- A. Kerosene
- B. Gasoline
- C. Paraffin
- D. Natural gas
Internal Combustion Engines (I.C. Engines)
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When crude oil is heated, then which of the following hydrocarbon is given off first?_____.
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The effective inhibitor of pre-ignition is_____.
- A. Alcohol
- B. Water
- C. Lead
- D. None of these
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The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the_____.
- A. Jet area is automatically varied depending on the suction
- B. The flow from the main jet is diverted to the compensating jet with increase in speed
- C. The diameter of the jet is constant and the discharge coefficient is invariant
- D. Flow is produced due to the static head in the float chamber
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All heat engines utilize_____.
- A. Low heat value of oil
- B. High heat value of oil
- C. Net calorific value of oil
- D. Calorific value of fuel
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Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?
- A. Inlet valve closing after bottom dead center
- B. Inlet valve closing before bottom dead center
- C. Inlet valve opening before top dead center
- D. Exhaust valve closing after top dead center
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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
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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
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The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to_____.
- A. Inject fuel in a chamber of high pressure at the end of compression stroke
- B. Inject fuel at a high velocity to facilitate atomization
- C. Ensure that penetration is not high
- D. All of the above
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The ignition of the charge by some hot surface within the engine before the passage of spark is called_____.
- A. Pre-ignition
- B. Detonation
- C. Ignition delay
- D. Auto-ignition
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Which of the following does not relate to a compression ignition engine?
- A. Fuel pump
- B. Fuel injector
- C. Governor
- D. Carburettor
- 1
- 2