Electro Technical Officer(ETO) Exam Questions

Examination of Electrical Technical Officer

(Marine Electrotechnology and SSEP)

1. Explain three methods of overcurrent protection for electrical circuits. Explain with the aid of the diagram, the meaning of the term inverse current time characteristic?

2. State the application of the synchronous motors. Discuss how a synchronous motor can function as a synchronous capacitor. Compare synchronous motors with induction motors drives?

3. What is Zener diode and how does it regulate the voltage? What happens to the series current, load current, and Zener current, when the d.c. the input voltage of a Zener regulator increase? Draw a neat diagram of the Zener regulator and explain it? 

4. With Reference to 3-phase transformers

a. Discuss the essential and desirable conditions to be fulfilling for operating two three-phase transformers in parallel.

b. What are the advantages of transformers bank of three 1-phase transformers over a unit three-phase transformers of the same KVA rating?

5. Sketch and describe the main engine shaft driven generator arrangement with an electronic system for frequency correction.

6. With respect to alternator onboard:

a. Briefly explain true power, Apparent power, and power factor?

b. The alternator is rated for 750 KVA at 0.85 PF, what is the maximum load (KW) that can be put on it? Would you be overloading the alternator if the KW reading were now 620 KW and the PF 0.80?

7. Write a short note on “electric shock”?

8. How will you fight a fire in a purifier room? How will you at least restrict the fire if you are the first person to sight the fire in the purifier room?

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Electro Technical Officer(ETO) Exam Questions and Answers

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

1. The seven segment arrangement for a numerical display on consoles, test meters, and other applications can be either ______ ?

a. A BCD or an OCD

b. An LED or an LCD 

c. A UJT or a BJT

d. A JFET or an LCD

2. When checking a good SCR or TRIAC with an ohmmeter it will ____.

a. Display a low resistance with positive on the anode, -ve probe on the cathode and a high resistance when it is reversed

b. Display a low resistance in both directions

c. Display a high resistance in both directions

d.  Display a high resistance with -ve on the anode, +ve probe on the cathode and a low resistance when it is reversed

3. A microprocessor unit, a memory unit, and an input unit form a/ an _____?

a. Complier

b. ALU

c. CPU

d. Microcomputer

4. Which of these sets of logic gates are designated as universal gates?

a. XOR, NOR NAND

b. NOR, NAND, XNOR

c. NOR, NAND

d. OR, NOT, AND

5. When a step input is given to an op-amp integrator, the output will be ____?

a. A sinusoidal wave

b. A triangular wave with DC bias

c. A ramp

d. A rectangular wave 

6. When transistors are used in digital circuits they usually operate in the _____?

a. Breakdown Region

b. Linear region

c. Active region

d. Saturation and cut off regions

7. What minimum energy level will ignite gases falling in group II c?

a. 69 micro J

b. 400 micro J

c. 280  micro J

d. 29 micro J

Answer:

1. An LED or an LCD

2. Display a high resistance in both directions

3. Microcomputer

4. NOR, NAND

5. A ramp

6. Saturation and cut off regions

7. 29 micro J

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Electro Technical Officer(ETO) Exam Questions and Answers

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

1. What happens when a low voltage protection circuit is used in an electric motor's starter to ______ ?

a. Trip the contactor when the motor develops a short circuit due to low voltage

b. Prevent the motor from restarting automatically in case it stops

c. Trip the main contactor when the motor over speeds due to low voltage

d. Allow the motor to restart automatically on the restoration of voltage without manual resetting.

2. What do mean by discoloration of the rotor bars in a squirrel-cage motor is typical evidence of _____ ?

a. Overheating

b. Vibration

c. Moistured

d. All of the above

3. What is the functional name of an electrical device which prevents simultaneous energizing of loads thereby prventing damage or injury?

a. Electrical interlock device

b. Monitoring device

c. Mechanical limit device

d. All of above

4. If a digital multimeter is set up in the resistance mode to test a capacitor, what would the display read if the capacitor is discharged?

a. The ohmic value would initially read very low, but over time the ohmic value would gradually rise to an extremely high value.

b. The ohmic value would read very high.

c. The ohmic value would read very low.

d. The ohmic value would initially very high, but over time it drops to a low value.

5. When an ohmmeter is used to test a semiconductor diode, you find a low resistance in both the forward and reverse bias direction, this indicates that the diode has a/an ____ ?

a. Short

b. Good capacitive quality

c. Open

d. Good resistive quality

6. Which of the listed conditions is an advantage of a PN diode over a vacuum tube?

a. No warm-up time

b. More robust

c. Longer life

d. All of above

7. When troubleshooting most electronic circuits, the loading effects can be minimized by using a voltameter with a/ an _____ ?

a. I/P impedance that is much less than the impedance of the circuit in the voltage is being measured.

b. The sensitivity of more than 1000 V/ohm

c.  I/P impedance that is much greater than the impedance of the circuit in the voltage is being measured.

d. The sensitivity of less than 1000 V/ohm

8. In a Transistor, _______

a. The emitter, Collector, and Base are the basic elements

b. Emitter separates base and Collector

c. PNP and PNP are one the same basic typed

d. Collector separates Base and Emitter

9. An SCR is a solid state device used for what functional purpose?

a. To function like a switching device and control relatively low load current

b. To function as an amplifier and control relatively high load current

c. To function like a switching device and control relatively high load current

d. To function as an amplifier and control relatively low load current

10. Which of the following statement represents an application of an SCR?

a. It is used to sense the flame in an automated burner.

b. It is used to provide DC power for the main propulsion motor.

c. It is used as a voltage reference diode.

d. It is used to eliminate power supply.

Answers:

1. Prevent the motor from restarting automatically in case it stops

2. Overheating

3. Electrical interlock device

4. The ohmic value would initially read very low, but over time the ohmic value would gradually rise to an extremely high value.

5. Short

6. All of above

7. I/P impedance that is much greater than the impedance of the circuit in the voltage is being measured.

8. The emitter, Collector, and Base are the basic elements

9. To function like a switching device and control relatively high load current

10. It is used to provide DC power for the main propulsion motor.

Share your answers in the comments box, for authentic rule and regulation of shipping Industry visit DG Shipping website. #cocexam #eto

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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.

Answers:

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

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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

Answer:

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

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