Answer to Question #202406 in Mechanical Engineering for Paul Hackman

Question #202406

1.How will you apply a chemical that needs to be ingested by immobile insects?

A. Spray the chemical below the canopy

B.Apply the chemical so that it completely covers the plant

C. Apply the chemical on same parts of the plant

D. Apply the chemical on the stem of the plant

E.Spray the chemical in the air

2. One of the following is not true of internal combustion engine.

A.More mechanical simplicity and lower weight / power ratio

B. it could be started and stopped in a a short time

C. Its thermal efficiency is higher than other heat engines

D.Its initial cost is high

E. It does not need auxiliary equipment, such as boiler and condenser

Expert's answer

Question 1

B) Apply the chemical so that it completely covers the plant

This is because over a period of one to three weeks, adult women place their eggs behind their protective covers. From this cover, the freshly hacked nymphs (called crawlers) travel about the plant until a suitable feeding place is identified. Young nymphs implant and start feeding their piercing mouthpieces and progressively build their own armor as they become immobile adults. which cover the plant completely.

Question 2

D.)Its initial cost is high

These engines may be obtained for just $250/kW as standby generators. These engines are inexpensive, such that they are suitable for applications that only seldom run.

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