ECEN 340 Exam 2 questions well
answered to pass
The "Ohm's law" for the magnetic circuit states that the net magnetomotive force (mmf) equals
the product of reluctance and flux. - correct answer ✔✔ T
For magnetic circuits, the fringing effect of air gaps in the core will make the reluctance of the
air gap larger. - correct answer ✔✔ F
According to Faraday's law, voltage is induced in a coil if there is a constant magnetic field
nearby. - correct answer ✔✔ F
For a toroid with an air gap, flux will decrease as the air gap length increases. - correct answer
✔✔ T
If a reference current ENTERS a dotted terminal, the induced voltage on the other coil will be
POSITIVE at the DOTTED terminal. - correct answer ✔✔ T
If a reference current ENTERS a dotted terminal of a coil, the induced voltage on the other coil
will be NEGATIVE at the UNDOTTED terminal. - correct answer ✔✔ T
If a reference current LEAVES a dotted terminal, the induced voltage on the other coil will be
NEGATIVE at the DOTTED terminal. - correct answer ✔✔ T
The efficiency of an ideal transformer is slightly less than 100%. - correct answer ✔✔ F
answered to pass
The "Ohm's law" for the magnetic circuit states that the net magnetomotive force (mmf) equals
the product of reluctance and flux. - correct answer ✔✔ T
For magnetic circuits, the fringing effect of air gaps in the core will make the reluctance of the
air gap larger. - correct answer ✔✔ F
According to Faraday's law, voltage is induced in a coil if there is a constant magnetic field
nearby. - correct answer ✔✔ F
For a toroid with an air gap, flux will decrease as the air gap length increases. - correct answer
✔✔ T
If a reference current ENTERS a dotted terminal, the induced voltage on the other coil will be
POSITIVE at the DOTTED terminal. - correct answer ✔✔ T
If a reference current ENTERS a dotted terminal of a coil, the induced voltage on the other coil
will be NEGATIVE at the UNDOTTED terminal. - correct answer ✔✔ T
If a reference current LEAVES a dotted terminal, the induced voltage on the other coil will be
NEGATIVE at the DOTTED terminal. - correct answer ✔✔ T
The efficiency of an ideal transformer is slightly less than 100%. - correct answer ✔✔ F
