Transformer

1/ How many main parts does the transformer have?

• 1

• 2

• 3

• 4

2/ The number of turns of wire on the secondary coil ?

• N1

• N2

• N0

• None of the above

3/ Transformer wire is made of ..... or ...... wire ?

• Copper, aluminum

• Iron, Zinc

• Tin, lead

• Steel, Tungsten

4/ Ratio K equals primary electromotive force over by secondary electromotive force equals the number of turns on the primary coil over by the number of turns on the secondary coil ?

• K=E1/N1=E2/N2

• K=U1/N1=U2/N2

• K=E1/E2=N1/N2

• K=N1/N2=E1/E2

5/ Working principle of transformer is based on ...... induction ?

• Electromagnetic

• Magnetic

• Electronical

• Ferromagnetic

6/ Step-down transformer ?

• U1>U2

• U1<U2

• U1=U2

• None of the above

7/ Rated power (rated capacity) 3-phase transformer ?

• 
• 
• 
• 

8/ Rated primary wire current 1 phase transformer ?

• 
• 
• 
• 

9/ How many three-phase transformer connection types ?

• 1

• 2

• 3

• 4

10/ Transformer windings can be connected in ... ?

• Star shape (symbol ''Y'')

• Triangle shape (symbol '' triangle '' or ''D'')

• circle shape

  (symbol "0" )

• Star shape (symbol ''Y'') and Triangle shape (symbol '' triangle '' or ''D'')