Related Questions

What table shows the electrical state of a digital circuit's output for every possible combination of electrical states in the inputs?
A Function table
B Truth table
C Routing table
D ASCII table
E None of the above
A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
A remain same
B go down
C improve
D none of the above
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?
A E.M.F.
B Current
C Current density
D Conductivity
Which one of the following properties of a magnetic circuit can be directly compared to current in an electrical circuit?
A Number of lines of force
B Flux density
C Reluctance
D Magnetomotive force
E None of the above
Which one of the following properties of a magnetic circuit can be directly compared to resistance in an electrical circuit?
A Reluctance
B Permeability
C Permeance
D Retentivity
E There is no valid comparison
Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit?
A Flux density
B Number of lines of force
C Magnetomotive force
D Reluctance
E None of the above
A Circuit having power factor of 0.8 consumes 40W. The value of reactive power (VAR) is-
A 20
B 40
C 30
D 10
If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor
A will become more
B will become less
C will remain unchanged
D none of the above.
If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor
A become more
B become less
C remain constant
D none of the above
A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is -
A 87.8%
B 86.7%
C 88.26%
D 88.9%

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