[DOWNLOAD] Basic Electrical Exam Questions And Answers
Which of the following bulbs will have the least resistance? A three phase alternator has a phase sequence of RYB for its three output voltages. Two-alternators are running in parallel. When two alternators are running in parallel, their RKVA load...
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20 Electrical Engineering Interview Questions & Answers
A synchronous motor working on leading power factor and not driving any mechanical, is known Synchronous Motor Questions and Answers 2. Which motor can conveniently operate on lagging as well as leading power factor? Synchronous Motor Questions and Answers 3. The back emf in the stator of a synchronous motor depends on Synchronous Motor Questions and Answers 4. Which of the following motors is non-self starling? Synchronous Motor Questions and Answers 5. In case of a synchronous motor we have I. Load II. Speed III.
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The capacitance of a small single phase motor will be of the order of Single Phase Motor Questions and Answers 2. In case of split phase motors the phase shift is usually limited to Single Phase Motor Questions and Answers 3. For ceiling fans generally the single phase motor used is Single Phase Motor Questions and Answers 4. In portable tools the speed of the driven shaft is reduced by Single Phase Motor Questions and Answers 5.
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Which of the following applications make use of a universal motor? Electric Power Generation Questions and Answers 1. Most of the generators in thermal power plants run at Electric Power Generation Questions and Answers 3. Which of the following is not the voltage at which power is usually transmitted Electric Power Generation Questions and Answers 4. Overall thermal efficiency of a steam power station is in the range Electric Power Generation Questions and Answers 5.
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What is the maximum size of steam turbine usually being installed, for thermal power plants? Power Generation Economics Questions and Answers 1. In an interconnected system consisting of a nuclear power stations, steam station and diesel generating station, which plant can be used as base load plant? Power Generation Economics Questions and Answers 4. In a power plant a reserve generating capacity which is in operation but not in services known as Electric Transmission and Distribution Questions and Answers 1. The inductance of a single phase two wire line is given by D is the distance between conductors and 2v is the diameter of conductor Electric Transmission and Distribution Questions and Answers 2.
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Between two supports, due to sag the conductor takes the form of Electric Transmission and Distribution Questions and Answers 3. Presence of ozone as a result of corona is harmful because Electric Transmission and Distribution Questions and Answers 4. The current drawn by the line due to corona losses is Electric Transmission and Distribution Questions and Answers 5. Which bulb operates on lowest power? Which gas is sometimes used in filament lamps? A schedule speed of 45 km, per hour is required between two stops 1. The duration of stop is 20 seconds. The acceleration is 2. Which of the following can be worked with higher flux densities? A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles.
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Why we use 3-phase supply? Why are not 4 or something else? Answer: 3 phase power generating and delivering is more efficient than 2 phase which in turn is more efficient than 1 phase. Similarly, going up in the number of phases result in increased efficiency as well, i. The increase of efficiency as the number of phases increase is attributed to that power delivery becomes more continuous as the number of phases increases and It affects the Installation cost of transmission of Transmission towers.
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Why is the starting current high in a DC motor? At starting, Eb is zero. What are the advantages of star-delta starter with induction motor? Answer: The main advantage of using the star delta starter is the reduction of current during the starting of the motor. Starting current is reduced to times Of current of Direct online starting. Hence the starting current is reduced; the voltage drops during the starting of the motor in systems are reduced. Answer: For lighting loads, neutral conductor is must and hence the secondary must be star winding. And this lighting load is always unbalanced in all three phases. To minimize the current unbalance in the primary we use delta winding in the primary. Why can series motor not be started on no-load? Answer: Series motor cannot be started without load because of high starting torque.
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Series motor is used in Trains, Crane etc. What is 2 phase motor? Answer: A two-phase motor is a motor with the starting winding and the running winding have a phase split. This type of generators is used in windmills. It is important part in Synchronous Generators, it controls the output voltage of generator by controlling its excitation current. Thus it can control the output Reactive Power of the Generator. Why the capacitors work on ac only? Answer: Generally, capacitor gives infinite resistance to dc components i. What is the function of anti-pumping in circuit breaker?
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Answer: When the breaker is closed at one time by close push button, the anti-pumping contactor prevents reclose the breaker by close push button after already close. Define IDMT relay? Answer: It is an inverse definite minimum time relay. In IDMT relay its operating is inversely proportional and also a characteristic of minimum time after which this relay operates. It is inverse in the sense, the tripping time will decrease as the magnitude of fault current increase. What is SF6 Circuit Breaker? Answer: when the breaker is close at one time by close push button he anti-pumping contactor prevent reclose the breaker by close push button after if it already close.
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How many types of cooling system it transformers? What is frantic effect? Answer: The output voltage is greater than the input voltage or receiving end voltage is greater than the sending end voltage. What are HRC fuses and where it is used? What is electrical diversity factor in electrical installations? Answer: Electrical diversity factor is the ratio of the sum of the individual maximum demands of the various subdivisions of a system, or part of the system, to the maximum demand of the whole system, or part of the system, under consideration.
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Electrical diversity factor is usually more than one. What is the difference between delta-delta, delta-star transformer? Delta-star is a distribution kind of transformer where from secondary star neutral is taken as a return path and this configuration is used for Step down voltage phenomena. Why are transformer ratings in kva? Answer: Since the power factor of the transformer is dependent on load we only define VA rating and does not include power factor. In case of motors, power factor depends on construction and hence the rating of motors is in K Watts and include power factor.
Basic Electrical & Electronics Interview Questions & Answers
Table of Contents Introduction Looks like you have your interview scheduled sometime soon. It is always good to brush up on your subject matter skills for your electrical engineering interview questions. When you will open your books, you will get flashbacks of the trauma that you sustained during the four years of studying. Going through basic electrical engineering interview questions can be a tricky task. The book seems to be an endless bunch of topics that roots deep into the matter. However, a secret is when you go for an interview. The interviewer is not looking at your rote learning skills. On the contrary, they are assessing your ability to understand the basic concepts. In other words, one must focus on basic knowledge instead of mugging up the whole book. And that is exactly what I bring forth with this article. Here, I try to present the top 20 basic electrical engineering interview questions that companies go for.
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These questions will help you in revising the concepts. It will therefore, prepare you for your interview. What part of an atom is a valance? The outermost shell of the atom is the valence. Define the concepts of inductance and capacitance. Capacitor helps in the storage of the capacitance at the measured voltage. Inductance is the resistance of the coil generated by a change in the current. When a second coil opposes the effect of the charge in the first coil, it leads to mutual inductance. What is the effect of placing two positively charged materials placed next to each other? As positives repel and opposites attract.
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Therefore, if two positively charged materials are placed next to each other, then the two materials will repel. And move away from each other. Mention the three different types of cables used in transmissions. Different types of cables that are used in transmission: Low Tension upto volts High Tension upto volts Super Tension upto kv These wires can categorized on the basis of their voltage and thermal capacity. Define reverse polarity and the process of fixing it. Reverse polarity occurs when the wires are incorrectly placed. The simple process to fix this problem is to check the connection of the wire from the outlet. One can also check the receptacle.
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Reverse polarity is when the white wire connects to the hot side. And the black wire connects to neutral side. Swapping this entanglement will solve reverse polarity. Describe the function of the different coloured wires. The different types of colours of wires signal the different functions they undertake. Primarily, there are 7 types of colour which have their own coding: Black: The black wire is the main source of power supply in the circuit. Not used for ground wires, these black wires are either in the hot state or live state.
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Green: This wire connects to the ground terminal. An outlet box contains green wires and it can only be spread within a panel electrical. Red: Red wire is the second wire, It transmits the live state of the wire. It can be used in different types of interconnections and are present in a circuit of volts. Moreover it can either be connect to another red wire, or to a black wire. It helps in carrying out the unbalanced load to the terminal. The terminal is located in the ground. The wire can connect itself to its own types of wires. One can easily find these wires in devices like fans, lights, etc. Differentiate between a generator and alternator.
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Both mechanisms work on the same basic principle of converting mechanical energy into electrical engineering. We can differentiate them as follows- Alternator: An alternator uses a rotating stationary armature, which is magnetic. It releases higher voltage. Whereas a stationary magnetic field with an armature that is rotating is used for releasing lower voltage. Generator: A generator, on the other hand, uses a revolving conductor rolling onto armatures using brushes and rings. What are the different criteria you will keep in mind while selecting a type of wire? Wires selection is based on a number of factors such as wire capacity, gauge of the different wires. If a person uses larger and heavier products, like those of electrical heaters or furnaces, I will be choosing a smaller gauge of wire. Gauge 6 wire may solve the purpose. It has a higher capacity to carry and handle the current. On the other hand, if I have to choose wires for household objects like lamps and lights, which require a low voltage, I will go for wires with higher gauge values, maybe around What is the RLC current?
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The word RLC is a combination of the three elements of the circuit. The circuit is also known as a second-order circuit. As it has the ability to provide direct current that is flowing throughout the circuit. And the ability of it to be characterised by a differential equation of the second order. What are semiconductors? Semiconductors are a combination of properties that belong to both an electrical conductor, such as copper, and an insulator, like sand.
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There are different types of semiconductors, which are intrinsic and extrinsic semiconductors. Extrinsic semiconductors have a further classification into n-type extrinsic semiconductors and p-type extrinsic semiconductors. Define a Zener diode. A Zener diode is a semiconducting diode, it helps current to flow into the opposite direction. Moreover it uses the desired amount of voltage. What is a laser diode? They are a type of compact transistor having more than 2, or even 2, electrical leads.
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When emission results in amplified photons, given that the photons in question are confined into the lasing mode. Then the process is said to be lasing. As the photon hits the mirrors inside the laser diode, they give out a beam that diverges from the packages of the laser diode. Define rectifiers and give its different types. A rectifier is an electrical device.
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It helps to convert alternating current into direct current. The current inside a rectifier flows in a single direction. The different rectifiers are: Half-wave: a type of rectifier that has only a single pn junction Full wave: a type of rectifier that has two pn junctions Q Inside an NPN current, there are two rules that state the flow of current: If there is no current flowing from A to D, it means there will be no current flowing from X to Z.
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If there is currently flowing from A to D, it means there will be current that is allowed to flow from X to Z. On the other hand, in a PNP transistor, there are 2 rules too, however, they are opposite of those used in the NPN transistors, that means: When there is currently flowing from A to D, there is no current that is flowing from X to Z Current flows from X to Z when there is no current flow from A to D. What is a transistor? A transistor is a semiconducting device that helps in interpreting electrical signals and powers. It is made up of semiconducting material. It should be connected to at least three terminals through an external circuit. A transistor is also known as combinations of many n-type and p-type semiconductors. Why do we use a transistor? The job of a transistor is to increase the input current. However, it will increase the output. In other words, electric and electrical power increases with the help of transistors. When we half the resistance, What will be the outcome in a circuit?
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The total current will be double of its original state. What will happen in a circuit if the total current in the system is doubled? Doubling of circuit will result in half resistance. What will be the outcome of voltage in a circuit if the string of resistors is placed in a series? In a series setup, the resistors will be equally dividing the proportion of voltage into their respective values. Differentiate between an analogue and a digital circuit? Within an analogue circuit, there is no conversion of the signal that received at the input before the transmission.
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