What are proportional controls?
A) Proportional controls integrate the signals from several sensors and control the system operation based on the proportion of sensors requiring conditioning
B) Proportional controls have the ability to measure the controlled variable and the system output and dynamically adjust the setpoint to achieve more precise control
C) Proportional controls increase or decrease the output of a controlled device in proportion to the level of the measured condition
D) Proportional controls regulate the starting and stopping of the system to keep the run time ratio as low as possible
C
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Who sets shop capacity?
A. Service consultant B. Technicians C. Manager or owner D. Union representative
In designing the following residential buildings, should the architect refer to IBC or IRC: (a) a semi-detached 2-family dwelling, (b) a 3 -story townhouse, (c) a 3-story apartment building?
What will be an ideal response?
Air is compressed using an adiabatic quasi-equilibrium process from 100 kPa and 20°C to 800 kPa. The temperature T2 is nearest:
A) 260°C B) 280°C C) 300°C D) 320°C
How do infrared heaters transfer heat?
A) Air is circulated over them and distributed via ductwork B) They heat the air molecules and the air heats the people in the room C) They directly heat people and objects through rays D) They only heat objects that they are touching