In a cycle, the spark lasts roughly for ____________________?
(A) 1 sec
(B) 0.1 sec
(C) 0.01 sec
(D) 0.001 sec
(D) 0.0001 sec
A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?
(A) more efficient
(B) less efficient
(C) equally efficient
(D) unperdictable
(D) other factors will decide it
Most high speed compression engines operate on ___________________?
(A) Otto cycle
(B) Diesel cycle
(C) Dual cycle
(D) Carnot cycle
(D) Two stroke cycle
The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?
(A) 1500 rpm
(B) 750 rpm
(C) 3000 rpm
(D) any value independent of engine speed
(D) none of the above
The term scavenging is generally associated with______________________?
(A) 2-stroke cycle engines
(B) 4-stroke cycle engines
(C) aeroplane engines
(D) diesel engines
(D) high efficiency engines
Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?
(A) the friction is high
(B) the friction is unpredictable
(C) the small difference in cooling water temperature or in internal friction has a disproportionate effect
(D) the engine is rarely operated
(D) none of the above
A diesel engine has_________________?
(A) 1 valve
(B) 2 valves
(C) 3 valves
(D) 4 valves
(D) no valve
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__________________?
(A) it is properly designed
(B) best quality fuel is used
(C) can not work as it is impossible
(D) flywheel size is proper
(D) engine cooling is stopped
A hmh flame speed is obtained in diesel engine when air fuel ratio is_______________?
(A) uniform throughout the mixture
(B) chemically correct mixture
(C) about 3-5% rich mixture
(D) about 10% rich mixture
(D) about 10% lean mixture
Volatility of diesel fuel oil is_________________?
(A) minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
(B) temperature at which it solidifies or congeals
(C) it catches fire without external aid
(D) indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
(D) temperature at which it flows easily