41
The following volume of air is required for consuming 1 liter of fuel by a four stroke engine
Answer: 9-10 m3
Questions
42
A 5 BHP engine running at full load would consume diesel of the order of
Answer: 1 kg/hr
43
Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided
Answer: can not work as it is impossible
45
A hmh flame speed is obtained in diesel engine when air fuel ratio is
Answer: about 10% rich mixture
46
Volatility of diesel fuel oil is
Answer: indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
49
In the crankcase method of scavenging, the air pressure is produced by
Answer: movement of engine piston
50
In a typical medium speed 4-stroke cycle diesel engine the inlet valve
Answer: opens at 20° before top dead center and closes at 35° after the bottom dead center
51
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be
Answer: 14%
52
An engine indicator is used to determine the following
Answer: m.e.p. and I.H.P.
53
The accunmulation of carbon in a cylinder results in increase of
Answer: increasing the compression ratio
54
When crude oil is heated, then which of the following hydrocarbon is given off first.
Answer: natural gas
55
The rating of a diesel engine, with increase in airintlet temperature, will
Answer: decrease linearly
57
Polymerisation is a chemical process in which molecules of a compound become
Answer: larger
58
In diesel engine, the compression ratio in comparison to expansion ratio is
Answer: more
59
Engine pistons 'are usually made of aluminium alloy because it
Answer: is lighter
60
The size of inlet valve of.an engine in comparison to exhaust valve is
Answer: less
