DEBRE BIRHAN POLYTECHNIC COLLEGE

DEPARTMENT:- ELECTRICAL – ELECTRONICS TECHNOLOGY

ICS Level 3 Assignment (COC) V1
Part -I-CHOOSE THE CORRECT ANSWER
1. A transformer having 1000 primary turns is connected to a 250V AC supply for a secondary voltage 400V. The
number of secondary turns should be
A) 400
B) 250
C) 1600
D) 1250
2. The starting winding of a single phase motor is placed in the--
A) Rotor
B) Stator
C) Armature
D) Field
3. If a resistor has four color bands brown, black, red and gold. Its resistance value will be
A) 1KΩ
B) 10KΩ
C) 100KΩ
D) 1000KΩ
4. Thermo couple are used for the measurement of
A) Humidity
B) Pressure
C) Temperature
D) Current
5. An electronic component which is used as switching device
A) Capacitor
B) Zener diode
C) Resistor
D) Transistor
6. A transformer transforms
A) Frequency
B) Voltage
C) Current
D) Voltage and current
7. One of the following devices can be used to isolate the control circuit from the load
A) Toggle switch
B) Relay
C) Circuit breaker
D) Rotary switch
8. The aim of preventive maintenance is to
A) Increase the reliability of a tool or equipment
B) Increase the failure rate of tool or equipment
C) Reduce the life span of a tool or equipment
D) Improve the standard quality of a tool or an equipment
9. After completion of rewinding which testing mechanism is correct?
A) A ventilation of rewinding which testing mechanism is correct?
B) Forward/reverse running test
C) Full load test
D) Low voltage test

10. What is the correct PLC operation order

A) Self test → input scan→ logic scan →output scan
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P.by:-Tegegnework Wodaj
 DEBRE BIRHAN POLYTECHNIC COLLEGE
DEPARTMENT:- ELECTRICAL – ELECTRONICS TECHNOLOGY
ICS Level 3 Assignment (COC) V1
B) input scan → self scan → logic scan → output scan
C) logic scan → input scan → self scan → output scan
D) output scan → input scan → self-scan → logic scan
11. Written communication methods may include
A) Discussion
B) Negation
C) Speeches
D) Instructions
12. Among the following sensors which one is the input terminal of the PLC?
A) Speed
B) Linear electrical actuator
C) Solenoids valves on plant system
D) Lighting
13. Transformer cores are laminated in order to:
A) Simplify its construction
B) Minimize eddy current loss
C) Reduce loss
D) Reduce hysteresis’s loss
14. Resistivity of a conductor is mostly affected by
A) Composition
B) Pressure
C) Temperature
D) Current
15. There are 3 identical resistors connected in parallel, the total resistance will be
A) 3 times the individual resistance
B) 2/3 times the individual resistance
C) 1/3 times the individual resistance
D) 4/3 times the individual resistance
16. The responsible person to maintain the quality of work performed by work tea
A) Supervisor
B) All members of the team
C) Worker
D) Quality assurance officer
17. Which of the following will remain the same in all parts of a series circuit?
A) Current
B) Voltage
C) Power
D) Resistance
18. A linear cylinder which develop thrust in one direction only
A) Rotary actuators
B) Single acting cylinder
C) Actuators
D) Double acting cylinder
19. Star-delta starter of an induction motor
A) Insert resistance in rotor circuit
B) Insert resistance in stator circuit
C) Applies reduced voltage to rotor
D) Applies reduced voltage to stator

20. What should you do when a problem arises while you are repairing electronic equipment that you cannot solve by
yourself?
A) Quit repairing
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P.by:-Tegegnework Wodaj
 DEBRE BIRHAN POLYTECHNIC COLLEGE
DEPARTMENT:- ELECTRICAL – ELECTRONICS TECHNOLOGY
ICS Level 3 Assignment (COC) V1
B) Throw it away
C) Ask for assistance
D) Murmuring & crying
21. The power factor of a purely resistive circuit
A) Zero
B) Unity
C) Lagging
D) Leading

Matching

Column <<A>> Column <<B>>

1. --------Which DC motors has approximately constant speed A) Rectifier
2. --------Which types of motors has a high starting torque? B) Spindle motor
3. --------Current limiting device C) Varistor
4. --------Used to store programs & data in computer system D) Memory
5. --------Proper attitude towards work E) Effective communication
6. --------Performance of operation or quality of product or service to F) Initiative
ensure customer satisfaction in monitored G) DC series motor
7. -------Constrictive & encouraging idea for improvement H) Shunt motor
8. -------Voltage transformer I) Feed back
9. -------Current transformer J) Hard disk drive
10. -------Washing machine K) Quality control
11. -------Smoke detector L) Successful team work
12. -------Team members understand how their tasks fit in with other
people’s tasks M)
13. -------Each member co-operating with everyone and assisting others
when they need help
14. ------Pushbutton N)
15. ------Convert AC to pulsating DC voltage
O)

P)

Q)

R)

Answers Part -I-CHOOSE

1. C
2. B
3. A
4. C
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P.by:-Tegegnework Wodaj
 DEBRE BIRHAN POLYTECHNIC COLLEGE
DEPARTMENT:- ELECTRICAL – ELECTRONICS TECHNOLOGY
ICS Level 3 Assignment (COC) V1
5. D
6. D
7. B
8. A Matching
9. D 1. H
10. A 2. G
11. D 3. C
12. A 4. J
13. B 5. F
14. C 6. K
15. C 7. I
16. B 8. R
17. A 9. Q
18. C 10. M
19. D 11. P
20. C 12. E
21. B 13. L
14. N
15. A

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P.by:-Tegegnework Wodaj