If the main gas valve of a standing pilot gas furnace is not energized and allowing gas to flow to the main burner, you should suspect that ________
A) the fan switch is open, the fan is faulty, or the filter may be dirty
B) the pilot flame is not established, the thermocouple is faulty, or the coil in the gas valve is open
C) the heat anticipator of the thermostat is set incorrectly
B
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The basic designs of AC compressors include ________, ________, and ________.
A) Piston, vane, and scroll B) Fixed scroll, moveable scroll, and piston C) Balanced, piston, and scroll D) Radial, piston, and vane
The flying fox is found in ____ with heavy vegetation
A) lakes B) creeks C) ponds D) rivers
At full-load torque, the motor speed is 580 rpm. A FWM converter drives the motor. Calculate the duty ratio that limits the dynamic braking current to twice the rated value.
A 60 Hz, 480 V, three-phase, Y-connected induction machine has the following
parameters:
The SCR is a member of a family of devices known as ____.
a. gates b. rectifiers c. thyristors d. PNPNs