How do primary resistance starters work when connected to a wound rotor induction motor?
What will be an ideal response?
The milling machines are equipped with primary resistance starters. For this type of starter or controller, the heavy starting current results in a voltage drop while it passes through the primary resistors; thus, there is a lower voltage value at the motor terminals. The motor accelerates gently with less torque than is the case when line starters are used. When the motor has almost reached its normal speed, a time-delay relay (set for about 5 seconds) closes a second contactor to short out the primary resistors. At this point, the motor receives the full line voltage and accelerates to its normal speed.
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Answer the following statement true (T) or false (F)
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Fill in the blank(s) with the appropriate word(s).
The two types of reactions of photosynthesis are ____________________ and _________________________ reactions
Fill in the blank(s) with correct word
A resistance array is connected to a load resistor R and a 9-V battery as shown in Fig. 4.151.
(a) Find the value of R such that V? = 1.8 V.
(b) Calculate the value of R that will draw the maximum current. What is the maximum current?
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