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Which one is nature's cleaner?
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When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as ________ double cover butt joint.
When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as _______ double cover butt joint.
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
The air-fuel ratio in petrol engines is controlled by
In spark ignition petrol engines maximum emission of Nox takes place when the air fuel ratio (A/F) is
The object of providing masked inlet valve in the air passage of compression ignition engines is to
Of the 65 cars on a car lot, 45 have air conditioning, 30 have power windows, and 12 have both air conditioning and power windows. how many of the cars on the lot have neither air conditioning nor power windows?