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Lasko Lasko
wrote...
Posts: 544
Rep: 2 0
6 years ago
Types of control systems include:
 
  A) Pneumatic, hydraulic, and electro-mechanical.
  B) Line voltage, low voltage, and communicating.
  C) Voltage, current, and milliamp.
  D) Pneumatic, electromechanical, electronic, and DDC.



[Ques. 2] The speed of an AC induction motor is determined by:
 
  A) The number of poles and the frequency of the alternating current.
  B) The voltage applied to the armature.
  C) The number of turns in the motor winding.
  D) The voltage of the field windings.



[Ques. 3] What is the minimum current rating for the disconnect switch of a unit with a minimum circuit ampacity rating of 45 A?
 
  A) 45 A  1.25 = 56.25 A B) 45 A  1.15 = 51.75 A
  C) 45 A D) 45 A  1.5 = 67.5 A



[Ques. 4] 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 increase or decrease the output of a controlled device in proportion to the level of the measured condition.
  C) Proportional controls regulate the starting and stopping of the system to keep the run time ratio as low as possible.
  D) Proportional controls have the ability to measure the controlled variable and the system output and dynamically adjust the setpoint to achieve more precise control.



[Ques. 5] If aluminum power wire is used, to make a safe connection the installer should make sure:
 
  A) To first spray the lugs with insulating spray.
  B) To use an aluminum-tipped screwdriver to tighten the lugs.
  C) The aluminum wire is one size smaller than a comparable copper wire.
  D) That the furnace power connectors are rated for aluminum wire.
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Replies
wrote...
6 years ago
1)  D

2)  A

3)  B

4)  B

5)  D
Lasko Author
wrote...
6 years ago
What an awesome place to get free homework help
wrote...
6 years ago
What makes it awesome is that you posted, thanks for trusting us
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