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BEL Trainee Engineer Electronics Mock Test - 6 - Electronics and Communication Engineering (ECE) MCQ


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30 Questions MCQ Test BEL Trainee Engineer Electronics Mock Test Series 2024 - BEL Trainee Engineer Electronics Mock Test - 6

BEL Trainee Engineer Electronics Mock Test - 6 for Electronics and Communication Engineering (ECE) 2024 is part of BEL Trainee Engineer Electronics Mock Test Series 2024 preparation. The BEL Trainee Engineer Electronics Mock Test - 6 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The BEL Trainee Engineer Electronics Mock Test - 6 MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for BEL Trainee Engineer Electronics Mock Test - 6 below.
Solutions of BEL Trainee Engineer Electronics Mock Test - 6 questions in English are available as part of our BEL Trainee Engineer Electronics Mock Test Series 2024 for Electronics and Communication Engineering (ECE) & BEL Trainee Engineer Electronics Mock Test - 6 solutions in Hindi for BEL Trainee Engineer Electronics Mock Test Series 2024 course. Download more important topics, notes, lectures and mock test series for Electronics and Communication Engineering (ECE) Exam by signing up for free. Attempt BEL Trainee Engineer Electronics Mock Test - 6 | 100 questions in 120 minutes | Mock test for Electronics and Communication Engineering (ECE) preparation | Free important questions MCQ to study BEL Trainee Engineer Electronics Mock Test Series 2024 for Electronics and Communication Engineering (ECE) Exam | Download free PDF with solutions
BEL Trainee Engineer Electronics Mock Test - 6 - Question 1

Which of the following statements does NOT satisfy the advantage of a photodiode?

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 1

Photodiode:

  • A photodiode can convert light into either current or voltage depending upon the mode of operation.
  • It is designed to operate in reverse bias.

Advantages of Photodiode:

  • The photodiode is linear
  • Low resistance
  • A very good spectral response
  • Better frequency response
  • Low dark current
  • Fastest photodetector
  • It can be used as a variable resistance device
  • Long lifetime, Low noise, High quantum efficiency, It is highly sensitive to the light
  • Compact and lightweight
  • No high voltage requires
  • Using photodiode the speed of operation is very high

Disadvantages of Photodiode:

  • Require increases in the dark current
  • It depends on the temperature
  • Small active area
  • Normal PN junction photodiode has a very high response time
  • It has very low sensitivity
  • Light sensitive device
  • Poor temperature stability
BEL Trainee Engineer Electronics Mock Test - 6 - Question 2

Which of the following is true regarding the sampled data control systems?

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 2

Sampled data system:

When the signal or information at any or some points in a system is in the form of discrete pulses, then the system is called discrete data system or sampled data system.

The following methods suitable for the stability analysis of sampled data control systems.

  • Jury’s stability test
  • Root locus technique
  • Bilinear transformation

Merits:

  • Systems are highly accurate, fast and flexible
  • Use of time sharing concept of digital computer results in economical cost and space.
  • Digital transducers used in the system have better resolution.
  • The digital components are less affected by noise, non-linearities and transmission errors of noisy channel.

Demerits:

  • Conversion of analog signals to discrete-time signals and reconstruction introduce noise and errors in the signal.
  • Additional filters have to be introduced in the system if the components of the system does not have adequate filtering characteristics.
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BEL Trainee Engineer Electronics Mock Test - 6 - Question 3

If an AC bridge is balanced, then the current through the detector is equal to:

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 3

The correct answer is (option 4) i.e. 0 A

Concept:

  • We have taken the example of A.C. the bridge here.
  • Here we can clearly see that there are a total of 4 arms and one detector connected.
  • For a balanced bridge, the detector shows zero deflections.

The condition for the balanced bridge is

So if the ac bridge is balanced, then the current through the detector is 0 A.

Additional Information


BEL Trainee Engineer Electronics Mock Test - 6 - Question 4

Find the time constant for the given network.

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 4

Concept:

The time constant for an RC circuit is given by:

τ = Req C

While calculating the time constant, independent must be replaced by their internal impedances.

Calculation:

Req = 1+ 2 Ω

Req = 3 Ω

τ = 3 × 1

τ = 3 sec

Additional Information 
The time constant for an RL circuit is given by:

BEL Trainee Engineer Electronics Mock Test - 6 - Question 5
Which is the correct value of input resistance of a voltmeter that give accurate reading? 
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 5

A practical voltmeter must have a very high input resistance value (Ideally Infinite).

A voltmeter measures the voltage difference between the two different points but it should not change the amount of current going through the element between these two points.

So it should have high resistance so that it doesn't draw current through it.

Values of input resistance

BEL Trainee Engineer Electronics Mock Test - 6 - Question 6
The most preferred cleavage plane for silicon is:
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 6

Cleavage plane:

  • When a crystal is break or fracture easily along a definite plane then this plane is called cleavage plane.
  • It is used to identity mineral and its quality.
  • It forms generally in a lower energy crystal structure.
  • In silicon, most preferred cleavage plane is < 111 >
Silicon have two cleavage plane < 111 > and < 110 >
BEL Trainee Engineer Electronics Mock Test - 6 - Question 7
The number of complex additions and multiplications in direct DFT are, respectively
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 7

Discrete fourier transform (DFT) is basically a fourier transform of “Sampled signal repeated periedically”.

The no. of points in DFT is known as N-point DFT. Which is crual to period of time domain signal.

If x[n] is sampled time domain signal, then its corresponding DFT X[k] can be expressed as:

Where N is period of x[n]

For a particular value of “k” there is (N – 1) complex addition and N complex multiplications takes place.

For one-point DFT = (N – 1) additions takes place

Then for N point DFT = (N)(N – 1) additions takes place

For one-point DFT, N multiplications takes place

Then for N point DFT, N2 multiplication takes place.
BEL Trainee Engineer Electronics Mock Test - 6 - Question 8
Doppler shift in radar is given by:
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 8

Doppler Shift:

If the observer is moving with respect to the source he observes a change in frequency of the wave emitted by the source, this is called Doppler shift or Doppler effect.

fd = doppler frequency in Hz

v = speed of wave source (m/sec)

λ = Wavelength (m)
BEL Trainee Engineer Electronics Mock Test - 6 - Question 9

Optical Time domain Reflectometer is used to measure:

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 9

Concept:

  • An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber.
  • The Optical Time Domain Reflectometer (OTDR) is useful for testing the integrity of fiber optic cables.
  • OTDR is used to verify splice loss, find faults, and measure the length of optical communication.
  • The instrument emits short laser pulses, e.g. with pulse durations of some tens of nanoseconds and peak power of a few hundred milliwatts, as can be obtained with a single-mode laser diode.
  • The pulses are injected through a launch cable into the tested optical fiber.
  • Any reflected light is extracted with a directional fiber coupler and sent to a fast and sensitive photodetector.
  • The photodetector allows for the time-resolved measurement of the reflected optical power and thus of the return loss.
  • One can find the propagation losses and also find whether the loss coefficient is constant along with the fire or changes locally. 

BEL Trainee Engineer Electronics Mock Test - 6 - Question 10
Which of the following registers holds the address of an instruction?
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 10

The correct answer is option 2.

Concept:

  Registers are a type of computer memory used to quickly accept, store, and transfer data and instructions that are being used immediately by the CPU. The registers used by the CPU are often termed Processor registers.

A list of some of the most frequent registers found in a basic computer follows:

Hence the correct answer is PC.

BEL Trainee Engineer Electronics Mock Test - 6 - Question 11

​In absence of ______ the pointer will swing beyond its final steady-state position and the deflection will be indefinite

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 11

Torque in measuring instruments

Following are the types of torque produced in measuring instruments.

1.) Deflecting torque

  • This torque causes the pointer to move from its initial (zero) position.
  • To obtain this force in an instrument, different effects of electric current are used such as magnetic effect, heating effect, chemical effect, etc.

2.) Controlling torque

  • The controlling force always acts in opposite direction to the deflecting force.
  • In absence of controlling torque, the pointer will swing beyond its final steady-state position and the deflection will be indefinite.
  • After the removal of the moving mechanism, the pointer has to come back to its initial position, but in absence of controlling torque, the pointer won't come back to its initial position.
  • The controlling force could be produced by spring or gravity control.

3.) Damping torque

  • This torque is necessary to bring the pointer to rest in its final deflected position quickly.
  • Without such damping, the combination of deflecting torque and controlling torque makes the pointer oscillate about its final deflected position for some time.
  • The methods to produce damping torque in different instruments are:

BEL Trainee Engineer Electronics Mock Test - 6 - Question 12
Calculate the maximum clock frequency at which a 4-bit asynchronous counter can work reliably. Assume the propagation delay of each flip-flop to be 40 ns and the width of the strobe pulse to be 20 ns.
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 12

Concept:

Lockout free condition: If a counter from an unused state enters one of the used states then the counter is called lock-out free. While taking any unused state as the initial state if the next state comes out to be a used state, the counter is said to be lockout free.

Synchronous counter: A counter in which all the flip-flops are triggered with the same clock pulse. In such counters, if the propagation delay of one flip-flop is tf, then the propagation delay for the whole counter will also be tf

Asynchronous counter: A counter in which all the flip flops are not triggered by the same clock pulse. In such counters, total propagation delay will be equal to the sum of propagation delay for all flip flops.

Calculation:

Given that, propagation delay of each flip-flop = 40 ns

Width of the strobe pulse = 20 ns

Total propagation delay = 40 × 4 + 20 = 180 ns

Maximum clock frequency 

BEL Trainee Engineer Electronics Mock Test - 6 - Question 13

Directions: In the following question, a sentence is given with a blank. You have to fill the blank with one of the words given as options in order to make the sentence contextually and grammatically correct.

The main Chinese motivation stems _______________ its desire to confine the debate within ASEAN-China framework.

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 13

The correct phrasal verb with verb ‘stem’ is ‘stem from’.

Stem from: to be caused by (something or someone).

Ex: Most of her health problems stem from an accident she had when she was five.

Hence, option A is correct.

BEL Trainee Engineer Electronics Mock Test - 6 - Question 14

Direction: In the following question, a sentence has been given in Active/Passive Voice. Out of the four alternative suggested, select the one which best expresses the same sentence in Passive/Active Voice.

He stole that watch

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 14

Note :- Rule to make active voice of Simple Past Tense
We can say that ,
The above given sentence is given in Passive Voice :-
Use structure “subject + auxiliary + past participle + by + object”
That watch was stolen by him.
Hence , required sentence is option A .

BEL Trainee Engineer Electronics Mock Test - 6 - Question 15

Direction: In the following questions choose the word opposite in meaning to the given word.

Grotesque

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 15

The word Grotesque (Adjective) means: strange in a way that is unpleasant: extremely ugly, unusual
Hence, the words grotesque and natural are antonyms. 

BEL Trainee Engineer Electronics Mock Test - 6 - Question 16

INSTRUCTIONS. In each question below, there is a sentence in which some parts have been jumbled up. Rearrange these parts which are labeled P, Q, R, and S to produce the correct sentence. Choose the proper sequence.

Question. When he
P: did not know
Q: he was nervous and
R: heard the hue and cry at midnight
S: what to do

The Proper sequence should be:

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 16

After looking at the given parts  P, Q, R, and S, it can be concluded that the correct order will be:  

When he → heard the hue and cry at midnight → he was nervous and → did not know → what to do. 

So, correct order is RQPS.

BEL Trainee Engineer Electronics Mock Test - 6 - Question 17

Direction: In the following questions choose the word opposite in meaning to the given word.

Meandering

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 17

The word Meandering (Adjective) means : not straight; curved; a course that does not follow a straight path.
Hence, the words meandering and straight are antonymous. 

BEL Trainee Engineer Electronics Mock Test - 6 - Question 18

Direction: Read the following passages carefully and answer the question that follows.
Knowledge means knowing the things in an appropriate and better way. A man of knowledge can understand the circumstances more wisely, so can decide the things favorably. Knowledge inspired. confidence and courage to act at a right time. A man of knowledge possesses immense influence in society. He has the capacity to lead the society, mold the society in a positive direction and keeps away the society from the many social evils. A man of knowledge can turn the sleeping people into a thundering force. Whatever the inventions and discoveries are seen today. from needle to the jet planes. are the result of proper use of knowledge. Human being is the only creature who can use his brain wisely, rationally, selectively and can do wonders.

Q. What sort of life a man of knowledge can lead?

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 18

The author makes this clear in the fourth sentence of the passage that a man of knowledge possesses immense influence in society

BEL Trainee Engineer Electronics Mock Test - 6 - Question 19

By an extranet, we mean

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 19
Definition of an Extranet:
An extranet is a private computer network that allows authorized users from different organizations to access shared information, collaborate, and communicate securely over the internet.
Explanation:
The correct answer is B: The intranets of two co-operating organizations interconnected via a secure leased line.
- An extranet is an extension of an organization's intranet, which is a private network accessible only to employees or members of the organization.
- It is used to provide controlled access to external parties such as suppliers, partners, or customers.
- The extranet allows these external parties to connect to the organization's intranet and access specific resources or information based on their authorization level.
- The connection between the two intranets is established via a secure leased line, ensuring the confidentiality and integrity of the data transmitted.
- The extranet provides a secure and collaborative environment for organizations to share data, documents, and applications with their trusted partners, suppliers, or customers.
- It enables efficient communication, streamlined business processes, and improved collaboration between organizations.
Key Points:
- An extranet is a private computer network.
- It allows authorized users from different organizations to access shared information.
- It enables collaboration and communication securely over the internet.
- It is an extension of an organization's intranet.
- It connects the intranets of two cooperating organizations.
- The connection is established via a secure leased line.
BEL Trainee Engineer Electronics Mock Test - 6 - Question 20
In Powerpoint, two kinds of sound effect files can be added to the presentation are -
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 20

The correct option is (2) ".wav and mid files"

Key Points

  • The following sound effects are available for Microsoft PowerPoint: A PowerPoint presentation uses wave files and MIDI files (. wav files and. mid files).
  • All popular sound file formats, including MP3, WAV, FLAC, MIDI, and WMA, are supported by PowerPoint.
  • The IBM and Microsoft-developed Waveform Audio File Format (WAVE, or WAV due to its filename extension; pronounced "wave") is a standard audio file format for storing an audio bitstream on PCs.
  • The Musical Instrument Digital Interface (MIDI) standard was created for digital music synthesizers and is used to transmit and store music. Recorded sounds cannot be transmitted using MIDI.

Additional Information GIF Files:- Graphics Interchange Format is referred to as GIF. GIF is a raster file format made for simple graphics that are primarily found online.

JPEG Files:- Joint Photographic Experts Group is referred to as JPEG. One of the most popular image file formats in use today is the JPEG format.

BEL Trainee Engineer Electronics Mock Test - 6 - Question 21
What is the function of ‘Ctrl + I’?
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 21

The correct answer is Italic.

Key Points

  • Ctrl + I is used to apply the italic format to the selected text. Hence, Option 3 is correct.

Additional Information

  • List of Computer Shortcut Keys
BEL Trainee Engineer Electronics Mock Test - 6 - Question 22

How to remove the unwanted action from recorded macro without recording the whole macro again?

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 22

To remove unwanted actions from a recorded macro without recording the whole macro again, you can follow these steps:
Step 1: Open the Visual Basic Editor
- Press Alt + F11 to open the Visual Basic Editor.
Step 2: Locate and Select the Macro
- In the Visual Basic Editor, locate the macro that contains the unwanted action.
- Select the macro by clicking on its name in the Project Explorer window.
Step 3: Edit the Macro Code
- Once the macro is selected, the code corresponding to the macro will be displayed in the Code window.
- Scroll through the code to find the unwanted action that you want to remove.
Step 4: Remove the Unwanted Action
- Place your cursor on the line of code that represents the unwanted action.
- Press the Delete key to remove the line of code.
- Repeat this process for any other unwanted actions that you want to remove.
Step 5: Save and Close the Visual Basic Editor
- After removing the unwanted actions, save the changes by clicking on the Save button or pressing Ctrl + S.
- Close the Visual Basic Editor by clicking on the Close button or pressing Alt + Q.
The unwanted actions have now been removed from the recorded macro without having to re-record the entire macro.
BEL Trainee Engineer Electronics Mock Test - 6 - Question 23
When using a Chrome Internet browser, a method of saving web page addresses for quick access is:
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 23

The correct answer is Bookmark.

  • A Chrome Internet browser, a method of saving web page addresses for quick access is Bookmark.

Key Points

  • Bookmark
    • “Bookmark” refers to links to sites that we store for easy access later.
    • A bookmark is a saved shortcut that directs your browser to a specific webpage.
    • It stores the title, URL, and favicon of the corresponding page.
    • Saving bookmarks allows you to easily access your favourite locations on the Web.

Additional Information

  • Proxy Setting
    • A proxy server acts as a gateway between you and the internet.
    • It’s an intermediary server separating end users from the websites they browse.
  • Clear Cache
    • When we use a browser it saves some information from websites in its cache and cookies.
    • Clearing them fixes certain problems, like loading or formatting issues on sites.
  • Delete history
    • Windows short cut to delete history:
      • CTRL+SHIFT+DEL
BEL Trainee Engineer Electronics Mock Test - 6 - Question 24

Direction: If a Paper (Transparent Sheet) is folded in a manner and a design or pattern is drawn. When unfolded this paper appears as given below in the answer figure. Choose the correct answer figure given below.

A square sheet of paper has been folded and punched as shown below. How will it appear when opened?
Question Figure

Answer figure

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 24

BEL Trainee Engineer Electronics Mock Test - 6 - Question 25

Complete the following series.

V, R, O, M, ?

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 25

The pattern followed here is:

Hence, the correct answer is "L".

BEL Trainee Engineer Electronics Mock Test - 6 - Question 26

Directions to Solve

In each of the following questions find out the alternative which will replace the question mark.

Question -

Peacock : India :: Bear : ?

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 26

As Peacock is the national bird of India, similarly Bear is the national animal of Russia.

BEL Trainee Engineer Electronics Mock Test - 6 - Question 27
A wire is bent to form a square of side 22 cm. If the wire is rebent to form a circle, then its radius will be: 
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 27

Given:

The side of the square = 22 cm

Formula used:

The perimeter of the square = 4 × a    (Where a = Side of the square)

The circumference of the circle = 2 × π × r     (Where r = The radius of the circle)

Calculation:

Let us assume the radius of the circle be r

⇒ The perimeter of the square = 4 × 22 = 88 cm

⇒ The circumference of the circle = 2 × π ×  r

⇒ 88 = 2 × (22/7) × r

⇒ 

⇒ r = 14 cm

∴ The required result will be 14 cm.

BEL Trainee Engineer Electronics Mock Test - 6 - Question 28

Direction: If a Paper (Transparent Sheet) is folded in a manner and a design or pattern is drawn. When unfolded this paper appears as given below in the answer figure. Choose the correct answer figure given below.

A piece of paper is folded and cut as shown below in the question figure. From the given answer figure, indicate how it will appear when opened.
Question Figure

Answer figure

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 28

BEL Trainee Engineer Electronics Mock Test - 6 - Question 29

Directions: Each of the following consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question:

In which direction is Library with respect to the college?
I.  Point A is 3km North of Library. Point C is 3km North of point B. Point D is 3km East of point C.
II.  College is 7km North of point F. Point D is 6km North of point E. Library is 7km west of point E. Point F is 4km East of point E.

Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 29

Checking → statement I:

References:

Point A is 3km north of library.

Point C is 3km North of Point B.

Point D is 3km East of point C.

Inferences:

From the above references, we can conclude that instruction about college is missing in statement I.

So, we can’t determine the direction between library and college.

Thus, statement I alone is not sufficient to answer the question

Checking → Statement II:

References:

College is 7km North of point F.

Point D is 6km North of point E.

Library is 7km west of point E.

Point F is 4km East of point E.

Inferences:

From the above references, we can conclude the following.


We can conclude that library is to the South West direction with respect to college.

Thus, statement II alone is sufficient to answer the question.

Hence, option B is correct.

BEL Trainee Engineer Electronics Mock Test - 6 - Question 30
If x + y + 1 = 0, then x3 + y3 - 3xy = ?
Detailed Solution for BEL Trainee Engineer Electronics Mock Test - 6 - Question 30

Given:

x + y + 1 = 0

Concept Used:

(a + b )3 = a3 + b3 + 3ab (a + b)

Calculations:

x + y + 1 = 0

⇒ x + y = -1

Cubing on both sides we get

(x + y)3 = ( -1 )3

⇒ x3 + y3 + 3xy( x + y ) = -1

⇒ x3 + y3 + 3xy ( -1) = -1

∵ x + y = -1

⇒ x3 + y3 - 3xy = -1

∴ required value = -1

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