When an animal is genetically programmed to respond to either an increase or decrease in daylength, it is called ____________________
Fill in the blank(s) with correct word
photoperiodism
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Answer the following statement(s) true (T) or false (F)
1. Two sets of momentary contacts are usually provided with push buttons. 2. Some double-break contacts are made of gold. 3. In most push buttons, copper-to-silver contact surfaces are provided for better electrical conductivity and longer life. 4. The amount of current broken by a push button is usually small. 5. Standard control station enclosures may be used in situations requiring submersible protection.
Type AC cable must have a bending radius at least ____ times the diameter of the cable.
A. two B. three C. five D. ten
PTAC and window unit air conditioners often use rotary compressors, which are effective but susceptible to failure due to high head pressure. What is the most common cause of high head pressure in these units?
A) Metering device failure B) Dirty evaporator C) Dirty condenser D) Incorrect charge
What is the temperature rise of a furnace with a supply air temperature of 130°F and a return air temperature of 75°F, operating in an ambient temperature of 50°F?
A) 75°F - 50°F = 25°F temperature rise B) 50°F + 75°F = 125°F temperature rise C) 130°F - 75°F = 55°F temperature rise D) 130°F - 50°F = 80°F temperature rise