Transformers

When measuring voltage and current which statement is true?

• Voltmeter and Ammeter in series

• Voltmeter and ammeter in parallel

• Voltmeter in series and ammeter in parallel

• Voltmeter in parallel and ammeter in series

What does SELV stand for?

How many windings does a double wound transformer have?

• 1

• 2

• 3

• 4

What type of transformer has more windings on the primary side than the secondary side?

• Step-down transformer
• Step-up transformer
• Isolation transformer
• Autotransformer

What type of transformer has one winding?

What losses occur in a transformer (pick three)

• Iron Losses

• Copper losses

• Stray Losses

• Magnetic losses

If Np=20, Ns=1 and Vp=240 what is Vs?

• 12

• 120

• 0.12

• 1.2

If Np=30, Ns=2, Ip=15A what is Is?

• 45A
• 60A
• 75A
• 225A

If Np=5, Ns=20, Vs=400V what is Vp?

• 100V
• 300V
• 50V
• 200V

If Np=50, Ns=250, Is=50A what is Ip?

• 200 A
• 100 A
• 150 A
• 250 A