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.
| 1. |
An incandescent lamp is operating at a temperature of 1000K at an operating frequency of 5.2×1014 Hz. Calculate the ratio of stimulated emission rate to spontaneous emission rate. |
| A. | 3×10-13 |
| B. | 1.47×10-11 |
| C. | 2×10-12 |
| D. | 1.5×10-13 |
| Answer» C. 2×10-12 | |
| 2. |
A GaAs injection laser has a threshold current density of 2.5*103Acm-2 and length and width of the cavity is 240μm and 110μm respectively. Find the threshold current for the device. |
| A. | 663 ma |
| B. | 660 ma |
| C. | 664 ma |
| D. | 712 ma |
| Answer» C. 664 ma | |
| 3. |
The ring and star topologies are combined in a configuration. |
| A. | mesh |
| B. | fringe |
| C. | data |
| D. | singular |
| Answer» B. fringe | |
| 4. |
As compared to planar LED structure, Dome LEDs have External power efficiency effective emission area and radiance. |
| A. | greater, lesser, reduced |
| B. | higher, greater, reduced |
| C. | higher, lesser, increased |
| D. | greater, greater, increased |
| Answer» C. higher, lesser, increased | |
| 5. |
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 | |
| 6. |
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 | |
| 7. |
Almost of the transmitter power is wasted in the use of external modulators. |
| A. | half |
| B. | quarter |
| C. | one-third |
| D. | twice |
| Answer» B. quarter | |
| 8. |
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 | |
| 9. |
A single mode fiber has mode field diameter 10.2μm and V=2.20. What is the core diameter of this fiber? |
| A. | 11.1μm |
| B. | 13.2μm |
| C. | 7.6μm |
| D. | 10.1μm |
| Answer» E. | |
| 10. |
in the laser occurs when photon colliding with an excited atom causes the stimulated emission of a second photon. |
| A. | light amplification |
| B. | attenuation |
| C. | dispersion |
| D. | population inversion |
| Answer» B. attenuation | |
| 11. |
The time domain dispersion measurement setup involves as the photo detector. |
| A. | avalanche photodiode |
| B. | oscilloscope |
| C. | circulator |
| D. | gyrator |
| Answer» B. oscilloscope | |
| 12. |
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 | |
| 13. |
waveguides are plagued by high losses. |
| A. | circular |
| B. | planar |
| C. | depleted |
| D. | metal-clad |
| Answer» E. | |
| 14. |
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 | |
| 15. |
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. | |
| 16. |
mode is temporary, selective and continuous. |
| A. | cell switching |
| B. | buffer switching |
| C. | cache |
| D. | circuit switching |
| Answer» E. | |
| 17. |
15, n2 = 1.11 and an operating wavelength of 0.7μm. Find the radius of curvature? |
| A. | 8.60μm |
| B. | 9.30μm |
| C. | 9.1μm |
| D. | 10.2μm |
| Answer» C. 9.1μm | |
| 18. |
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 | |
| 19. |
The maximum bit rate that may be obtained on an optical fiber link is 1/3Γ. |
| A. | true |
| B. | false |
| Answer» C. | |
| 20. |
The system is best developed and is used for fabricating both lasers and LEDs for the shorter wavelength region. |
| A. | inp |
| B. | gasb |
| C. | gaas/gasb |
| D. | gaas/alga as dh |
| Answer» E. | |
| 21. |
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 | |
| 22. |
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 | |
| 23. |
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 | |
| 24. |
An optical fiber has a core radius 2μm and a numerical aperture of 0.1. Will this fiber operate at single mode at 600 nm? |
| A. | yes |
| B. | no |
| Answer» B. no | |
| 25. |
When the dimensions of the guide are reduced, the number of also decreases. |
| A. | propagating nodes |
| B. | electrons |
| C. | holes |
| D. | volume of photons |
| Answer» B. electrons | |
| 26. |
The planar waveguides may be fabricated from glasses and other isotropic materials such as and |
| A. | octane and polymers |
| B. | carbon monoxide and diode |
| C. | fluorides and carbonates |
| D. | sulphur dioxide and polymers |
| Answer» E. | |
| 27. |
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 | |
| 28. |
The incorporates a line receiver in order to convert the optical signal into the electrical regime. |
| A. | attenuator |
| B. | transmitter |
| C. | repeater |
| D. | designator |
| Answer» D. designator | |
| 29. |
is a multi-functional element of optical network. |
| A. | hop |
| B. | optical node |
| C. | wavelength |
| D. | optical attenuation |
| Answer» C. wavelength | |
| 30. |
is also known as frequency- shaping filter. |
| A. | resonator |
| B. | amplifiers |
| C. | attenuator |
| D. | equalizer |
| Answer» E. | |
| 31. |
Devices such as are used to simulate the steady-state mode distribution. |
| A. | gyrators |
| B. | circulators |
| C. | mode scramblers |
| D. | attenuators |
| Answer» D. attenuators | |
| 32. |
In the topology, the data generally circulates bi-directionally. |
| A. | mesh |
| B. | bus |
| C. | star |
| D. | ring |
| Answer» C. star | |
| 33. |
In the given equation, state what αr suggests? |
| A. | radius of curvature |
| B. | refractive index difference |
| C. | radiation attenuation coefficients |
| D. | constant of proportionality |
| Answer» D. constant of proportionality | |
| 34. |
43 μm. Determine the number of longitudinal modes. |
| A. | 1×102 |
| B. | 3×106 |
| C. | 2.9×105 |
| D. | 2.2×105 |
| Answer» E. | |
| 35. |
The fundamentals of optical networking are divided into areas. |
| A. | two |
| B. | one |
| C. | four |
| D. | three |
| Answer» E. | |
| 36. |
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 | |
| 37. |
A single mode fiber has refractive indices n1=1.50, n2 = 2.23, core diameter of 8μm, wavelength = 1.5μm cutoff wavelength = 1.214μm. Find the radius of curvature? |
| A. | 12 mm |
| B. | 20 mm |
| C. | 34 mm |
| D. | 36 mm |
| Answer» D. 36 mm | |
| 38. |
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 | |
| 39. |
A is a series of logical connections between the source and destination nodes. |
| A. | cell circuit |
| B. | attenuation circuit |
| C. | virtual circuit |
| D. | switched network |
| Answer» D. switched network | |
| 40. |
Considering the values given below, calculate the mode separation in terms of free space wavelength for a laser. (Frequency separation = 2GHz, Wavelength = 0.5 μm) |
| A. | 1.4×10-11 |
| B. | 1.6×10-12 |
| C. | 1×10-12 |
| D. | 6×10-11 |
| Answer» C. 1×10-12 | |
| 41. |
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 | |
| 42. |
is essentially a crude form of Amplitude shift keying. |
| A. | analog modulation |
| B. | digital intensity modulation |
| C. | photodetector |
| D. | receiver structure |
| Answer» C. photodetector | |
| 43. |
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 | |
| 44. |
Often pulse shape is obtained from APD. |
| A. | negligible |
| B. | distorted |
| C. | asymmetric |
| D. | symmetric |
| Answer» D. symmetric | |
| 45. |
A 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 | |
| 46. |
is caused by surface tension effects between the two fiber ends during fusing. |
| A. | pre-fusion |
| B. | diffusion |
| C. | self-alignment |
| D. | splicing |
| Answer» D. splicing | |
| 47. |
offers the potential for improving the coherent optical receiver sensitivity by increasing the choice of signalling frequencies. |
| A. | mfsk |
| B. | mdsk |
| C. | mpsk |
| D. | mask |
| Answer» B. mdsk | |
| 48. |
measurements give an indication of the distortion to the optical signals as they propagate down optical fibers. |
| A. | attenuation |
| B. | dispersion |
| C. | encapsulation |
| D. | frequency |
| Answer» C. encapsulation | |
| 49. |
is used when the optical emission results from the application of electric field. |
| A. | radiation |
| B. | efficiency |
| C. | electro-luminescence |
| D. | magnetron oscillator |
| Answer» D. magnetron oscillator | |
| 50. |
In the optical channel bandwidth is divided into non-overlapping frequency bands. |
| A. | time division multiplexing |
| B. | frequency division multiplexing |
| C. | code division multiplexing |
| D. | de-multiplexing |
| Answer» C. code division multiplexing | |