ITI Electronic Mechanic 4th 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 4th 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 3rd Semester Exam Paper
ITI Electronic Mechanic 4th Semester Exam Papers
1. The core material in typical lead-based solder used for soldering electronic components is?
◎ Acid core
◎ Rosin core
◎ Germanium core
◎ Wax core
Answer. Rosin core
2. Computer network cable that supports very high data rates and is less affected by electromagnet radiation is called?
◎ Coaxial cable
◎ Shielded twisted pair
◎ Wave guides
◎ Optical fibre cable
Answer. Optical fibre cable
3. A coil having inductance of 0.1H and resistance 10 2 ohm is connected in series with a capacitor of 0.1 pf. What will be the approximate quality factor of the circuit on simulation?
◎ 200
◎ 400
◎ 100
◎ 50
Answer. 100
4. The ratio of the maximum value of alternating current or voltage to its effective value is called which of the following?
◎ Form factor
◎ Peak factor
◎ Leakage factor
◎ Ripple factor
Answer. Peak factor
5. The maximum rectification efficiency of full wave rectifier is –
◎ 40.8%
◎ 81.2%
◎ 92%
◎ 98%
Answer. 81.2%
6. Which of the following cells is rechargeable?
◎ Aluminium ion battery
◎ Silver oxide battery
◎ Zinc chloride battery
◎ Lithium ion battery
Answer. Lithium ion battery
7. High frequency transformers use ferrite core because it
has ◎ high specific density
◎ high resistance
◎ high hysteresis
◎ low permeability
Answer. Has high resistance
8. Two resistors are connected in parallel with a 2V battery and the current drawn from the battery is 2A. If one of the resistors is removed, the current becomes 1.5A. What will be the resistance of the removed resistor?
◎ 2 Ω
◎ 4 Ω
◎ 1 Ω
◎ 0.5 Ω
Answer. 4 Ω
9. Cells are connected in parallel to ……….
◎ To increase capacity
◎ To increase voltage output
◎ To increase current capacity
◎ To increase internal resistance
Answer. To increase current capacity
10. The ratio of the maximum value of alternating current or voltage to its effective value is called which of the following?
◎ Form Factor
◎ Peak Factor
◎ Leakage Factor
◎ Ripple Factor
Answer. Peak Factor
11. In MS-WORD, if you want to change the typeface and character size in a document, then which of the following menus will you have to select?
◎ Edit
◎ View
◎ Format
◎ Tools
Answer. Format
12. Which of the following diodes is used to obtain a stable reference voltage?
◎ Varactor Diode
◎ Zener Diode
◎ Tunnel Diode
◎ Schottky Diode
Answer. Zener Diode
13. If the number of valence electrons of an atom in a substance is less than 4, then the substance is called ……….
◎ Conductor
◎ Insulator
◎ Semiconductor
◎ None of these
Answer. Conductor
14. Which of the following devices can be used to protect electrical equipment from sudden increase or decrease in voltage?
◎ Tunnel diode
◎ Switching diode
◎ Varactor diode
◎ Schottky diode
Answer. Varactor diode
15. A semiconductor coated with heavy varnish will have
◎ High resistivity
◎ Low resistivity
◎ No change in the properties of the semiconductor
◎ More thermal dissipation
Answer. 16. At what frequency will the current in a series RLC circuit reach its maximum value for a given voltage of 15 V with R = 500 ᘯ, L = 100 and C = 0.001 μF?
◎ 503 kHz
◎ 403 kHz
◎ 603 kHz
◎ 303 kHz
Answer. 503 kHz
17. A coil of inductance 0.1H and resistance 10 ᘯ is connected in series with a capacitor of 0.1 μF. What will be the approximately quality factor of the circuit at simulation?
◎ 200
◎ 400
◎ 100
◎ 50
Answer. 100
18. Transformer core is laminated for………….
◎ To reduce hysteresis loss
◎ To reduce eddy current
◎ To reduce copper loss
◎ To reduce all of the above
Answer. To reduce all of the above
19. Which of the following cells is rechargeable?
◎ Aluminium ion battery
◎ Silver oxide battery
◎ Zinc chloride battery
◎ Lithium ion battery
Answer. Lithium ion battery
20. In a series RLC circuit, increase in frequency will always result in?
◎ Decreased resistance
◎ Increased resistance
◎ Change in inductive and capacitive reactance
◎ Impedance will always decrease
Answer. Change in inductive and capacitive reactance
21. In MS-WORD, from which menu you can insert header and footer?
◎ Format
◎ View
◎ Tools
◎ Insert
Answer. View
22. If the length of wire of resistance R is uniformly drawn ‘n’ times its original value, then its new resistance will be?
◎ nR
◎ n2R
◎ R/n
◎ R/n2
Answer. n2R
23. The peak inverse voltage of a full wave centre tapped rectifier circuit is equal to ………. of the input signal.
◎ Three times the peak
◎ Twice the peak
◎ One fourth of the peak
◎ One third of the peak
Answer. Twice the peak
24. Three 9mH inductors are connected in parallel, assuming there is no mutual inductance between them, the total inductance will be?
◎ 3 mH
◎ 9 mH
◎ 27 mH
◎ 0.33 mH
Answer. 3 mH
25. When measuring current in a circuit operated by 18 V battery, the ammeter gives a reading of 40 mA. Then the current drops to 20 mA. What will be the change in voltage?
◎ 900 mV
◎ 9 V
◎ 18 V
◎ OV
Answer. 9 V
26. If all other factors remain unchanged, what is the effect on increasing the wire gauge from SWG 22 to SWG 26?
◎ Impedance will decrease
◎ Resistance will decrease
◎ Impedance will increase
◎ Capacitance will increase
Answer. Resistance will decrease
27. The device which forwards packets to different networks in an appropriate manner is called?
◎ Bridge
◎ Router
◎ Hub
◎ Transponder
Answer. Router
28. A coil of 5 mH inductance and 10 ᘯ resistance is connected in series with a 5 μF capacitor. The circuit resonates at ………. frequency.
◎ 1.0065 kHz
◎ 2.125 kHz
◎ 4.5 kHz
◎ 10 kHz
Answer. 1.0065 kHz
29. If the input frequency of a full wave rectifier is 100 Hz, the ripple frequency at the output of the filter will be?
◎ 100 Hz
◎ 200 Hz
◎ 400 Hz
◎ 50 Hz
Answer. 200 Hz
30. A 1 kΩ, 1 Watt resistor can safely pass ………. current.
◎ 30 mA
◎ 60 mA
◎ 40 mA
◎ 100 mA
Answer. 30 mA
31. In MS-WORD, by pressing the F8 key three times ………. gets selected.
◎ A paragraph
◎ A sentence
◎ A word
◎ Entire document
Answer. One sentence
32. In EXCEL, getting data from cells located in different sheet is called which of the following?
◎ Accessing
◎ Referencing
◎ Updating
◎ Data acquiring
Answer. Referencing
33. In typical lead based solder, what is the percentage of tin and lead?
◎ 60%, 40%
◎ 40%, 60%
◎ 20%, 80%
◎ 30%, 70%
Answer. 60%, 40%
34. Which of the following diodes has negative resistance region and is widely used in the design of high frequency oscillators?
◎ Zener diode
◎ Tunnel diode
◎ Schottky diode
◎ Varactor diode
Answer. Tunnel diode
35. Which of the following capacitors is suitable for DC filter circuits?
◎ Mica
◎ Ceramic
◎ Paper
◎ Electrolytic
Answer. Electrolytic
36. IC 723 is?
◎ Fixed output voltage regulator
◎ Variable output voltage regulator
◎ Operational amplifier
◎ Voltage controlled oscillator
Answer. Variable output voltage regulator
37. Gang capacitor is a variable capacitor in which capacitance varies with change in ……….
◎ Dielectric
◎ Number of plates
◎ Area of plates
◎ Distance between plates
Answer. Area of plates
38. Which option of EXCEL can be used to split a window into two parts?
◎ Format->windows
◎ View->windows->Split
◎ Window->Split
◎ View->Split
Answer. Window->Split
39. The wattage range of a typical soldering gun used for soldering analog electronic components is?
◎ 25W to 100W
◎ 250W to 500w
◎ 100W to 500W
◎ 250W to 1000W
Answer. 25W to 100W
40. When the electric field in the depletion region of PNN increases to the extent where it can break covalent bonds and create electron – hole pairs, we know it as?
◎ Avalanche breakdown
◎ Zener breakdown
◎ Diffusion breakdown
◎ Covalent breakdown
Answer. Zener breakdown
41. An ohm meter is connected across an inductor and its pointer shows zero ohms. The inductor is?
◎ Open
◎ Good
◎ Short
◎ Partially shorted
Answer. Short
42. Air core inductors are characterized by?
◎ They have high core loss
◎ They have higher inductance than similar ferrite core inductors
◎ They can be used in low frequency applications
◎ They can be used in high frequency applications
Answer. They can be used in high frequency applications
43. What will happen if the primary of a transformer is connected to a DC supply?
◎ The transformer will run with low efficiency
◎ Output voltage will decrease
◎ Output current will decrease
◎ The transformer may burn giving smoke
Answer. The transformer may burn giving out smoke
44. On right clicking on any item on the desktop using the mouse
◎ A list will appear from which we can select the task to be performed
◎ We can select that item
◎ We can open that item
◎ We can close that item
Answer. A list will appear from which we can select the task to be performed
45. Which of the following is not an Internet search engine?
◎ MS-Access
◎ FireFox
◎ Both a and b
◎ Bing
Answer. Both a and b
46. In RL series circuit
◎ Current lags the voltage by less than 90°
◎ Current lags the voltage up to 180°
◎ Current lags the voltage up to 90°
◎ Current leads the voltage by less than 90°
Answer. The current lags the voltage by less than 90°
47. What is the peak voltage of a sine wave measured at 220V AC?
◎ 155 V
◎ 169 V
◎ 311 V
◎ 440 V
Answer. 311 V
48. In intrinsic semiconductors at normal temperature:
◎ There are no holes
◎ There are no free electrons
◎ The number of holes is less than the number of free electrons
◎ The number of free electrons and the number of holes are the same
Answer. There are no free electrons
49. What is the port called in which most of the modem devices such as external hard disk, printer, scanner and mouse can be connected?
◎ PS/2 port
◎ Parallel port
◎ USB port
◎ VGA port
Answer. USB port
50. Modems in computers are connected through ……….
◎ USB port
◎ RJ45 port
◎ Both a and b
◎ VGA port
Answer. Both a and b
51. Resistors with colour bands in the body are generally ……….
◎ Wire wound resistor
◎ Carbon compound resistor
◎ Potentiometer
◎ Rheostat
Answer. Carbon compound resistor
52. The leads of a multimeter are connected to a diode as follows. The red lead is connected at the end having marking band (cathode) of the diode and the black lead is connected at the other end. What does the reading – 0.6 indicate?
◎ Forward bias leads are connected with proper polarity
◎ Reverse bias leads are connected with proper polarity
◎ Forward bias
leads are connected with reverse polarity ◎ Reverse bias leads are
connected with reverse polarity Answer. Forward bias leads are connected with reverse polarity
53. Cells are connected in parallel to
◎ Increase capacity
◎ Increase voltage output
◎ Increase current capacitance
◎ Increase internal resistance
Answer. Increase current capacitance
54. Maximum leakage flux can be obtained by using …………
◎ Air core inductor
◎ Silicon steel core inductor
◎ Ferrite rod inductor
◎ Toroidal core inductor
Answer. Toroidal core inductor
55. A semiconductor coated with excessive varnish will have
◎ High resistivity
◎ Low resistivity
◎ No change in the properties of the semiconductor
◎ More heat dissipation
Answer: Low resistivity
56. A coil of 5 mH inductance and 10 Ω resistance is connected in series with a 5uF capacitor. The circuit resonates at ………. frequency.
◎ 1.0065 kHz
◎ 2.125 kHz
◎ 4.5 kHz
◎ 10 kHz
Answer. 1.0065 kHz
57. If all other factors remain unchanged, what is the effect of increasing the wire gauge from SWG 22 to SWG 26?
◎ Impedance will decrease
◎ Resistance will decrease
◎ Impedance will increase
◎ Capacitance will increase
Answer. Resistance will decrease
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