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Inductors
Comments
Question
A transformer will have:
Options
A. primary and secondary windings
B. primary and secondary current
C. primary wattage producing secondary current
D. different frequencies for the primary and secondary
Correct Answer
primary and secondary windings
Inductors problems
Search Results
1. A turns ratio of 5 for a transformer implies:
Options
A. more primary turns than secondary turns
B. more secondary current than primary current
C. larger source impedance than load impedance
D. more secondary turns than primary turns
Show Answer
Scratch Pad
Discuss
Correct Answer: more secondary turns than primary turns
2. What are the properties that determine the inductance of a coil?
Options
A. Length of wire, number of turns, type of core material, length of core
B. Number of turns, type of wire, length of core, and cross-sectional area of core
C. Type of core material, number of turns, cross-sectional area of core, and length of core
D. Type of core material, type of wire, number of turns, and cross-sectional area of core
Show Answer
Scratch Pad
Discuss
Correct Answer: Type of core material, number of turns, cross-sectional area of core, and length of core
3. During a current change, the ability of a conductor to produce counter emf within itself is called:
Options
A. back emf
B. self-induction
C. a henry
D. impedance
Show Answer
Scratch Pad
Discuss
Correct Answer: self-induction
4. What is the name of the part inside a relay that is moved by the action of the electromagnet?
Options
A. armature
B. conductor
C. contacts
D. solenoid
Show Answer
Scratch Pad
Discuss
Correct Answer: armature
5. A henry value divided by a circuit resistive value provides the:
Options
A. counter emf value
B. induced voltage amplitude
C. rise or decay time constant
D. quality factor of the coil
Show Answer
Scratch Pad
Discuss
Correct Answer: induced voltage amplitude
6. What is hysteresis?
Options
A. lead between cause and effect
B. lag between cause and effect
C. lead between voltage and current
D. lag between voltage and current
Show Answer
Scratch Pad
Discuss
Correct Answer: lag between cause and effect
7. With 100 V
ac
applied to the primary of a transformer so that it draws 500 mA, what will be the 300 V
ac
secondary current?
Options
A. 1500 mA
B. 200 mA
C. 167 mA
D. 150 mA
Show Answer
Scratch Pad
Discuss
Correct Answer: 167 mA
8. Which of the following is NOT one of the three major types of fixed inductor?
Options
A. air core
B. ferrite core
C. magnesium core
D. iron core
Show Answer
Scratch Pad
Discuss
Correct Answer: magnesium core
9. Opposition to current flow without the dissipation of energy is called:
Options
A. resistance
B. inductive reactance
C. counter emf
D. impedance
Show Answer
Scratch Pad
Discuss
Correct Answer: inductive reactance
10. What is the permeability of transformer iron?
Options
A. 50
B. 450
C. 1,500
D. 5,500
Show Answer
Scratch Pad
Discuss
Correct Answer: 5,500
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