In through-beam sensors, ________
A) The light source and receiver are in separate housings
B) The light source and receiver are in the same housing
C) Targets must reflect the beam
D) A and C
A
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What fractional part of a quadrant is 40°?
What will be an ideal response?
In refrigeration and air conditioning, loads are normally wired:
A) Either in series or in parallel with each other. B) In series with each other. C) In parallel with each other. D) In parallel with the switches controlling them.
The term reluctance in magnetic circuits is like the term ________ in electrical circuits
A) current B) resistance C) capacitance D) voltage
How many Btus of heat are removed per hour when the water at a flow rate of 10 lbs. per minute is cooled 15°F? (Water weighs 8.33 lb. per gallon.)
What will be an ideal response?