A. 100 n
B. 50 jt
C. 25 JT
D. 5 n
A.C. Fundamentals, Circuits and Circuit Theory
In a pure resistive circuit__________?
A. current lags behind the voltage by 90°
B. current leads the voltage by 90°
C. current can lead or lag the voltage by 90°
D. current is in phase with the voltage
The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?
A. 282.8 V
B. 141.4 V
C. 111 V
D. 100 V
Poor power factor________?
A. reduces load handling capability of electrical system
B. results in more power losses in the electrical system
C. overloads alternators, transformers and distribution lines
D. results in more voltage drop in the line
E. results in all above
In AC. circuits, laminated iron is invariably used in order to__________?
A. reduce eddy current loss
B. increase heat radiation
C. make assembly cheap and easier
D. reduce circuit permeability
Which of the following statements pertains to resistors only _____________?
A. can dissipate considerable amount of power
B. can act as energy storage devices
C. connecting them in parallel in¬creases the total value
D. oppose sudden changes in voltage
Power factor of the following circuit will be unity
A. inductance
B. capacitance
C. resistance
D. both A. and B.
If two sine waves of the same frequency have a phase difference of JT radians, then_______?
A. both will reach their minimum values at the same instant
B. both will reach their maximum values at the same instant
C. when one wave reaches its maxi¬mum value, the other will reach its minimum value
D. none of the above
In a parallel R-C circuit, the current always________the applied voltage?
A. lags
B. leads
C. remains in phase with
D. none of the above
When an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?
A. apparent power
B. true power
C. reactive power
D. none of the above
