MCQOPTIONS
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MCQOPTIONS
This section includes 271 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics and Telecommunication Engineering [ENT knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Which of the following is not a strength member used in optical cable? |
| A. | steel wire |
| B. | germanium |
| C. | aramid yarns |
| D. | glass elements |
| Answer» C. aramid yarns | |
| 252. |
When the stranding approach consists of individual elements (e.g. single-fiber or multi fiber loose tube buffer) than the cable is termed as |
| A. | optical unit cable |
| B. | coaxial cable |
| C. | layer cable |
| D. | bare glass cable |
| Answer» D. bare glass cable | |
| 253. |
The primary function of the structural member is load bearing. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» C. | |
| 254. |
What is the Young’s modulus of Kevlar, an aromatic polyester? |
| A. | 9 ×1010nm-2 |
| B. | 10 ×1010nm-2 |
| C. | 12 ×1010nm-2 |
| D. | 13 ×1010nm-2 |
| Answer» E. | |
| 255. |
A measure of amount of optical fiber emitted from source that can be coupled into a fiber is termed as |
| A. | radiance |
| B. | angular power distribution |
| C. | coupling efficiency |
| D. | power-launching |
| Answer» D. power-launching | |
| 256. |
The ratio r = (n1 – n)/ (n1 – n) indicates |
| A. | fresnel reflection |
| B. | reflection coefficient |
| C. | refraction coefficient |
| D. | angular power distribution coefficient |
| Answer» C. refraction coefficient | |
| 257. |
The cable is normally covered with an outer plastic sheath to reduce _______________ |
| A. | abrasion |
| B. | armor |
| C. | friction |
| D. | dispersion |
| Answer» B. armor | |
| 258. |
A particular GaAs fiber has a Fresnel reflection magnitude of 17.6% i.e. 0.176. Find the power loss between the source and the fiber? |
| A. | 0.86 db |
| B. | 0.78 db |
| C. | 0.84 db |
| D. | 0.83 db |
| Answer» D. 0.83 db | |
| 259. |
How many types of misalignments occur when joining compatible fiber? |
| A. | one |
| B. | two |
| C. | five |
| D. | three |
| Answer» E. | |
| 260. |
Determine coupling efficiency if the misalignment loss in a graded index fiber is 0.102 |
| A. | 0.136 |
| B. | 0.898 |
| C. | 0.982 |
| D. | 0.684 |
| Answer» C. 0.982 | |
| 261. |
The expanded beam connectors use ____________ for beam expansion and reduction. |
| A. | square micro-lens |
| B. | oval micro-lens |
| C. | spherical micro-lens |
| D. | rectangular micro-lens |
| Answer» D. rectangular micro-lens | |
| 262. |
In a single mode fiber, the losses due to lateral offset and angular misalignment are given by 0.20 dB and 0.46 dB respectively. Find the total insertion loss |
| A. | 0.66 db |
| B. | 0.26 db |
| C. | 0.38 db |
| D. | 0.40 db |
| Answer» B. 0.26 db | |
| 263. |
The intrinsic loss through a multimode fiber joint is independent of direction of propagation. State whether the given statement is true or false |
| A. | true |
| B. | false |
| Answer» C. | |
| 264. |
Sapphire ball lens expanded beam design is successful than spherical lens coupled design. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 265. |
The fiber is positioned at the ________ of the lens in order to obtain a collimated beam and to minimize lens-to-lens longitudinal misalignment effects. |
| A. | aperture |
| B. | focal length |
| C. | curve |
| D. | exterior circumference |
| Answer» C. curve | |
| 266. |
The GRIN-rod lens can produce a collimated output beam with a divergent angle αof between _____________ from a light source situated on, or near to, the opposite lens face. |
| A. | 1 to 5 degrees |
| B. | 9 to 16 degrees |
| C. | 4 to 8 degrees |
| D. | 25 to 50 degrees |
| Answer» B. 9 to 16 degrees | |
| 267. |
In the given equation, if r is the radial distance, n is the refractive index; what does z stands for? |
| A. | focal length |
| B. | distance along the optical axis |
| C. | axial angle |
| D. | diameter |
| Answer» C. axial angle | |
| 268. |
The majority of the GRIN-rod lenses have diameters in the range of ____________ |
| A. | 2 to 2.5 mm |
| B. | 3 to 4 mm |
| C. | 0.1 to 0.4 mm |
| D. | 0.5 to 2 mm |
| Answer» E. | |
| 269. |
Which of the following factors does not cause divergence of the collimated beam from a GRIN-rod lens? |
| A. | lens cut length |
| B. | size of fiber core |
| C. | refractive index profile |
| D. | chromatic aberration |
| Answer» D. chromatic aberration | |
| 270. |
GRIN-rod lens connectors have loss characteristics which are independent of the modal power distribution in the fiber. State whether the given statement is true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 271. |
How many types of fiber splices are available? |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» C. three | |