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MCQOPTIONS
This section includes 682 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. |
A single core cable used on 33000 V has conductor diameter 10 mm and the in ternal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is |
| A. | 62 x 105 v/m |
| B. | 72 x 105 v/m |
| C. | 82 x 105 v/m |
| D. | 92 x 105 v/m |
| Answer» C. 82 x 105 v/m | |
| 2. |
A capacitor in a circuit became hot and ultimately exploded due to wrong con nections, which type of capacitor it could be ? |
| A. | paper capacitor |
| B. | ceramic capacitor |
| C. | electrolytic capacitor |
| D. | any-of the above |
| Answer» D. any-of the above | |
| 3. |
A capacitance of 100 fiF is connected in series with a resistance of 8000 2. The time constant of the circuit is |
| A. | 0.2 s |
| B. | 0.4 s |
| C. | 0.6 s |
| D. | 0.8 s |
| Answer» E. | |
| 4. |
A conductor carries 125 amperes of current under 60 to a magnetic field of 1.1 tesla. The force on the conductor will be nearly |
| A. | 50 n |
| B. | 120 n |
| C. | 240 n |
| D. | 480 n |
| Answer» C. 240 n | |
| 5. |
Electric field of an infinitely long conductor of charge density , is given by E = /(2 h).aN. State True/False |
| A. | true |
| B. | false |
| Answer» B. false | |
| 6. |
Find the permittivity of the surface when a wave incident at an angle 60 is reflected by the surface at 45 in air |
| A. | 1.41 |
| B. | 3.5 |
| C. | 2.2 |
| D. | 1.73 |
| Answer» E. | |
| 7. |
Given that R = 20 ohm, L = 40 mH, C = 40 F, G = 0.02 mho. Find whether the line is distortionless or not. |
| A. | distorted line |
| B. | distortionless line |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» C. all of the mentioned | |
| 8. |
If V = 2x2y – 5z, find its electric field at point (-4,3,6) |
| A. | 47.905 |
| B. | 57.905 |
| C. | 67.905 |
| D. | 77.905 |
| Answer» C. 67.905 | |
| 9. |
Calculate the transmission coefficient, when the incident and transmittedamplitudes are 10 and 7 respectively. |
| A. | 17 |
| B. | 3 |
| C. | 10/7 |
| D. | 0.7 |
| Answer» E. | |
| 10. |
The power of the electromagnetic wave with electric and magnetic field intensities givenby 12 and 15 respectively is |
| A. | 180 |
| B. | 90 |
| C. | 45 |
| D. | 120 |
| Answer» C. 45 | |
| 11. |
Find the force due to a current element of length 2cm and flux density of 12 tesla. Thecurrent through the element will be 5A. |
| A. | 1 n |
| B. | 1.2 n |
| C. | 1.4 n |
| D. | 1.6 n |
| Answer» C. 1.4 n | |
| 12. |
Which of the following parameters does not exist in the transmission lineequation? |
| A. | r |
| B. | zo |
| C. | zl |
| D. | propagation constant |
| Answer» B. zo | |
| 13. |
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm,the force per metre of length of each conductor will be |
| A. | 100 n |
| B. | 10 n |
| C. | 1 n |
| D. | 0.1 n |
| Answer» E. | |
| 14. |
Find the Maxwell equation derived from Faraday’s law. |
| A. | div(h) = j |
| B. | div(d) = i |
| C. | curl(e) = -db/dt |
| D. | curl(b) = -dh/dt |
| Answer» D. curl(b) = -dh/dt | |
| 15. |
5cm apart in transformer oil(εr=2.2) in 10-4 N, |
| A. | 8.15 |
| B. | 5.18 |
| C. | 1.518 |
| D. | 1.815 |
| Answer» E. | |
| 16. |
Find the conductivity of a material with conduction current density 100 units and electricfield of 4 units. |
| A. | 25 |
| B. | 400 |
| C. | 0.04 |
| D. | 1600 |
| Answer» B. 400 | |
| 17. |
The intrinsic impedance of a wave with electric and magnetic field of 10 and8 respectively is |
| A. | 1.6 |
| B. | 1.11 |
| C. | 1.25 |
| D. | 0.8 |
| Answer» C. 1.25 | |
| 18. |
i in spherical coordinates with r = 4m and θ = π/2. |
| A. | 600 |
| B. | 599.8 |
| C. | 588.9 |
| D. | 577.8 |
| Answer» D. 577.8 | |
| 19. |
The propagation constant of a wave with attenuation and phase constantgiven by 2 and 3 respectively is |
| A. | 2 – 3j |
| B. | 3 – 2j |
| C. | 2 + 3j |
| D. | 3 + 2j |
| Answer» D. 3 + 2j | |
| 20. |
πε) ln(b/a). State True/False. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 21. |
Evaluate Gauss law for D = 5r2/4 i in spherical coordinates with r = 4m and θ = π/2. |
| A. | 600 |
| B. | 599.8 |
| C. | 588.9 |
| D. | 577.8 |
| Answer» D. 577.8 | |
| 22. |
Electric field intensity due to infinite sheet of charge σ is |
| A. | zero |
| B. | unity |
| C. | σ/ε |
| D. | σ/2ε |
| Answer» E. | |
| 23. |
The frequency of a wave travelling in a transmission line with velocity 4 x 108and wavelength 3 units is |
| A. | 0.75 ghz |
| B. | 0.133 ghz |
| C. | 7.5 ghz |
| D. | 1.33 ghz |
| Answer» C. 7.5 ghz | |
| 24. |
Find the characteristic impedance expression in terms of the inductance andcapacitance parameters. |
| A. | zo = √(lc) |
| B. | zo = lc |
| C. | zo = √(l/c) |
| D. | zo = l/c |
| Answer» D. zo = l/c | |
| 25. |
The divergence concept can be illustrated using Pascal’s law. State True/False. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 26. |
at R = 4m and σ = -3 at R = 5m. Find the flux density at R = 3m. |
| A. | 3 |
| B. | 10/3 |
| C. | 11/3 |
| D. | 4 |
| Answer» C. 11/3 | |
| 27. |
Find the charge density from the function of flux density given by 12x – 7z. |
| A. | 19 |
| B. | -5 |
| C. | 5 |
| D. | -19 |
| Answer» D. -19 | |
| 28. |
The work done by a charge of 10μC with a potential 4.386 is (in μJ) |
| A. | 32.86 |
| B. | 43.86 |
| C. | 54.68 |
| D. | 65.68 |
| Answer» C. 54.68 | |
| 29. |
at R = 4m and σ = -3 at R = 5m. Find the flux density at R = 1m. |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 30. |
Coulomb’s law can be derived from Gauss law. State True/ False |
| A. | true |
| B. | false |
| Answer» B. false | |
| 31. |
The incident and the reflected voltage are given by 15 and 5 respectively. Thetransmission coefficient is |
| A. | 1/3 |
| B. | 2/3 |
| C. | 1 |
| D. | 3 |
| Answer» C. 1 | |
| 32. |
Those materials are well suited for making permanent magnets whichhave retentivity and coercivity. |
| A. | low, high |
| B. | high, high |
| C. | high, low |
| D. | low, low |
| Answer» C. high, low | |
| 33. |
A charge located at point p (5,30⁰,2) is said to be in which coordinate system? |
| A. | cartesian system |
| B. | cylindrical system |
| C. | spherical system |
| D. | space system |
| Answer» C. spherical system | |
| 34. |
The skin depth of the wave having a frequency of 3MHz and a velocity of 12m/s is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 35. |
The value of ∫ H.dL will be |
| A. | j |
| B. | i |
| C. | b |
| D. | h |
| Answer» C. b | |
| 36. |
Find the Cartesian coordinates of B(4,25⁰,120⁰) |
| A. | (0.845, 1.462, 3.625) |
| B. | (-0.845, 1.462, 3.625) |
| C. | (-8.45, 2.462, 6.325) |
| D. | (8.45, 2.462, 6.325) |
| Answer» C. (-8.45, 2.462, 6.325) | |
| 37. |
Transform the vector A = 3i – 2j – 4k at P(2,3,3) to cylindrical coordinates |
| A. | -3.6j – 4k |
| B. | -3.6j + 4k |
| C. | 3.6j – 4k |
| D. | 3.6j + 4k |
| Answer» B. -3.6j + 4k | |
| 38. |
When the conduction current density and displacement current density are same, thedissipation factor will be |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | unity |
| Answer» E. | |
| 39. |
In which of the following forms can Maxwell’s equation not be represented? |
| A. | static |
| B. | differential |
| C. | integral |
| D. | harmonic |
| Answer» B. differential | |
| 40. |
Find the standing wave ratio, when a load impedance of 250 ohm isconnected to a 75 ohm line. |
| A. | 0.3 |
| B. | 75 |
| C. | 250 |
| D. | 3.33 |
| Answer» E. | |
| 41. |
The normalised load impedance of the transmission line 50 ohm with a loadof 30 ohm is |
| A. | 30 |
| B. | 150 |
| C. | 5/3 |
| D. | 3/5 |
| Answer» E. | |
| 42. |
The power reflected by a wave with incident power of 16 units is(Given that thereflection coefficient is 0.5) |
| A. | 2 |
| B. | 8 |
| C. | 6 |
| D. | 4 |
| Answer» E. | |
| 43. |
Which primary parameter is uniformly distributed along the length of theconductor? |
| A. | g |
| B. | c |
| C. | l |
| D. | r |
| Answer» E. | |
| 44. |
Find the potential of V = 60sin θ/r2 at P(3,60,25) |
| A. | 5.774 |
| B. | 6.774 |
| C. | 7.774 |
| D. | 8.774 |
| Answer» B. 6.774 | |
| 45. |
The networks in which the R, L, C parameters are individually concentrated orlumped at discrete points in the circuit are called |
| A. | lumped |
| B. | distributed |
| C. | parallel |
| D. | paired |
| Answer» B. distributed | |
| 46. |
The characteristic impedance of a quarter wave transformer with load andinput impedances given by 30 and 75 respectively is |
| A. | 47.43 |
| B. | 37.34 |
| C. | 73.23 |
| D. | 67.45 |
| Answer» B. 37.34 | |
| 47. |
Two infinitely long parallel conductors in vacuum anf' separated 1 metre betweencentres >rhen a current of 1 ampere flows thn. ugh each conductor, produce on each otLer a force of |
| A. | 2 x 1(t2 n/m) |
| B. | 2 x kt3 n/m |
| C. | 2 x 10"5 n/m |
| D. | 2x 1(t7 n/m) |
| Answer» E. | |
| 48. |
Given B= (10/r)i+( rcos θ) j+k in spherical coordinates. Find Cartesian points at (-3,4,0) |
| A. | -2i + j |
| B. | 2i + k |
| C. | i + 2j |
| D. | –i – 2k |
| Answer» B. 2i + k | |
| 49. |
The maxima and minima voltage of the standing wave are 6 and 2respectively. The standing wave ratio is |
| A. | 2 |
| B. | 3 |
| C. | 1/2 |
| D. | 4 |
| Answer» C. 1/2 | |
| 50. |
Find the reflection coefficient of the wave passing through two media havingintrinsic impedances of 4 and 9 respectively. |
| A. | 0.5 |
| B. | 1 |
| C. | 0.38 |
| D. | 0.1 |
| Answer» D. 0.1 | |