A.Switches
B.panels
C.alarm units
D.safety devices
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A.deteriorates
B.increases
C.are fouled
D.becomes better
A.varying the D-Cexciter voltage
B.varying the reluctance of the air gap
C.regulating the speed of prime mover
D.shorting out part of the armature windings
A.short circuit
B.speed up
C.slow down
D.hunting
A.live
B.dead
C.excited
D.on line
A.Feed back
B.Negative feed back
C.Close loop
D.Open loop
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