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Electrical Engineering
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Transformers
Comments
Question
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?
Options
A. 0.4
B. 4
C. 9.6
D. 0.96
Correct Answer
0.96
Transformers problems
Search Results
1. When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is
Options
A. 12 V
B. 120 V
C. 240 V
D. 2,400 V
Show Answer
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Discuss
Correct Answer: 240 V
2. A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is
Options
A. 1.3 Ω
B. 7.8 Ω
C. 78 Ω
D. 13 Ω
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Correct Answer: 13 Ω
3. When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is
Options
A. 0 V
B. 6 V
C. 48 V
D. 0.75 V
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Discuss
Correct Answer: 0 V
4. If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is
Options
A. 25 W
B. 0 W
C. 250 W
D. 2.5 W
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Correct Answer: 25 W
5. A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance,
R
L
, is 120 Ω. What is the approximate voltage across the load?
Options
A. 7.3 V
B. 73 V
C. 88 V
D. 880 V
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Correct Answer: 7.3 V
6. In a parallel
RL
circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is
Options
A. 6 A
B. 424 mA
C. 4.24 A
D. 42.4 A
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Correct Answer: 4.24 A
7. Referring to Problem 23, the reactive power is
Options
A. 10 mVAR
B. 100 mVAR
C. 6.76 mVAR
D. 148 mVAR
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Correct Answer: 100 mVAR
8. When the frequency is decreased, the impedance of a parallel
RL
circuit
Options
A. increases
B. decreases
C. remains constant
D. is not a factor
Show Answer
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Correct Answer: decreases
9. To increase the current in a series
RL
circuit, the frequency
Options
A. should be increased
B. should be decreased
C. should be constant
D. cannot be determined without values
Show Answer
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Correct Answer: should be decreased
10. A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is
Options
A. 564
B. 0.564
C. 6.76
D. 55.7
Show Answer
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Discuss
Correct Answer: 0.564
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Alternating Current and Voltage
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Capacitors
Circuit Theorems and Conversions
Circuit Theorems in AC Analysis
Energy and Power
Inductors
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Ohm's Law
Parallel Circuits
Passive Filters
Quantities and Units
RC Circuits
RL Circuits
RLC Circuits and Resonance
Series Circuits
Series-Parallel Circuits
Three-Phase Systems in Power Applications
Time Response of Reactive Circuits
Transformers
Voltage, Current and Resistance