- TOP ELECTRONICS and
- TOP I. C. ENGINES Objective
- HR Interview Questions and Answers -
- C Interview Questions
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TOP ELECTRONICS and
The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft (a) 1/2 (b) 1 (c) 2 (d) 4 (e) 8. In a diesel engine, the fuel is ignited by (a) spark (b) injected fuel (c) heat resulting from compressing air that is supplied for combustion (d) ignition (e) combustion chamber. 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 (e) air fuel mixture. Supercharging is the process of (a) supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere (b) providing forced cooling air (c) injecting excess fuel for raising more load (d) supplying compressed air to remove combustion products fully (e) raising exhaust pressure. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ? engines is (a) the ratio of volumes of air in cylinder before compression stroke and after compression stroke (b) volume displaced by piston per stroke and clearance volume in cylinder (c) ratio of pressure after compression and before compression (d) swept volume/cylinder volume (e) cylinder volume/swept volume. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is (a) same (b) less (c) more (d) more or less depending on power rating (e) unpredictable. The calorific value of gaseous fuels is expressed in terms of (a) kcal (b) kcal/kg (c) kcal/m2 (d) kcal/n?
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TOP I. C. ENGINES Objective
(a) yes (b) no (c) to some extent (d) unpredictable (e) depends on other factors. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called (a) net efficiency (b) efficiency ratio (c) relative efficiency (d) overall efficiency (e) cycle efficiency.
HR Interview Questions and Answers -
engine increases, its efficiency will (a) increase (b) decrease (c) remain same (d) unpredictable (e) depend on other factors. All heat engines utilize (a) low heat value of oil (b) high heat value of oil (c) net claorific value of oil (d) calorific value of fuel (e) all of the above. An engine indicator is used to determine the following (a) speed (b) temperature (c) volume of cylinder (d) m.e.p.
C Interview Questions
The specific fuel consumption per BHP hour for diesel engine is approximately (a) 0.15 kg (b) 0.2 kg (c) 0.25 kg (d) 0.3 kg (e) 0.35 kg. The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed (a) 80°C (b) 120°C (c) 180°C (d) 240°C (e) 320°C.
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