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Wednesday, 7 March 2018

Questions and Answers for Electro Technical Officer(ETO) Exam

Multiple choice Questions and answer for ETO COC (Certificate for Competency) exam.

1. The 80W bulb is connected in series with a heater. If the 80W bulb is replaced by a 50W bulb, the heater output will ____.

a) Decrease
b) Increase
c) Show no changes
d) None of the above

2) Find out the color code for a 220 ohm, 5% resistor?

a) Orange, Orange, Black, Gold
b) Red, Red, Brown, Silver
c) Red, Red, Brown, Gold
d) Red, Red, Black, Gold

3) The AC circuits possess characteristics of capacitance, resistance and Inductance. The capacitive reactance of a circuit is expressed in  _____.

a) Mhos
b) Farads
c) Ohms
d) Henry

4) The circuit which is in series. Which value will remain unchanged at all places in the circuit?

a) Current
b) Inductance
c) Voltage
d) Resistance

5) What is the measuring unit of Inductance is ________.

a) Ohm
b) Celsius
c) Henry
d) Farad

6. What produces current in semiconductor?

a) Neutrons
b) Holes
c) Electrons and Holes
d) Protons

7. The Induced voltage across a stationary conductor in a steady magnetic field is zero.

a) True
b) False
c) Infinite

8. A 3 phase 440V AC motor is started and produces 50 HP when running at its rated speed with rated load. How much will the KW meter reading increase for a single generator providing power?

a) 18.65
b) 37.38
c) 25.65
d) 50

9. Choose best method for cleaning dust and foreign particles from low power equipment while limiting damage to their electric components?

a) Blowing a high-velocity stream of compressed air rapidly across the component.
b) Using carbon tetrachloride as a cleaning solvent to clean the components.
c) Carefully wipe off the components with a soft cotton rag
d) Using a vacuum cleaner to remove debris from the components.

10. What are the precautions should be taken when cleaning the windings of a motor with compressed air?

a) Ensure that the circuit breaker is opened and tagged on the feeder panel.
b) Open the machine on both ends so as to allow the air and dust to escape.
c) Ensure that the air is clean and as dry as possible.
d) All of the above


1. Decrease
2. Red, Red, Brown, Gold
3. Ohms
4. Current
5. Henry
6. Electrons and Holes
7. True
8. 37.38
9. Using a vacuum cleaner to remove debris from the components.
10. All of the above

Share your answers in the comments box. #cocexam #eto


  1. Appreciate your efforts; Very informative questions; give us more of such...

  2. Provide more questions of eto coc examination

  3. Work for eto Coc exam is highly appreciated


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