Question 1

The relationship for the current ration (Isec/Ipri) in a transformer is:

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 2

-In Figure 14-1, the primary to secondary turns ratio is changed to 2.5:1 and the secondary current equals 100 mA. What is the reflected resistance seen by the primary?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 3

-What is the secondary current in Figure 14-1 with a   load resistor and 3:1 turns ratio?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 4

-What is the secondary voltage in Figure 14-1 if the turns ratio is 9:1?

Accepted Answer

A) 26.6 V 
B) 106 V 
C) 13.3 V 
D) 53.2 V 
A) 26.6 V 
B) 106 V 
C) 13.3 V 
D) 53.2 V

Question 5

The turns ratio of a transformer (n) is defined as:

Accepted Answer

A) the number of turns in the secondary divided by the number of turns in the primary. 
B) the number of turns in the primary divided by the number of turns in the secondary. 
C) the number of turns in the primary multiplied by the number of turns in the secondary. 
D) the number of turns in the secondary multiplied by the number of turns in the primary. 
A) the number of turns in the secondary divided by the number of turns in the primary. 
B) the number of turns in the primary divided by the number of turns in the secondary. 
C) the number of turns in the primary multiplied by the number of turns in the secondary. 
D) the number of turns in the secondary multiplied by the number of turns in the primary.

Question 6

What is the likeliest way to fix a center-tapped transformer which outputs unequal voltages on each half of the secondary?

Accepted Answer

A) Replace the transformer. 
B) Remove some turns from the half with the higher voltage winding. 
C) Add some turns to the half with the lower voltage winding. 
D) Do not concern yourself; the customer will probably not notice the problem. 
A) Replace the transformer. 
B) Remove some turns from the half with the higher voltage winding. 
C) Add some turns to the half with the lower voltage winding. 
D) Do not concern yourself; the customer will probably not notice the problem.

Question 7

For a transformer to operate properly, it must:

Accepted Answer

A) be supplied with the proper AC signal. 
B) work within its voltage, current and power ratings. 
C) be connected to a load. 
D) all of these. 
A) be supplied with the proper AC signal. 
B) work within its voltage, current and power ratings. 
C) be connected to a load. 
D) all of these.

The relationship for the current ration (Isec/Ipri) in a transformer is:

-In Figure 14-1, the primary to secondary turns ratio is changed to 2.5:1 and the secondary current equals 100 mA. What is the reflected resistance seen by the primary?

-What is the secondary current in Figure 14-1 with a load resistor and 3:1 turns ratio?

-What is the secondary voltage in Figure 14-1 if the turns ratio is 9:1?

The turns ratio of a transformer (n) is defined as:

What is the likeliest way to fix a center-tapped transformer which outputs unequal voltages on each half of the secondary?

For a transformer to operate properly, it must:

Quantities and Units

Voltage, Current, and Resistance

Ohms Law

Energy and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Circuit Theorems and Conversions

Branch, Loop, and Node Analyses

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Capacitors

Inductors

RC Circuits

RL Circuits

RlC Circuits and Resonance

Passive Filters

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters

Exam 14: Transformers

The relationship for the current ration (Isec/Ipri) in a transformer is:

-In Figure 14-1, the primary to secondary turns ratio is changed to 2.5:1 and the secondary current equals 100 mA. What is the reflected resistance seen by the primary?

-What is the secondary current in Figure 14-1 with a load resistor and 3:1 turns ratio?

-What is the secondary voltage in Figure 14-1 if the turns ratio is 9:1?

The turns ratio of a transformer (n) is defined as:

What is the likeliest way to fix a center-tapped transformer which outputs unequal voltages on each half of the secondary?

For a transformer to operate properly, it must:

Quantities and Units

Voltage, Current, and Resistance

Ohms Law

Energy and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Circuit Theorems and Conversions

Branch, Loop, and Node Analyses

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Capacitors

Inductors

RC Circuits

RL Circuits

RlC Circuits and Resonance

Passive Filters

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters