IE Engines ModelOnline Quiz Questions Test2

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1. Which of the following is the lightest and most volatile liquid fuel
diesel	kerosene
fuel oil	gasoline

2. The theoretically correct air fuel ratio for petrol engine is of the order of _____.
6 : 1	9 : 1
12 : 1	15 : 1

3. Air fuel ratio for idling speed of a petrol engine is approximately
1 : 1	5 : 1
10 : 1	15 : 1

4. Air fuel ratio at which a petrol engine can not work is _____.
8 : 1	10 : 1
15 : 1	20 : 1 and less

5. For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of _____.
9 : 1	12 : 1
15 : 1	18 : 1

6. The following volume of air is required for consuming 1 litre of fuel by a four stroke engine
1 m3	5 m3
5-6 m3	9-10 m3

7. Pour point of fuel oil is the _______.
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	temperature at which it solidifies or congeals
it catches fire without external aid	indicated by 90% distillation tempera-ture i.e., when 90% of sample oil has distilled off

8. A 5 BHP engine running at full load would consume diesel of the order of ______.
0.3 kg/hr	1 kg/hr
3 kg/hr	5 kg/hr

9. 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
it is properly designed	best quality fuel is used
can not work as it is impossible	flywheel size is proper

10. A diesel engine has _____.
1 valve	2 valves
3 valves	4 valves

11. A hmh flame speed is obtained in diesel engine when air fuel ratio is
uniform throughout the mixture	chemically correct mixture
about 3-5% rich mixture	about 10% rich mixture

12. The knock in diesel engine occurs due to
instantaneous and rapid burning of the first part of the charge	instantaneous atuo iginition of last part of charge
delayed burning of the first part of the charge	reduction of delay period

13. The air-fuel ratio in petrol engines-is controlled by _____.
controlling valve opening/closing	governing
injection	carburettion

14. Volatility of diesel fuel oil is ______.
minimum temperature to which oil is heated in order to give off inflam¬mable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame	temperature at which it solidifies or congeals
it catches fire without external aid	indicated by 90% distillation tempera-ture, i.e., when 90% of sample oil has distilled off

15. Which is more viscous lub oil
SEA 30	SAE 40
SAE 50	SAE 80

16. In the opposed piston diesel engine, the combustion chamber is located
above the piston	below the piston
between the pistons	any when

17. A stoichiometric air-fuel ratio is _____.
chemically correct mixture	lean mixture
rich mixture for idling	rich mixture for over loads

18. In a naturally aspirated diesel engine, the air is supplied by
a supercharger	a centrifugal blower
a vacuum chamber	an injection tube

19. In loop scavenging, the top of the piston is
flat	contoured
slanted	depressed

20. In the crankcase method of scavenging, the air pressure is produced by
supercharger	centrifugal pump
natural aspirator	movement of engine piston