Electrical Circuits MCQs Part 03

Electrical Circuits MCQs Part 03

21. Two capacitors of capacitance 9 µF and 18 µF in series will have a total capacitance of
A. 27 µF
B. 162 µF
C. 6 µF
D. 180 µF

22. In a series RLC circuit
A. Increasing the frequency decreases the resistance
B. Increasing the frequency increases the resistance
C. Both XL  and XC change as frequency changes
D. Impedance will always decrease

23. A series RLC circuit has a ________ power factor at its half-power points
A. Unity
B. Leading
C. Lagging
D. Either B or C

24. Kirchhoff’s laws (KCL and KVL) are applicable to
A. DC circuits
B. AC circuits
C. DC as well as AC circuits
D. Passive networks alone

25. A tank circuit is a
A. Parallel LC circuit
B. Series LC circuit
C. A resonant circuit
D. A non-resonant circuit

26. A capacitive load always has a _________    power facto
A. Leading
B. Lagging
C. Zero
D. Unity

27. What is the temperature coefficient of the resistance Eureka?
A. Infinity
B. Negative
C. Almost zero
D. Positive

28. As applied to a series RLC circuit, bandwidth means
A. The frequency range for maximum power transfer
B. The difference between the highest and lowest frequencies of the oscillator
C. The separation of the half-power points
D. The frequency at which XL = XC

29. Which is considered as the effect of a dielectric material?
A. Increasing capacitance
B. Decreasing capacitance
C. Reducing the working voltage
D. Increasing the distance between the plates

30. The open-circuit voltage at the terminal of load RL is 60V.    Under the condition of maximum power transfer, the load voltage will be
A. 60 V
B. 15 V
C. 20 V
D. 30 V