Multiple Choice Questions Topic Outline
- MCQs in AC-DC circuits
- MCQs in Resistors
- MCQs in Inductors
- MCQs in Capacitors
The Six-Parts Series
Following is the list of multiple choice questions in this brand new series:
Start with Part I of the MCQs Series
1. Conventional flow assumes charges flow from
- A. Positive to negative
- B. Positive to positive
- C. Negative to positive
- D. Negative to negative
2. Electron flow assumes charges flow from
- A. Negative to positive
- B. Negative to negative
- C. Positive to negative
- D. Positive to positive
3. Series resonance occurs when
- A. XL = XC
- B. XL = R
- C. Z = R
- D. Both A and C
4. The symbol Q refers to
- A. Resonance quotient
- B. Quality factor
- C. Power quotient
- D. Qualification test
5. The ratio of W/VA in an ac circuit means
- A. Power factor
- B. Reactive factor
- C. Quality factor
- D. Load factor
6. What is the reciprocal of quality factor?
- A. Power factor
- B. Reactive factor
- C. Dissipation factor
- D. 1/Q factor
7. In liquids and gases, ionization current results from a flow of
- A. Positive or negative ions
- B. Free electrons
- C. Ions that are lighter in weight than electrons
- D. Protons
8. VL = VC in a series RLC circuit when
- A. The value of the impedance is minimum
- B. The power factor is zero
- C. The current leads the total voltage by 90˚
- D. The total voltage is zero
9. At what frequency will an inductor of 5mH have the same reactance as a capacitor of 0.1 μF?
- A. 7.12 kHz
- B. 7.12 Hz
- C. 7.12MHz
- D. 7.12 GHz
10. Property of an electric circuit that dissipates electric energy
- A. Reactance
- B. Impedance
- C. Resistance
- D. Conductance
11. What is the other name of relative permittivity?
- A. Dielectric strength
- B. Potential gradient
- C. Breakdown voltage
- D. Specific inductance capacity
12. In a series RLC circuit
- A. The current lags VL by 90˚
- B. The current leads VL by 90˚
- C. XL leads Xc by 90˚
- D. Z = jXL at resonance
13. Resistor with colored bands in the body
- A. Wire-wound resistor
- B. Carbon-composition resistor
- C. Potentiometer
- D. Rheostat
14. In a resonant circuit, if Q ≥ 10 resonant frequency _______ bandwidth.
- A. Bisects
- B. Exceeds
- C. Is less than
- D. Is equal to
15. Which of the following conditions is not true for a series RLC circuit at resonance?
- A. Z = jXL
- B. XL = XC
- C. The power factor is one
- D. The magnitude of Z is
16. The current is ____ times the maximum current at half-power points of a resonance curve.
- A. 0.707
- B. 1.414
- C. 0.5
- D. 0.632
17. A gang capacitor is a variable capacitor in which capacitance is varied by changing the
- A. Dielectric
- B. Number of plates
- C. Plate area
- D. Distance between plates
18. In an ac circuit with inductive reactance, the
- A. Phase angle of the circuit is always 45˚
- B. Voltage across the inductance must be 90˚ out-of-phase with the applied voltage
- C. Current through the inductance lags its induced voltage by 90˚
- D. Current through the inductance and voltage across it are180˚ out-of-phase
19. If three 9 mH inductors are connected in parallel without mutual inductance then the total inductance is
- A. 3 mH
- B. 9 mH
- C. 27 mH
- D. 18 mH
20. What is the specific resistance of a pure germanium?
- A. 55 Ω-cm
- B. 55 Ω-m
- C. 55 Ω-mm
- D. 55 kΩ-m
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
31. If a capacitor is rated for 200V dc, what is its effective ac working voltage?
- A. 50 V
- B. 100 V
- C. 200 V
- D. 400 V
32. If resonant frequency is 10 kHz and quality factor is 50, then
- A. Bandwidth is 200 Hz
- B. XL = is 50,000 Ω
- C. R is 50 Ω
- D. XC = is 50,000 Ω
33. Which statement is true?
- A. A series resonant circuit is of high impedance
- B. A parallel resonant circuit is of low impedance
- C. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency
- D. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency
34. What is considered as the most important value of a sine wave?
- A. Effective value
- B. Peak value
- C. Average value
- D. Instantaneous value
35. An ac series circuit is composed of a resistance of 20 Ω, inductive reactance of 40 Ω, and a capacitive reactance of 15 Ω. If a current of 1 ampere is flowing, what is the applied voltage
- A. 320 V
- B. 32 V
- C. 220 V
- D. 22 V
36. An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil
- A. Faradic current
- B. Transient ac current
- C. Inductive current
- D. Capacitive current
37. The value of temperature coefficient (α) is dependent upon
- A. The nature of material and temperature
- B. The length of material
- C. The cross-sectional area of the material
- D. The volume of the material
38. At what frequency will the current in a series RLC circuit reach its maximum value for an applied voltage of 15 V with R = 500 Ω, L = 100 μH and C = 0.001 μF?
- A. 503 kHz
- B. 403 kHz
- C. 603 kHz
- D. 303 kHz
39. If two equal resistances connected in series across a certain supply are now connected in parallel across the same supply, the power produced will be _____ that of series connection
- A. One-half
- B. One-fourth
- C. Two times
- D. Four times
40. The voltage lags the current by cycle in a
- A. Purely resistive circuit
- B. Purely inductive circuit
- C. Purely capacitive circuit
- D. Circuit containing resistance, capacitance and inductance
41. What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?
- A. 1.65 kHz
- B. 16.5 MHz
- C. 16.5 kHz
- D. 165 kHz
42. Which one of the following elements serves as a protection against overload?
- A. Fuse
- B. Switch
- C. Resistor
- D. Relay
43. Transient period is considered over after
- A. 5
- B. 1
- C. 100
- D. 6
44. What rating of a resistor determines its ability to absorb heat?
- A. Wattage
- B. Ohmic
- C. Current
- D. Voltage
45. An open inductor has
- A. Zero resistance and infinite inductance
- B. Infinite resistance and zero inductance
- C. Infinite resistance and infinite inductance
- D. Zero resistance and zero inductance
46. What is the reading of an ohmmeter for a shorted capacitor?
- A. Zero
- B. Infinity
- C. k Ω
- D. M Ω
47. What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?
- A. Surge
- B. Stray
- C. Natural
- D. Normal
48. The average value of a triangular or sawtooth wave is _____ times its peak value.
- A. 0.577
- B. 0.500
- C. 0.318
- D. 0.637
49. A series RLC circuit consists of a 10 Ω resistor in series with L = 10 μH, and C = 100 μF. Determine a new value of I, for which the resonant frequency is one –half the original value.
- A. 40 μH
- B. 40 mH
- C. 40 pH
- D. 40 nH
50. What is the peak factor of a triangular wave?
- A. 1.16
- B. 1.73
- C. 1.41
- D. 1.11
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