How does one detect a leak in a low-pressure system?
A) By full system shut-downs B) By an extended purging operation
C) By high pressure increases D) By slower recovery rates
B
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Answer the following statement(s) true (T) or false (F)
1. DC motors are still used in many industries. 2. Variable-frequency drives control motor speed by controlling the frequency of the power supplied to the motor. 3. IGBTs have an insulated gate different from all types of field effect transistors (FETs). 4. The magnet wire used in the construction of inverter rated motor windings has a lower rated insulation than other motors. 5. The primary purpose of a variable-frequency drive is to provide speed control for an AC motor.
The diac will remain turned on until the applied voltage drops below ____.
a. above its holding current b. below its holding current c. above its conduction level d. below its conduction level
Sketch the symbol for a square butt weld.
What will be an ideal response?
Typical secondary coil resistance specifications usually range from ________ ohms
A) 6,000-30,000 B) 1-3 C) 100-450 D) 500-1500