The best choice to control a small variable speed ac motor is an)
A) SCR.
B) PUT.
C) diac.
D) triac.
E) UJT.
Correct Answer:
Verified
Q30: The PUT Programmable Unijunction Transistor)is actually a
Q31: To avoid confusing the schematic symbols for
Q32: A silicon controlled rectifier has
A)two external leads.
B)three
Q33: The most likely device to be used
Q34: Each of the following has a gate
Q36: For a UJT, the intrinsic standoff ratio
Q37: The minimum current that keeps a latch
Q38: An SCR crowbar circuit is used to
A)control
Q39: SCRs are
A)bidirectional.
B)four- layer diodes.
C)high- current devices.
D)low- power
Q40: An SCR is usually turned on by
A)breakover.
B)holding
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