Internal Combustion Engines MCQs

Mechanical Engineering Objective Questions

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274. The power to weight ratio of diesel engine compared to petrol engine is

D. High in some cases and low in other cases

275. Flash point for diesel fuel oil should be

A. Minimum 49°C

B. Maximum 49°C

C. Minimum 99°C

D. Maximum 99°C

276. Vapour lock is

A. Supply of liquid fuel particles to engine

B. Complete or partial stoppage of fuel supply due to vaporisation of fuel in supply system.

C. Excess fuel supply to engine due to faster vaporisation

D. Seizure or partial stoppage ot fuel supply due to vaporization of fuel in supply system

277. Which of the following does not assist in getting higher output from diesel engine

A. High compression ratio

B. High excess air

C. High fuel air ratio

D. Fine atomisation of fuel

278. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft

279. In a diesel engine, the fuel is ignited by

B. Injected Fuel

C. Heat Resulting From Compressing Air That Is Supplied For Combustion

280. Scavenging air in diesel engine means

A. Air Used For Combustion Sent Under Pres-Sure

B. Forced Air For Cooling Cylinder

C. Burnt Air Containing Products Of Combustion

D. Air Used For Forcing Burnt Gases Out Of Engine?S Cylinder During The Exhaust Period

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