LAGOS CITY POLYTECHNIC, IKEJA
SCHOOL OF ENGINEERING AND APPLIED SCIENCE
DEPARTMENT OF COMPUTER ENGINEERING
2015/2016 SEMESTER EXAMINATION
COURSE
TITLE:
AND REPAIRS
COURSE CODE: EEC 237
FOR WHOM:
ND YR III
ANSWER
ELECTRICAL
EE, CE
ANY
MAINTENANCE
NO OF QUESTIONS : 6
TIME ALLOWED: 2 HRS
PT
INSTRUCTIONS:
4
QUESTIONS
1.
2.
(a)
Draw
(i)
(ii)
(iii)
(iv)
(vi)
symbolic
Resistor
PNP
Diode
Zener
Switch
and
is
diagram
for
the
following
electronic
devices
transistor
diod
(b)
(c)
Menion
What
explain
an
(a)
(b)
(c)
Differentiate
bewteen
Mention
and
state
Differentiate
between
types
of
electronic
passive
functions
elect/elect
elect/elect
maintenance
measuring
instrument?
and
active
devices
of
tools
used
for
repairs
repairs
and
maintenance
3.
(a)
Mention and explain function of 4 power protective devices.
(b)
Mention and state function of tools used for electrical circuit component
desoldering.
(c)
Explain
importance
of
elect/elect
maintenance.
4.
(a)
(b)
(c)
Explain
soldering
and
desolving
procedures
and
maintenance
Differentiate
between
Analog
and
Digital
Multimeter
With aid of symbolic diageram, differentiate between NPN and PNP transistor.
5.
(a)
(b)
(c)
Explain the
Explain
the
Differentiate
6.
(a)
(b)
(c)
Explain
maintenance
steps
for
voltage
Explain
the
step
in
testing
a
rectifies
Explain and mention function of 5 semiconductor devices.
function
function
between
of Automatic Voltage Regulator (AVR)
of Automatic
Voltage
Stabilizer
(AVS)
Electrical
repair
and
troubleshooting
stabilizer
diode