A. accelerates auto-ignition
B. helps to resist auto-ignition
C. does not affect auto-ignition
D. has no relation with auto-ighition
E. retards auto-ignition
Related Mcqs:
- An engine has a normal speed of 960 r.p.m. and no load speed of 1000 r.p.m. The speed droop of governor will be about___________________?
A. 2%
B. 4%
C. 8%
D. ±4%
E. 1%. - The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed____________________?
A. 80°C
B. 120°C
C. 180°C
D. 240°C
E. 320°C - The resultant of all normal pressures acts___________________?
A. at e.g. of body
B. at center of pressure
C. vertically upwards
D. at metacentre
E. vertically downwards - The normal stress is same in all directions at a point in a fluid_______________?
A. only when the fluid is frictionless
B. only when the fluid is incompressible and has zero viscosity
C. when there is no motion of one fluid layer relative to an adjacent layer
D. irrespective of the motion of one fluid layer relative to an adjacent layer
E. in case of an ideal fluid - For a body floating in a liquid the normal pressure exerted by the liquid acts at ____________________?
A. bottom surface of the body
B. e.g. of the body
C. metacentre
D. all points on the surface of the body
E. all of the above - The normal stress in a fluid will be constant in all directions at a point only if__________________________?
A. it is incompressible
B. it has uniform viscosity
C. it has zero viscosity
D. it is frictionless
E. it is at rest - Ignition quailty of petrol is expressed by___________________?
A. octane number
B. cetane number
C. calorific value
D. self ignition temperature
E. distillation temperature - According to Recardo’s theory, detonation occurs due to______________________?
A. instantaneous auto-ignition of last part of charge to be burnt
B. improper mixing of air and fuel
C. improper combustion
D. self ignition temperature has nothing to do with detonation
E. none of the above - The thermal efficiency of a two cycle engine as compared to four cycle engine is_________________?
A. more
B. less
C. same
D. more upto some load and then less
E. it may be less or more depending on several other factors - The termal efficiency of a petrol engine at design load is around_________________?
A. 90%
B. 50%
C. 40%
D. 30%
E. 15%.
