Ch 7 & 8

Question 1

Supplies a continuous source of AC to critical loads.

Answer 1

UPS

Question 2

Functions by converting AC to DC then back to AC

Answer 2

Function of UPS

Question 3

Why is it necessary for UPS to convert from AC to DC?

Answer 3

So batteries can be used to supply power to loads when normal power is lost.

Question 4

What is required if an AC induction motor speed is to be changed over a wide range?

Answer 4

Adjustable Speed Drive

Question 5

Motor speed is directly related to what?

Answer 5

Frequency and voltage

Question 6

Advantages of ASDs

Answer 6

Controlled acceleration/deceleration of motor

Speed varied continuously for efficiency

May start at a lower speed and also run continuously at lower speeds