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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.
| 51. |
The time constant and R-C circuit may also be defined as the time during which thecharging current falls to percent of its initial maximum value, |
| A. | 37 |
| B. | 42 |
| C. | 63 |
| D. | 73 |
| Answer» B. 42 | |
| 52. |
The input impedance of a quarter wave line 50 ohm and load impedance of20 ohm is |
| A. | 50 |
| B. | 20 |
| C. | 1000 |
| D. | 125 |
| Answer» E. | |
| 53. |
The transmission coefficient is given by 0.65. Find the return loss of thewave. |
| A. | 9.11 |
| B. | 1.99 |
| C. | 1.19 |
| D. | 9.91 |
| Answer» B. 1.99 | |
| 54. |
The total charge of a surface with densities 1,2,…,10 is |
| A. | 11 |
| B. | 33 |
| C. | 55 |
| D. | 77 |
| Answer» D. 77 | |
| 55. |
at R = 4m and σ = -3 at R = 5m. Find the flux density at R = 6m. |
| A. | 17/6 |
| B. | -17/6 |
| C. | 13/6 |
| D. | -13/6 |
| Answer» E. | |
| 56. |
Find the load impedance in a quarter line transformer with characteristicimpedance of 75 ohm and input impedance of 200 ohm. |
| A. | 28.125 |
| B. | 12.285 |
| C. | 52.185 |
| D. | 85.128 |
| Answer» B. 12.285 | |
| 57. |
πεh).aN. State True/False. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 58. |
The current reflection coefficient of a line with voltage reflection coefficient of0.65 is given by |
| A. | 0 |
| B. | 0.65 |
| C. | -0.65 |
| D. | 0.35 |
| Answer» D. 0.35 | |
| 59. |
The time constant of an R-C circuit is defined as the time during which capacitorcharging voltage actually rises to percent of its value. |
| A. | 37, initial |
| B. | 63.2, initial |
| C. | 63.2, final |
| D. | 37, final |
| Answer» D. 37, final | |
| 60. |
For an infinite transmission line, the characteristic impedance is given by 50ohm. Find the input impedance. |
| A. | 25 |
| B. | 100 |
| C. | 2500 |
| D. | 50 |
| Answer» E. | |
| 61. |
Find the characteristic impedance of a quarter wave with input and loadimpedances given by 50 and 25 respectively. |
| A. | 50 |
| B. | 25 |
| C. | 75 |
| D. | 35.35 |
| Answer» E. | |
| 62. |
Electric displacement is a quantity. |
| A. | scalar |
| B. | vector |
| C. | both of the above |
| D. | none of the above |
| Answer» C. both of the above | |
| 63. |
Those magnetic materials are best suited for making armature and transformer coreswhich have permeability and hystersis loss. |
| A. | high, high |
| B. | low, high |
| C. | high, low |
| D. | low, low |
| Answer» D. low, low | |
| 64. |
According to Faraday’s law, EMF stands for |
| A. | electromagnetic field |
| B. | electromagnetic force |
| C. | electromagnetic friction |
| D. | electromotive force |
| Answer» E. | |
| 65. |
The electromagnet has 50 turns and a current of 1A flows through the coil. If the lengthof the magnet circuit is 200 mm, what is the magnetic field strength ? |
| A. | 2500 at/m |
| B. | 250 at/m |
| C. | 25 at/m |
| D. | 2.5 at/m |
| Answer» C. 25 at/m | |
| 66. |
Find the divergence of the vector F= xe-x i + y j – xz k |
| A. | (1 – x)(1 + e-x) |
| B. | (x – 1)(1 + e-x) |
| C. | (1 – x)(1 – e) |
| D. | (x – 1)(1 – e) |
| Answer» B. (x – 1)(1 + e-x) | |
| 67. |
Find the receiving impedance of a transmission line having a voltage of 24Vand a conduction current of 1.2A is |
| A. | 25.2 |
| B. | 22.8 |
| C. | 28.8 |
| D. | 20 |
| Answer» E. | |
| 68. |
The input impedance of a half wave transmission line with a load impedanceof 12.5 ohm is |
| A. | 25 |
| B. | 50 |
| C. | 6.25 |
| D. | 12.5 |
| Answer» E. | |
| 69. |
The power of a wave of with voltage of 140V and a characteristic impedance of 50 ohmis |
| A. | 1.96 |
| B. | 19.6 |
| C. | 196 |
| D. | 19600 |
| Answer» D. 19600 | |
| 70. |
Given the vector potential is 16 – 12sin y j. Find the field intensity at the origin. |
| A. | 28 |
| B. | 16 |
| C. | 12 |
| D. | 4 |
| Answer» D. 4 | |
| 71. |
What is the potential difference between 10sinθcosφ/r2 at A(1,30,20) and B(4,90,60)? |
| A. | 2.386 |
| B. | 3.386 |
| C. | 4.386 |
| D. | 5.386 |
| Answer» D. 5.386 | |
| 72. |
When the ratio of load voltage to input voltage is 5, the ratio of thecharacteristic impedance to the input impedance is |
| A. | 1/5 |
| B. | 5 |
| C. | 10 |
| D. | 25 |
| Answer» C. 10 | |
| 73. |
at R = 4m and σ =-3 at R = 5m. Find the flux density at R = 4.5m. |
| A. | 4/4.5 |
| B. | 3/4.5 |
| C. | 2/4.5 |
| D. | 1/4.5 |
| Answer» D. 1/4.5 | |
| 74. |
The transmission coefficient in a wave travelling through two media havingintrinsic impedances of 5.5 and 1.33 is |
| A. | 0.389 |
| B. | 0.55 |
| C. | 0.133 |
| D. | 0.42 |
| Answer» B. 0.55 | |
| 75. |
The reflection coefficient of a transmission line having characteristic and loadimpedances as 50 and 30 ohm respectively is |
| A. | 1/4 |
| B. | 1/8 |
| C. | 1/2 |
| D. | 3/4 |
| Answer» B. 1/8 | |
| 76. |
The incident wave amplitude is 24 units. Find the reflected wave amplitude ifthe reflection coefficient is 0.6. |
| A. | 14.4 |
| B. | 16.6 |
| C. | 13.3 |
| D. | 11.1 |
| Answer» B. 16.6 | |
| 77. |
Find the potential of the function V = 60cos θ/r at the point P(3, 60, 25). |
| A. | 20 |
| B. | 10 |
| C. | 30 |
| D. | 60 |
| Answer» C. 30 | |
| 78. |
When a transmission line has a load impedance same as that of thecharacteristic impedance, the line is said to be |
| A. | parallel |
| B. | perpendicular |
| C. | polarized |
| D. | matched |
| Answer» E. | |
| 79. |
The power of the electromagnetic wave with electric and magnetic fieldintensities given by 12 and 15 respectively is |
| A. | 180 |
| B. | 90 |
| C. | 45 |
| D. | 120 |
| Answer» C. 45 | |
| 80. |
Given that R = 20 ohm, L = 40 mH, C = 40 μF, G = 0.02 mho. Find whetherthe 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 | |
| 81. |
The centre of the point having a normalised resistance of 1.2 ohm andreactance of 1.5 ohm is |
| A. | (0.54,0) |
| B. | (0.45,0) |
| C. | (0.36,0) |
| D. | (0.78,0) |
| Answer» B. (0.45,0) | |
| 82. |
The transmission coefficient in a wave travelling through two media havingpermittivities 4 and 1 is |
| A. | 1/4 |
| B. | 3/2 |
| C. | 3/4 |
| D. | 2/3 |
| Answer» E. | |
| 83. |
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectionalarea of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ? |
| A. | 63.38 n/wb |
| B. | 633.8 n/wb |
| C. | 6338 n/wb |
| D. | 63380 n/wb |
| Answer» D. 63380 n/wb | |
| 84. |
kV. Find „a‟. |
| A. | 1m |
| B. | 1cm |
| C. | 10cm |
| D. | 1mm |
| Answer» E. | |
| 85. |
When the length of the transmission line is same as that of the wavelength,then which condition holds good? |
| A. | zin = zo |
| B. | z = zo |
| C. | zl = zo |
| D. | zin = zl |
| Answer» E. | |
| 86. |
The characteristic impedance of a transmission line with impedance andadmittance of 16 and 9 respectively is |
| A. | 25 |
| B. | 1.33 |
| C. | 7 |
| D. | 0.75 |
| Answer» C. 7 | |
| 87. |
The reflection coefficient of a wave travelling through two media havingpermittivities 4 and 9 respectively is |
| A. | 0 |
| B. | 0.5 |
| C. | 0.25 |
| D. | 0.2 |
| Answer» E. | |
| 88. |
A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be |
| A. | 0.48 N-m |
| B. | 4.8 N-m |
| C. | 0.0048 N-m |
| D. | 0.048 N-m |
| Answer» E. | |
| 89. |
The simplest kind of capacitor is ________ |
| A. | ceramic capacitor |
| B. | electrolyte capacitor |
| C. | tuning capacitor |
| D. | paper capacitor |
| Answer» E. | |
| 90. |
Paper capacitor is a type of _________ |
| A. | fixed capacitor |
| B. | variable capacitor |
| C. | either fixed or variable depending on its usage |
| D. | neither fixed nor variable |
| Answer» B. variable capacitor | |
| 91. |
Displacement current depends on ___________ |
| A. | moving charges |
| B. | change in time |
| C. | both moving charges and change in time |
| D. | neither moving charges nor change in time |
| Answer» C. both moving charges and change in time | |
| 92. |
In a variable capacitor, capacitance can be varied by ______ |
| A. | turning the rotatable plates in or out |
| B. | sliding the rotatable plates |
| C. | changing the plates |
| D. | changing the material of plates |
| Answer» B. sliding the rotatable plates | |
| 93. |
Leakage in capacitors is primarily caused by _________ |
| A. | transistors |
| B. | resistors |
| C. | inductors |
| D. | dc motors |
| Answer» B. resistors | |
| 94. |
The flow of electrons in dielectric is due to _________ |
| A. | conduction |
| B. | potential difference |
| C. | breakdown |
| D. | resistance |
| Answer» D. resistance | |
| 95. |
m, calculate the dielectric strength. |
| A. | 2mv/m |
| B. | 4mv/m |
| C. | 6mv/m |
| D. | 8mv/m |
| Answer» B. 4mv/m | |
| 96. |
The unit for dielectric strength is ____________ |
| A. | v/m2 |
| B. | mv/m2 |
| C. | mv/m |
| D. | vm |
| Answer» D. vm | |
| 97. |
kV. Find „a‟. |
| A. | 10mm |
| B. | 100mm |
| C. | 1000m |
| D. | 1000cm |
| Answer» E. | |
| 98. |
kV. |
| A. | 350n |
| B. | 0.035kn |
| C. | 0.035n |
| D. | 3.35kn |
| Answer» D. 3.35kn | |
| 99. |
in air. |
| A. | 1.41 |
| B. | 3.5 |
| C. | 2.2 |
| D. | 1.73 |
| Answer» E. | |
| 100. |
units and E = 8 units. |
| A. | 1.77 |
| B. | 2.25 |
| C. | 36 |
| D. | 144 |
| Answer» D. 144 | |