In a purely inductive circuit, current leads voltage by 90� voltage lags current

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Question
In a purely inductive circuit,
Options
A. current leads voltage by 90�
B. voltage lags current by 90�
C. voltage leads current by 90�
D. voltage and current are in phase (0�)

Correct Answer

voltage leads current by 90�

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1. What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 kΩ, and a 1 kΩ resistor are in series with a source?
Options
A. 0.1 degrees
B. 9.0 degrees
C. 61.0 degrees
D. 81.0 degrees

2. Counter emf or induced voltage is:
Options
A. inversely proportional to the change in current
B. directly proportional to the change in time
C. directly proportional to the inductance in henrys
D. inversely proportional to the inductance in henrys

4. A utility pole transformer used to supply a residential customer with two phases uses:
Options
A. two phases on the primary
B. a center tap on the secondary
C. a separate ground for each phase
D. a small coefficient of coupling

5. Which two values are plotted on a B-H curve graph?
Options
A. reluctance and flux density
B. permeability and reluctance
C. magnetizing force and permeability
D. flux density and magnetizing force

7. In a transformer, what will happen to the primary current if the secondary magnetic field increases?
Options
A. I_p will increase.
B. I_p will be canceled.
C. I_p will remain the same.
D. I_p will decrease.

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