cameroon gce intermediate level 2024 electrical technology and diagram 1

Which of the following materials are good
insulators ?
A PVC, rubber, Gold
PVC, Porcelain, brass
C PVC, silver, brass
D PVC, rubber, Porcelain
t
B
9. The part of cable that protects it from mechanical
damage is the
A Core
B Insulation
C Armor
D Shealth
2. The earthing system in which both the neutral and
masses of equipment are connected to the ground
is termed :
A TT system
B IT system
C TNS system
D TNC system
10. Protection against an earth leakage fault can be
ensured by a
A Classical circuit breaker
B Differential circuit breaker
C Magnetic relay
D Magneto–thermal relay
3. The most appropriate transformer winding
connection for a low voltage distribution network
is :
A Star– Delta
B Star– Star
C Delta– Delta
D Delta – Star 11. The contact of a time switch mounted on a
contactor is observed to open only some time after
the contactor coil was de–magnetized. Specify the
contact and timer.
A Normally open contacts of ON– delay
timer
B Normally closed contacts of OFF– delay
timer
C Normally closed contact of ON– delay
timer
D Normally open contact of OFF– delay
timer
4. Which of the following localities in Cameroon
does not have a hydro– power station ?
A Edea
B Songlulu
C Lagdo
D Yassa
5. For the conduit IRO– APE, the letter A signifies
that the conduit is ;
A Authorized
B Resistant to corrosion
C Non flame propagation
D Water tight
12. When one of the supply phases of a three phase
induction motor fails to supply, the phenomenon
observe is called ;
A Single phasing
B Under voltage
C Unbalanced voltage
D Under voltage
6. Transformers are provided with cooling systems in
order to
A Reduce the ambient temperature
B Reduce the Joule’s losses
C Prevent melting of the winding insulation
D Reduce the humming sound 13. The purpose for earthing electrical installation is
to
7. An advantage to underground transmission of
electrical energy to overhead is that
A It is cheaper
B It is neat
C It can carry higher voltage
D Cables are not exposed to sunlight
A Protect persons from direct contact
B Protect materials and equipment from direct
contact
C Protect persons from indirect contact
D Protect material and equipment from
indirect contact