____ foams have the best R-value per inch.
a.Polystyrene
b.Polyurethane
c.Polyvinyl chloride
d.Polycarbonate
ANS: B
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____ measure atmospheric, climate, gas, hydraulic, and electric temperatures.
A. Pressure sensors B. Flow sensors C. Gas sensors D. Temperature sensors
Why is a potting media preferable to soil for growing plants in pots?
What will be an ideal response?
When troubleshooting an oil furnace, the technician notices that the oil burner fires and burns normally for 90 seconds, and then shuts down. What is the most likely problem?
A. defective limit switch B. defective oil burner fan motor C. defective room thermostat D. defective cad cell
The subsequent problems deal with the following PIC circuit, where the PORTB pins are attached directly up to the individual segments of a 7-segment LED display as shown. (Note - All seven segments "a"-"g" are wired as shown for segment "g," with a pull-up resistor to 5V.) Assume the PORTB pins are declared as outputs.
Which of the following statements would make a "2" appear on the LED display?
A. PORTB = %00000010 B. PORTB = %00010010 C. PORTB = %01000000 D. PORTB = %11101101 E. PORTB = %11111101