Explain why carbon dioxide in the atmosphere is necessary for life on earth.
What will be an ideal response?
Carbon dioxide absorbs infrared radiation from the sun, preventing it from reradiating out of the earth's atmosphere and, thus, warming the atmosphere. This process is called the greenhouse effect.
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A customer complains that the heater works sometimes, but sometimes only cold air comes out while
driving. Technician A says that the water pump is defective. Technician B says that the cooling system could be low on coolant. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
Technician A says that the connecting rods should be marked before disassembly. Technician B says that pistons are cam ground so that when operating temperature is reached, the piston will have expanded enough across the piston pin area to become oval shaped. Who is right?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
A group of organs that function together to accomplish a larger, general function is called a system.
Answer the following statement true (T) or false (F)
Which of the following is NOT a type of plastic piping?
A. CSST B. PVC C. CPVC D. ABS