What is first charge and end charge in si ciengines?
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Answers – Qualities of Fuel
This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Qualities Of Fuel”.
1. The rating of a diesel engine, with increase in air inlet temperature, will
a) increase linearly
b) decrease linearly
c) increase parabolically
d) decrease parabolically
View Answer
2. The knock in diesel engine occurs due to
a) instantaneous and rapid burning of the first part of the charge
b) instantaneous auto ignition of last part of charge
c) reduction of delay period
d) none of the mentioned
View Answer
3. Volatility of diesel fuel is
a) maximum temperature to which oil is heated in order to give off inflammable vapour in sufficient quantity to ignite momentarily when bought in contact with a flame
b) it catches fire without external aid
c) indicated by 90% distillation temperature
d) none of the mentioned
View Answer
4. Violent sound pulsations within the cylinder of an I.C. engine are caused due to
a) heavy turbulence
b) improved scavenging
c) detonation
d) pre-ignition
View Answer
5. Auto-ignition temperature is
a) maximum temperature to which oil is heated in order to give off inflammable vapour in sufficient quantity to ignite momentarily when bought in contact with a flame
b) that at which it catches fire without external aid
c) indicated by 90% distillation temperature
d) none of the mentioned
View Answer
6. Ignition lag is
a) the time taken by fuel after injection to reach upto auto-ignition temperature
b) time before actual fuel injection and the pump plinger starts to pump fuel
c) time corresponding to actual injection and top dead center
d) none of the mentioned
View Answer
7. The delay period in petrol engine is of the order of
a) 0.001 sec
b) 0.002 sec
c) 0.01 sec
d) 0.1 sec
View Answer
8. Detonation is caused by the following unstable compounds
a) peroxides, aldehydes and ketones
b) peroxides, aldehydes, oxides and sulphides
c) aldehydes, oxides and ketones
d) none of the mentioned
View Answer
9. In order to prevent knock in the S.I. engines, the charge away from the spark plug should have
a) low temperature
b) low density
c) rich mixture
d) all of the mentioned
View Answer
10. To reduce the possibility of knock in C.I. engines, the first elements of fuel and air should have
a) high temperature
b) high density
c) short delay
d) all of the mentioned
View Answer
11. The detonation tendency in petrol engines for specified conditions of fuel rating, compression ratio, speed etc, can be controlled by having
a) smaller cylinder bore
b) bigger cylinder bore
c) medium cylinder bore
d) none of the mentioned
View Answer
12. A fuel will detonate less if it has
a) higher self ignition temperature
b) lower self ignition temperature
c) proper self ignition temperature
d) none of the mentioned
View Answer
13. Ignition quality of diesel fuel oil is expressed by an index called
a) octane number
b) cetane number
c) calorific value
d) none of the mentioned
PLEASE set in BRAINLIEST ANSWER
This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Qualities Of Fuel”.
1. The rating of a diesel engine, with increase in air inlet temperature, will
a) increase linearly
b) decrease linearly
c) increase parabolically
d) decrease parabolically
View Answer
2. The knock in diesel engine occurs due to
a) instantaneous and rapid burning of the first part of the charge
b) instantaneous auto ignition of last part of charge
c) reduction of delay period
d) none of the mentioned
View Answer
3. Volatility of diesel fuel is
a) maximum temperature to which oil is heated in order to give off inflammable vapour in sufficient quantity to ignite momentarily when bought in contact with a flame
b) it catches fire without external aid
c) indicated by 90% distillation temperature
d) none of the mentioned
View Answer
4. Violent sound pulsations within the cylinder of an I.C. engine are caused due to
a) heavy turbulence
b) improved scavenging
c) detonation
d) pre-ignition
View Answer
5. Auto-ignition temperature is
a) maximum temperature to which oil is heated in order to give off inflammable vapour in sufficient quantity to ignite momentarily when bought in contact with a flame
b) that at which it catches fire without external aid
c) indicated by 90% distillation temperature
d) none of the mentioned
View Answer
6. Ignition lag is
a) the time taken by fuel after injection to reach upto auto-ignition temperature
b) time before actual fuel injection and the pump plinger starts to pump fuel
c) time corresponding to actual injection and top dead center
d) none of the mentioned
View Answer
7. The delay period in petrol engine is of the order of
a) 0.001 sec
b) 0.002 sec
c) 0.01 sec
d) 0.1 sec
View Answer
8. Detonation is caused by the following unstable compounds
a) peroxides, aldehydes and ketones
b) peroxides, aldehydes, oxides and sulphides
c) aldehydes, oxides and ketones
d) none of the mentioned
View Answer
9. In order to prevent knock in the S.I. engines, the charge away from the spark plug should have
a) low temperature
b) low density
c) rich mixture
d) all of the mentioned
View Answer
10. To reduce the possibility of knock in C.I. engines, the first elements of fuel and air should have
a) high temperature
b) high density
c) short delay
d) all of the mentioned
View Answer
11. The detonation tendency in petrol engines for specified conditions of fuel rating, compression ratio, speed etc, can be controlled by having
a) smaller cylinder bore
b) bigger cylinder bore
c) medium cylinder bore
d) none of the mentioned
View Answer
12. A fuel will detonate less if it has
a) higher self ignition temperature
b) lower self ignition temperature
c) proper self ignition temperature
d) none of the mentioned
View Answer
13. Ignition quality of diesel fuel oil is expressed by an index called
a) octane number
b) cetane number
c) calorific value
d) none of the mentioned
PLEASE set in BRAINLIEST ANSWER
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