I.C Engines Objective Test Set - 11

Practice Test: Question Set - 11


1. The reflectivity depends upon
    (A) Geometry of the reflector
    (B) Energy of neutrons
    (C) Properties of the reflector
    (D) All of these

2. The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be
    (A) Higher
    (B) Lower
    (C) Remain unaffected
    (D) None of the above

3. The sensing element in the control system of nuclear reactors measures the _________ of the neutron flux in the reactor.
    (A) Temperature
    (B) Volume
    (C) Density
    (D) None of these

4. Pick up the wrong statement
    (A) 2-stroke engine can run in any direction
    (B) In 4-stroke engine, a power stroke is obtained in 4-strokes
    (C) Thermal efficiency of 4-stroke engine is more due to positive scavenging
    (D) Petrol engines occupy more space than diesel engines for same power output

5. If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is
    (A) V₁ / (V₀ + V₁)
    (B) V₀ / (V₀ + V₁)
    (C) 2V₀ / (V₀ + V₁)
    (D) 2V₁ / (V₀ + V₁)

6. In a cycle, the spark lasts roughly for
    (A) 1 sec
    (B) 0.1 sec
    (C) 0.01 sec
    (D) 0.001 sec

7. Which of the following does not relate to a compression ignition engine?
    (A) Fuel pump
    (B) Fuel injector
    (C) Governor
    (D) Carburettor

8. Air fuel ratio for idling speed of a petrol engine is approximately
    (A) 1 : 1
    (B) 5 : 1
    (C) 10 : 1
    (D) 15 : 1

9. The advancing of spark timing in spark ignition engines will _________ knocking tendency.
    (A) Increase
    (B) Reduce
    (C) Not effect
    (D) None of these

10. The fuel in diesel engine is normally injected at pressure of
    (A) 5-10 kg/cm²
    (B) 20-25 kg/cm²
    (C) 60-80 kg/cm²
    (D) 90-130 kg/cm²

11. A mixture containing 65% of iso-octane and 35% of normal heptane will have
    (A) Cetane number 65
    (B) Octane number 65
    (C) Cetane number 35
    (D) Octane number 35

12. The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will
    (A) Increase
    (B) Decrease
    (C) Be independent
    (D) May increase or decrease depending on other factors

13. Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.
    (A) Half
    (B) Same
    (C) Double
    (D) Four times

14. The calorific value of gaseous fuels is expressed in terms of
    (A) kcal
    (B) kcal/kg
    (C) kcal/m²
    (D) kcal/m3

15. The pressure at the end of compression, in diesel engines, is approximately
    (A) 10 bar
    (B) 20 bar
    (C) 25 bar
    (D) 35 bar

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Internal Combustion Engines (I.C. Engines):
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