Maximum Power Transfer Theorem

EEE Interview Questions IV

1. What is Power System? It is a branch of electrical engineering which deals with the study of generation, transmission, distribution and utilization of electrical energy 2. What is Power Factor? The cosine of angle between voltage and the current in an AC circuit is known as power factor 3. How should be power factor for the good working system? Power Factor should be less than 1 for the good working system 4. What is one line diagram? One line diagram is a single line representation of three phase power system It consists of symbol representation of bus bar, Generator, Alternator, e.t.c [caption id="attachment_91" align="alignnone" width="624"] one line diagram 5. W...

Basic MCQ's of EEE-I

1.What is the unit of electrical charge? 1.watt 2. joule 3. volt 4. coulomb Answer: 4 Explanation: unit of Charge -> Coulomb, Energy ->Joule, Voltage -> Volts, Power -> Watts 2 . The minimum resistance value for a blue, gray, red, silver resistor is 1. 612 2. 6,120 3. 6,800 4. 6,460 Answer: 2 Explanation: blue-6 grey-8 red-2 so value is 6800ohms tolerance +-10% therefore minimum resistance value is 6800/100*10=680 6800-680=6120 3 . If the current changes from 4A to 5A in 1s with the emf 10V. then what will be the value of inductance? 1.10H 2. 20H 3. 30H 4. 40H Answer: 1 Explanation: As emf=L(i2-i1)/t by substituting i2=4A, i1=5A, emf=10V,we get L=10H 4. What happens when many resistors are connected in series? 1. Divides the voltage proportionally 2. Divides the current propotionally 3. Increase the source voltage 4. Decrease the power to zero ...

Center Tapped Transformer

Center Tap: Center Tap is a point connected along the half way of transformer, inductor, resistor or potentiometer. It provides variable in the value. Center Tapped transformer: Mostly center tapped transformer are used to reduce low voltage supply. This happens when the demand is more than the supply voltage. If the transformer is overloaded then the output voltage reduces. This problem can be reduced by using Center tapped transformer where the number of turns can be changed by connecting at various point of windings. so the output voltage can be managed. Center tapped transfromer has the same working principle as normal transformer but the main difference is secondary winding is divided into two parts. Center tapped transformer Working Principle: The working principle is same as normal transformer. If the alternating current is made to pass through the primary winding the flux will be produced in it, when the secondary winding is brought near to it, an induced e...

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