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Saturday, 24 March 2018

Questions and Answers for Electro Technical Officer(ETO) Exam

Questions and answers for Electro technical officer - ETO. Multiple choice Questions and answer for ETO COC (Certificate for Competency) exam.

A. In the case when a lamp has reached the last of its useful life, it should be replaced immediately, or the resulting flashing may _____

1. Explode, causing the glass to fly in all directions
2. damage the starter and the ballast
3. blown the lamp's circuit breaker
4. short-circuit the ballast transformer

B. In relation to the load type, in what type of AC circuit will the current always lead the voltage?

1. Resistive
2. Inductive
3. Capacitive
4. Resistive and capacitive

C. When 65-ohm resistor is connected to a 3 V battery. What will be the power dissipation of the resistor is ____.

1. 0.2 W
2. 200 W
3. 2 W
4. 0.002 W

D. When the power factor is leading in the circuits, which of the following can be used?

1. Shunt Capacitor
2. Neither Shunt capacitor does not shunt reactor
3. shunt reactor
4. Either Shunt capacitor does not shunt reactor

E. When the current through the coil of an electromagnet is reversed, the directions of the magnetic field is also reversed.

1. True
2. False
3. None of above

F. The opposition to the magnetic lines of force in a magnetic flux is called _____. 

1. Reluctance
2. Inducatnce
3. Resistance
4. Impedence

G. The winding resistance of a coil can be increased by ____ the number of turns or by using a _____ wire.

1. decreasing, thicker
2. decreasing, thinner
3. increasing, thicker
4. increasing, thinner

H. When an AC motor is started and produces 25 horsepower, the KW meter reading will be ____.

1. 25.65 KW
2. 37.65 KW
3. 18.65 KW
4. 30.65 KW

I. Which of the following statements is false about the cleanliness of electric motors?

1. Dirt, oil, grease, and moisture are primary reasons for the deterioration of insulation of the stator windings of a motor.
2. Dry compressed ait at a high pressure can drive in dirt inside windings instead of removing them.
3. The cleanliness of the external body of a totally enclosed motor is important since the body helps to dissipate heat generated.
4. High pressure dry compressed air cleaning is preferred over suction cleaning for stator winding.

J. Which of the following statements best describes the material known as varnished cambric?

1. Cotton cloth coated with insulating varnish
2. Paper with minerals oil, specially wrapped with nonmetallic tape and coated with varnish.
3. Felted asbestos sealed with varnish
4. Rubber insulation coated with a layer of tin.


A. damage the starter and the ballast
B. Capacitive
C. 0.2 W
D. Shunt capacitor
E. True
F. Reluctance
G. Increasing, thinner
H. 18.65 KW
I. High pressure dry compressed air cleaning is preferred over suction cleaning for stator winding.
J. Cotton cloth coated with insulating varnish

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

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  1. Very helpful put on more information

  2. Good set of questions. very informative. Waiting for more to be uploaded.

  3. Good question for eto coc preparation


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