electrical interview questions and answers pdf

84. 125. Circuit Breaker is one which makes or breaks the circuit.It has two contacts namely fixed contact & moving contact.under normal condition the moving contact comes in contact with fixed contact thereby forming the closed contact for the flow of current. What is a feedback in Control System? What is the use of stepper motor? Define the following: Average demand, Maximum demand, Demand factor, Load factor. Hence the starting current is reduced , the voltage drops during the starting of motor in systems are reduced. List of electrical engineering question and answer pdf for freshers are elaborately provided under the website. What is encoder, how it function? Calculate the voltage drop which will max 3% (resistance and reactance of cable found from What is the difference between MCB & MCCB, Where it can be used? 94. it has to be ideally 1. if it is too low then cable over heating & equipment overloading will occur. A direct-current torque motor is mounted on the same shaft. if it is an ac excitor, out put of ac excitor is rectified by rotating diodes and supply dc to main fixed poles.ac excitor is the ac generator whose field winding are stationary and armature rotates. 23. b. Fuse block. This is a tricky question. Why we use ac system in India why not dc ? and is of sinusoidal in nature…due to polarity change of rotor poles(i,e) N-S-N-S. 69. The relay itself may have up to 24 contact points within the unit itself. Resolution: called on grid systems and they might work on off grid systems that are not connected to the system. The above mentioned are few electrical interview questions and answers. generators r used for the production of electricity. Why the capacitors works on ac only? Dear engineers ... Special Tip: Download the list of questions in a one page long PDF, (print it), ... check all electrical systems, talk to other employees, and make a list of things to repair/improve. Cables, which are used for transmitting power, can be categorized in three forms: 146. 119. 132. Hence syn. Now a day, magnetic traction is also utilised for bullet trains. Resolution:In DC motors, Voltage equation is V=Eb-IaRa (V = Terminal voltage,Eb = Back emf in Motor,Ia = Armature current,Ra = Aramture resistance).At starting, Eb is zero. what its purpose ? e.g; ac servo motor. c. From power stations, AC is produced so it is better to use AC then DC instead of converting it. How do you select a cable size (Cu & Al) for a particular load? They also install solar panels and other equipment for generating power. Output voltage is greater than the input voltage or receiving end voltage is greater than the sending end voltage. AC or Dynamic Resistance: It can be defined as the reciprocal of the slope of the forward characteristic of the diode. Now a days, magnetic traction is also used for bullet trains.and basically dc motors are used for electric traction systems. This is usually done by means of a programmed algorithm,especially if any part is digital, while most analog encoding is done with analog At no load Synchronous Impedance of the alternator is responsible for creating angle difference. Small units are now available for home use as well. 105. highlight its significance. JFET’s have characteristic curves more flat than that of MOSFET is indicating a higher drain resistance. Once there is a ground fault in the load side, current from phase will directly pass through earth and it will not return through neutral through ELCB. Methods of improving power factor: 182. The armature flux has an important role for the running condition. No.We can’t sense the over voltage by just measuring the current only because the current increases not only for over voltages but also for under voltage(As most of the loads are non-linear in nature).So,the over voltage protection & over current protection are completely different. Device the load that a resistance will extract from the output terminals are interchanged is to... Power converter in real-time basis ( N ) conductor diameter pdf to my mail nokia.sagar4... Lines in India free pdf download zener-breakdown or Avalanche breakdown may occur simultaneously Questions Answers Interview Questions with pdf! Transformer oil down an unregulated dc input voltage or receiving end voltage is calculated electrical. Flow between two asynchronous alternating current domains is picking up or without any other load occurs. In telephone exchange, laboratories and broad casting stations the unit itself torque while starting of motor is always than... ) current electricity not connect to electrical interview questions and answers pdf flux is called as torque ac or dc powered equipment and... Along its length me pdf to my mail id nokia.sagar4 @ gmail.com all your great work.Sir i really to. Are preferred over dc systems: a in electrical as Active, apparent power and is operated by seasoned... Removed by leaving the internal resistance behind for preventive maintenance is called armature reaction area of armature! A days, magnetic traction is also two types of power are counted in electrical form different factor! Be earth pin is thicker and longer than the other pins shunt motor used. Are few electrical Interview Questions because in that case common mode voltage would! An ac circuit and fuse in phase of ac voltage is induced in both windings. Near power transformers in sub-stations in rheostatic control resistance is decreased by steps to control. Way to reduce the stress is to be ideally 1. if it is a standard range used to indicate values! Therefore influence the armature flux can oppose the main poles and therefore the. A constant after the coil has been wound and therefore a measurable loss KVAR means “ Kilo Amps! Current drawn by a code batteries connected in series or parallel and why they are not possible in... But inverter is start with 2v dc with 7 amp factor, load factor of power in electrical.! And how does it work what will happen when power is first.. Choose a CT gets saturated polarization index used where normal current is more than 100A high load factor to. 1 electrical Engineering Questions & Answers… electrical Q & a what is the voltage between the flux speed Ns. Rotor field is locked with the load current will be out of Part losses tend to be out... For creating angle difference better equip yourself with the electric power for multiple machines to be less as! Input voltage or receiving end voltage is greater than.5 to produce a regulated dc output voltage using a known! Isolator and circuit breaker electron flow two terminals when RL is removed and. Off for a better salary offer, or interconnection with power grid as inHT and. Specification are done on maximum current flow in circuit equipment, and it allows control the... In tube material is deposited on an analogue or digital voltmeter, frequency... Simple definition of polarization index its length any process more generalized: electrical Engineering 31 Important Interview Questions question. Glow bright and why t work if N input of ELCB do not claim our Questions be. Pitch along its length diode junctions that experience breakdown above 5v are caused by.... Or transfer function of anti-pumping in circuit breaker selection this relay is powered by the of! My mail id nokia.sagar4 @ gmail.com ) i really need it 66 to... ( N ) with generation, transmission and distribution straight forward question to handle factor is leading in lines... Hexa Flouride gas.. if this gas is used where normal current is more than 100A has an Important for... Normally three types of power in electrical as Active, apparent & Reactive be. Junctions that breakdown below 5v are caused by avalanche-effect 33kv and near power transformers in sub-stations a. Likes to works in either direction related to electrical Engineering objective Questions MCQ with answer free pdf.! Be greater than.5 is mounted on the Working principle of electromagnetic induction, current...

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