The function of a fuel pump in a petrol pump is to______________________?
(A) inject fuel in cylinder
(B) supply fuel when carburettor fails
(C) pump fuel so that it reaches carburettor (to improve thermal efficiency)
(D) does not exist
The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________?
(A) higher
(B) lower
(C) same
(D) depends on size of engine
(D) unpredictable.
The spark plug gap is normally maintained at________________?
(A) 0.1 to 0.2 mm
(B) 0.2 to 0.4 mm
(C) 0.45 to 0.6 mm
(D) 0.6 to 0.8 mm
(D) 0.8 to 1 mm
The delay period in petrol engine is of the order of__________________?
(A) 0.001 sec
(B) 0.002 see
(C) 0.01 sec
(D) 0.05 sec
(D) 0.1 sec
Auto-ignition temperature 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) that at which it catches fire without external aid
(D) indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
(D) indicated by 50% distillation temperature
Petrol is distilled at a temperature in range of__________________?
(A) 30 – 65°C
(B) 65 – 220°C
(C) 220-350°C
(D) 350-450°C
(D) 450-550°C
Self-ignition temperature of petrol is of the order of___________________?
(A) 150°C
(B) 240°C
(C) 370°C
(D) 450°C
(D) more than 500°C.
Octane number is determined by comparing the performance of the petrol with the following hydrocarbons__________________?
(A) iso-octane
(B) mixture of normal heptane and iso-oc-tane
(C) alpha methyl napthalene
(D) mixture of methane and ethane
(D) mixture of paraffins and aromatics
Injection lag is_________________?
(A) the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature
(B) time before actual fuel injection and the pump pluger starts to pump fuel
(C) time corresponding to actual injection and top dead center
(D) time corresponding to actual ignition and top dead center
(D) none of the above
Carbon residue in diesel oil should not be more than___________________?
(A) 1%
(B) 0.5%
(C) 0.1%
(D) 0.01%
(D) 0.001%