- Ultimate SBI and IBPS PO Interview
- C Interview Questions
- Frequently-asked Basic UNIX
- TOP ELECTRICAL ENGINEERING
Ultimate SBI and IBPS PO Interview
(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 ed (a) net efficiency (b) efficiency ratio (c) relative efficiency (d) overall efficiency (e) cycle efficiency.
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.
Frequently-asked Basic UNIX
engine are usually based on (a) low heat value of oil (b) hh heat value of oil (c) net calorific value of oil (d) calorific value of fuel (e) all of the above. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be (a) 2% (b) 4% (c) 8% (d) 14% (e) 27%. In case of gas turbines, the gaseous fuel consumption guarantees are based on (a) hh heat value (b) low heat value (c) net calorific value (d) middle heat value (e) calorific value. In a typical medium speed 4-stroke cycle diesel engine the inlet valve (a) opens at 20° before top dead center and closes at 35° after the bottom dead center (b) opens at top dead center and closes at bottom dead center (c) opens at 10° after top dead center and closes 20° before the bottom dead center (d) may open or close anywhere (e) remains open for 200°. The pressure and temperature at the end of compression stroke in a petrol engine are of the order of (a) 4 – 6 kg/cm2 and 200 – 250°C (b) 6 – 12 kg/cm2 and 250 – 350°C (c) 12 – 20 kg/cm2 and 350 – 450°C (d) 20 – 30 kg/cm2 and 450 – 500°C (e) 30 – 40 kg/cm2 and 500 – 700°C. The pressure at the end of compression in the case of diesel engine is of the order of (a) 6 kg/cm (b) 12kg/cmz (c) 20 kg/cmz (d) 27.5 kg/cmz (e) 35 kg/cm Ans: e 22. The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will (a) increase (b) decrease (c) be independent (d) may increase or decrease depending on other factors (e) none of the above. Pick up the wrong statement (a) 2-stroke engine can run in any direction (b) In 4-stroke engine, a power stroke is obtained in 4-strokes (c) thermal efficiency of 4-stroke engine is more due to positive scavenging (d) petrol engines work on otto cycle (e) petrol engines occupy more space than diesel engines for same power output. Combustion in compression nition engines is (a) homogeneous (b) heterogeneous (c) both (a) and (b) (d) laminar (e) turbulent. The fuel in diesel engine is normally injected at pressure of (a) 5-10 kg/cm2 (b) 20-25 kg/cm2 (c) 60-80 kg/cm2 (d) 90-130 kg/cm2 (e) 150-250 kg/cm2 Ans: d 27.
TOP ELECTRICAL ENGINEERING
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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