Author Question: When installing electric furnaces, all aspects of the power wiring circuit are crucial because of: ... (Read 51 times)

corkyiscool3328 · **on:** Jul 24, 2018

When installing electric furnaces, all aspects of the power wiring circuit are crucial because of:

A) The sensitivity of the delicate electronic controls used to control electric heating elements.
B) The high current draw of electric furnaces.
C) The higher voltage that is supplied to electric furnaces.
D) The intolerance of electric heating elements to voltage variation.

Question 2

Direct digital controls (DDC) operate by:

A) Providing a modulating air pressure in response to monitored conditions.
B) Processing electronic signals with a microprocessor.
C) Providing a varying DC voltage in response to monitored conditions.
D) Turning relay coils on or off to complete circuits.