15.
The polarity of induced voltage while a field is collapsing is:
A. independent of the force creating it
B. opposite to the force creating it
C. identical to the force creating the field
D. present only if the force is stationary
Answer & Explanation
Answer: Option B
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
16.
What is the permeability of transformer iron?
A. 50 B. 450
C. 1,500 D. 5,500
Answer & Explanation
Answer: Option D
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
17.
Electromagnetism is the:
A. magnetic field caused by a permanent magnet
B. action between a permanent and an artificial magnet
C. magnetic field action with a current-carrying wire
D. current in the coil
Answer & Explanation
Answer: Option C
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
18.
A magnetic field has:
A. polar fields
B. lines of force
C. magnetomotive force
D. lines of reluctance
Answer & Explanation
Answer: Option B
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
19.
Which two values are plotted on a B-H curve graph?
A. reluctance and flux density
B. permeability and reluctance
C. magnetizing force and permeability
D. flux density and magnetizing force
Answer & Explanation
Answer: Option D
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
20.
What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 Vac at the secondary?
A. 75 turns
B. 150 turns
C. 900 turns
D. 1920 turns
Answer & Explanation
Answer: Option B
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
21.
The four factors determining inductance are the number of turns, coil length, coil area, and:
A. permeability
B. reluctance
C. counter emf
D. coefficient of coupling
Answer & Explanation
Answer: Option A
Explanation:
No answer description available for this question.