Electrical Interview questions Part 2

Electrical Interview questions Part 2
119.What is Transmission Line? How it is used? Give examples?
120.What is PLC? Outline its working Principal?
121.What is Power Factor? How it is calculated?
122.What is the difference between Altrnator & Generator? Outline its working principal?
123.What is meaning of "Motor Frame Size? What is use to determine the motor H.P?
124.It is possible to run one DC machine as a generator or motor purposely? What adjustment we have to do for that operation?
125.Is it possible if their is no voltage then their is no current circulation or does it depend on circuit condition?
126.Why Indian Standard Generation voltage is 11kv?
127.What is the difference betbeen capacitor and condensor?
128.Whats is difference between Earth and Neutral?
129.Why Cable selection depends on Load current?
130.what is the testing of h.t and l.t. motors before erection and commissioning?
131.How does a AC drive work? Why does not AC motors blow up when testing dead short but it would if you put DC on it?
132.Why CTs are connected in star on T/F delta connected winding side & in delta on T/F star connected winding side for T/F differential protection?
133.What is the name of sound when we start the D.G.Sets?
134.Why frequency in India is selected 50Hz?
135.Why do we rate transformer in KVA not in KW?
136.What do you mean power factor? What is the use of Power Factor?
137.Why do we use delta connected capacitor bank in a self excited induction generators and not star connected capacitor bank?
138.What is the difference between a capacitor and a condensor?
139.What do you mean by traction system, What type of traction system is used in electric train?
140.What is difference between potentiometer and rheostat?
141.Why are we employing star type transformer at transmission end and delta type transformer at receiving end?
142.What is the flyback convertor?
143.What is the purpose of Q-point in transistor?
144.What is the purpose of coupling capacitor?
145.Why we cannot use the capacitive load?
146.Whats happens when we give DC to a induction motor?
147.What is Magnetic Levitation ?How MAGLEV (Trains based on Magnetic Levitation) works ?
148.What is the use of control panels in transmission systems?
149.What is the difference between regulator and stabiliser?
150.Why less loss occurs when we use DC supply than AC supply?
151.Explain the operation of a transistor?
152.Difference Between Noise and Attenuation?
153.How much should be the insulation resistance value of a 5KW motor and 50KW motor?
154.What is Synchronous condenser ?
155.What is the effect of pole slipping in generator and how it will slip?
156.Is possible to increase the voltage without using transformer? why?
157.What is the function of a choke in tube light?
158.What is Particle Swam Optimisation?
159.Why is the transformer rated in KVA?
160.Why the generators are made such that they generate only sinusoidal wave?
161.What is the use of SCOTT connections?
162.Why we are using Sinusidol wave in all electrical systems?
163.What is a Transducer?
164.What is the difference between P,PI,PID CONTROLLER?
165.What is the resistance between neutral and earth?
166.What is induction motor?
167.How to find the terminals in SCR? Also in BC327 transistor?
168.What is DIV?What does 100V/DIV or 50A/DIV mean?
169.Does HVDC mode of transmission has an economic advantage over EHV-AC transmission. Justify?
170.What will happen if we apply dc volt across transformer?
171.How do you measure the leakage current in a house wiring?
172.When there is a sudden loss in the demand what happens to the transformer and generation?
173.How to Simulate an Induction motor?
174.How do we select a cable for a machine as per standards. Is there is any standard to select a cable as per voltage, or as per KVA and as per amps ratings?
175.What is the value of reflection co-efficient of tranmission line having VSWR?
176.What is a DSM(Demand Side Management)?
177.What is a u.p.s?
178.What is the purpose of calculating knee point voltage for Current transformers?
179.What is the reason of power development in synchronous generator due to saliency ?
180.How is a 100 MVA transformer cooled?
181.What is the main Electrical IS rules?
182.When we increse load, current drawn from source also increses why ?
183.What is the difference between earth and neutral?
184.What is thyristor?
185.What are the technical reasons for soaking transformers for various times before allowing them to pick?
186.What is watt?
187.What is the instataneous value of voltage in a 3-phase balanced star connected circuit?
188.What is the power ratio between power in Star and Delta circuit?
189.Why Transistors are not used as switching devices?
190.What types of CMOS memories have you designed? What were their size? Speed? Configuration Process technology?
191.What work have you done on full chip Clock and Power distribution? What process technology and budgets were used?
192.What types of I/O have you designed? What were their size? Speed? Configuration? Voltage requirements? Process technology? What package was used and
193.how did you model the package/system? What parasitic effects were considered?
194.What types of high speed CMOS circuits have you designed?
195.What transistor level design tools are you proficient with? What types of designs were they used on?
196.What products have you designed which have entered high volume production?
197.What was your role in the silicon evaluation/product ramp? What tools did you use?
198.If not into production, how far did you follow the design and why did not you see it into production?
199.Whats the use of GNAC(Generator Neutral Accessory Compartment)?
200.Why generator or any other system require Neutral Grounding and not Phase grounding?
201.What happens if any one of the phase is grounded?
202.If 15kv is grounded directly what will happen, why it should not be grounded like that?
203.Use of of NGTR(Neutral Grounding Transformer and Resistor) for grounding is
204.helpfull and how?
205.What is difference between start imitation and start interlock for 3 phase motor protection ?
206.Why for transformer protection we protect tranformer from 3rd hormonics and 5th hormonics and what is the reason of generating these horminics in electrical system?
207.What is meant by Active and reactive power?
208.Why in three phase 440 circuit in all phase current is almost equal L1-35 A,L2-34 A ,L3-31 A but in nutral when i check with clamp meter it shows 25 A?
209.What is mean by derating factor?
210.How can we know cable size for a given current?
211.Explain the working principle of servomotor?
212.Why servomotor and induction motor are in different shape?
213.Whats the diference between Induction motor and servo motor?
214.Why electrical engineering?
215.What is the difference between earthing and grounding?
216.Why transistors are not used as switching devices?
217.Define watt ?
218.How are analog signals converted to digital signals?
219.Explain the differences between a transistor and capacitor ?
220.Describe the functions of a diode?
221.Describe the basic elements of an integrated circuit ?
222.What is a UPS?
223.Describe how energy is stored in an inductor on electronic level?
224.What is the difference between a Verilog task and a Verilog function?
225.What is the difference between a Vera task and a Verilog task?
226.Describe the electrical systems you have worked on and how did you get our training?
227.What is your experience with electrical schematics?
228.What is your experience with ladder logic?
229.Describe the malfunctions you have experienced with PLC hardware?
230.Describe a tough electrical troubleshooting problem you have experienced, and briefly explain the steps you used to solve the problem?
231.What is the difference between a digital signal and an analog signal?
232.How often do you use a personal computer in a typical day? What do you do with it?
233.Describe a process problem you have experienced and how did you solve it?
234.Give an example of a tough loop you had to tune. What were the problems? And how did you solve them?
235.What brands of VFD's are you familiar with?
236.Describe some of the malfunctions associated with VFD's, and give an example of a tough VFD problem you had to solve?
237.Using Ladder logic, write a program that will START and STOP a motor with momentary START and STOP push buttons. (Provide a sheet of paper)?
238.Add ladder logic that will turn the motor OFF after running for two minutes?
239.Describe the steps you take to troubleshoot a 3 phase, 480 volt motor that continually trips the heaters?
240.Why is the earth pin in a 3-pin plug the longest and the thickest?
241.Explain the purpose of grounding?
242.Describe a control panel you wired, designed, or modified. What was the purpose of the panel and state each component you used?
243.Describe the difference between a sourcing input and a sinking input?
244.Why do you want this job?
245.Which transform is more popular in electrical engineering? Fourier transform or Z transforms?
246.In which case the ohms law is not applicable?
247.What is the relation between the current and voltage?
248.Name three theorems used to simplify the circuit?
249.For what purpose is the Gauss theorem used?
250.Suppose two resistances are connected in parallel how will the voltage be distributed?
251.What is Thevenin resistance?
252.What is mutual induction?
253.What is earthing?
254.Do you feel that you are capable for this job?
255.What is mutual induction?
256.What is Thevenin resistance?

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