1. Polymerization is a chemical process in which molecules of a compound become ___________
a) larger
b) smaller
c) liquid
d) gaseous
Explanation: Polymerization is defined as a chemical process in which molecules of a compound become larger.
2. Diesel fuel, compared to petrol is ___________
a) less difficult to ignite
b) just about the same difficult to ignite
c) more difficult to ignite
d) none of the mentioned
Explanation: more difficult to ignite
3. In a diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of ___________
a) 250ºC
b) 500ºC
c) 1000ºC
d) 1500ºC
Explanation: 1000ºC
4. When crude oil is heated, then which of the following hydrocarbon is given off first?
a) kerosene
b) gasoline
c) paraffin
d) natural gas
Explanation: When crude oil is heated, then natural gas is given off first.
5. Gaseous fuel guarantees are based on ___________
a) calorific value of oil
b) low heat value of oil
c) mean heat value of oil
d) none of the mentioned
Explanation: low heat value of oil
6. The rating of a diesel engine, with an increase in air inlet temperature, will ___________
a) increase linearly
b) decrease linearly
c) increase parabolically
d) decrease parabolically
Explanation: The rating of a diesel engine, with an increase in air inlet temperature, will decrease linearly
7. 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
Explanation: instantaneous and rapid burning of the first part of the charge
8. What is volatility of diesel fuel?
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
Explanation: indicated by 90% distillation temperature
9. 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
Explanation: detonation
10. What is Auto-ignition temperature?
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
Explanation: Auto-ignition temperature is defined as that temperature at which it catches fire without external aid while volatility of diesel fuel is indicated by 90% distillation temperature.