Generator Operator Questions And Answers

21⟩ Explain me what can you do to drive the blades of the turbine faster and preventing the damage of the blades?

Steam should be heated to the temperature it is before making it to enter the turbine because superheated steam produces a lot of energy and also prevents the blades from rusting or damaging.

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22⟩ Tell us after the production of electricity, why do we increase the voltage before sending it to the grid?

To avoid the transmission losses.

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23⟩ Tell me why are you the best Power Plant Operator for us?

Because of the knowledge I posses. Interpersonal communications, team work, leadership, courage, unselfishness, loyalty, and dependability.

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24⟩ Explain me what is your greatest strength and how do you feel it will help you in this role?

Attention to detail and problem solving with a good back to anticipate things before they happen.

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25⟩ Explain me how do you define Self Excited Generators?

A d.c. generator whose field magnet winding is supplied current from the output of the generator itself is called a self-excited generator. There are three types of self-excited generators depending upon the manner in which the field winding is connected to the armature,

(i) Series generator - , the field winding is connected in series with armature winding so that whole armature current flows through the field winding as well as the load.

(ii) Shunt generator - , the field winding is connected in parallel with the armature winding so that terminal voltage of the generator is applied across it.

(iii) Compound generator - there are two sets of field windings on each pole—one is in series and the other in parallel with the armature. A compound wound generator may be:

(a) Short Shunt in which only shunt field winding is in parallel with the armature winding

(b) Long Shunt in which shunt field winding is in parallel with both series field and armature winding

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26⟩ Do you know how do you improve Commutation?

Improving commutation means to make current reversal in the short-circuited coil as spark less as possible. This can be done using

(i) Resistance commutation

(ii) E.M.F. commutation

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27⟩ Tell me what is the power factor of an alternator at no load?

At no load Synchronous Impedance of the alternator is responsible for creating angle difference. So it should be zero lagging like inductor.

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28⟩ Explain me will a D.C Shunt Motor operate on an A.C Supply?

The Shunt winding has a large number of turns so that it has appreciable inductance. When A.C is applied to a shunt motor, the large inductive reactance of shunt winding will reduce the field current too much. Consequently, Shunt motor will not usually run on A.C Supply.

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29⟩ Explain what is the difference between Power Transformers and Distribution Transformers?

Those transformers installed at the ending or receiving end of long high voltage transmission lines are the power transformers. The distribution transformers (generally pole mounted) are those installed in the location of the city to provide utilization voltage at the consumer terminals.

☛ Power transformers are used in transmission network of higher voltages for step-up and step down application (400 kV, 200 kV, 110 kV, 66 kV, 33kV) and are generally rated above 200MVA.

☛ Distribution transformers are used for lower voltage distribution networks as a means to end user connectivity. (11kV, 6.6 kV, 3.3 kV, 440V, 230V) and are generally rated less than 200 MVA.

☛ A power transformer usually has one primary and one secondary, and one input and output. A distribution transformer may have one primary and one divided or "Tapped" secondary, or two or more secondaries.

☛ Power transformers generally operate at nearly full – load. However, a distribution transformer operates at light loads during major parts of the day.

☛ The performance of the power transformers is generally judged from commercial efficiency whereas the performance of a distribution transformer is judged from all – day – efficiency.

☛ The rating of a high transformer is many times greater than that of distribution transformer.

☛ In Power Transformer the flux density is higher than the distribution transformer.

☛ Power transformer's primary winding always connected in star and secondary winding in delta while in distribution transformer primary winding connected in delta and secondary in star.

☛ In The Sub station end of the transmission line, The Power Transformer Connection is Star-Delta.( For the purpose of Step down the Voltage Level)

☛ In the star up of the Transmission line (H-T), The Connection of the power Transformer is Delta – Star (For the purpose of Step Up the Voltage Level) But in case of Distribution Transformer, But Generally it is used in there-phase Step down distribution transformer( Delta – Star).

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30⟩ Explain why Negative Feedback is preffered in the Control System?

The role of Feedback in control system is to take the sampled output back to the input and compare output signal with input signal for error ( deviation from the desired result).

Negative Feedback results in the better stability of the system and rejects any disturbance signals and is less sensitive to the parameter variations. Hence in control systems negative feedback is considered.

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31⟩ Tell me why computer humming sound occurred in HT transmission line?

This computer humming sound is coming due to ionization (breakdown of air into charged particles) of air around transmission conductor. This effect is called as Corona effect, and it is considered as power loss.

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32⟩ Explain what are constant and variable losses?

constant losses:

☛ Iron losses,

☛ Mechanical losses,

☛ Shunt field losses

Variable losses:

☛ Copper loss.

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33⟩ Please explain me what is your philosophy towards the work?

Always put forth your best effort. The work you do is a reflection of the person you are.

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34⟩ Explain where do you think one third of the electricity we generate at this power plant, goes?

I will clean the machine and check the level of all fluid to prepare for the next working schedule.

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35⟩ Tell us have you ever come across a situation when the plant went into some technical issues, how did you manage that?

Technical issues are very common in a plant, give an example from your past experience where you successfully managed to overcome a technical issue.

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36⟩ Tell me what will you do when your timed schedule or jobs assigned to the plant fail to meet due to some unforeseen forecast conditions?

This happens generally on every other day in this profession, but the key is not to stay back but move on. I will take some preventive measures to avoid loss of resources.

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37⟩ Explain me when is a crossbleed start indication displayed next to the N3 indication?

If the airspeed is below that recommended for a windmilling start. FCOM 1 70.20.7

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38⟩ Tell us why some cooling towers are 300 feet tall, and others look like a 30 by 30 foot cubicle on top of a building?

They place it usually at top because the higher the altitude the more effecient the cooling tower will be because its colder at high altitude than ground.

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39⟩ Explain what is voltage regulation?

The change in terminal voltage of a generator between full and no load (at constant speed) is called the voltage regulation. It is usually expressed as a percentage of the voltage at full-load.

%Voltage Regulation= (VNL-VFL)/VFL*100

VNL= Terminal voltage of generator at No load.

VFL= Terminal voltage of generator at full load.

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40⟩ Explain me what is the difference between MCB & MCCB, Where it can be used?

MCB is miniature circuit breaker which is thermal operated and use for short circuit protection in small current rating circuit. MCCB moulded case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition.under voltage and under frequency may be inbuilt. Normally it is used where normal current is more than 100A.

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Generator Operator

Home Technical Generator Operator

98 Generator Operator Questions And Answers

21⟩ Explain me what can you do to drive the blades of the turbine faster and preventing the damage of the blades?

22⟩ Tell us after the production of electricity, why do we increase the voltage before sending it to the grid?

23⟩ Tell me why are you the best Power Plant Operator for us?

24⟩ Explain me what is your greatest strength and how do you feel it will help you in this role?

25⟩ Explain me how do you define Self Excited Generators?

26⟩ Do you know how do you improve Commutation?

27⟩ Tell me what is the power factor of an alternator at no load?

28⟩ Explain me will a D.C Shunt Motor operate on an A.C Supply?

29⟩ Explain what is the difference between Power Transformers and Distribution Transformers?

30⟩ Explain why Negative Feedback is preffered in the Control System?

31⟩ Tell me why computer humming sound occurred in HT transmission line?

32⟩ Explain what are constant and variable losses?

33⟩ Please explain me what is your philosophy towards the work?

34⟩ Explain where do you think one third of the electricity we generate at this power plant, goes?

35⟩ Tell us have you ever come across a situation when the plant went into some technical issues, how did you manage that?

36⟩ Tell me what will you do when your timed schedule or jobs assigned to the plant fail to meet due to some unforeseen forecast conditions?

37⟩ Explain me when is a crossbleed start indication displayed next to the N3 indication?

38⟩ Tell us why some cooling towers are 300 feet tall, and others look like a 30 by 30 foot cubicle on top of a building?

39⟩ Explain what is voltage regulation?

40⟩ Explain me what is the difference between MCB & MCCB, Where it can be used?

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Generator Operator

Home Technical Generator Operator

98 Generator Operator Questions And Answers

21⟩ Explain me what can you do to drive the blades of the turbine faster and preventing the damage of the blades?

22⟩ Tell us after the production of electricity, why do we increase the voltage before sending it to the grid?

23⟩ Tell me why are you the best Power Plant Operator for us?

24⟩ Explain me what is your greatest strength and how do you feel it will help you in this role?

25⟩ Explain me how do you define Self Excited Generators?

26⟩ Do you know how do you improve Commutation?

27⟩ Tell me what is the power factor of an alternator at no load?

28⟩ Explain me will a D.C Shunt Motor operate on an A.C Supply?

29⟩ Explain what is the difference between Power Transformers and Distribution Transformers?

30⟩ Explain why Negative Feedback is preffered in the Control System?

31⟩ Tell me why computer humming sound occurred in HT transmission line?

32⟩ Explain what are constant and variable losses?

33⟩ Please explain me what is your philosophy towards the work?

34⟩ Explain where do you think one third of the electricity we generate at this power plant, goes?

35⟩ Tell us have you ever come across a situation when the plant went into some technical issues, how did you manage that?

36⟩ Tell me what will you do when your timed schedule or jobs assigned to the plant fail to meet due to some unforeseen forecast conditions?

37⟩ Explain me when is a crossbleed start indication displayed next to the N3 indication?

38⟩ Tell us why some cooling towers are 300 feet tall, and others look like a 30 by 30 foot cubicle on top of a building?

39⟩ Explain what is voltage regulation?

40⟩ Explain me what is the difference between MCB & MCCB, Where it can be used?

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