Hot air standard diesel cycle efficiency with increase in value of C„_______________?
(A) increases
(B) decreases
(C) remains unaffected
(D) depends on other factors
(D) unpredictable
In open combustion chamber in diesel engines____________________?
(A) the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture
(B) fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
(C) only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
(D) fuel is injected at atmospheric pres¬sure
(D) there are no valves.
In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will_________________?
(A) increase the knocking tendency
(B) decrease the knocking tendency
(C) not affect the knocking tendency
(D) increase or decrease knocking tendency depending on strength and time of spark
(D) unpredictable
Theoretically, the following engine should have maximum efficiency________________?
(A) gas engine
(B) 2-stroke S.I. engine
(C) 4-stroke S.I. engine
(D) steam engine
(D) 4-stroke C.I. engine
The thermal efficiency of a diesel engine is of the order of_________________?
(A) 92%
(B) 68%
(C) 52%
(D) 34%
(D) 25%.
The ignition coil in diesel engines produces voltage of the order of________________?
(A) 6 to 12 volts
(B) 240 volts
(C) 1000 volts
(D) 20,000 volts
(D) 80,000 volts
In precombustion chamber in diesel engine________________?
(A) The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of fuel mixture
(B) Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
(C) Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
(D) There are no valves
In a diesel engine, injection pressure developed by injector is of the order of______________?
(A) 10 kg/cm2
(B) 100 kg/cm2
(C) 500 kg/cm2
(D) 1400 kg/cm2
In the case of petrol engine at maximum output, the percentage of CO in exhaust gases is ____________________?
(A) Zero
(B) 5-10%
(C) Depends on load and quality of fuel
(D) Considerable percent
All the four operations in two stroke engine are performed in following number of revolutions of crank shaft______________________?
(A) Half
(B) One
(C) Two
(D) Four