Transformers Flashcards
What is the EMF generated in the secondary coil of a transformer called?
EMF of mutual induction
The action of generating this is called transformer action.
Will a transformer work with DC voltages?
NO
Why won’t DC voltages work on transformers?
No: Change in magnetic field
List two types of transformer construction.
- Shell
- Core
What are the two coils in a simple transformer called?
Primary, secondary
What should coils be wound on to achieve maximum transfer of coil windings?
Soft iron core
What is the turns ratio of a transformer with equal numbers of turns on primary and secondary?
1:1
What is the principal function of a transformer?
Step up or step down AC voltages
If the turns in the secondary winding are twice that of the primary, what type of transformer is this?
Step up transformer
If the turns in the secondary winding are half that of the primary, what type of transformer is this?
Step down transformer
State the output voltage equation of a transformer.
Output voltage = (turns in secondary / turns in primary) x input voltage
What is the purpose of the earthed centre tapped transformer?
To divide voltage by half reducing the shock affect
Do the basic principles for a single-phase transformer apply equally to three-phase transformers?
YES
How do we ensure a balanced load on each pair of phases?
Two wires line of output
What is the heritage colour coding of cables on HM Ships?
- L1: Red
- L2: Yellow
- L3: Blue
Identify the input cables on HM ships.
- L1: Red
- L2: Yellow
- L3: Blue
State the new to be introduced colour codes.
- L1: Brown
- L2: Black
- L3: Grey
