Describe the basic operating principle of a fuel cell.
What will be an ideal response?
Fuel cells electrochemically combine oxygen from the air with hydrogen to produce electricity. The oxygen and hydrogen are fed to the fuel cell as "fuel" for the electrochemical reaction.
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Technician A says the gear reduction occurs when the drive gear turns faster than the driven gear. Technician B says that overdrive occurs when the driven gear turns faster than the drive gear. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
The difference between codes and standards is:
A) Codes apply only to city and county building regulations. B) Codes apply to local municipal laws, and standards apply to state laws. C) Codes are enforceable by law, and standards are not. D) Codes and standards apply to equipment that is sold on international markets.
When a power of 10 moves from the numerator to the denominator, the sign of the exponent changes
Indicate whether the statement is true or false
This is one of the most common systems for heating and air conditioning circulates the air from the living spaces through or around heating or cooling devices:
A. central forced-air system B. forced-air system C. circulating forced-air system D. central-air system E. all of the above