MCQOPTIONS
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MCQOPTIONS
This section includes 130 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
VSAT was made available in |
| A. | 1979 |
| B. | 1981 |
| C. | 1983 |
| D. | 1977 |
| Answer» B. 1981 | |
| 2. |
A helical antenna is used for satellite tracking because of |
| A. | Circular polarization |
| B. | Maneuverability |
| C. | Beamwidth |
| D. | Gain |
| Answer» B. Maneuverability | |
| 3. |
A satellite signal transmitted from a satellite transponder to earth’s station. |
| A. | Uplink |
| B. | Downlink |
| C. | Terrestrial |
| D. | Earthbound |
| Answer» C. Terrestrial | |
| 4. |
What band does VSAT first operate? |
| A. | L-band |
| B. | X-band |
| C. | C-band |
| D. | Ku-band |
| Answer» D. Ku-band | |
| 5. |
Most mobile satellite array uses ___________ in transforming 50 to 150 Ω impedance. |
| A. | Stub |
| B. | Balun |
| C. | Quarter-wavelength transformer |
| D. | Microstrip tapers |
| Answer» D. Microstrip tapers | |
| 6. |
A satellite beam that covers almost 42.4% of the earths surface. |
| A. | Zone beam |
| B. | Hemispheric beam |
| C. | Spot beam |
| D. | Global beam |
| Answer» E. | |
| 7. |
As the height of a satellite orbit gets lower, the speed of the satellite ___________. |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | None of the above |
| Answer» B. Decreases | |
| 8. |
Considered as the unsolved problem in satellite system |
| A. | Coverage |
| B. | Cost |
| C. | Access |
| D. | Privacy |
| Answer» E. | |
| 9. |
Is a loss of power of a satellite downlink signal due to earth’s atmosphere. |
| A. | Atmospheric loss |
| B. | Path loss |
| C. | Radiation loss |
| D. | RFI |
| Answer» C. Radiation loss | |
| 10. |
Application of Norton’s theorem to a circuit yields |
| A. | Equivalent current source and impedance in series |
| B. | Equivalent current source and impedance in parallel |
| C. | Equivalent impedance |
| D. | Equivalent current source |
| Answer» B. Equivalent current source and impedance in parallel | |
| 11. |
Which of the following is a bilateral element? |
| A. | Constant current source |
| B. | Constant voltage source |
| C. | Capacitance |
| D. | None of the above |
| Answer» D. None of the above | |
| 12. |
Between the branch voltages of a loop the Kirchhoff's voltage law imposes |
| A. | Nonlinear constraints |
| B. | Linear constraints |
| C. | No constraints |
| D. | None of the above |
| Answer» C. No constraints | |
| 13. |
Which of the following is not a nonlinear element ? |
| A. | Gas diode |
| B. | Heater coil |
| C. | Tunnel diode |
| D. | Electric arc |
| Answer» C. Tunnel diode | |
| 14. |
A closed path made by several branches of the network is known as |
| A. | Branch |
| B. | Loop |
| C. | Circuit |
| D. | Junction |
| Answer» C. Circuit | |
| 15. |
The superposition theorem requires as many circuits to be solved as there are |
| A. | Sources, nodes and meshes |
| B. | Sources and nodes |
| C. | Sources |
| D. | Nodes |
| Answer» D. Nodes | |
| 16. |
According to Kirchhoff’s voltage law, the algebraic sum of all IR drops and e.m.f. in any closed loop of a network is always |
| A. | Negative |
| B. | Positive |
| C. | Determined by battery e.m.f. |
| D. | Zero |
| Answer» E. | |
| 17. |
A galvanometer has |
| A. | Air friction damping |
| B. | Fluid friction damping |
| C. | Spring coil damping |
| D. | Eddy current damping |
| Answer» E. | |
| 18. |
A 10MHz CRO has |
| A. | 5MHz sweep |
| B. | 10MHz vertical oscillator |
| C. | 10MHz horizontal oscillator |
| D. | 10MHz supply frequency |
| Answer» D. 10MHz supply frequency | |
| 19. |
A CRO can display |
| A. | AC signals |
| B. | DC signals |
| C. | Both AC and DC signals |
| D. | Time invariant signals |
| Answer» D. Time invariant signals | |
| 20. |
Which of the following meters has a linear scale? |
| A. | Thermocouple meter |
| B. | Moving iron meter |
| C. | Hot wore meter |
| D. | Moving coil meter |
| Answer» E. | |
| 21. |
A moving iron ammeter may be compensated for frequency errors by |
| A. | A shunt resistance |
| B. | A series inductance |
| C. | Shunt capacitance |
| D. | Series resistance |
| Answer» D. Series resistance | |
| 22. |
Why is a MISC meter not recommended for DC measurement? |
| A. | The meter is calibrated for AC and it’s error for DC would be high |
| B. | The meter does not respond to DC signals |
| C. | The error is high due to hysteresis effect |
| D. | The error is high due to eddy current effect |
| Answer» D. The error is high due to eddy current effect | |
| 23. |
The spring material used in a spring control device should have the following property. |
| A. | Should be nonmagnetic |
| B. | Most be of low temperature coefficient |
| C. | Should have low specific resistance |
| D. | All of the above |
| Answer» E. | |
| 24. |
An open wire transmission line having a characteristic impedance of 600 ohms is terminated by a resistive load of 900 O. The standing wave ratio will be |
| A. | 1.5 |
| B. | 2.5 |
| C. | 3.5 |
| D. | 4.5 |
| Answer» B. 2.5 | |
| 25. |
A 470 Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is |
| A. | 12.60 ∠-76° mS |
| B. | 12.18 ∠76° mS |
| C. | 218 ∠-76° mS |
| D. | 12.18 ∠-76° mS |
| Answer» E. | |
| 26. |
A 3.3 kΩ resistor and a 120 mH coil are in parallel. Both components are across a 2 kHz, 12 V ac source. The total current in the circuit is |
| A. | 8.74 mA |
| B. | 874 mA |
| C. | 874 µA |
| D. | 8.74 µA |
| Answer» B. 874 mA | |
| 27. |
A 470 Ω resistor and a coil with 125 Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is |
| A. | 152 mA |
| B. | 32 mA |
| C. | 12 mA |
| D. | 120 mA |
| Answer» E. | |
| 28. |
When the frequency is decreased, the impedance of a parallel RL circuit Increases |
| A. | Decreases |
| B. | Increases |
| C. | Does not change |
| D. | Cannot be determined without values |
| Answer» C. Does not change | |
| 29. |
A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is |
| A. | 47 ∠68.6° Ω |
| B. | 120 ∠68.6° Ω |
| C. | 129 ∠31.4° Ω |
| D. | 129 ∠68.6° Ω |
| Answer» E. | |
| 30. |
A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 ∠0° mA. The source voltage, expressed in polar form, is |
| A. | 3.84 ∠20.6° V |
| B. | 12.8 ∠20.6° V |
| C. | 0.3 ∠20.6° V |
| D. | 13.84 ∠69.4° V |
| Answer» B. 12.8 ∠20.6° V | |
| 31. |
A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is |
| A. | 152.6 Ω |
| B. | 1,526 Ω |
| C. | 1,200 Ω |
| D. | 942 Ω |
| Answer» C. 1,200 Ω | |
| 32. |
A 140 Ω resistor is in parallel with an inductor having 60 Ω inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is |
| A. | 5.51 Ω |
| B. | 55.15 Ω |
| C. | 90 Ω |
| D. | 200 Ω |
| Answer» C. 90 Ω | |
| 33. |
A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is |
| A. | 564 |
| B. | 0.564 |
| C. | 6.76 |
| D. | 55.7 |
| Answer» C. 6.76 | |
| 34. |
A 24 Ω resistor, an inductor with a reactance of 120 Ω, and a capacitor with a reactance of 120 Ω are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is |
| A. | 60 V |
| B. | 660 V |
| C. | 30 V |
| D. | 300 V |
| Answer» E. | |
| 35. |
A 90 Ω resistor, a coil with 30 Ω of reactance, and a capacitor with 50 Ω of reactance are in series across a 12 V ac source. The current through the resistor is |
| A. | 9 mA |
| B. | 90 mA |
| C. | 13 mA |
| D. | 130 mA |
| Answer» E. | |
| 36. |
A 10 Ω resistor, a 90 mH coil, and a 0.015 µF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is |
| A. | 1,616 Ω |
| B. | 161 Ω |
| C. | 3,387 Ω |
| D. | 1,771 Ω |
| Answer» B. 161 Ω | |
| 37. |
A 15 Ω resistor, a 220 µH coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit? |
| A. | 138 MHz |
| B. | 10,866 Hz |
| C. | 1,907 Hz |
| D. | 138 kHz |
| Answer» C. 1,907 Hz | |
| 38. |
In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is |
| A. | 125 V |
| B. | 250 V |
| C. | 290 V |
| D. | 40 V |
| Answer» E. | |
| 39. |
A resistor of 3 kΩ, a 0.05 µF capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form? |
| A. | 636 Ω |
| B. | 3,769 Ω |
| C. | 433 Ω |
| D. | 4,337 Ω |
| Answer» E. | |
| 40. |
A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 Ω, C = 80 µF, and L = 10 mH. The total impedance, expressed in polar form, is |
| A. | 12.28 ∠12.34° Ω |
| B. | 12.57 ∠12.34° Ω |
| C. | 9.95 ∠12.34° Ω |
| D. | 12.62 ∠12.34° Ω |
| Answer» B. 12.57 ∠12.34° Ω | |
| 41. |
A 12 Ω resistor, a 40 µF capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is |
| A. | 28.1 Hz |
| B. | 281 Hz |
| C. | 2,810 Hz |
| D. | 10 kHz |
| Answer» C. 2,810 Hz | |
| 42. |
A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source. The circuit impedance is |
| A. | 12.7 Ω |
| B. | 127 Ω |
| C. | 4,436 Ω |
| D. | 6,174 Ω |
| Answer» B. 127 Ω | |
| 43. |
A 200 Ω resistor, a coil with 30 Ω of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance is |
| A. | 230 Ω |
| B. | 170 Ω |
| C. | 200 Ω |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 44. |
A 9 mH coil is in parallel with a 0.015 µF capacitor across an 18 kHz ac source. The coil's internal resistance RW, is 60 Ω. The circuit impedance is |
| A. | 17,340 Ω |
| B. | 1,734 Ω |
| C. | 290 Ω |
| D. | 1,018 Ω |
| Answer» B. 1,734 Ω | |
| 45. |
The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 µF, and RW = 90 Ω is |
| A. | 0 Ω |
| B. | 90 Ω |
| C. | 20 Ω |
| D. | 40 Ω |
| Answer» C. 20 Ω | |
| 46. |
A 6.8 kΩ resistor, a 7 mH coil, and a 0.02 µF capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, RW, is 30 Ω. The equivalent parallel resistance, Rp(eq), is |
| A. | 1,878 Ω |
| B. | 18,780 Ω |
| C. | 18,750 Ω |
| D. | 626 Ω |
| Answer» C. 18,750 Ω | |
| 47. |
Assertion (A): In FM the frequency of the carrier is varied by the modulating voltageReason (R): FM and PM are two forms of angle modulation. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | A is wrong but R is correct |
| Answer» C. A is correct but R is wrong | |
| 48. |
In Modulation, “carrier” is |
| A. | Resultant wave |
| B. | Speech voltage to be transmitted |
| C. | Voltage with constant frequency, phase or amplitude |
| D. | Voltage for which frequency, phase or amplitude is varied |
| Answer» E. | |
| 49. |
Class AB operation is often used in power large signal) amplifiers in order to |
| A. | Get maximum efficiency |
| B. | Remove even harmonics |
| C. | Overcome a crossover distortion |
| D. | Reducing collector dissipation |
| Answer» D. Reducing collector dissipation | |
| 50. |
A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are |
| A. | 5 Ω & 20 % |
| B. | 25 Ω & 20 % |
| C. | 5 Ω & 16.7 % |
| D. | 25 Ω & 16.7 % |
| Answer» C. 5 Ω & 16.7 % | |