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C interview questions for freshers pdf

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11 The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be (a) higher (b) lower (c) same (d) depends on size of engine (e) unpredictable. Ignition quailty of petrol is expressed by (a) octane number (b) cetane number (c) calorific value (d) self ignition temperature (e) distillation temperature. Petrol is distilled at a temperature in range of (a) 30 – 65°C (b) 65 – 220°C (c) 220-350°C (d) 350-450°C (e) 450-550°C. Kerosene is distilled at (a) 30 – 65°C (b) 65 – 220°C (c) 220 – 350°C (d) 350 – 450°C (e) 450-550°C. Self-ignition temperature of petrol is of the order of (a) 150°C (b) 240°C (c) 370°C (d) 450°C (e) more than 500°C. Iso-oct ,ne (a) has octane number of 0 (b) has octane number of 50 (c) has octane number of 100 (d) is an index of detonation quality (e) is an index of knocking quality. Octane number is determined by comparing the performance of the petrol with the following hydrocarbons (a) iso-octane (b) mixture of normal heptane and iso-oc-tane (c) alpha methyl napthalene (d) mixture of methane and ethane (e) mixture of paraffins and aromatics. Cetane (a) has zero cetane number (b) has 100 cetane number (c) helps detonation (d) is a straight chain paraffin (e) determines the efficiency of an I.

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C engines occurs duto (a) leaking piston rings (b) use of thick head gasket (c) clogged air-inlet slots (d) increase in clearance volume caused b bearing-bushing wear (e) all of the above. The specific fuel consumption per BH hour for a petrol engine is approximately (a) 0.15 kg (b) 0.2 kg (c) 0.25 kg (d) 0.3kg (e) 0.35 kg. The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion is (a) more (b) loss (c) same (d) may be more or less depending on engine capacity (e) unpredictable.

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C engine remains open for nearly (a) 180° (b) 125° (c) 235° (d) 200° (e) 275°. Which of the following is not an interns combustion engine (a) 2-stroke petrol engine (b) 4-stroke petrol engine (c) diesel engine (d) gas turbine (e) steam turbine. Pick up the false statement (a) Thermal efficiency of diesel engine i about 34% (b) Theoretically correct mixture of air am petrol is approximately 15 : 1 (c) High speed compression engines operate on dual combustion cycle (d) Diesel engines are compression ignition engines (e) S.

C Interview Questions

If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the (a) exhaust will be smoky (b) piston rings would stick into piston grooves (c) exhaust temperature will be high (d) engine starts overheating (e) scavenging occurs. The output of a diesel engine can be increased without increasing the engine revolution or size in following way (a) feeding more fuel (b) increasing flywheel size (c) heating incoming air (d) scavenging (e) supercharging. It the temperature of intake air in IC engines is lowered, then its efficiency will (a) increase (b) decrease (c) remain same (d) increase upto certain limit and then decrease (e) decrease upto certain limit and then in-crease. In a typical medium speed 4-stroke cycle diesel engine (a) compression starts at 35° after bottom dead center and ends at top dead center (b) compression starts at bottom dead center and ends at top dead center (c) compression starts at 10° before bottom dead center and, ends just before top dead center (d) may start and end anywhere (e) none of the above. For the same compression ratio (a) Otto cycle is more efficient than the Diesel (b) Diesel cycle is more efficient’than Otto (c) both Otto and Diesel cycles are, equally efficient (d) compression ratio has nothing to do with efficiency (e) which is more efficient would depend on engine capacity. The precess of breaking up or a lipuid into fine droplets by spraying is called (a) vaporisation (b) carburetion (c) ionisation (d) injection (e) atomisation.


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