Todos los dispositivos sonoros de alarma residenciales tienen que tener un nivel nominal MÍNIMO de _____ a 10' (3,05 m).
a. 60 dB
b. 75 dB
c. 85 dB
d. 120 dB
c. 85 dB
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Answer the following statement(s) true (T) or false (F)
1. Pilot control devices are often employed to control the operation of a wound rotor induction motor. 2. The overload relay for a wound rotor motor contains two sets of contacts, both normally closed. 3. Four separate levers permit selection of the motor’s operating speed. 4. If the motor is operating and a lower speed is selected, it immediately decreases to the lower speed without time delay.
Technician A says that the gears in a planetary gear set are in constant mesh. Technician B says that a planetary gear set has a ring gear and hypoid gears. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
If the evaporator in a reach in freezer is coated with a large quantity of ice:
A) It operates more efficiently because the ice provides free cooling. B) It operates less efficiently because the ice acts as an insulation. C) The system's refrigerant level should be checked because the evaporator should not freeze up. D) The operation of the system is not affected because the coil is still below freezing.
List three disadvantages of a DMM
What will be an ideal response?