Basic PCB Design MCQ
1. Polymeric materials exhibit a very high resistance to
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2. To reduce the skin-effect losses, what is required to be done.
Answer
Correct Answer:
None of the above
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3. In the component code used in the circuit diagram, by which letter, according to ANSI, is an integrated circuit represented?
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4. The absolute dimensional accuracy of a film master is determined by
Answer
Correct Answer:
All of the above
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5. All the processing steps for manufacturing ultra thin foils except ____are conventional.
Answer
Correct Answer:
aluminium foil removal
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6. Multiwire boards are used in
Answer
Correct Answer:
the implementation of high density electronic circuits
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7. Which of the following is a mechanical machining operation on PCBs?
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Correct Answer:
All of the above
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8. The inks used in screen printing are mostly
Answer
Correct Answer:
vinyl based
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9. Which of the following is a characteristic parameter of a photographic material?
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Correct Answer:
All of the above
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10. In which of the following processes is porosity test done?
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11. Which of the following is a disadvantage of a solder mask?
Answer
Correct Answer:
Its capability with the flux has to be verified before use
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12. Which of the following is a coating process for wet film resists?
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Correct Answer:
All of the above
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13. Which of the following is a solderability test method?
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Correct Answer:
All of the above
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14. Under etching can be minimized by keeping the etching time _____.
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Correct Answer:
as short as possible
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15. It is a common experience of electronic circuit designers that at high frequency{>10 MHz), amplifiers behave as _____.
Answer
Correct Answer:
oscillators
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16. What would be the simplest and most suitable remedy for electro-magnetic coupling between two wires?
Answer
Correct Answer:
To twist the both wires
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17. If Ohmic losses are neglected, the wave impedance Zw in a homogenous material can be calculated by using the formula.
Answer
Correct Answer:
Zw =(L/C)1/2
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18. The fundamental principle of electrolysis is understood from
Answer
Correct Answer:
Faraday's law
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19. How much copper surface is reserved on multilayer boards for the solderability test?
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20. The biggest disadvantage of flexible PCBs is that
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Correct Answer:
they are not suitable for high frequency applications
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21. Fabrication of PCBs for microwave use requires
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Correct Answer:
VSWR exactly 1
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22. Under which of the following conditions is a multilayers board used?
Answer
Correct Answer:
All of the above
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23. Which of the following is a type of soldering fluxes?
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Correct Answer:
All of the above
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24. If a ground line is kept close to a signal line, crosstalk would be _____.
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25. To overcome the motorboating effect, we must _____.
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Correct Answer:
do decoupling of power supply conductors with sufficiently large capacitors
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26. On a PCB, the low power part and the high power part have to be spread sufficiently to avoid _____.
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Correct Answer:
capacitive and inductive coupling between power circuits
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27. hich of the following can be called multilayer construction?
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Correct Answer:
All of the above
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28. Crosstalk is much less dangerous in which of the following.
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Correct Answer:
CMOS -ICs
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29. The microstrip line is derived from a _____.
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Correct Answer:
conductor above the ground
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30. Which size of rack is used as a standard rack in PCB design?
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31. Removing the resists from the board in photo printing is called
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Correct Answer:
stripping
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32. By which material is the transfer of the conductor pattern from the film master on to the copper clad base material done?
Answer
Correct Answer:
Both a and c
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33. The skin-effect losses are sometimes also called
Answer
Correct Answer:
conductor losses
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34. Which of the following tests is done for quality control for multilayer boards?
Answer
Correct Answer:
All of the above
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35. Current spikes in TTL circuit boards can be eliminated by which technique.
Answer
Correct Answer:
using a ground line
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36. Ultra thin copper foil has a range of thickness varying from
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37. Which of the following is not a basic ingredient of a copper clad laminate?
Answer
Correct Answer:
Silver foil
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38. Which of the following is a base material used in the manufacturing of flexible PCBs?
Answer
Correct Answer:
Epoxy resin
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39. In which of the following ways can the required quantity of heat for the melting of the solder be supplied?
Answer
Correct Answer:
All of the above
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40. Ferric chloride is used in PCB designing as a/an _____.
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41. The biggest problem associated with striplines and microstrip lines is the
Answer
Correct Answer:
high attenuation per unit length
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42. A standard hole(0.8mm) in a PCB design is represented by which symbol.
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43. The volume resistivity of a laminate is given by
Answer
Correct Answer:
R*A / l R- resistance measured
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44. For the etching process, the temperature should preferably be around
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45. Which of the following is a category of dry film resists?
Answer
Correct Answer:
Solvent developing dry film resists
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46. Which of the following is not a solder alloy?
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Correct Answer:
Iron lead
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47. By which material is the typical resin/filler laminate of ordinary PCBs replaced in metal core boards?
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Correct Answer:
Sheet metal covered with insulation material
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48. Which of the following is a technique for the generation of the circuit pattern on metal core boards?
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Correct Answer:
Both a and b
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49. Which of the following techniques is used in mass soldering?
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Correct Answer:
All of the above
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50. The dielectric constant of any material is also referred to as _____.
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Correct Answer:
permittivity
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51. Copper plating is done in multilayer boards to _____.
Answer
Correct Answer:
withstand thermal shock due to soldering
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52. In fast signal or high – speed logic circuits , the conductors are considered to be _____.
Answer
Correct Answer:
transmission lines
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53. Which of the following is not a physical characteristic of a copper clad laminate?
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54. A conductor in a printed circuit should be considered a transmission line if its length l (in meters) is
Answer
Correct Answer:
l > Tr/100 nsec ( Tr- rise time of pulse)
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55. What is hot air leveling used for?
Answer
Correct Answer:
PCB finishing
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56. Self soldering or soldering generally implies that the joining process occurs at temperatures below
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57. Which of the following is a design constraint for the design of the flexible PCBs?
Answer
Correct Answer:
All of the above
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58. Which of the following is not a machine cleaning process for boards?
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59. Screen printing is used in _____.
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Correct Answer:
screen printing
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60. Large values of wave impedance call for _____.
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Correct Answer:
thin signal conductors
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61. For TTL , we require a wave impedance of_____.
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Correct Answer:
100-150ohm
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62. In the layout approach, a 'Puppet' is used for_____.
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Correct Answer:
any commonly used electronic component
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63. Parasitic effects influence the working of a PCB.
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64. Etch back is a technique by which ______.
Answer
Correct Answer:
epoxy smear is removed and the exposed glass fibers prepared for copper deposition
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65. When two transmission lines are placed close to each other, they are said to be coupled. This coupling can be used to built
Answer
Correct Answer:
All of the above
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66. The analog and the digital circuit on the same PCB should have _____.
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Correct Answer:
independent ground conductor networks
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67. Which one of the following is not a plating technique?
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Correct Answer:
Hard plating
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68. Which of the following is not a film used in PCB design?
Answer
Correct Answer:
A copper film
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PCB Design MCQs | Topic-wise
