ITI Electronic Mechanic 3rd Semester Exam Papers : The course of ITI Electronic Mechanic is of 2 years and where there is semester system, its complete study is done in 4 semesters or we can say that it is divided in 4 semesters, so below you are given the question paper of its 3rd semester which has been asked earlier in its exam, so solve it carefully and many more question papers related to this trade are given on our website, by solving which you can prepare yourself.
ITI Electronic Mechanic 2nd Semester Exam Papers
ITI Electronic Mechanic 3rd Semester Exam Paper
1. 8052 microcontroller has?
◎ Two timers of 8 kB code memory and 128 bytes data memory
◎ Three timers of 8 kB code memory and 256 bytes data memory
◎ Two timers of 4 kB code memory and 128 bytes data memory
◎ Two timers of 8 kB code memory and 256 bytes data memory
Answer. Three timers of 8 kB code memory and 256 bytes data memory
2. LVDT is a transducer which
◎ converts temperature into proportional output voltage
◎ converts magnetic field into proportional output voltage
◎ converts mechanical displacement into proportional output voltage
◎ converts current into proportional magnetic field
Answer. Converts mechanical displacement into proportional output voltage
3. Modulation is required in a communication receiver for?
◎ For multiplexing
◎ To reduce the height of antenna
◎ To prevent signal mixing
◎ All of the above
Answer. All of the above
4. 8051 microcontroller does not have?
◎ ADC
◎ O port
◎ Timer
◎ Internal oscillator
Answer. ADC
5. USB 1.0 port has?
◎ 4 pin
◎ 6 pin
◎ 8 pin
◎ 12 pin
Answer. 4 pin
6. Maximum size of external memory that can be connected with 8051 microcontroller
is ◎ 64 kB program memory and 64 kB data memory
◎ 32 kB program memory and 32 KB data memory
◎ 4 kB program memory and 1 kB data memory
◎ 64 kB program memory and 4 kB data memory
Answer. 64 kB program memory and 64 kB data memory
7. Standard SATA data connector and standard SATA power connector are?
◎ 7 pin and 15 pin
◎ 8 pin and 16 pin
◎ 12 pin and 16 pin
◎ 8 pin and 4 pin
Answer. 7 pin and 15 pin
8. DIN connector is?
◎ 3 to 8 pin circular connector
◎ 24 pin rectangular connector
◎ 12 pin rectangular connector
◎ 12 pin circular connector
Answer. 3 to 8 pin circular connector
9. When the relative humidity is very low, the charge developed will be?
◎ Very high
◎ Very low
◎ Continuously varying
◎ Will not change
Answer. Very low
10. The size of data memory and code memory in 8051 processor family is?
◎ 1kB and 4 kB
◎ 128 bytes and 4 kB
◎ 256 bytes and 8 kB
◎ 256 bytes and 4 kB
Answer. 128 bytes and 4 kB
11. The component which is not a component of digital storage oscilloscope?
◎ Analog to digital converter
◎ Digital to analog converter
◎ Sampler and memory
◎ Differentiator
Answer. Differentiator
12. If the values of Vmax and Vmin in a single tone amplitude modulated signal in an oscilloscope are 150 mV and 70 mV respectively, then the modulation index is?
◎ 0.8
◎ 0.54
◎ 0.364
◎ 0.245
Answer. 0.364
13. In reflow soldering process of SMT devices
◎ The board is preheated and kept at a constant temperature for some time
◎ The SMT devices are preheated and kept at a constant temperature
◎ Solder paste is applied uniformly on the board and the connecting ends of the SMT devices
◎ Preheating of the board is not necessary
Answer. The board is preheated and kept at a constant temperature for some time
14. What is the advantage of using shielded cable?
◎ Cross-talk is minimized
◎ Signal radiation effect is minimized
◎ Near channel interference is minimized
◎ All of the above
Answer. All of the above
15. Selection of thermocouple is based on?
◎ Temperature range
◎ Chemical resistance of thermocouple
◎ Abrasion and vibration resistance
◎ All of the above
Answer. All of the above
16. The disadvantage of digital storage oscilloscope is?
◎ It cannot have multiple channels
◎ It shows confusing objects
◎ It cannot show low rate quantities
◎ Peak detection is not possible in it
Answer. It shows confusing objects
17. The disadvantage of inductive transducer is?
◎ Getting easily affected by scattered magnetic field
◎ Performance getting affected by vibration
◎ Does not work successfully with DC power supply
◎ All of the above
Answer. All of the above
18. SATA connector is used to connect ………?
◎ Keyboard to computer
◎ Hard disk to motherboard
◎ Mouse to computer
◎ Printer to computer
Answer. Hard disk to motherboard
19. The advantage of conventional AM over DSB-Sc is?
◎ Easy modulation and demodulation
◎ Bandwidth saving
◎ Power saving
◎ All of the above
Answer. Easy modulation and demodulation
20. Marking of contactors is based on?
◎ Maximum fault current tolerance
◎ Duty cycle
◎ Coil voltage
◎ All of the above
Answer. All of the above
21. The demerit of thermistor is?
◎ Temperature-resistance curve is highly non-linear
◎ Very less sensitive
◎ Very expensive
◎ Large size
Answer. The temperature-resistance curve is highly nonlinear
22. The mechanical connection of a splice or connector to a conductor is called?
◎ Contacting
◎ Crimping
◎ Connecting
◎ Fusing
Answer. Crimping
23. Which of the following is used in FM broadcasting?
◎ Ground wave transmission
◎ Sky wave transmission
◎ Visual line transmission
◎ All of the above
Answer. Visual line transmission
24. In a single phase capacitor run motor
◎ The capacitor is connected in series with the main enclosure
◎ The capacitor is connected in parallel with the main enclosure
◎ The capacitor is connected in series with the auxiliary enclosure
◎ There is no auxiliary enclosure
Answer. The capacitor is connected in series with the auxiliary enclosure
25. Any medium wave broadcasting station uses?
◎ Ionospheric transmission
◎ Ground wave transmission
◎ Tropospheric transmission
◎ Visual line transmission
Answer. Ground wave transmission
26. A good resistance wire strain gauge should have?
◎ High value of gauge factor
◎ Low value of gauge factor
◎ High temperature-resistance factor
◎ High connecting end resistance
Answer. High value of gauge factor
27. What is the main advantage of FM broadcasting compared to AM broadcasting?
◎ Signals can be broadcast over long distances
◎ High power broadcasting is possible
◎ Low bandwidth required
◎ Less affected by additive noise
Answer. Less affected by additive noise
28. The flux material used in the soldering process is?
◎ Highly corrosive at room temperature
◎ Highly corrosive at the melting temperature of the solder
◎ Produces an oxide layer before soldering
◎ Low corrosive material and produces an oxide layer on the surface before soldering
Answer. Highly corrosive at the melting temperature of the solder
29. The most commonly used connector with thin coaxial cables is?
◎ BNC
◎ RJ 45
◎ RJ 11
◎ Vampire tap
Answer. BNC
30. T-18-1 soldering iron I – type tip is used for?
◎ For soldering of micro parts
◎ For soldering of power electronic devices
◎ For pre-tinning of lead wires
◎ For modifying joints
Answer. For soldering of micro parts
31. Local oscillator and mixer are used in?
◎ Tuned radio frequency receiver
◎ Super heterodyne receiver
◎ Sampling
◎ Demultiplexing
Answer. Super heterodyne receiver
32. ANSI/ESD Sl.1 standard is related to?
◎ Evaluation, acceptance and operational testing of wrist straps
◎ Evaluation, acceptance of air ionization device
◎ Electrostatic discharge sensitivity in human body test style
◎ Periodic certification of air ionizer
Answer. Evaluation, acceptance and operational testing of wrist straps
33. The modulation technique which occupies minimum bandwidth is?
◎ AM
◎ FM
◎ DSB-SC
◎ SSB-SC
Answer. SSB-SC
34. In PAM, if the signal frequency is 4kHz, then the sampling frequency will be?
◎ More than or equal to 8 kHz
◎ More than or equal to 4 kHz
◎ Equal to 4 kHz
◎ Less than 8 kHz
Answer. More than or equal to 8 kHz
35. Demodulation of FM signals is done by?
◎ By envelope detector
◎ By multiplier and filtering
◎ By integration and filtering
◎ By ratio discriminator
Answer. By ratio discriminator
36. What is the advantage of superheterodyne receiver?
◎ Simple circuit
◎ No shadow frequency problem
◎ Good frequency selectivity and stability
◎ All of the above
Answer. Good frequency selectivity and stability
37. In a single phase split phase induction motor-
◎ Main sheath and auxiliary sheath are displaced at 90 degree phase difference
◎ Main sheath and auxiliary sheath are displaced at 180 degree phase difference
◎ Auxiliary sheath is thick copper wire
◎ R/X ratio of auxiliary sheath is as follows
Answer. Main sheath and auxiliary sheath are displaced at 90 degree phase difference
38. The signal transmitted in time divided multiplexing is?
◎ AM signal
◎ FM signal
◎ PM signal
◎ PAM signal
Answer. PAM signal
39. In a digital storage oscilloscope, the trigger controller determines?
◎ Sharpness of the wave shape
◎ At what time the oscilloscope accepts and displays the data
◎ Scale factor
◎ Sharpness of the wave shape
Answer. At what time the oscilloscope accepts and displays the data
40. Reed contacts/switches are used in?
◎ Capacitor type proximity switches
◎ Magnetic tape type proximity switches
◎ Piezo electric type proximity switches
◎ Inductive type proximity switches
Answer. Magnetic tape type proximity switches
41. The number of register banks in 8051 and the number of registers in each bank are?
◎ 4 and 8
◎ 8 and 4
◎ 4 and 4
◎ 8 and 8
Answer. 4 and 8
42. The most commonly used fluid for removing residual flux in PCB is?
◎ Discharged water
◎ Petrol
◎ Kerosene oil
◎ Isopropyl alcohol
Answer. Isopropyl alcohol
43. Capacitor The function of current capacitor in a running motor is?
◎ To improve the power factor
◎ To increase the overload capacity
◎ To reduce the variations in torque
◎ To improve the torque
Answer. To improve the power factor
44. Wire wrapping is used in?
◎ In large scale production of PCB based power circuits
◎ In the manufacture of prototype circuits
◎ In circuits based on very small parts
◎ In large scale IC based circuits
Answer. In the manufacture of prototype circuits
45. Commercial FM broadcasting centres use …….. bandwidth?
◎ 10 kHz
◎ 15 kHz
◎ 200 kHz
◎ 1 M Hz Q
Answer. 200 kHz
46. Resettable fuses are used in areas where
◎ Fuses can be easily reset
◎ Resettlement of fuses is difficult
◎ Very high power is involved
◎ A thermometer is required
Answer. Resettlement of fuses is difficult
47. When external memory is connected to 5051 microcontroller, the address of the memory is obtained from ………..
◎ Port 0 and Port 1
◎ Port 0 and Port 2
◎ Port 2 and Port 3
◎ Port 1 and Port 2
Answer. Port 0 and Port 2
48. 8051 microcontroller register which is not SFR?
◎ PCON
◎ SCON
◎ SBUF
◎ PC
Answer. PC
49. Pt – 100 is a
◎ RTD
◎ Thermistor
◎ Thermocouple
◎ Thermopile
Answer. RTD
50. Which method should not be adopted to reduce ESD?
◎ Use grounded static wrist strap
◎ Use synthetic material to clean PCB
◎ Use non-static forming spray to clean PCB
◎ Use static floor mats where work has to be done on circuits
Answer. Use synthetic material to clean PCB
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