Explore topic-wise MCQs in Electrical Engineering.

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                            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.