All India Trade Test – 2024 Mechanic Consumer Electronic Appliances – Second Year Question Paper – Set 2

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All India Trade Test – 2024

Mechanic Consumer Electronic Appliances – Second Year

Question Paper – Set 2

Total Marks: 150 | Total Questions: 75 | Marks per Question: 2

Part 1: Trade Theory (Questions 1–38)

Question 1. What is the maximum temperature range reached in the reflow zone of the reflow soldering process?

1. 10°C to 15°C
2. 20°C to 40°C
3. 41°C to 60°C
4. 61°C to 80°C

Question 2. Which is the common method used to attach surface-mount components to a printed circuit board (PCB)?

1. Wave soldering
2. Manual soldering
3. Soldering station
4. Reflow soldering

Question 3. Which protective chemical coating is applied to a PCB?

1. Shellac
2. PVC coating
3. Enamel varnish
4. Polymer film coating

Question 4. Identify the type of relay shown in the figure.

1. Thermal relay
2. Dry reed relay
3. Impulse relay
4. Latching relay

Figure: See page 2 of the original PDF.

Question 5. What is the fusing factor of a rewirable fuse selected for overcurrent protection in a circuit?

1. 1.1
2. 1.2
3. 1.3
4. 1.4

Question 6. What is the maximum current rating of a four-pole MCB?

1. 50 A
2. 60 A
3. 70 A
4. 80 A

Question 7. What is the name of the device shown in the figure?

1. Starter
2. Relay
3. Contactor
4. Switch

Figure: See page 3 of the original PDF.

Question 8. Which device opens and closes an auxiliary circuit?

1. Fuse
2. Relay
3. Starter
4. Circuit breaker

Question 9. Which relay operates when the current in a coil reaches its upper limit?

1. Latching relay
2. Undercurrent relay
3. Current-sensing relay
4. Voltage-sensing relay

Question 10. What is the maximum earth-fault loop impedance for an ELCB with a rated tripping current of 30 mA?

1. 900 Ω
2. 1200 Ω
3. 1666 Ω
4. 2666 Ω

Question 11. What is the tripping time for clearing a short circuit in an MCB combination circuit breaker?

1. 1 millisecond
2. 3 milliseconds
3. 4 milliseconds
4. 5 milliseconds

Question 12. Under which condition does an MCB open an electrical circuit?

1. Low current
2. High voltage
3. Short circuit
4. Earth leakage

Question 13. What is the speed of light?

1. 3 × 10³ metres per second
2. 3 × 10⁶ metres per second
3. 3 × 10⁸ metres per second
4. 3 × 10¹⁰ metres per second

Question 14. What is the name of the block marked 'X' in the block diagram of a digital communication system?

1. Amplifier
2. Modulator
3. Rectifier
4. Multiplexer

Block diagram: See page 4 of the original PDF.

Question 15. What is the frequency range of the Short Wave (SW) band?

1. 550 kHz to 1650 kHz
2. 3 MHz to 30 MHz
3. 30 MHz to 100 MHz
4. 200 MHz to 300 MHz

Question 16. What is the name of the block diagram shown in the figure?

1. TRF receiver
2. FM receiver
3. Satellite receiver
4. Superheterodyne receiver

Block diagram: See page 5 of the original PDF.

Question 17. Which type of modulation is used to superimpose a signal on a carrier wave?

1. Amplitude modulation
2. Frequency modulation
3. Phase modulation
4. Voice modulation

Question 18. Which instrument is required to align an FM detector in a receiver circuit?

1. Ammeter
2. Voltmeter
3. Distortion analyser
4. Ohmmeter

Question 19. Which amplifier matches the output impedance of a carrier oscillator to the input impedance of the next stage?

1. Buffer amplifier
2. Power amplifier
3. Audio amplifier
4. Video amplifier

Question 20. What is the full form of AFC?

1. Automatic Function Control
2. Automatic Frequency Control
3. Automatic Filter Control
4. Automatic Format Control

Question 21. Which FM detector technique produces the frequency-response characteristic shown in the figure?

1. Ratio detector
2. Foster-Seeley FM detector
3. FM slope detector
4. Quadrature FM detector

Graph: See page 6 of the original PDF.

Question 22. What is the modulation index of the AM wave shown in the figure?

1. 0.5
2. 5
3. 10
4. 50

Waveform: See page 7 of the original PDF.

Question 23. What is the name of the radio receiver shown in the figure?

1. FM receiver
2. TRF receiver
3. Reflex receiver
4. Superheterodyne receiver

Block diagram: See page 7 of the original PDF.

Question 24. What is the function of the analogue multiplier IC AD633?

1. To generate an FM signal
2. To generate an AM signal
3. To demodulate an AM signal
4. To demodulate an FM signal

Question 25. Which type of antenna is used for point-to-point communication using radio waves?

1. Parabolic antenna
2. Omnidirectional antenna
3. Dipole antenna
4. Yagi antenna

Question 26. Which type of wire is being replaced by optical fibre communication in core networks?

1. Copper wire
2. Aluminium wire
3. Steel wire
4. Iron wire

Question 27. How does the core diameter of multimode fibre compare with that of single-mode fibre?

1. Twice as large
2. Three times as large
3. Five times as large
4. Ten times as large

Question 28. Which type of fibre has greater distortion?

1. Single step-index fibre
2. Graded-index fibre
3. Multimode step-index fibre
4. Glass fibre

Question 29. Which diode is used in an optical encoder to convert an RF signal into an optical signal?

1. Zener diode
2. PN diode
3. Laser diode
4. Tunnel diode

Question 30. What is the power loss in a fibre-optic cable called?

1. Attenuation
2. Modulation
3. Oscillation
4. Amplification

Question 31. What is the full form of PWM in modulation techniques?

1. Pulse Width Modulation for digital mode
2. Pulse Width Modulation for analogue mode
3. Pulse Width Modulation for analogue mode only
4. Pulse Width Modulation for both digital and analogue modes

Question 32. Which technique is used to join optical fibres?

1. Fusion technique
2. Soldering technique
3. Coating technique
4. Brazing technique

Question 33. Approximately how much loss occurs at a continuous connection in a fibre-optic cable?

1. 0.1 dB
2. 0.01 dB
3. 1 dB
4. 0.001 dB

Question 34. What is the full form of OTDR?

1. Optical Time Domain Reflectometer
2. Optical Time Base Reflection Meter
3. Optical Time Decision Reflection Meter
4. Optical Time Factor Reflector Meter

Question 35. On which pin is the master reset (RST) function located in the 8051 microcontroller IC?

1. Pin number 9
2. Pin number 20
3. Pin number 30
4. Pin number 40

Question 36. In a traffic light control system using an 8051 microcontroller, which lens is fitted over a yellow light to produce green light?

1. Red lens
2. Blue lens
3. Green lens
4. Orange lens

Question 37. What is the full form of SFR in a microcontroller?

1. Serial Function Register
2. Safety Function Relay
3. Special Function Register
4. System Function Register

Question 38. How can a longer time delay be implemented in a program using the timer of an 8051 microcontroller?

1. By changing component values
2. By changing the microcontroller
3. By rewriting the program
4. By executing the loop multiple times

Part 2: Workshop Calculation and Science (Questions 39–44)

Question 39. What is the value of (a<sup>m</sup>)<sup>n</sup>?

1. a<sup>m−n</sup>
2. a<sup>m+n</sup>
3. a<sup>m/n</sup>
4. a<sup>mn</sup>

Question 40. What is the expansion of (a + b)<sup>2</sup>?

1. a<sup>2</sup> + 2ab + b<sup>2</sup>
2. a<sup>2</sup> − 2ab + b<sup>2</sup>
3. a<sup>2</sup> + 2ab − b<sup>2</sup>
4. −a<sup>2</sup> − 2ab + b<sup>2</sup>

Question 41. What is the formula for (a − b)<sup>2</sup>?

1. a<sup>2</sup> − 2ab + b<sup>2</sup>
2. a<sup>2</sup> + 2ab + b<sup>2</sup>
3. a<sup>2</sup> − 2ab − b<sup>2</sup>
4. −a<sup>2</sup> − 2ab − b<sup>2</sup>

Question 42. What is the value of a × a<sup>2</sup> × a<sup>3</sup> × a<sup>4</sup>?

1. a<sup>7</sup>
2. a<sup>8</sup>
3. a<sup>9</sup>
4. a<sup>10</sup>

Question 43. What is the value of the exponential expression shown in the figure?

1. a<sup>5</sup>
2. a<sup>−5</sup>
3. 5a
4. −5a

Original expression: See page 12 of the original PDF. The expression is unclear in the scan; the options are reproduced from the question paper.

Question 44. Which standard schedule of rates should be considered when preparing an estimate?

1. Standard schedule of rates from the previous year
2. Standard schedule based on the average rates of the previous 10 years
3. Standard schedule based on the average rates of the previous 5 years
4. Standard schedule of rates for the current year

Part 3: Engineering Drawing (Questions 45–50)

Question 45. Identify the symbol shown in the figure.

1. Electric bell
2. Magnetic head
3. Buzzer
4. Magnetic relay

Symbol: See page 13 of the original PDF.

Question 46. Which of the following figures is not a resistor?

1. Figure A
2. Figure B
3. Figure C
4. Figure D

Refer to pages 13–14 of the original PDF to identify all figures.

Question 47. Which symbol represents a relay?

1. Symbol A
2. Symbol B
3. Symbol C
4. Symbol D

Symbols: See page 14 of the original PDF.

Question 48. What does the following electrical symbol represent?

1. Transformer
2. Relay
3. Resistor
4. Fuse

Symbol: See page 15 of the original PDF.

Question 49. Which of the following is not a type of LED?

1. Figure A
2. Figure B
3. Figure C
4. Figure D

The component figures shown in the options are on pages 15–16 of the original PDF.

Question 50. What does the following electrical symbol represent?

1. Terminal
2. Transformer
3. Cell
4. Fuse

Symbol: See page 16 of the original PDF.

Part 4: Employability Skills (Questions 51–75)

Question 51. What helps us maintain a balance between mental and physical activities?

1. Hobbies
2. Running
3. Walking
4. Reading

Question 52. What important aspects should be checked in a good resume?

1. Quality of the paper
2. Company details
3. It should be free from spelling and grammatical errors and contain accurate information
4. Use of attractive words

Question 53. Role models __________ people to follow them.

1. Elevate
2. Instruct
3. Inspire
4. Encourage

Question 54. What are the conditions of a place that influence the behaviour and development of a person or thing called?

1. Neighbourhood
2. Environment
3. Local area
4. Facilities

Question 55. What are people known as who demonstrate good behaviour, achievements and serve as examples for others?

1. Customer service executives
2. ITI instructors
3. Role models
4. Sales supervisors

Question 56. Fill in the blanks to make a meaningful sentence: “There ______ a coffee shop ______ the park.”

1. are, next to
2. is, next to
3. is, next
4. are, next

Question 57. Fill in the blank: “Rainwater harvesting ______ to prevent water scarcity.”

1. gives
2. gave
3. help
4. helps

Question 58. Fill in the blanks: “There are many dos and don’ts to be ______ while preparing for/attending an ______.”

1. there, interview
2. identify, interview
3. identified, interviewed
4. identified, interview

Question 59. What can result from miscommunication?

1. Building relationships
2. Creating misunderstandings
3. Making successful plans
4. Achieving effective results

Question 60. What is necessary for effective communication?

1. Continuously listening
2. Continuously speaking
3. Listening carefully and speaking
4. Only listening carefully

Question 61. What is stress?

1. A feeling of joy
2. A feeling of surprise
3. A feeling of happiness
4. A feeling of frustration or disappointment

Question 62. What does a person with high emotional intelligence possess?

1. Physical strength
2. Ego
3. Many positive qualities
4. Many negative qualities

Question 63. What is the process of formally introducing oneself called?

1. Self-introduction
2. Hiring
3. Decision
4. Seeking

Question 64. The word “resume” comes from the French language. What does it mean?

1. Summary
2. Education
3. Experience
4. Placement

Question 65. Which of the following information is included in a resume?

1. Hobbies, favourite food and personal interests
2. Childhood memories, dreams and aspirations
3. Daily routine, favourite films and holiday plans
4. Contact information, educational details, skills and work experience

Question 66. How can a covering letter be made easier to read when applying for a job?

1. By writing lengthy descriptions
2. By dividing the text into short paragraphs
3. By increasing the font size
4. By adding extracurricular activities

Question 67. What is the next important step after preparing a resume?

1. Sending the resume to the employer
2. Writing an impressive covering letter
3. Preparing for the interview
4. Applying for the job

Question 68. What is very important to consider when reviewing a resume?

1. Salary details
2. Providing a large amount of information to get a job
3. Interests and hobbies
4. Highlighting skills and qualifications relevant to the job

Question 69. What important information should be mentioned in a covering letter when applying for a job?

1. Salary expectations
2. Educational details
3. Reasons why you are suitable for the position
4. Hobbies

Question 70. What is formal communication?

1. All types of written communication
2. Official communication carried out by following established rules
3. Conversation with friends and family
4. Casual conversation on social media

Question 71. Which of the following is a formal introduction during a job interview?

1. “Hey, nice to meet you!”
2. “Hi, what is your name?”
3. “Hello, you can start the interview!”
4. “Good morning. Thank you for this opportunity.”

Question 72. Which of the following is an example of formal written communication?

1. Sending a text message to a friend
2. Sending a WhatsApp message
3. Writing an email to your manager
4. Posting on a social media platform

Question 73. During a job interview, what should you say if you cannot hear or understand a question?

1. “Sorry, I didn't understand. Could you please repeat the question?”
2. “Hey, can you repeat that? I wasn't paying attention.”
3. “I couldn't understand. Can you say it again?”
4. “Speak clearly and repeat the question.”

Question 74. Which response demonstrates good formal communication during a job interview?

1. “I am good at many things.”
2. “I think I can do a little bit of everything.”
3. “My three key skills are problem-solving, teamwork and attention to detail.”
4. “I don't know; I have never really thought about it.”

Question 75. What is informal communication?

1. All verbal communication
2. Official communication carried out by following established rules
3. Casual conversation outside the formal work structure
4. Conversation during official meetings

Answer Key

The following answers are reproduced according to the answer key on page 23 of the original PDF.

Important Note: Questions 4, 7, 14, 16, 21–23 and 45–50 are based on figures, block diagrams or electrical symbols. Refer to the corresponding pages of the original PDF to view the images and verify the options. The original mathematical expression in Question 43 is unclear in the scan; answer A1 is reproduced according to the original answer key.

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