×

# Transformer Practice Exam

###### Jump to latest post
Page 2 of 2 First 12
1. ## coefficient of coupling

A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is

A. 1.7 V
B. 0.85 V
C. 1 V
D. 0 V  Reply With Quote

2. ## secondary voltage?

The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?

A. 2 V
B. 20 V
C. 180 V
D. 18 V  Reply With Quote

3. ## primary winding

The primary winding of a power transformer should always be

A. open
B. shorted
C. switched
D. fused  Reply With Quote

When a 200 load resistor is connected across the secondary winding of a transformer with a turns ratio of 4, the source "sees" a reflective load of

A. 50
B. 12.5
C. 800
D. 0  Reply With Quote

5. ## secondary voltage

When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

A. 0 V
B. 6 V
C. 48 V
D. 0.75 V  Reply With Quote

6. ## total flux generated

What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?

A. 0.4
B. 4
C. 9.6
D. 0.96  Reply With Quote

A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 . The load resistance as seen by the source is

A. 1.3
B. 7.8
C. 78
D. 13  Reply With Quote

8. ## induced voltage

When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

A. increases
B. decreases
C. remains constant
D. reaches zero  Reply With Quote

9. ## flux density

For a given wirewound core, an increase in current through the coil

A. reverses the flux lines
B. decreases the flux density
C. increases the flux density
D. causes no change in flux density  Reply With Quote

10.  Junior Member Pro Subscriber
Join Date
Jun 2019
Posts
1
Reputation  Originally Posted by Vysakh9292 What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

A. 4 kVA
B. 0.25 kVA
C. 16 kVA
D. 8 kVA
8A multiplied by 2kV = 16kVA.  Reply With Quote

electrical calculations, electrical theory, neta exam questions, neta level 2, transformers  