What is a toxic chemical? What is the difference between acute and chronic
toxicity?
What will be an ideal response?
A toxic chemical is one that is poisonous or injurious to humans and other animals.
Acute toxicity is a measure of how poisonous a pesticide is after a single exposure.
Pesticides are generally rated according to acute toxicity. Chronic toxicity is a measure of
how poisonous a pesticide is over a period of time and after repeated exposure. Chronic
toxicity is a danger of chemicals that accumulate in the body, such as chlorinated
hydrocarbons.
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Precision measuring instruments require which of the following care and handling for proper use?
a. Use your senses of sight and touch, which are critical for accurate and consistent measurements. b. Practice using precision measuring instruments to learn their proper feel. c. Never force or overadjust the tools when making measurements. d. All of the above are correct.
A one-family dwelling service disconnecting means must have a minimum rating of ____.
A. 120 amperes, 4-wire B. 100 amperes, 2-wire C. 100 amperes, 3-wire D. 120 amperes, 3-wire
The starter motor can produce up to ________ horsepower
A) 8 B) 20 C) 5 D) None of these
The refrigerant line whose sizing has the most effect on the compressor's compression ratio is the:
A) Discharge line. B) Liquid line. C) Suction line. D) Refrigerant line sizing has no effect on compression ratio.