# Internal Combustion Engines (I.C. Engines)

• ## When crude oil is heated, then which of the following hydrocarbon is given off first?_____.

• A. Kerosene
• B. Gasoline
• C. Paraffin
• D. Natural gas
Answer: Option D.
Explanation:

No answer description available for this question.

• ## The effective inhibitor of pre-ignition is_____.

• A. Alcohol
• B. Water
• C. Lead
• D. None of these
Answer: Option B.
Explanation:

No answer description available for this question.

• ## 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
Answer: Option D.
Explanation:

No answer description available for this question.

• ## 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
Answer: Option A.
Explanation:

No answer description available for this question.

• ## 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
Answer: Option B.
Explanation:

No answer description available for this question.

• ## 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
Answer: Option D.
Explanation:

No answer description available for this question.

• ## 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
Answer: Option A.
Explanation:

No answer description available for this question.

• ## 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
Answer: Option D.
Explanation:

No answer description available for this question.

• ## 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
Answer: Option A.
Explanation:

No answer description available for this question.

• ## Which of the following does not relate to a compression ignition engine?

• A. Fuel pump
• B. Fuel injector
• C. Governor
• D. Carburettor
Answer: Option D.
Explanation:

No answer description available for this question.

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