Chapter 135

Question 0

In severely cold weather, what adjustment must be made to properly preheat the outside air?
A) the temperature controller’s throttling range must be increased
B) the outdoor damper should be closed
C) two separate preheater coils should be installed
D) damper must be heated
E) preheat coil temperature should be increased

Answer 0

C) two separate preheater coils should be installed

Question 1

To provide a two position damper equipped with a fan that provides 100% outdoor air with a ratio of damper opening, what is required?

Answer 1

Gradual switch

Question 2

Air conditioning with respect to heating coils is achieved in which of the following ways?
A) a combination of tempering control functions
B) the selected mixing of warm return air and cooler outside air
C) selective heating by passing air through the heating coils
D) proportioning the amount of air flow through the face damper for heat addition, or through the bypass dampers for no heat addition
E) all of the above

Answer 2

E) all of the above

Question 3

To prevent too frequent starting and stopping of the compressor in a cooling system, what should be done?

Answer 3

Run the compressor continuously and modulate the refrigerant flow

Question 4

To control static pressure in the air ducts, a differential pressure controller is installed. How does the controller control static pressure?
A) adjust fan speed
B) modulating discharge dampers
C) modulating fan inlet dampers

Answer 4

C) modulating fan inlet dampers