MCQOPTIONS
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MCQOPTIONS
This section includes 67 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. |
If two vectors are orthogonal, then their scalar product is __________. |
| A. | 1 |
| B. | 0 |
| C. | |
| D. | 100 |
| Answer» C. | |
| 2. |
Another boundary condition using Maxwell's equations is given as __________. |
| A. | Htan '1' + Htan '2' = 0 |
| B. | Htan '1' Htan '2' = 0 |
| C. | Htan '1' + Htan '2' = Js |
| D. | Htan '1' Htan '2' = Js |
| Answer» E. | |
| 3. |
In a Cartesian coordinate system, axes x, y and z are at __________ to each other. |
| A. | 45 |
| B. | 90 |
| C. | 120 |
| D. | 180 |
| Answer» C. 120 | |
| 4. |
'r' in Cylindrical coordinates corresponding to Cartesian coordinate (3, 4, 5) is ____________. |
| A. | 12 |
| B. | 7 |
| C. | 10 |
| D. | 5 |
| Answer» E. | |
| 5. |
Cylindrical coordinate 'z' is related to the Cartesian coordinate as __________. |
| A. | tan 1(y/x) |
| B. | z |
| C. | xy/z |
| D. | cot z |
| Answer» C. xy/z | |
| 6. |
Cylindrical coordinate 'r' is related to the Cartesian coordinate as __________. |
| A. | (x, y) |
| B. | (x + y) |
| C. | (x2/y2) |
| D. | (x2 + y2)1/2 |
| Answer» E. | |
| 7. |
The sparking between two electrical contacts can be reduced by inserting a |
| A. | Capacitor in parallel with contacts |
| B. | Capacitor in series with each contact |
| C. | Resistance in line |
| D. | None of the above |
| Answer» B. Capacitor in series with each contact | |
| 8. |
In the case of an ideal isotropic antenna, the geometric radiation pattern is___________. |
| A. | Circle |
| B. | Sphere |
| C. | Parabola |
| D. | Hyperbola |
| Answer» C. Parabola | |
| 9. |
If antenna array elemental spacing is large, then directivity will be__________. |
| A. | Small |
| B. | More |
| C. | None of these |
| D. | Cannot say |
| Answer» C. None of these | |
| 10. |
If antenna directivity and antenna gain are equal, then antenna efficiency is __________%. |
| A. | 20 |
| B. | 50 |
| C. | 75 |
| D. | 100 |
| Answer» E. | |
| 11. |
In__________array, radiation is in the same direction as the array orientation. |
| A. | Broadside |
| B. | End fire |
| C. | None of these |
| D. | Cannot say |
| Answer» E. | |
| 12. |
The force between two charges is 120 N. if the distance between the charge is doubled, the force will be |
| A. | 60 N |
| B. | 30 N |
| C. | 40 N |
| D. | 15 N |
| Answer» C. 40 N | |
| 13. |
Dipole moment is _________ a right-hand screw, when it is moved in the current's direction in a current loop. |
| A. | orthogonal to the direction of |
| B. | opposite to the direction of |
| C. | in the direction of |
| D. | none of these |
| Answer» D. none of these | |
| 14. |
As per Gauss' Law, charge density inside a perfect conductor is zero if E is _________. |
| A. | positive |
| B. | negative |
| C. | unity |
| D. | zero |
| Answer» E. | |
| 15. |
For a medium to be a quasi-conductor, the dissipation factor should be _________. |
| A. | infinity |
| B. | zero |
| C. | unity |
| D. | none of these |
| Answer» D. none of these | |
| 16. |
The ability of charged bodies to exert force on any another is attributed to the existence of |
| A. | Electrons |
| B. | Protons |
| C. | Neutrons |
| D. | Electric field |
| Answer» D. Electric field | |
| 17. |
The electrostatic force between two charges of one coulomb each and placed at distance of 0.5 m will be |
| A. | 36 x 10fa |
| B. | 36 x 107 N |
| C. | 36 x 108 N |
| D. | 36 x 109 N |
| Answer» E. | |
| 18. |
The ability of charged bodies to exert force on 6ne another is attributed to the existence of |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | electric field |
| Answer» E. | |
| 19. |
The Smith chart represents a family of circles obtained by varying normalized resistance in the range of __________. |
| A. | 1 to 0 |
| B. | 0 to 1 |
| C. | 0 to |
| D. | to |
| Answer» D. to | |
| 20. |
The Smith chart is a ________ dimensional representation of complex impedances with respect to coordinates. |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | None of these |
| Answer» D. None of these | |
| 21. |
At _______ frequencies, RLC resonant circuits are replaced by electromagnetic cavity resonators. |
| A. | Low |
| B. | Medium |
| C. | High |
| D. | None of these |
| Answer» D. None of these | |
| 22. |
Gradient represents the __________ of maximum space rate of increase of a scalar field. |
| A. | magnitude |
| B. | direction |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» D. none of these | |
| 23. |
A scalar field is harmonic in a given region, if its Laplacian is __________. |
| A. | |
| B. | 1 |
| C. | 1 |
| D. | 0 |
| Answer» E. | |
| 24. |
Potential energy _____ if a test charge is moved from a lower potential point to a higher potential point. |
| A. | Remains the same |
| B. | Increases |
| C. | Decreases |
| D. | Becomes zero |
| Answer» C. Decreases | |
| 25. |
The capacity of capacitor bank used in power factor correction is expressed in terms of |
| A. | kW |
| B. | kVA |
| C. | kVAR |
| D. | volts |
| Answer» D. volts | |
| 26. |
Voltage reflection coefficient is the ratio of _________ wave to _______ wave. |
| A. | Incident, reflected |
| B. | Reflected, incident |
| C. | Incident, absorbed |
| D. | Absorbed, incident |
| Answer» C. Incident, absorbed | |
| 27. |
In a distortionless line, attenuation constant is frequency _________. |
| A. | Dependent |
| B. | Independent |
| C. | None of these |
| D. | Cannot say |
| Answer» C. None of these | |
| 28. |
Which of the following materials has the highest value of dielectric constant? |
| A. | Glass |
| B. | Vacuum |
| C. | Ceramics |
| D. | Oil |
| Answer» D. Oil | |
| 29. |
If the rate at which field lines enter into a small volume and also leave, then divergence is ________. |
| A. | |
| B. | 1 |
| C. | 0 |
| D. | 1 |
| Answer» D. 1 | |
| 30. |
Divergence Theorem is applicable for a ________ that is bounded by a _________. |
| A. | volume, surface |
| B. | surface, volume |
| C. | surface, line |
| D. | line, surface |
| Answer» B. surface, volume | |
| 31. |
Information or energy through the wave guide travels at _______ velocity. |
| A. | Medium |
| B. | Phase |
| C. | Group |
| D. | None of these |
| Answer» D. None of these | |
| 32. |
If A.C. voltage is applied to capacititve circuit , th alternating current can flow in the circuit because |
| A. | Varying voltage produces the charging and discharging currents |
| B. | Of high peak value |
| C. | Discharge current can flow |
| D. | Charging current can flow |
| Answer» B. Of high peak value | |
| 33. |
Capacitors are used for audio frequency and radio frequency coupling and tuning. |
| A. | Air |
| B. | Mica |
| C. | Plastic film |
| D. | Ceramic |
| Answer» C. Plastic film | |
| 34. |
Which of the following capacitors will have the least value of breakdown voltage ? |
| A. | Mica |
| B. | Paper |
| C. | Ceramic |
| D. | Electrolytic |
| Answer» E. | |
| 35. |
Which of the following capacitors can be used for temperature compensation ? |
| A. | Air capacitor |
| B. | Ceramic capacitor |
| C. | Paper capacitor |
| D. | None of the above |
| Answer» C. Paper capacitor | |
| 36. |
In a _________ transmission line, the reflection coefficient domain is a circle of unitary radius. |
| A. | Lossy |
| B. | Lossless |
| C. | None of these |
| D. | Cannot say |
| Answer» C. None of these | |
| 37. |
If three 15 uf capacitors are connected in series , the net capacitance is |
| A. | 5uf |
| B. | 30 Ue |
| C. | 40 uF |
| D. | 50 UF |
| Answer» B. 30 Ue | |
| 38. |
For transformation from the Cartesian coordinate system to Spherical coordinate system, ap should be equal to ____________. |
| A. | cos |
| B. | cos |
| C. | sin |
| D. | sin |
| Answer» B. cos | |
| 39. |
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of |
| A. | 2 joules |
| B. | 4 joules |
| C. | 6 joules |
| D. | 8 joules |
| Answer» E. | |
| 40. |
In the case of a linear material medium, _________ equation can be derived easily from Gauss' law. |
| A. | Poisson |
| B. | Laplace |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 41. |
In terms of Spherical coordinate system variables, y of Cartesian coordinate system is given as __________. |
| A. | r sin cos |
| B. | r sin sin |
| C. | r cos sin |
| D. | r cos cos |
| Answer» C. r cos sin | |
| 42. |
is that property of a capacitor which delays any change of voltage across it. |
| A. | Inductance |
| B. | Capacitance |
| C. | Potential gradient |
| D. | None of the above |
| Answer» C. Potential gradient | |
| 43. |
_______velocity is that whose resultant repeated reflected waves travel down the guide. |
| A. | Medium |
| B. | Phase |
| C. | Group |
| D. | None of these |
| Answer» D. None of these | |
| 44. |
Magnetization volume current density in magnetic materials is due to __________. |
| A. | Applied non-uniform magnetic field |
| B. | Non-uniform magnetic susceptibility of material |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 45. |
Maxwell's equations in __________ form give unformation at points of discontinuity in electromagnetic fields. |
| A. | Differential |
| B. | Integral |
| C. | Algebraic |
| D. | None of these |
| Answer» C. Algebraic | |
| 46. |
According to __________ Law, induced current acts to produce an opposing flux. |
| A. | Bio Savart's |
| B. | Lenz's |
| C. | Ampere's |
| D. | Faraday's |
| Answer» C. Ampere's | |
| 47. |
Ampere's Circuital Law is analogous to __________ Law in electrostatics. |
| A. | Lenz's |
| B. | Gauss's |
| C. | Biot Savart's |
| D. | Faraday's |
| Answer» C. Biot Savart's | |
| 48. |
Conduction current through a wire is __________ displacement current in capacitor. |
| A. | Same as |
| B. | Different from |
| C. | Twice of |
| D. | None of these |
| Answer» B. Different from | |
| 49. |
Displacement current density ____________ current passing through a capacitor. |
| A. | Represents |
| B. | Does not represent |
| C. | Is the same as |
| D. | None of these |
| Answer» C. Is the same as | |
| 50. |
_______ velocity is the one at which loss of constant phase propagates down the guide. |
| A. | Medium |
| B. | Phase |
| C. | Group |
| D. | None of these |
| Answer» C. Group | |