Chapter 11, Problem 48RQ

Three common controls used in central electric heat applications are thermostats, contactors (or relays), and A. capacitors. B. sequencers. C. cool anticipators.

What circuit is energized with the thermostat Y circuit?

A disadvantage of a central forced-air electric furnace is that A. there is no zone control for individual rooms. B. a thermostat must be installed in each room. C. only line-voltage thermostats can be used. D. it is difficult to add air-conditioning (cooling)

Where is the heat range code indicated on a spark plug?   the steel shell   on the porcelain insulator   on the terminal   on the electrode

Question1. If an air conditioning system has three independent zones, how many space thermostats will the system have? Question 2. A technician is traversing a duct and obtains the following 8 velocity: 500fpm, 400fpm, 375fpm,625fpm,275fpm,360fpm,450fpm,and 575fpm. What is the velocity value that can be used for the system calculations?

Which is not a method of low-ambient control on air-cooled equipment? A. Modulating TXV B. Fan-cycling controls C. Flooding a condenser D. Fan speed control Describe the devices in questions 10-13.

What two factors determine the amount of voltage produced by a thermocouple?

What is the principle of operation for most externally mounted overload protection devices?

where is th sensing bulb on a thermostatic expansion valve mounted?