Set 05

Practice Test: Question Set - 05

1. The compression ignition engines are governed by
    (A) Hit and miss governing
    (B) Qualitative governing
    (C) Quantitative governing
    (D) Combination of (B) and (C)

2. The reason for supercharging in any engine is to
    (A) Increase efficiency
    (B) Increase power
    (C) Reduce weight and bulk for a given output
    (D) Effect fuel economy

3. Stoichiometric ratio is
    (A) Chemically correct air-fuel ratio by weight
    (B) Chemically correct air-fuel ratio by volume
    (C) Actual air-fuel ratio for maximum efficiency
    (D) None of the above

4. Volatility of diesel fuel oil is
    (A) Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
    (B) Temperature at which it solidifies or congeals
    (C) It catches fire without external aid
    (D) Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

5. The purpose of testing an internal combustion engine is
    (A) To determine the information, which cannot be obtained by calculations
    (B) To conform the data used in design, the validity of which may be doubtful
    (C) To satisfy the customer regarding the performance of the engine
    (D) All of the above

6. The process of breaking up or a liquid into fine droplets by spraying is called
    (A) Vaporisation
    (B) Carburetion
    (C) Ionization
    (D) Atomization

7. The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called
    (A) Mechanical efficiency
    (B) Overall efficiency
    (C) Volumetric efficiency
    (D) Relative efficiency

8. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is
    (A) Same
    (B) Less
    (C) More
    (D) More or less depending on power rating

9. In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
    (A) Low density
    (B) Low temperature
    (C) Long ignition delay
    (D) All of these

10. The actual volume of fresh charge admitted in 4-stroke petrol engine is
    (A) Equal to stroke volume
    (B) Equal to stroke volume and clearance volume
    (C) Less than stroke volume
    (D) More than stroke volume

11. The power actually developed by the engine cylinder of an I.C. engine is known as
    (A) Theoretical power
    (B) Actual power
    (C) Indicated power
    (D) None of these

12. In loop scavenging, the top of the piston is
    (A) Flat
    (B) Contoured
    (C) Slanted
    (D) Depressed

13. The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is
    (A) Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
    (B) Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
    (C) Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
    (D) Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine

14. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be
    (A) 2%
    (B) 4%
    (C) 8%
    (D) 14%

15. The knocking tendency in compression ignition engines for a given fuel will be
    (A) Enhanced by decreasing compression ratio
    (B) Enhanced by increasing compression ratio
    (C) Dependent on other factors
    (D) None of the above

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Internal Combustion Engines (I.C. Engines):
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