I.c. Engines MCQs

Option A: Otto cycle is more efficient than the Diesel

Option B: Diesel cycle is more efficient’than Otto

Option C: both Otto and Diesel cycles are, equally efficient

Option D: compression ratio has nothing to do with efficiency

Correct Answer: Otto cycle is more efficient than the Diesel ✔

Option A: increase

Option B: decrease

Option C: remain same

Option D: increase upto certain limit and then decrease

Correct Answer: increase ✔

Option A: exhaust will be smoky

Option B: piston rings would stick into piston grooves

Option C: exhaust temperature will be high

Option D: engine starts overheating

Correct Answer: scavenging occurs ✔

Option A: 180°

Option B: 125°

Option C: 235°

Option D: 200°

Correct Answer: 235° ✔

Option A: 0.15 kg

Option B: 0.2 kg

Option C: 0.25 kg

Option D: 0.3kg

Correct Answer: 0.25 kg ✔

Option A: first a mild explosion followed by a bi explosion

Option B: first a big explosion followed by a mil explosion

Option C: both mild and big explosions occi simultaneously

Option D: never occurs

Correct Answer: first a mild explosion followed by a bi explosion ✔

Option A: 500- 1000°C

Option B: 1000- 1500°C

Option C: 1500-2000°C

Option D: 2000-2500°C

Correct Answer: 2000-2500°C ✔

Option A: 5-10 kg/cm2

Option B: 20-25 kg/cm2

Option C: 60-80 kg/cm2

Option D: 90-130 kg/cm2

Correct Answer: 90-130 kg/cm2 ✔

Option A: 4 – 6 kg/cm2 and 200 – 250°C

Option B: 6 – 12 kg/cm2 and 250 – 350°C

Option C: 12 – 20 kg/cm2 and 350 – 450°C

Option D: 20 – 30 kg/cm2 and 450 – 500°C

Correct Answer: 6 – 12 kg/cm2 and 250 – 350°C ✔

Option A: high heat value

Option B: low heat value

Option C: net calorific value

Option D: middle heat value

Correct Answer: low heat value ✔

Option A: low heat value of oil

Option B: high heat value of oil

Option C: net calorific value of oil

Option D: calorific value of fuel

Correct Answer: high heat value of oil ✔

Option A: low heat value of oil

Option B: high heat value of oil

Option C: net claorific value of oil

Option D: calorific value of fuel

Correct Answer: low heat value of oil ✔

Option A: kcal

Option B: kcal/kg

Option C: kcal/m2

Option D: kcal/m²

Correct Answer: kcal ✔

Option A: the ratio of volumes of air in cylinder before compression stroke and after compression stroke

Option B: volume displaced by piston per stroke and clearance volume in cylinder

Option C: ratio of pressure after compression and before compression

Option D: swept volume/cylinder volume

Correct Answer: the ratio of volumes of air in cylinder before compression stroke and after compression stroke ✔

Option A: supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

Option B: providing forced cooling air

Option C: injecting excess fuel for raising more load

Option D: supplying compressed air to remove combustion products fully

Correct Answer: supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere ✔