Electronics Question Paper

Electronics

Course:Diploma In Mechanical Engineering

Institution: Kisumu National Polytechnic question papers

Exam Year:2017

THE KISUMU NATIONAL POLYTECHNIC
DIPLOMA IN MECHANICAL ENGINEERING PLANT & PRODUCTION OPTION
MODULE I SEPTEMBER 2017
END OF TERM EXAMINATIONS
AUE/PLT/DPT/SEP2017
ELECTRONICS
INSTRUCTION; attempt all question in this paper
#3110
Qla) State three limitation of Bohrs postulates
(3mks)
b) Define the following terms
i. doping
ii. atomic number
iii. atomic mass number
(6mks)
c) Using the appropriate energy diagrams, explains the difference between the following;
i. conductors
ii. semiconductors
ii. insùlators
(9mks)
d) Define the following terms
intrinsic semiconductors
ii. extrinsic semiconductors
(2mks)
(2mks)
Q2) D What is the significance of valence electron
ii) Using appropriate diagram, explain covalent bond in intrinsic semiconductor and
how drift current is generated.
(5mks)
ii) Explain the djfference between the following terms and in each case state two
examples
a) trivalent atom
b) tetravalent atom
c) pentavalent
(6mks)
iv) Explain how an intrinsic semiconductor can be doped
to achicve N-type semiconductor
(7mks)
3a) briefly explain the use of the following in a power supply
i. Transformer
ii. Rectifier
iii. Filter
iv. Voltage divider
(4mks)
b) Explain the difference between the following terms
i. Unregulated power supply
ii.Regulated power supply
(4mks)
c) For each of the following, explain using appropriate diagrams and output characteristics
i. Half wave rectifier
ii. Full wave centre tapped transformer rectifier
(12 mks)

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