Deck 6: The Control Transformer

Question 1

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

Answer 1

True

Question 2

How do you determine the rated current of a transformer?

Answer 2

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

Question 3

Control transformers are generally protected by fuses or ____________________.

Answer 3

circuit breakers

Question 4

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

Question 5

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

Question 6

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

Question 7

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

Question 8

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

Question 9

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

Question 10

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

Question 11

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

Question 12

Magnetic control systems generally operate on 240 volts.

Question 13

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

Question 14

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

Question 15

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.