Multiple Choice Questions with Answers on I.C Engines - Set 04

Practice Test: Question Set - 04


1. Flash point of 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) Temperature at which it catches fire without external aid
    (D) Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

2. In petrol engines, advancing of the spark timing will _________ the knocking tendency.
    (A) Not effect
    (B) Decrease
    (C) Increase
    (D) None of these

3. In a naturally aspirated diesel engine, the air is supplied by
    (A) A supercharger
    (B) A centrifugal blower
    (C) A vacuum chamber
    (D) An injection tube

4. A supercharged engine as compared to an ordinary engine
    (A) Requires smaller foundation
    (B) Is lighter
    (C) Consumes less lubricating oil
    (D) All of these

5. Which of the following is not an intern’s combustion engine?
    (A) 2-stroke petrol engine
    (B) 4-stroke petrol engine
    (C) Diesel engine
    (D) Steam turbine

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

7. Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided
    (A) It is properly designed
    (B) Best quality fuel is used
    (C) Cannot work as it is impossible
    (D) Flywheel size is proper

8. The object of providing masked inlet valve in the air passage of compression ignition engines is to
    (A) Enhance flow rate
    (B) Control air flow
    (C) Induce primary swirl
    (D) Induce secondary turbulence

9. In the crankcase method of scavenging, the air pressure is produced by
    (A) Supercharger
    (B) Centrifugal pump
    (C) Natural aspirator
    (D) Movement of engine piston

10. The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)
    (A) B.P = (Wl × 2πN)/60 watts
    (B) B.P = [(W - S) πDN]/60 watts
    (C) B.P = [(W - S) π (D + d) N]/60 watts
    (D) All of these

11. The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed
    (A) 80°C
    (B) 120°C
    (C) 180°C
    (D) 240°C

12. Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.
    (A) Equal to
    (B) Less than
    (C) Greater than
    (D) None of these

13. Scavenging is usually done to increase
    (A) Thermal efficiency
    (B) Speed
    (C) Power output
    (D) Fuel consumption

14. If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by
    (A) [2(V₀/V₁)]/ [1 + (V₀/V₁)²]
    (B) (V₀/V₁)/ [1 + (V₀/V₁)²]
    (C) V₀/(V₀  + V₁)
    (D) V₁/(V₀  + V₁)

15. The pressure and temperature at the end of compression stroke in a petrol engine are of the order of
    (A) 4-6 kg/cm² and 200-250°C
    (B) 6-12 kg/cm² and 250-350°C
    (C) 12-20 kg/cm² and 350-450°C
    (D) 20-30 kg/cm² and 450-500°C

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Internal Combustion Engines (I.C. Engines):
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