HEAT AND WORK (HEAT ENGINE)

1. A heat engine converts heat energy from fuel combustion or any other source into which type of work?

• a) Electrical work

• b) Mechanical work

• c) Pressure work

• d) None of the mentioned

A very important component of heat engines, is that two temperatures are involved. Arrange the following in their proper sequence of a full cycle of heat engine. I. Some of the energy from that input heat is used to do work (W). II. Head is added. It is an input heat which is relatively high in temperature. III. The rest of the heat is removed at a relatively cold temperature.

• a. I, II, III

• b. III,II,I

• c. II, I, III

• d. I, III, II

There are four cycle stroke in a gasoline engine. Which of the following cycle-stroke by which the inlet valve opens, the piston moves down as the fuel-air mixture fills in the cylinder?

• a. intake stroke

• b. compression stroke

• c. power stroke

• d. exhaust stroke

A practical engine is operated through cycles: the piston has to move back

and forth. When the gas has heated, the piston __________. When it is cooled, the

piston moves ___________.

• a. downward, downward

• b. moves up, moves up

• c. downward, moves up

• d. moves up, downward

In a four-cycle stroke of a gasoline engine, which of the following illustrates a power cycle?

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