Deck 6: The Control Transformer

Question 1

How do you determine the rated current of a transformer?

Answer 1

To determine the rated current of the transformer, divide the volt-ampere rating of the transformer by the primary voltage.

Question 2

Why is it that the secondary fuse size can be set at a lower percentage of the rated current?

Answer 2

The secondary fuse size can be set at a lower percentage of the rated current because the secondary does not experience the high in-rush current of the primary.

Question 3

Control transformers generally have screw terminals connected to the primary and secondary leads.

Answer 3

True

Question 4

There is a turns ratio of ____________________ between each primary winding and the secondary winding.

Question 5

How is voltage tested if one side of the control transformer is grounded?

Question 6

Control transformers are generally protected by fuses or ____________________.

Question 7

High impedance voltmeters can indicate some amount of voltage caused by the capacitance of the ground and induced voltage produced by surrounding magnetic fields. These are generally referred to as ____________________ voltages.

Question 8

Many industries prefer to ground the control system and it is a very common practice.

Question 9

What is the voltage on which most magnetic control systems operate?

Question 10

When one side of the secondary winding of a control transformer is grounded, the control system is referred to as a(n) ____________________ system.

Question 11

Most control transformers are made with one primary winding and two secondary windings.

Question 12

Magnetic control systems generally operate on 240 volts.

Question 13

When one side of the control transformer is not grounded, it is generally referred to as a(n) ____________________ system.

Question 14

Protection can be placed on the primary or secondary side of the control transformer.

Question 15

How is accurate voltage measurement made in a float control system?