Transformer Interview Questions With Answer
Hello Friends. How are you ? We shared a lot of interview questions on electrical machines, power system and power electronics. Today we are sharing interview questions on transformer. These transformer interview questions is collected from various sources. lets start transformer interview...
Electrical Engineering interview questions and answers Part 17
Why star delta starter is preferred with induction motor? Star delta starter is preferred with induction motor due to following reasons: • Starting current is reduced 3-4 times of the direct current due to which voltage drops and hence it causes less losses. • Star delta starter circuit...
Electrical Interview questions Part 16
Q: Do you know the advantages of speed controlusing thyristor?A: Advantages: 1. Fast Switching Characterstics than Mosfet, BJT, IGBT 2. Low cost 3. Higher Accurate.Q: Name the different types ofmotors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills,...
Electrical Interview questions Part 15
Q:Why link is provided in neutral of an ac circuit and fuse in phase of ac circuit? A:Link is provided at a Neutral common point in the circuit from which various connection are taken for the individualcontrol circuit and so it is given in a link form to withstand high Amps. But in the case...
Electrical Interview questions Part 14
Q: How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil? A: It's possible with Electronic choke. otherwise it's not possible to ionize the particles in tube. light, with normal voltage. Q:What types domain of Laplace transforms? What behavior can Laplace transform predict...
Electrical Interview questions Part 13
Q:How to determine alternating current frequency? A:Zero crossings of the sine wave to trigger a monostable (pulse generator) is a way to determine alternating current frequency. A fixed width pulse is generated for each cycle. Thus there are "n" pulses per second, each with with a constant energy....
Electrical Interview questions Part 12
Query:Difference between megger test equipment and contact resistance meter test instruments? Resolution: Megger test equipment used to measure cable electric resistance, conductor continuity, phase identification where as contact resistance meter test instruments used to measure low resistance...
Electrical Interview questions Part 11
Query:What is the function of interposing current transformer? Resolution:The main function of an interposing current transformer is to balance the currents supplied to the relay where there would otherwise be an imbalance due to the ratios of the main current transformers. Interposing...
Electrical Interview questions Part 10
Q:How do you select a cable size (Cu & Al) for a particular load? A:At first calculate the electrical current of the load, after that derate the electrical current considering derating factor(depending on site condition and laying of cable) after choose the cable size from cable catalog considering...
Electrical Inteview questions Part 9
Query:What is the count of hvdc transmission lines in India? Resolution:At present there are three hvdc transmission lines in india 1)chandrapur to padghe(mumbai)--(1500 MW at ±500 kV DC) 2)rehand to delhi (1500 MW at ±500 kV DC) 3)talchal to kolar (2500 MW) Query:What is meant by regenerative...
Electrical Interview questions Part 8
Q:What is the difference between Isolator and Circuit Breaker?A:Isolator is a off load device which is used for isolating the downstream circuits from upstream circuits for the reason of any maintenance on downstream circuits. it is manually operated and does not contain any solenoid unlike circuit...
Electrical Interview questions Part 7
Q:What happens if i connect a capacitor to a generator load? A:Connecting a capacitor across a generator always improves powerfactor,but it will help depends up on the engine capacity of the alternator,other wise the alternator will be over loaded due to the extra watts consumed due to the improvement...
Electrical Interview questions Part 6
Q:Why syn. generators r used for the production of electricity? A:synchronous machines have capability to work on different power factor(or say different imaginary power varying the field emf. Hence syn. generators r used for the production of electricity. Q:What is the difference between synchronous...
Electrical Interview questions Part 5
Q:Give two basic speed control scheme of DC shunt motor? A:1. By using flux control method:in this method a rheostat is connected across the field winding to control the field current.so by changing the current the flux produced by the field winding can be changed, and since speed is inversely...
Electrical Interview questions Part 4
Q:What will happen when power factor is leading in distribution of power? A:If their is high power factor, i.e if the power factor is close to one: 1.losses in form of heat will be reduced, 2.cable becomes less bulky and easy to carry, and very cheap to afford, & 3. it also reduces over heating...
Electrical Interview questions Part 3
Q:Why, when birds sit on transmission lines or current wires doesn't get shock? A:Its true that if birds touch the single one line (phase or neutral) they don't get electrical shock... if birds touch 2 lines than the circuit is closed and they get electrical shock.. so if a human touch single one...
Electrical Interview questions Part 2
Q:How tube light circuit is connected and how it works? A:A choke is connected in one end of the tube light and a starter is in series with the circuit. When supply is provided ,the starter will interrupt the supply cycle of AC. Due to the sudden change of supply the chock will generate around...
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