Soldering machine question paper

 

Multiple choice question (3-marks of each, total 60 marks)

Q1. If LSU has no tin ball what we have to do.

(a) confirm is ball need to fill

(b) add tin ball

(c) move solder nozzle

(d) none of the above

Q2. Which command we have to use if computer screen shows tester is running in background.

(a) alt+tab+esc

(b) shift+ctrl+esc

(c) ctrl+shift+esc

(d) esc+shift+ctrl

Q3. What are the benefits of nitrogen in soldering?

(a) Better wetting

(b) less heat

(c) both A and B

(d) none of the above

Q4. What are the measure concern when clean a laser lens?

(a) follow steps

(b) make sure nitrogen and air pressure is not on

(c) take some time

(d) all of the above

Q5. How much approximate pressure need before to spray ball on module

(a) 1722mbar

(b) 1500mbar

(c) 1054mbar

(d) 2001mbar

Q6. How many main pressure gauges in soldering machine?

(a) 5

(b) 7

(c) 8

(d) 2

Q7. What is the meaning of number1 blue color at the time soldering process on HMI screen?

(a) module is not there

(b) module is there or module pin scanned

(c) module pin is not scanned

(d) none of these

Q8. If nozzle is blocked what we have to do

(a) clean nozzle

(b) change nozzle

(c) add tin ball

(d) all of the above

Q9. What is the meaning of number3 green color at the time soldering process on HMI screen?

(a) pin not detected

(b) soldering is done

(c) module is there

(d) all of the above

Q10. How many main power switches in machine?

(a) 6

(b) 3

(c) 2

(d) 5

Q11. The voltage required for automatic soldering machine.

(a) 330V 50HZ

(b) 350V 60HZ

(C) 250V 60HZ

(d) 220V 50HZ

Q12. LSU stand for.

(a) light scale unit

(b) laser scale unification

(c) laser scanner unit

(d) lead scale unit

Q13.The following picture parameter means.

 

 

 

 

(a) recognize of old

(b) save as new model for PR

(c) both A and B

(d) none of these

Q14. HMI stand for.

(a) human machine interface

(b) human manual interface

(c) home machine initializes

(d) both A and B

Q15. What would you do with module when the machine did not solder the module correctly?

(a) allow module to go

(b) reject module

(c) do hand soldering and make it perfect

(d) all of the above

Q16. Which one is soldering defect from give below?

(a) bulbous joint

(b) cracked joint

(c) both A and B

(d) none of these

Q17. What are the main two main reason for imperfect soldering.

(a) misalignment of laser center

(b) misalignment of ball center

(c) both A and B

(d) none of these

Q18. Why we make PR in soldering machine.

(a) to look good

(b) recognize module pin

(c) take picture

(d) best center

Q19. Why we use sponge in hand soldering.

(a) clean welding tip(bit)

(b) remove shoulder paste

(c) clean camera

(d) to maintain temperature

Q20. Why we use laser in automatic soldering machine.

(a) melting tin ball

(b) spray tin ball

(c) both A and B

(D) none of these

Long answer type question (20-marks of each)

Q1. Explain step by step how to make PR of golden pin in automatic soldering machine.