Deck 11: Exhaust Emissions and Control Systems in Vehicles

Question 1

CO in the exhaust of a car engine should not be more than:

A)0.5%
B)2%
C)5%
D)10%

Answer 1

0.5%

Question 2

The PCV (Positive Crankcase Ventilation) valve is located between the

A)Air cleaner and the carburetor
B)Carburetor and the intake manifold
C)Intake manifold and air cleaner
D)Intake manifold and crankcase

Answer 2

Intake manifold and crankcase

Question 3

In case of engines backfiring, the PCV valve:

A)Opens maximum
B)Closes
C)Disintegrates
D)Sticks in the centre position

Answer 3

Closes

Question 4

The position of the PCV valve plunger at idle speed is

A)Towards the valve outlet side
B)Towards the valve inlet side
C)Towards the crankcase
D)Near the valve centre

Question 5

The function of charcoal granules is to absorb:

A)Water vapour
B)Carbon monoxide
C)Petrol Vapour
D)Liquid petrol

Question 6

The liquid - vapour separator is located near the

A)Fuel tank
B)Carburettor
C)Charcoal canister
D)Purge valve

Question 7

EGR (Exhaust Gas Recirculation) system is employed for controlling emissions of:

A)HC
B)CO
C)NO_x
D)HC and CO

Question 8

The main purpose of the diverter valve in the air injection system is to

A)Close the check valve
B)Prevent back fire in the exhaust system
C)Prevent backfire in the inlet manifold
D)Weaken the air-fuel mixture

Question 9

The catalyst used in the reduction converter is

A)Copper
B)Charcoal
C)Rodium
D)Platinum

Question 10

The catalyst used in the converter for oxidizing HC and CO is

A)Copper
B)Charcoal
C)Rodium
D)Platinum

Question 11

In a three-way converter, the first converter controls

A)HC
B)CO
C)NO_x
D)All of these

Question 12

The air fuel ratio required for the efficient operation of a three approximately

A)5:1
B)10:1
C)15:1
D)20:1S

Question 13

Which stage of vehicle emission norms presently applicable in India in Internal Combustion Engine?

A)Bharat Stage V
B)Bharat Stage IV
C)Bharat Stage III
D)Bharat Stage II

Question 14

Which of the following is one of the major exhaust emissions from CI engines compared to SI engines?

A)oxides of nitrogen
B)Particulates
C)CO and CO₂
D)Unburnt hydrocarbon

Question 15

Which of the following causes the photochemical smog?

A)Excess O₂
B)CO and CO₂
C)Soot and particulate matter
D)NO_x and HC

Question 16

What does the blue smoke in diesel engine indicate?

A)Unburnt oil
B)HC
C)NO_x
D)CO

Question 17

During which condition of the vehicle does Noxemission in SI engine will be lowest?

A)Cruising
B)Idling
C)Accelerating
D)Decelerating

Question 18

For what purpose is the Rhodium used?

A)To reduce CO and HC
B)To reduce NO_x
C)To reduce CO
D)To reduce HC

Question 19

Why are lead compounds added in petrol?

A)Reduce knocking
B)Reduce HC emission
C)Reduce exhaust temperature
D)Increase power output