ic engines objective questions with answers part4

Q1. The minimum cranking speed in case of petrol engine is about
(A) half the operating speed
(B) one-fourth of operating speed
(C) 350-400 rpm
(D) 60-80 rpm

Q2. Flash point of fuel oil is
(A) minimum temperature to which1 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) temperature at which it catches fire without external aid
(D) indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

Q3. The mean effective pressure obtained from engine indicator indicates the
(A) maximum pressure developed
(B) minimum pressure
(C) exhaust pressure
(D) average pressure

Q4. the same power developed in I.C. engines, the cheaper system is
(A) naturally aspirated
(B) supercharged
(C) centrifugal pump
(D) turbo charger

Q5. Installation of supercharger on a four-cycle diesel engine can result in the following percentage increase in power
(A) upto 25%
(B) upto 50%
(C) upto 75%
(D) upto 100%

Q6. Scavenging is usually done to increase
(A) thermal efficiency
(B) speed
(C) power output
(D) fuel consumption

Q7. Which of the following is the lightest and most volatile liquid fuel
(A) diesel
(B) kerosene
(C) fuel oil
(D) gasoline

Q8. The theoretically correct air fuel ratio for petrol engine is of the order of
(A) 06:01:00
(B) 09:01:00
(C) 11:01:00
(D) 15:01:00

Q9. Air fuel ratio for idling speed of a petrol engine is approximately
(A) 01:01:00
(B) 05:01:00
(C) 10:01:00
(D) 15:01:00

Q10. Air fuel ratio at which a petrol engine can not work is
(A) 18:01:00
(B) 10:01:00
(C) 15:01:00
(D) 20 : 1 and less

Q11. For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of
(A) 09:01:00
(B) 12:01:00
(C) 15:01:00
(D) 18:01:00

Q12. Pour point of fuel oil is the
(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) it catches fire without external aid
(D) indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

Q13. Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided
(A) it is properly designed
(B) best quality fuel is used
(C) can not work as it is impossible
(D) flywheel size is proper

Q14. The knock in diesel engine occurs due to
(A) instantaneous and rapid burning of the first part of the charge
(B) instantaneous atuo iginition of last part of charge
(C) delayed burning of the first part of the charge
(D) reduction of delay period

Q15. Volatility of diesel fuel oil 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) it catches fire without external aid
(D) indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

Q16. Which is more viscous lubricant oil
(A) SEA 30
(B) SAE 50
(C) SAE 70
(D) SAE 80

Q17. In the opposed piston diesel engine, the combustion chamber is located
(A) above the piston
(B) between the pistons
(C) any when
(D) there is no such criterion.

Q18. A stoichiometric air-fuel ratio is
(A) chemically correct mixture
(B) lean mixture
(C) rich mixture for idling
(D) rich mixture for over loads

Q19. In a naturally aspirated diesel engine, the air is supplied by
(A) a supercharger
(B) a centrifugal blower
(C) a vacuum chamber
(D) an injection tube

Q20. In loop scavenging, the top of the piston is
(A) flat
(B) contoured
(C) slanted
(D) depressed