One

Two

Three

More than three

(a) It can be done only for Multi-Cylinder IC engine

(b) It can be done on both petrol as well as diesel engines.

Both (A) and (B)

None of these

They are small butterfly valves fitted to the intake manifold just before the cylinder head intake ports of modern automative diesel engines.

They are small butterfly valves fitted to the intake manifold just before the cylinder head intake ports of modern automative petrol engines.

They are small fuel injectors fitted to the intake manifold just before the cylinder head intake ports of modern steam engines.

None of these

Additional Oxygen cylinder

Supercharger

Extra cam on the intake valve

None of these

15

42.5

85

None of these