MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1085 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Divergence Theorem relates ________ integral to __________ integral. |
| A. | surface, volume |
| B. | line, surface |
| C. | volume, line |
| D. | all of these |
| Answer» B. line, surface | |
| 202. |
________ 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» C. Both (a) and (b) | |
| 203. |
Ampere's Circuital Law can be applied __________ the conductor. |
| A. | Inside |
| B. | Outside |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 204. |
If the rate at which field lines enter into a small volume and alsoleave, then divergence is ________. |
| A. | ∞ |
| B. | 1 |
| C. | −1 |
| Answer» D. | |
| 205. |
Conduction current through a wire is __________ displacementcurrent in capacitor. |
| A. | Same as |
| B. | Different from |
| C. | Twice of |
| D. | None of these |
| Answer» B. Different from | |
| 206. |
In a microstrip line, there is _________metal strip over the substrate. |
| A. | A thin |
| B. | A thick |
| C. | No |
| D. | None of these |
| Answer» B. A thick | |
| 207. |
Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant? |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» C. 150 | |
| 208. |
Transmission lines facilitate _________propagation of energy. |
| A. | Guided |
| B. | Unguided |
| C. | None of these |
| D. | Cannot say |
| Answer» B. Unguided | |
| 209. |
Spherical coordinates are represented in terms of ___________. |
| A. | (r, φ, z) |
| B. | (r, θ, φ) |
| C. | (x, y, z) |
| D. | all of these |
| Answer» C. (x, y, z) | |
| 210. |
Electric dipole is a pair of __________ and __________ point charges. |
| A. | Equal and same |
| B. | Unequal and same |
| C. | Equal and opposite |
| D. | Unequal and opposite |
| Answer» D. Unequal and opposite | |
| 211. |
The capacity of capacitor bank used in power factor correction isexpressed in terms of |
| A. | kW |
| B. | kVA |
| C. | kVAR |
| D. | volts |
| Answer» D. volts | |
| 212. |
For which of the following parameter variation, the capacitance of the capacitor remains unaffected? |
| A. | Distance between plates |
| B. | Area of the plates |
| C. | Nature of dielectric |
| D. | Thickness of the plates |
| Answer» E. | |
| 213. |
________ of two vectors uses the Law of Parallelogram. |
| A. | multiplication |
| B. | division |
| C. | addition |
| D. | all of these |
| Answer» D. all of these | |
| 214. |
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 | |
| 215. |
The electric field intensity at a point situated at 4 meters away from a point charge 200 N/C. if the distance is reduced to 2 meters, the field intensity will be. |
| A. | 400 N/C |
| B. | 600 N/C |
| C. | 800 N/C |
| D. | 1200 N/C |
| Answer» D. 1200 N/C | |
| 216. |
A capacitor stored 0.24 coulombs at 10 volts ,its capacitance is |
| A. | 0.024F |
| B. | 0.12 F |
| C. | 0.6 F |
| D. | 0.8 F |
| Answer» B. 0.12 F | |
| 217. |
Potential is _________ a perfect conductor. |
| A. | same inside |
| B. | infinite inside |
| C. | zero inside |
| D. | none of these |
| Answer» B. infinite inside | |
| 218. |
Dipole moment is _________ a right-hand screw, when it is moved inthe 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 | |
| 219. |
"The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed". The above statement is associated with |
| A. | Coulomb's square law |
| B. | Gauss's law |
| C. | Maxwell's first law |
| D. | Maxwell's second law |
| Answer» C. Maxwell's first law | |
| 220. |
Charge distribution symmetry can be of _______ type. |
| A. | Spherical |
| B. | Cylindrical |
| C. | Planar |
| D. | All of these |
| Answer» E. | |
| 221. |
A hole of radius b (b < a) is now drilled along the length of the wire at a distance d from the center of the wire as shown below. The magnetic field inside the hole is |
| A. | uniform and depends only on d |
| B. | uniform and depends only on b |
| C. | uniform and depends on both b and d |
| D. | non uniform |
| Answer» D. non uniform | |
| 222. |
Resonator cavities are used in _______. |
| A. | Klystron tubes |
| B. | Band-pass filters |
| C. | Wave meters |
| D. | All of these |
| Answer» E. | |
| 223. |
_______velocity is that whose resultant repeated reflected wavestravel down the guide. |
| A. | Medium |
| B. | Phase |
| C. | Group |
| D. | None of these |
| Answer» D. None of these | |
| 224. |
___________ product is governed by the Right-Hand Screw Rule. |
| A. | vector |
| B. | scalar |
| C. | simple mathematical |
| D. | none of these |
| Answer» B. scalar | |
| 225. |
If antenna array elemental spacing is large, then directivity willbe__________. |
| A. | Small |
| B. | More |
| C. | None of these |
| D. | Cannot say |
| Answer» C. None of these | |
| 226. |
The line of force due to charged particles are always |
| A. | Always straight |
| B. | Always curve |
| C. | Always circle |
| D. | None of the above |
| Answer» C. Always circle | |
| 227. |
If A.C. voltage is applied to capacititve circuit , th alternating currentcan 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 | |
| 228. |
Line integral involves _________ product. |
| A. | scalar |
| B. | vector |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» B. vector | |
| 229. |
According to __________ Law, induced current acts to produce anopposing flux. |
| A. | Bio–Savart's |
| B. | Lenz's |
| C. | Ampere's |
| D. | Faraday's |
| Answer» C. Ampere's | |
| 230. |
Displacement current density ____________ current passingthrough a capacitor. |
| A. | Represents |
| B. | Does not represent |
| C. | Is the same as |
| D. | None of these |
| Answer» C. Is the same as | |
| 231. |
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 | |
| 232. |
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» D. (λ + f) | |
| 233. |
Phase velocity is given as _________. |
| A. | ωβ |
| B. | βω |
| C. | β/ω |
| D. | None of these |
| Answer» D. None of these | |
| 234. |
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 | |
| 235. |
In good conductors, rate of attenuation is __________. |
| A. | Small |
| B. | Large |
| C. | Infinity |
| D. | Zero |
| Answer» D. Zero | |
| 236. |
In Cylindrical coordinate systems, unit vector ar is __________. |
| A. | directed outwards radially |
| B. | normal to cylindrical surface at a point |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 237. |
Electric flux density________medium. |
| A. | Depends on |
| B. | Independent of |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» C. Both (a) and (b) | |
| 238. |
Cylindrical coordinates are represented in terms of ____________. |
| A. | (r, φ, z) |
| B. | (r, θ, φ) |
| C. | (x, y, z) |
| D. | all of these |
| Answer» B. (r, θ, φ) | |
| 239. |
Which of the following is not a vector? |
| A. | Linear momentum |
| B. | Angular momentum |
| C. | Electric field |
| D. | Electric potential |
| Answer» B. Angular momentum | |
| 240. |
Lorentz force equation comprises __________ and __________ forces. |
| A. | Electric, magnetic |
| B. | Mechanical, chemical |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» B. Mechanical, chemical | |
| 241. |
Wave guides ________ in DC applications. |
| A. | Can also be used |
| B. | Cannot be used |
| C. | None of these |
| D. | Cannot say |
| Answer» C. None of these | |
| 242. |
A distortion less line has _________. |
| A. | Non-vanishing attenuation constant |
| B. | Constant velocity |
| C. | Constant real characteristic impedance |
| D. | All of these |
| Answer» E. | |
| 243. |
Cut-off wavelength λc in the TE10 mode is ____________. |
| A. | a |
| B. | 2a |
| C. | 4a |
| D. | 8a |
| Answer» C. 4a | |
| 244. |
In the Cylindrical coordinate system, z ranges between____________. |
| A. | 0 and 1 |
| B. | −∞ and 0 |
| C. | 0 and −∞ |
| D. | −∞ and ∞ |
| Answer» E. | |
| 245. |
In the case of a linear material medium, _________ equation can bederived easily from Gauss' law. |
| A. | Poisson |
| B. | Laplace |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 246. |
__________ gradient of magnetic scalar potential gives magnetic fieldintensity. |
| A. | Positive |
| B. | Negative |
| C. | Double |
| D. | Integral |
| Answer» C. Double | |
| 247. |
Metals have their conductivity "σ" _________. |
| A. | >>1 |
| B. | <<1 |
| C. | none of these |
| Answer» B. <<1 | |
| 248. |
Loss tangent is given as _________. |
| A. | σ/ωε |
| B. | ω/σε |
| C. | ωε/σ |
| D. | σε/ω |
| Answer» B. ω/σε | |
| 249. |
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° | |
| 250. |
A scalar field is harmonic in a given region, if its Laplacian is__________. |
| A. | ∞ |
| B. | −1 |
| C. | 1 |
| Answer» E. | |