Machines

Question 1

How are eddy currents minimised in a practical transformer

Answer 1

Use a solid laminated core

Question 2

What fault is shown when the red/blue/yellow phase is faulty

Answer 2

Single phasing

Question 3

What will happen to a lightly loaded motor which develops a single phasing fault

Answer 3

It will continue to run but will not start if stopped

Question 4

If there is a fault on the red wire, what will happen to the value of its current

Answer 4

It will become an increased 1 phase current

Question 5

What is the main type of DC propulsion motor in the RN

Answer 5

A shunt motor

Question 6

What ROTOR is found in many AC motors

Answer 6

Squirrel cage rotor

Question 7

What type of motor would use a squirrel cage rotor

Answer 7

Three phase induction motor

Question 8

What materials are typically used for conducting parts of a squirrel cage rotor

Answer 8

Copper, aluminium or iron

Question 9

Why is a capacitor included in a single phase induction motor

Answer 9

To change the phase of the current in one of the windings