Why should ultraviolet germicidal lamps not be handled with bare hands?
A) The coating on the outside of the lamps is toxic
B) The oil from your fingerprints can lead to premature failure of the lamp
C) The exterior UV coating will wipe off, reducing the UV output
D) The residual UV in the lamp coatings can cause severe burns
B
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A faulty A/C system has a high low-side pressure and a high high-side pressure. Technician A says that the system is probably starved. Technician B says that the system has a bad thermostatic switch. Who is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
What are the units of "efficacy"?
A) Foot-candles per inch. B) Lumens per hour. C) Candlepower per steradian. D) Lumens per watt.
A significant portion of the global production of methane comes from the activity of termites
Indicate whether the statement is true or false
An ignition coil is an example of a ________
A) Step-down transformer B) Relay C) Step-up transformer D) Solenoid