The ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of____________________?
(A) 5:25:30:50
(B) 25:35:5:35
(C) 25:5:10:60
(D) 40:30:15:15
(D) 25:5:35:35
Air injection in I.C. engines refers to injection of___________________?
(A) air only
(B) liquid fuel only
(C) liquid fuel and air
(D) supercharging
(D) does not exist
With increase in speed of vehicle, the back pressure will________________?
(A) decrease
(B) increase
(C) remain unalfected
(D) depend on other factors
(D) none of the above
A 4-stroke diesel engine needs about following amount of air_________________?
(A) 75 cc per min. per h.p.
(B) 750 cc per min. per h.p.
(C) 7500 cc per min. per h.p.
(D) 75000 cc per min. per h.p.
(D) 750000 cc per min. per h.p
Fuel consumption with increase in back pressure will________________?
(A) increase
(B) decrease
(C) remain unaffected
(D) depend on other factors
(D) none of the above
The ash content in diesel oil should bot be more than_______________?
(A) 1%
(B) 5%
(C) 0.1%
(D) 0.01%
(D) 0.001%
A fuel will detonate less if it has___________________?
(A) higher self ignition temperature
(B) lower self ignition temperature
(C) proper self ignition temperature
(D) self ingition temperature has nothing to do with detonation
(D) 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
(D) petrol engines occupy more space than diesel engines for same power output
The cooling water requirement for diesel engine is of the order of________________?
(A) 0.2 to 1.0 liter per minute per h.p.
(B) 1 to 3 liters per minute per h.p.
(C) 5 to 10 liters per minute per h.p
(D) 10 to 20 liters per minute per h.p.
(D) 20-30 liters per minute per h.p
Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?
(A) increases.
(B) decreases
(C) remains same
(D) unpredictable
(D) none of the above