A. resistive
B. inductive
C. capacitive
D. none of the above
At very low frequencies a series R-C circuit behaves as almost purely___________? Read More »
A.C. Fundamentals, Circuits and Circuit Theory A. 200 Hz
B. 100 Hz
C. 60 Hz
D. 50 Hz
The frequency of domestic power supply in Pakistan is_________? Read More »
A.C. Fundamentals, Circuits and Circuit Theory A. high voltage across the load
B. low voltage across the load
C. unequal line voltages across the load
D. minimun voltage across the load
A. 282.8 V
B. 141.4 V
C. 111 V
D. 100 V
A. Square wave
B. Sine wave
C. Half wave rectified sine wave
D. Triangular wave
Which of the following waves has the highest value of peak factor ___________? Read More »
A.C. Fundamentals, Circuits and Circuit Theory A. increasing core length
B. decreasing the number of turns
C. decreasing the diameter of the former
D. choosing core material having high relative permeability
The inductance of a coil can be increased by_________? Read More »
A.C. Fundamentals, Circuits and Circuit Theory A. Vc and VR
B. VL and VR
C. Vc and VL
D. none of the above
A. 0.5 of peak value
B. 0.707 of peak value
C. same as peak value
D. zero
The r.m.s. value of pure cosine function is_________? Read More »
A.C. Fundamentals, Circuits and Circuit Theory A. series resistance needs a low-resistance source for sharp rise in current
B. series resonance needs a high-resistance source for sharp increase in current
C. parallel resonance needs a low-resistance source for a sharp in¬crease in impedance
D. parallel resonance needs a low-resistance source for a sharp rise in line current
The series and parallel resonance on L-C circuit’ differs in that_________? Read More »
A.C. Fundamentals, Circuits and Circuit Theory A. the speed with which the alternator runs
B. the number of cycles generated in one minute
C. the number of waves passing through a point in one second
D. the number of electrons passing through a point in one second
The frequency of an alternating current is____________? Read More »
A.C. Fundamentals, Circuits and Circuit Theory