Question 1

In SI engines flame speed increases

Accepted Answer

A) with turbulence 
B) with fuel-air ratio 
C) both (a) and (b) 
D) none of the above 
A) with turbulence 
B) with fuel-air ratio 
C) both (a) and (b) 
D) none of the above C

Question 2

Vacuum advance mechanism shifts the ignition point under

Accepted Answer

A) no load operation 
B) full load operation 
C) part load operation 
D) under sudden acceleration 
A) no load operation 
B) full load operation 
C) part load operation 
D) under sudden acceleration C

Question 3

Cooling after compression is necessary to

Accepted Answer

A) increase the density of air 
B) reduce engine operating temperatures 
C) both (a) and (b) 
D) increase exhaust temperature 
A) increase the density of air 
B) reduce engine operating temperatures 
C) both (a) and (b) 
D) increase exhaust temperature C

Question 4

Which of the following statement is wrong?

Accepted Answer

A) retarded timing causes exhaust gas temperature to be higher 
B) retarded timing improves fuel economy 
C) retarded timing requires slightly longer throttle opening 
D) retarded timing causes burning of the hydrocarbons in the exhaust 
A) retarded timing causes exhaust gas temperature to be higher 
B) retarded timing improves fuel economy 
C) retarded timing requires slightly longer throttle opening 
D) retarded timing causes burning of the hydrocarbons in the exhaust

Question 5

Pick up the false statement

Accepted Answer

A) Thermal efficiency of diesel engine i about 34% 
B) Theoretically correct mixture of air am petrol is approximately 15 : 1 
C) High speed compression engines operate on dual combustion cycle 
D) S.I. engines are quality-governed engines. 
A) Thermal efficiency of diesel engine i about 34% 
B) Theoretically correct mixture of air am petrol is approximately 15 : 1 
C) High speed compression engines operate on dual combustion cycle 
D) S.I. engines are quality-governed engines.

Question 6

The output of a diesel engine can be increased without increasing the engine revolution or size in following way

Accepted Answer

A) feeding more fuel 
B) increasing flywheel size 
C) heating incoming air 
D) supercharging. 
A) feeding more fuel 
B) increasing flywheel size 
C) heating incoming air 
D) supercharging.

Question 7

Battery ignition system

Accepted Answer

A) occupies more space 
B) has more maintenance problem 
C) is commonly employed in four wheelers 
D) all of the above 
A) occupies more space 
B) has more maintenance problem 
C) is commonly employed in four wheelers 
D) all of the above

Question 8

Supercharging is the process of

Accepted Answer

A) supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere 
B) providing forced cooling air 
C) injecting excess fuel for raising more load 
D) supplying compressed air to remove combustion products fully 
A) supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere 
B) providing forced cooling air 
C) injecting excess fuel for raising more load 
D) supplying compressed air to remove combustion products fully

Question 9

Types of supercharger are

Accepted Answer

A) reciprocating type 
B) gear type 
C) centrifugal type 
D) none of the above 
A) reciprocating type 
B) gear type 
C) centrifugal type 
D) none of the above

Question 10

Ignition timing is adjusted by

Accepted Answer

A) tachometer 
B) stroboscopic light 
C) stop watch 
D) accurate clock 
A) tachometer 
B) stroboscopic light 
C) stop watch 
D) accurate clock

Question 11

Method of governing used in petrol engine is

Accepted Answer

A) hit and miss governing. 
B) quality governing 
C) quantity governing 
D) none of above 
A) hit and miss governing. 
B) quality governing 
C) quantity governing 
D) none of above

Question 12

Supercharging is normally done in

Accepted Answer

A) racing cars 
B) marine engines 
C) automotive diesel engines 
D) none of the above 
A) racing cars 
B) marine engines 
C) automotive diesel engines 
D) none of the above

Question 13

Supercharging air compressor is driven by

Accepted Answer

A) exhaust gas turbine 
B) engine itself 
C) separate electrical motor 
D) none of the above 
A) exhaust gas turbine 
B) engine itself 
C) separate electrical motor 
D) none of the above

Question 14

In SI engines maximum flame speed is obtained when the equivalent ratio is between

Accepted Answer

A) 1.1 and 1.2 
B) 1.0 and 1.1 
C) 1.2 and 1.3 
D) less than 1 
A) 1.1 and 1.2 
B) 1.0 and 1.1 
C) 1.2 and 1.3 
D) less than 1

Question 15

The operation of forcing additional air under pressure in the engine cylinder is known as

Accepted Answer

A) scavenging 
B) turbulence 
C) supercharging 
D) pre-ignition 
A) scavenging 
B) turbulence 
C) supercharging 
D) pre-ignition

Question 16

The centrifugal type supercharger is preferable only for

Accepted Answer

A) low speeds 
B) high speeds 
C) high pressures 
D) none of the above 
A) low speeds 
B) high speeds 
C) high pressures 
D) none of the above

Question 17

Volumetric efficiency of supercharged engine is

Accepted Answer

A) between 100 - 110% 
B) between 90 - 100% 
C) between 80 - 90% 
D) between 70 - 80% 
A) between 100 - 110% 
B) between 90 - 100% 
C) between 80 - 90% 
D) between 70 - 80%

Question 18

The advantage of Root's supercharger is

Accepted Answer

A) big pressure 
B) minimum maintenance 
C) consumes less power 
D) occupies less space 
A) big pressure 
B) minimum maintenance 
C) consumes less power 
D) occupies less space

Question 19

The reason for supercharging in any engine is to

Accepted Answer

A) increase efficiency 
B) increase power 
C) reduce weight and bulk for a given out-put 
D) effect fuel economy 
A) increase efficiency 
B) increase power 
C) reduce weight and bulk for a given out-put 
D) effect fuel economy

Question 20

For the same power developed in I.C. engines, the cheaper system is

Accepted Answer

A) naturally aspirated 
B) supercharged 
C) centrifugal pump 
D) turbo charger 
A) naturally aspirated 
B) supercharged 
C) centrifugal pump 
D) turbo charger

In SI engines flame speed increases

Vacuum advance mechanism shifts the ignition point under

Cooling after compression is necessary to

Which of the following statement is wrong?

Pick up the false statement

The output of a diesel engine can be increased without increasing the engine revolution or size in following way

Battery ignition system

Supercharging is the process of

Types of supercharger are

Ignition timing is adjusted by

Method of governing used in petrol engine is

Supercharging is normally done in

Supercharging air compressor is driven by

In SI engines maximum flame speed is obtained when the equivalent ratio is between

The operation of forcing additional air under pressure in the engine cylinder is known as

The centrifugal type supercharger is preferable only for

Volumetric efficiency of supercharged engine is

The advantage of Root's supercharger is

The reason for supercharging in any engine is to

For the same power developed in I.C. engines, the cheaper system is

Internal Combustion Engines and Their Advantages and Disadvantages

Diesel Engines and Thermodynamic Cycles

Combustion and Efficiency in Engines

Fuel and Hydrocarbon

Automobile Engine Fuel Systems

Fuel Injection and Ignition Systems in Automotive Engineering

Combustion and Engine Performance in IC Engines

Automotive Engine Lubrication and Cooling System

Engine Cooling, Efficiency, and Emissions

Exhaust Emissions and Control Systems in Vehicles

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Exam 7: Supercharging and Ignition Timing in Engines

In SI engines flame speed increases

Vacuum advance mechanism shifts the ignition point under

Cooling after compression is necessary to

Which of the following statement is wrong?

Pick up the false statement

The output of a diesel engine can be increased without increasing the engine revolution or size in following way

Battery ignition system

Supercharging is the process of

Types of supercharger are

Ignition timing is adjusted by

Method of governing used in petrol engine is

Supercharging is normally done in

Supercharging air compressor is driven by

In SI engines maximum flame speed is obtained when the equivalent ratio is between

The operation of forcing additional air under pressure in the engine cylinder is known as

The centrifugal type supercharger is preferable only for

Volumetric efficiency of supercharged engine is

The advantage of Root's supercharger is

The reason for supercharging in any engine is to

For the same power developed in I.C. engines, the cheaper system is

Internal Combustion Engines and Their Advantages and Disadvantages

Diesel Engines and Thermodynamic Cycles

Combustion and Efficiency in Engines

Fuel and Hydrocarbon

Automobile Engine Fuel Systems

Fuel Injection and Ignition Systems in Automotive Engineering

Combustion and Engine Performance in IC Engines

Automotive Engine Lubrication and Cooling System

Engine Cooling, Efficiency, and Emissions

Exhaust Emissions and Control Systems in Vehicles

Filters