McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering , Electronics and Communication Engineering .
| 101. |
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» B. Integral | |
| 102. |
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» D. Htan '1'− Htan '2' = Js | |
| 103. |
At the point of discontinuity, __________ component of magnetic flux density is continuous. |
| A. | Tangential |
| B. | Normal |
| C. | None of these |
| D. | Cannot say |
| Answer» B. Normal | |
| 104. |
For those surfaces where surface charge density is __________ normal component of electric flux density is continuous. |
| A. | Infinity |
| B. | Unity |
| C. | Zero |
| D. | None of these |
| Answer» C. Zero | |
| 105. |
Waves are used in __________. |
| A. | TV |
| B. | Radio |
| C. | Radar |
| D. | All of these |
| Answer» D. All of these | |
| 106. |
Displacement current density ____________ current passing through a capacitor. |
| A. | Represents |
| B. | Does not represent |
| C. | Is the same as |
| D. | None of these |
| Answer» B. Does not represent | |
| 107. |
Line integral of an electric field around a closed path is __________. |
| A. | infinity |
| B. | unity |
| C. | zero |
| D. | None of these |
| Answer» C. zero | |
| 108. |
__________ are caused by accelerated charges |
| A. | Time-varying fields |
| B. | Waves |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» C. Both (a) and (b) | |
| 109. |
At the Brewster angle, polarization ______________. |
| A. | Cannot be reflected |
| B. | Is reflected at 30° |
| C. | Is reflected at 90° |
| D. | None of these |
| Answer» A. Cannot be reflected | |
| 110. |
Wave number has units of____________. |
| A. | Radians |
| B. | Meter |
| C. | Radians/meter |
| D. | None of these |
| Answer» C. Radians/meter | |
| 111. |
Wave speed in terms of frequency f and wavelength λ is expressed as _________. |
| A. | f/λ |
| B. | λ/f |
| C. | λ f |
| D. | (λ + f) |
| Answer» C. λ f | |
| 112. |
For a lossy dielectric medium, ____________. |
| A. | σ = 0 |
| B. | σ ≠ 0 |
| C. | None of these |
| D. | Cannot say |
| Answer» B. σ ≠ 0 | |
| 113. |
Wave attenuation is given as ______________. |
| A. | e+βx |
| B. | e-βx |
| C. | e+αx |
| D. | e−αx |
| Answer» D. e−αx | |
| 114. |
In the case of a perfect dielectric medium, phase constant ______________ as conductivity increases. |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | None of these |
| Answer» A. Increases | |
| 115. |
Phase velocity is given as _________. |
| A. | ωβ |
| B. | βω |
| C. | β/ω |
| D. | None of these |
| Answer» C. β/ω | |
| 116. |
In good conductors, rate of attenuation is __________. |
| A. | Small |
| B. | Large |
| C. | Infinity |
| D. | Zero |
| Answer» C. Infinity | |
| 117. |
Power density has _________________. |
| A. | A DC component |
| B. | A second harmonic component |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» C. Both (a) and (b) | |
| 118. |
Reflection coefficient Γ is __________. |
| A. | ≥100 |
| B. | = 10 |
| C. | ≤ 1 |
| D. | None of these |
| Answer» C. ≤ 1 | |
| 119. |
Which of the following expressions is correct? |
| A. | (1 + Γ) = τ |
| B. | (1 + τ) = Γ |
| C. | (1 + Γ) τ = 0 |
| D. | (1 + τ)Γ = 0 |
| Answer» A. (1 + Γ) = τ | |
| 120. |
Standing wave consists of two travelling waves of ____________ amplitudes and _____________ is direction. |
| A. | Unequal, same |
| B. | Unequal, opposite |
| C. | Equal, same |
| D. | Equal, opposite |
| Answer» D. Equal, opposite | |
| 121. |
SNR ranges from ______. |
| A. | 0 to 1 |
| B. | 1 to 10 |
| C. | 10 to 100 |
| D. | 1 to ∞ |
| Answer» D. 1 to ∞ | |
| 122. |
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» C. Four | |
| 123. |
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» B. Lossless | |
| 124. |
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» C. 0 to ∞ | |
| 125. |
A family of arcs is obtained in the Smith chart by varying normalized reactance in a range of __________. |
| A. | −1 to 0 |
| B. | 0 to 1 |
| C. | 0 to ∞ |
| D. | −∞ to ∞ |
| Answer» D. −∞ to ∞ | |
| 126. |
Smith charts depict a wide impedance range of transmitter for _______VSWR. |
| A. | Low |
| B. | High |
| C. | Medium |
| D. | None of these |
| Answer» B. High | |
| 127. |
A cable or a wire is considered as a transmission line if its length is _________of the wavelength of the signal travelling through it. |
| A. | Greater than 1/10 |
| B. | Less than 1/10 |
| C. | Greater than 1/5 |
| D. | Less than 1/5 |
| Answer» A. Greater than 1/10 | |
| 128. |
Transmission lines facilitate _________propagation of energy. |
| A. | Guided |
| B. | Unguided |
| C. | None of these |
| D. | Cannot say |
| Answer» A. Guided | |
| 129. |
A transmission line is specified in terms of _________. |
| A. | R, G,L |
| B. | G, L,C |
| C. | R, G, L,C |
| D. | None of these |
| Answer» C. R, G, L,C | |
| 130. |
In planar transmission lines, C = _________. |
| A. | σ b/d |
| B. | μ d/b |
| C. | b/d |
| D. | None of these. |
| Answer» C. b/d | |
| 131. |
In a microstrip line, there is _________metal strip over the substrate. |
| A. | A thin |
| B. | A thick |
| C. | No |
| D. | None of these |
| Answer» A. A thin | |
| 132. |
In a fully lossless line, σ = _________. |
| A. | 0 |
| B. | 1 |
| C. | ∞ |
| D. | None of these. |
| Answer» C. ∞ | |
| 133. |
In a distortionless line, attenuation constant α is frequency _________. |
| A. | Dependent |
| B. | Independent |
| C. | None of these |
| D. | Cannot say |
| Answer» B. Independent | |
| 134. |
A distortion less line has _________. |
| A. | Non-vanishing attenuation constant |
| B. | Constant velocity |
| C. | Constant real characteristic impedance |
| D. | All of these |
| Answer» D. All of these | |
| 135. |
Voltage reflection coefficient is the ratio of _________ wave to _______ wave. |
| A. | Incident, reflected |
| B. | Reflected, incident |
| C. | Incident, absorbed |
| D. | Absorbed, incident |
| Answer» B. Reflected, incident | |
| 136. |
________ are very efficient in a frequency range of 3-300 GHz. |
| A. | Transmission line |
| B. | Wave guides |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» B. Wave guides | |
| 137. |
Wave guides ________ in DC applications. |
| A. | Can also be used |
| B. | Cannot be used |
| C. | None of these |
| D. | Cannot say |
| Answer» B. Cannot be used | |
| 138. |
Wave guides are a type of _________ filter. |
| A. | Low pass |
| B. | All pass |
| C. | Band pass |
| D. | High pass |
| Answer» D. High pass | |
| 139. |
For lossless wave guides, σc ________and σ ______ |
| A. | ∞, 0 |
| B. | 0, ∞ |
| C. | 0, 0 |
| D. | ∞, ∞ |
| Answer» A. ∞, 0 | |
| 140. |
In the TM mode, Ez _____ and Hz = ________. |
| A. | 0, 0 |
| B. | 0, ∞ |
| C. | ∞ 0 |
| D. | None of these |
| Answer» D. None of these | |
| 141. |
In the TEM mode, Ez ______ and Hz =_______ |
| A. | 0, 0 |
| B. | 0, ∞ |
| C. | ∞, 0 |
| D. | None of these |
| Answer» A. 0, 0 | |
| 142. |
Below the cut-off frequency, there is_______________. |
| A. | Attenuation |
| B. | No attenuation |
| C. | Amplification |
| D. | None of these. |
| Answer» A. Attenuation | |
| 143. |
Cut-off wavelength λc in the TE10 mode is ____________. |
| A. | a |
| B. | 2a |
| C. | 4a |
| D. | 8a |
| Answer» B. 2a | |
| 144. |
_______ 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» B. Phase | |
| 145. |
Information or energy through the wave guide travels at _______ velocity. |
| A. | Medium |
| B. | Phase |
| C. | Group |
| D. | None of these |
| Answer» C. Group | |
| 146. |
_______velocity is that whose resultant repeated reflected waves travel down the guide. |
| A. | Medium |
| B. | Phase |
| C. | Group |
| D. | None of these |
| Answer» C. Group | |
| 147. |
________ vector is needed to determine power flow in wave guides. |
| A. | Poynting |
| B. | Average Poynting |
| C. | Power |
| D. | Phase |
| Answer» B. Average Poynting | |
| 148. |
Surface current density K on wave guide walls for ______ is given as |
| A. | TM mode |
| B. | TE mode |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» C. Both (a) and (b) | |
| 149. |
At _______ frequencies, RLC resonant circuits are replaced by electromagnetic cavity resonators. |
| A. | Low |
| B. | Medium |
| C. | High |
| D. | None of these |
| Answer» C. High | |
| 150. |
Resonator cavities are used in _______. |
| A. | Klystron tubes |
| B. | Band-pass filters |
| C. | Wave meters |
| D. | All of these |
| Answer» D. All of these | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.