- (A) lean mixture has high reaction time
- (B) rich mixture has high reaction time
- (C) chemically correct mixture has mini-mum reaction time
- (D) all of the above
- (E) non of the above
Mechanical Engineering Mcqs
- (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 plunger starts to pump fuel
- (C) time corresponding to actual injection and top dead center
- (D) time corresopnding to actual ingition and top dead center
- (E) none of the above
- (A) heavy turbulence
- (B) improved scavenging
- (C) heavy supercharging
- (D) detonation
- (E) preignition
- (A) cetane
- (B) mixture of cetane and alphamethyl napthalene
- (C) ethylene dibromide
- (D) mixture of aldehydes and ketones
- (E) mixture of cetane with tetra-ethyl lead
- (A) higher
- (B) lower
- (C) same
- (D) depends on quality of fuel
- (E) unpredictable
- (A) has zero cetane number
- (B) has 100 cetane number
- (C) helps detonation
- (D) is a straight chain paraffin
- (E) determines the efficiency of an I.
- (A) has octane number of 0
- (B) has octane number of 50
- (C) has octane number of 100
- (D) is an index of detonation quality
- (E) is an index of knocking quality
- (A) 30 – 65°C
- (B) 65 – 220°C
- (C) 220 – 350°C
- (D) 350 – 450°C
- (E) 450-550°C
- (A) compact design requiring lesser space
- (B) improved distribution of air to cylinder
- (C) casting less liable to distortion
- (D) reduced torsional vibration because of shorter crankshaft
- (E) less overhead clearance
- (A) peroxides, aldehydes and ketones
- (B) peroxides, aldehydes, oxides and sul-phides
- (C) aldehydes, oxides and ketones
- (D) ketones and sulphur compounds
- (E) none of the above
