MCQOPTIONS
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MCQOPTIONS
This section includes 259 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
A permanent joint formed between two different optical fibers in the field is known as a |
| A. | fiber splice |
| B. | fiber connector |
| C. | fiber attenuator |
| D. | fiber dispersion |
| Answer» B. fiber connector | |
| 102. |
2 dB along with a splice loss of 0.1 dB at the interconnection of each stage. Determine the excess loss. |
| A. | 1.9 db |
| B. | 1.4 db |
| C. | 0.9 db |
| D. | 1.1 db |
| Answer» E. | |
| 103. |
Calculate the splitting loss if a 30×30 port multimode fiber star coupler has 1 mW of optical power launched into an input port. |
| A. | 13 db |
| B. | 15 db |
| C. | 14.77 db |
| D. | 16.02 db |
| Answer» D. 16.02 db | |
| 104. |
A Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output. |
| A. | star |
| B. | ladder |
| C. | wdm |
| D. | three-port |
| Answer» B. ladder | |
| 105. |
How many manufacturing methods are used for producing multimode fiber star couplers? |
| A. | two |
| B. | one |
| C. | three |
| D. | five |
| Answer» B. one | |
| 106. |
The measured output power at ports 2,3 and 4 are 0.003, 23.0 and 24.5 μW respectively. Determine the excess loss. |
| A. | 0.22 db |
| B. | 0.33 db |
| C. | 0.45 db |
| D. | 0.12 db |
| Answer» B. 0.33 db | |
| 107. |
Which is the most common method for manufacturing couplers? |
| A. | wavelength division multiplexing |
| B. | lateral offset method |
| C. | semitransparent mirror method |
| D. | fused bi-conical taper (fbt) technique |
| Answer» E. | |
| 108. |
Couplers insertion loss is same as that of excess loss. |
| A. | true |
| B. | false |
| Answer» C. | |
| 109. |
How many fabrication techniques are used for 3 port fiber couplers? |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» C. three | |
| 110. |
                 couplers combine the different wavelength optical signal onto the fiber or separate the different wavelength optical signal output from the fiber. |
| A. | 3-port |
| B. | 2*2-star |
| C. | wdm |
| D. | directional |
| Answer» D. directional | |
| 111. |
The optical power coupled from one fiber to another is limited by |
| A. | numerical apertures of fibers |
| B. | varying refractive index of fibers |
| C. | angular power distribution at source |
| D. | number of modes propagating in each fiber |
| Answer» E. | |
| 112. |
How many types of multiport optical fiber couplers are available at present? |
| A. | two |
| B. | one |
| C. | four |
| D. | three |
| Answer» E. | |
| 113. |
It is a device that distributes light from a main fiber into one or more branch fibers. |
| A. | optical fiber coupler |
| B. | optical fiber splice |
| C. | optical fiber connector |
| D. | optical isolator |
| Answer» B. optical fiber splice | |
| 114. |
Optical fiber couplers are also called as |
| A. | isolators |
| B. | circulators |
| C. | directional couplers |
| D. | attenuators |
| Answer» D. attenuators | |
| 115. |
When considering source-to-fiber coupling efficiencies, the                  is an important parameter than total output power. |
| A. | numerical aperture |
| B. | radiance of an optical source |
| C. | coupling efficiency |
| D. | angular power distribution |
| Answer» C. coupling efficiency | |
| 116. |
Optical time domain reflectometry is also called a backscatter measurement method. |
| A. | false |
| B. | true |
| Answer» C. | |
| 117. |
A large-area photodiode is utilized in the receiver to eliminate any effects from differing fiber and faces. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 118. |
                           may be used for measurement of the absolute optical attenuation on a fiber link. |
| A. | silicon photodiodes |
| B. | ingaasp photodiodes |
| C. | optical power meters |
| D. | gyrators |
| Answer» D. gyrators | |
| 119. |
The handheld optical power meter has a measurement accuracy of |
| A. | 0.01 db |
| B. | 0.25 db |
| C. | 0.8 db |
| D. | 1 db |
| Answer» C. 0.8 db | |
| 120. |
Which sensors are used for alteration of spectral range in equipment? |
| A. | wide-area photodiodes |
| B. | circulators |
| C. | gyrators |
| D. | photogenic sensors |
| Answer» B. circulators | |
| 121. |
Which of the following cannot be used in equipment for field measurements? |
| A. | fiber |
| B. | connector |
| C. | external triggering |
| D. | environmental factor |
| Answer» D. environmental factor | |
| 122. |
Which of the following are not considered as environmental conditions required for field measurements? |
| A. | temperature |
| B. | humidity |
| C. | mechanical load |
| D. | power |
| Answer» E. | |
| 123. |
In case of field measurements, the equipment must have                        power consumption keeping in mind the battery operation. |
| A. | low |
| B. | high |
| C. | negligible |
| D. | maximum |
| Answer» B. high | |
| 124. |
                         affects both the fiber attenuation and dispersion. |
| A. | refractive index |
| B. | micro-bending |
| C. | connectors |
| D. | splices |
| Answer» C. connectors | |
| 125. |
                         is also known as frequency- shaping filter. |
| A. | resonator |
| B. | amplifiers |
| C. | attenuator |
| D. | equalizer |
| Answer» E. | |
| 126. |
Which of the following is not included in the optical fiber link measurement test? |
| A. | attenuation measurement |
| B. | dispersion measurement |
| C. | splice loss measurement |
| D. | receiver sensitivity |
| Answer» E. | |
| 127. |
The major advantage of the trans- impedance configuration over the high- impedance front end is |
| A. | greater bandwidth |
| B. | less bandwidth |
| C. | greater dynamic range |
| D. | less dynamic range |
| Answer» D. less dynamic range | |
| 128. |
A high-impedance amplifier has an effective input resistance of 4MΩ. Find the maximum bandwidth that may be obtained without equalization if the total capacitance is 6 pF and total effective load resistance is 2MΩ. |
| A. | 13.3 khz |
| B. | 14.2 khz |
| C. | 15.8 khz |
| D. | 13.9 khz |
| Answer» B. 14.2 khz | |
| 129. |
The high-impedance front-end amplifier provides a far greater bandwidth than the trans-impedance front-end. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 130. |
The trans-impedance front end configuration operates as a                      with negative feedback. |
| A. | current mode amplifier |
| B. | voltage amplifier |
| C. | attenuator |
| D. | resonator |
| Answer» B. voltage amplifier | |
| 131. |
How many receiver structures are used to obtain better receiver characteristics? |
| A. | two |
| B. | one |
| C. | four |
| D. | three |
| Answer» E. | |
| 132. |
How many amplifier configurations are frequently used in optional fiber communication receivers? |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» D. four | |
| 133. |
Noise contributions from the sources should be minimized to maximize the receiver sensitivity. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 134. |
The phase frequency response of the system should be                          in order to minimize inter-symbol interference. |
| A. | non-linear |
| B. | linear |
| C. | more |
| D. | less |
| Answer» C. more | |
| 135. |
                     compensates for distortion of the signal due to the combined transmitter, medium and receiver characteristics. |
| A. | amplification |
| B. | distortion |
| C. | equalization |
| D. | dispersion |
| Answer» D. dispersion | |
| 136. |
How many circuits are present in an equivalent circuit for the digital optical fiber receiver? |
| A. | four |
| B. | one |
| C. | three |
| D. | two |
| Answer» B. one | |
| 137. |
Determine the output current of RAPD having multiplication factor of 39 and photocurrent of 0.469μA. |
| A. | 17.21 |
| B. | 10.32 |
| C. | 12.21 |
| D. | 18.29 |
| Answer» E. | |
| 138. |
Compute multiplication factor of RAPD with output current of 10 μAand photocurrent of 0.369μA. |
| A. | 25.32 |
| B. | 27.100 |
| C. | 43 d) 22.2 |
| Answer» C. 43 d) 22.2 | |
| 139. |
Compute the photocurrent of RAPD having multiplication factor of 36.7 and output current of 7μA. |
| A. | 0.01 μa |
| B. | 0.07 μa |
| C. | 0.54 μa |
| D. | 0.9 μa |
| Answer» B. 0.07 μa | |
| 140. |
Compute wavelength of RAPD with 70% efficiency and Responsivity of 0.689 A/w. |
| A. | 6μm |
| B. | 7.21μm c) 0.112μm |
| C. | d) 3μm |
| Answer» D. | |
| 141. |
Determine the Responsivity of optical power of 0.4μW and photocurrent of 0.294 μA. |
| A. | 0.735 |
| B. | 0.54 |
| C. | 0.56 |
| D. | 0.21 |
| Answer» B. 0.54 | |
| 142. |
Determine Responsivity of a silicon RAPD with 80% efficiency, 0.7μm wavelength. |
| A. | 0.459 |
| B. | 0.7 |
| C. | 0.312 |
| D. | 0.42 |
| Answer» B. 0.7 | |
| 143. |
Fall times of 1 ns or more are common. |
| A. | false |
| B. | true |
| Answer» C. | |
| 144. |
Often                      pulse shape is obtained from APD. |
| A. | negligible |
| B. | distorted |
| C. | asymmetric |
| D. | symmetric |
| Answer» D. symmetric | |
| 145. |
The phenomenon leading to avalanche breakdown in reverse-biased diodes is known as |
| A. | is negligible |
| B. | very less |
| C. | increases gradually |
| D. | dominates |
| Answer» E. | |
| 146. |
At low gain, the transit time and RC effects |
| A. | are negligible |
| B. | are very less |
| C. | dominate |
| D. | reduce gradually |
| Answer» D. reduce gradually | |
| 147. |
               is fully depleted by employing electric fields. |
| A. | avalanche photodiode |
| B. | p-i-n diode |
| C. | varactor diode |
| D. | p-n diode |
| Answer» B. p-i-n diode | |
| 148. |
The digital transmission on implementation of polarization modulation which involves polarization characteristics of the transmitted optical signal is known as |
| A. | frequency shift keying |
| B. | amplitude shift keying |
| C. | phase shift keying |
| D. | polarization shift keying |
| Answer» E. | |
| 149. |
                   can potentially provide spectral conservation through the use of multilevel signalling. |
| A. | m-ary psk |
| B. | mfsk |
| C. | ask |
| D. | dfsk |
| Answer» B. mfsk | |
| 150. |
Eight level FSK and binary PSK yields an equivalent sensitivity. |
| A. | false |
| B. | true |
| Answer» C. | |