MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The circuit in the given circuit is a low-pass filter. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
When the resistance is greater than the capacitive reactance in a series RC circuit, the phase angle is ___. |
| A. | 0 |
| B. | between 0 and 45 |
| C. | between 45 and 90 |
| D. | 45 |
| Answer» C. between 45 and 90 | |
| 3. |
The true power in the given circuit equals ___. |
| A. | 48.48 mW |
| B. | 296.93 mW |
| C. | 280.64 mW |
| D. | 96.98 mW |
| Answer» E. | |
| 4. |
The hypotenuse of the right triangle of a vector diagram for R and XC is _______________. |
| A. | impedance |
| B. | current |
| C. | voltage |
| D. | power |
| Answer» B. current | |
| 5. |
The ___ cannot change instantaneously in an inductor. |
| A. | voltage |
| B. | current |
| C. | power |
| D. | magnetic field |
| Answer» C. power | |
| 6. |
The inductance value of L3 in the given figure is _____ if the total inductance is 340 mH. |
| A. | 150 mH |
| B. | 220 mH |
| C. | 295 mH |
| D. | 315 mH |
| Answer» B. 220 mH | |
| 7. |
When current flow tries to decrease in an inductor, the magnetic field _______________ and the voltage polarity across the inductor _______________. |
| A. | collapses, remains the same |
| B. | expands, reverses |
| C. | collapses, reverses |
| D. | expands, remains the same |
| Answer» D. expands, remains the same | |
| 8. |
Electromagnetic induction is the generation of _________ from __________. |
| A. | magnetism, electricity |
| B. | electricity, electricity |
| C. | electricity, magnetism |
| D. | magnetism, magnetism |
| Answer» D. magnetism, magnetism | |
| 9. |
Inductive ___ represents the opposition to an alternating current. |
| A. | impedance |
| B. | resistance |
| C. | reluctance |
| D. | reactance |
| Answer» E. | |
| 10. |
The opposition to ac by an inductor is directly proportional to ___. |
| A. | resistance |
| B. | reactance |
| C. | frequency |
| D. | voltage |
| Answer» D. voltage | |
| 11. |
An RL integrator can act as a __________ filter and an RC differentiator can act as a __________ filter. |
| A. | high-pass, high-pass |
| B. | low-pass, low-pass |
| C. | high-pass, low pass |
| D. | low-pass, high-pass |
| Answer» E. | |
| 12. |
Inductance is proportional to the cross-sectional area of a coil. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
A step-up transformer will have a turns ratio greater than 1. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
The secondary current in a transformer depends on the secondary voltage and load resistance values. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
Kirchhoff's voltage law does not apply to series RL circuits. |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
Magnetic force is the force that produces a magnetic field. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 17. |
A magnet consisting of a coil of wire wound around a soft iron or steel core is called an electromagnet. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
The output of the secondary winding is 15 V. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 19. |
For inductions in series, LT = L1 + L2 + L3 +... |
| A. | True |
| B. | False |
| Answer» B. False | |
| 20. |
The total inductance in the given circuit is 0.6 mH. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
Inductors connected in series will increase the total inductance value. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
Inductors are not as versatile as capacitors. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 23. |
An ac generator will produce a constant waveform. |
| A. | True |
| B. | False |
| Answer» C. | |
| 24. |
Faraday's law states that the polarity of induced voltage in a coil is in opposition to the current change through that coil. |
| A. | True |
| B. | False |
| Answer» C. | |
| 25. |
The current through an inductor in a parallel RL circuit leads the current through the resistor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 26. |
___ is the concept of one coil inducing a voltage into another coil. |
| A. | Electrical isolation |
| B. | Self-inductance |
| C. | Mutual inductance |
| D. | Coefficient of coupling |
| Answer» D. Coefficient of coupling | |
| 27. |
A(n) _____ transformer is usually used for audio or power applications. |
| A. | iron-core |
| B. | air-core |
| C. | ferrite-core |
| D. | All of the above |
| Answer» B. air-core | |
| 28. |
If the impedance equals 2 k in a parallel RC circuit, the admittance equals ___. |
| A. | More information is needed in order to find the admittance. |
| B. | 2 kS |
| C. | 4 kS |
| D. | 500 S |
| Answer» E. | |
| 29. |
A(n) ___ is sometimes constructed as a variable transformer. |
| A. | autotransformer |
| B. | center-tapped transformer |
| C. | multiple-tap transformer |
| D. | multiple-winding transformer |
| Answer» B. center-tapped transformer | |
| 30. |
After a voltage has been applied to an inductor, the current will be ___ of its full value after 2 time constants. |
| A. | 63% |
| B. | 86% |
| C. | 95% |
| D. | 98% |
| Answer» C. 95% | |
| 31. |
The ___ of a coil is the inherent resistance of the wire. |
| A. | ac resistance |
| B. | reactance |
| C. | winding resistance |
| D. | permeability |
| Answer» D. permeability | |
| 32. |
___ power represents the energy dissipated at a given point in time. |
| A. | True |
| B. | Reactive |
| C. | Real |
| D. | Instantaneous |
| Answer» E. | |
| 33. |
After the first time constant, a transient current has changed by _______________ %, leaving _______________ % remaining. |
| A. | 63.2, 36.8 |
| B. | 36.8, 63.2 |
| C. | 13.5, 86.5 |
| D. | 86.5, 13.5 |
| Answer» B. 36.8, 63.2 | |
| 34. |
The primary winding of a transformer is the side connected to the load. |
| A. | True |
| B. | False |
| Answer» C. | |
| 35. |
The time constant of an inductive circuit is dependent on the circuit's resistance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 36. |
The amount of dc current that an inductor will allow to pass depends on the circuit's total resistance that is in series with it. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 37. |
An inductor will boost current flow. |
| A. | True |
| B. | False |
| Answer» C. | |
| 38. |
An air-core inductor has a metal core. |
| A. | True |
| B. | False |
| Answer» C. | |
| 39. |
The secondary current is _____ in the given circuit. |
| A. | 1.9 mA |
| B. | 7.5 mA |
| C. | 30 mA |
| D. | 60 mA |
| Answer» D. 60 mA | |
| 40. |
To ensure a high coefficient of coupling, all fixed transformers are usually wound on a(n) _____________. |
| A. | EI core |
| B. | iron core |
| C. | common core |
| D. | CI core |
| Answer» D. CI core | |
| 41. |
Making the load resistance appear the same as the source's internal resistance is called _____. |
| A. | maximum power transfer |
| B. | reflected resistance |
| C. | impedance matching |
| D. | reflected load |
| Answer» D. reflected load | |
| 42. |
A transformer turns ratio of ________ will be needed to match an output impedance of 5 k to an 8 speaker. |
| A. | 5:1 |
| B. | 8:1 |
| C. | 25:1 |
| D. | 625:1 |
| Answer» D. 625:1 | |
| 43. |
If voltage is stepped-up to the secondary, current will be stepped-down by the same amount. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 44. |
In the given circuit, the secondary voltage is in phase with the primary voltage. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 45. |
The reflected load value that the source sees will always be larger than the load value itself. |
| A. | True |
| B. | False |
| Answer» C. | |
| 46. |
The C-B configuration is used to provide which type of gain? |
| A. | voltage |
| B. | current |
| C. | resistance |
| D. | power |
| Answer» B. current | |
| 47. |
In a C-E configuration, an emitter resistor is used for: |
| A. | stabilization |
| B. | ac signal bypass |
| C. | collector bias |
| D. | higher gain |
| Answer» B. ac signal bypass | |
| 48. |
Often a common-collector will be the last stage before the load; the main function(s) of this stage is to: |
| A. | provide voltage gain |
| B. | provide phase inversion |
| C. | provide a high-frequency path to improve the frequency response |
| D. | buffer the voltage amplifiers from the low-resistance load and provide impedance matching for maximum power transfer |
| Answer» E. | |
| 49. |
For a C-C configuration to operate properly, the collector-base junction should be reverse biased, while forward bias should be applied to which junction? |
| A. | collector-emitter |
| B. | base-emitter |
| C. | collector-base |
| D. | cathode-anode |
| Answer» B. base-emitter | |
| 50. |
The input/output relationship of the common-collector and common-base amplifiers is: |
| A. | 270 degrees |
| B. | 180 degrees |
| C. | 90 degrees |
| D. | 0 degrees |
| Answer» E. | |