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Electrical Engineering Interview Question and Answer PDF
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Top 15 Electrical Engineering Interview Question and Answer PDF
1. State the advantages of speed control using thyristor?
Ans:
1. Features involving rapid switching than Mosfet, BJT etc.
2. Low price
3. Esteemed accuracy attained
2. Define ACSR cable and where we use it?
Ans: ACSR stands for- Aluminium Conductor Steel Reenforced which is utilised in transmission and distribution.
3. Enumerate the different kind of cables used for transmission?
Ans: Cables, which are used for transmitting power, can be categorized in three forms:
• Low-tension cables, .
• High-tension cables
• Super tension cables
4. The value of Back emf is used for DC motor
Ans: The value of back emf is zero.
5. State the benefits of VSCF wind electrical system?
Ans: Benefits of VSCF wind electrical system are:
• Simple pitch changing mechanism is needed.
• Aero turbine only operates at maximum efficiency point.
• Additional energy in the high wind speed region of the speed – duration curve is extracted
• The small reduction in aerodynamic stresses.
6.Why do you need to choose Electrical Engineering Ohm’s Law?
Ans: In this section, you can learn and practice Electrical
Engineering Questions based on "Ohm's Law" and improve your skills in order to face the interview.
8. Discuss RLC circuit?
Ans: An RLC circuit transfers an electrical circuit consisting of a resistor (R) and inductor (L) and a capacitor (C), connected in parallel or series. This typical circuit is termed as a second order circuit as any voltage or current flowing in the circuit can be described by a second-order differential equation.
9. Explain the term Capacitance and Inductance?
Ans: Capacitance: It is the amount of charge stored in side a the capacitor at a certain voltage.
Inductance: It is termed as the property of a coil to resist any changes in electric current passing through it. Mutual inductance occurs when a secondary coil resists current change in the primary coil.
10. What takes place when two positively charged material is placed together?
Ans: It is when two positively charged material place together it will repel.
11.Explain electron in the outer orbit?
Ans: Electron in the outer orbit is called valence.
12.Define System?
Ans: When a number of elements or components are interconnected in a sequence to perform a certain function, the
group of elements that all constitute a System.
13. Explain Control System?
Ans: Control System is a set of mechanical or electrical device and it is computerized.It manages,commands,directs or regulates the behaviour of other devices or systems using control loops.It can range from a single home heating controller using a thermostat controlling a domestic boiler.
14. State the different types of Control Systems?
Ans: Two major types of Control Systems are 1) Open loop Control System 2) Closed Loop Control Systems
Open loop Control Systems:The Open loop Control System is one in which the Output Quantity has no effect on the Input Quantity. No feedback is present from the output quantity to the input quantity for correction.
Closed Loop Control System:The Closed loop Control System is one in which the feedback is provided from the Output quantity to the input quantity for the correction so as to maintain the desired output of the system.
15. Define the term Latching current?
Ans: Gate signal is to be applied to the thyristor to trigger the thyristor ON in safe mode in no longer require to keep the scr in ON position.
16.Discuss reverse power relay?
Ans: It is used in installations where generator runs in parallel with the utility or another generator, directional power relay to monitor power from a generator running parallely with another generator or utility.The main function is to prevent reverse power condition when power flows from bus bar into the generator.
Job Interview Questions for Electrical Engineer pdf Download
Q) In the following options, what is the power of the S.I Unit?
A) Watt
Q) How many ohms, Human body resistance is about?
A) 1000 ohms
Q) What is the alternating current of the graph is?
A) Sine wave
Q) Through which equation we can measure the alternating voltage?
A) Vo sinwt
Q) What is the procedure of A.C to converts into D.C is known as?
A) Rectification.
Q) Through which components, unidirectional current passes?
A) Diode
Q) How the alternating current is induced in the transformer?
A) Secondary coil
Q) What is the transformer? when the output of the voltage is greater than the voltage input?
A) step up
Q) In a transformer, the voltage ratio is equal to the ratio of?
A) Total no of turns in the coil
Q) What is the biggest point on the AC graph?
A) Peak value
Q) What is the total resistance for four 10 Ohm resistance are connected in series?
A) 10 Ohm
Q) What is the total resistance for 60 Ohm resistance which is connected in parallel?
A) 20 Ohm
Q) What is the net capacitance, for four 10 uF capacitors which is connected in parallel?
A) 40 uF
Q) The effective capacitance for 60 uF capacitance is connected in series? what will be the capacitance?
A) 20 uF
Q) What is the emf for three phase system?
A) 120 degrees apart
Q) The purely resistive circuit for P.F is?
A) Unity
Q) What is the electrolytic capacitance?
A) D.C Only
Q) Which belongs to the single phase induction motor in the following?
i) fixed speed operation
ii) self starting
iii) Lesser reliable than synchronous motor of a three phase
iv) Not all the above
A) iv) Not all the above
Q) What is the D.C circuit power factor?
A) Unity
Q) In India, the domestic power supply frequency is?
A) 50 Hz
Q) The alternating current of frequency is:
A) In one second, the number of waves travels through a point.
Q) What is the statement is related to the highly capacitive circuit?
A) The reactive power is high than the actual power.
Q) Which statement is suitable for pure capacitive circuit?
A) By 90 degrees of voltage the current leads.
Q) Which statement is related to the pure resistive circuit?
A) The phase of the current within the voltage.
Q) What is the circuit unity of the power factor is:
A) The power factory of circuit unity is Resistance.
Q) The inductive circuit of power factor which is improved by connecting the capacitor to it?
A) In Parallel mode the inductive circuit of power factor connects to capacitor.
Q) What is the electric bulb power factor?
A) The electric bulb power factor is Unity
Q) The factor of active power ratio to apparent power is called as:
A) Power
Q) The unity of the power factor is:
A) The power factor unity is Resistance.
Q) The dielectric material must be:
A) Insulator
Q) What if the resistance of conductor raises:
A) Length will increase.
Q) The KVL defines:
A) The closed mesh is zero, when the sum of the emf and voltage drops.
Q) Define Ideal Transformer?
A) An ideal transformer is refer as imaginary transformer which any losses occurs to it. The transformer input power is same as output power of transformer. Ideal transformer has 100 % efficiency. Some losses in real transformer, it refers as theoretical transformer. i.e; P in = P out.
Q) What are the types of transformer and their losses?
A) Following are the types and losses of transformer:
Copper Losses: It is also referring as winding resistance. The main reason behind copper losses is because of the current travels through windings which causes conductors heating resistive.
Iron losses: iron losses are also known as core losses. It has two types such as Hysteresis Losses and Eddy current losses.
Hysteresis Losses: The reason for losses is because of reverse magnetic field. The core requires some energy which is called as hysteresis loss.
Eddy Current Losses: The losses of eddy current is because of the current which is raises inner side of the core. The resistive heating of the core cuases due to the eddy current.
There are many other transformer losses such as dielectric loss, stray loss, Mechanical losses and Magnetostriction loss.
Q: Define transformer voltage regulation and how it is essential?
The transformer voltage regulation is the percentage change within the secondary voltage from empty load to full load condition. Similarly , the secondary voltage consists the same all over the load, where the voltage regulation is zero. But it variates within the power factor of the load.
The value of the voltage regulation provides the transformers efficiency and it is good to have a transformer with low voltage regulation.
Q: Why should current transformers secondary will not be opened while there is a current flow in primary?
The current transformer is a important step up transformer which increases the voltage and decreases the current at the secondary side. From the open secondary condition, the primary current will become as the magnetizing current as it produces very high amount of secondary voltage that will damage the insulation which leads to personnel.
Q: How is capacitive inductive or purely resistive?
The total circuit impedance will be used to recognize the circuit. If its imaginary part impedance is positive, it is an inductive circuit. And if its imaginary part is negative then it is a capacitive circuit. It will be zero when the circuit is simply resistive.
Q: Define unilateral and bilateral circuit?
Unilateral is a circuit which has the properties change within the current flow direction or the voltage. Bilateral circuit properties will not change with current direction change or voltage supply.
Q: Describe linear and non-linear circuit?
The relation between the voltage and current will be linear which is directly proportional. The circuit parameter like resistance, inductance, frequency, capacity etc will remains constant with current and voltage differ.
Where in non linear circuit, the relation between current and voltage do not have a linear relationship. The electrical parameters like circuit varies with changing voltage and current.
Electrical Engineering Interview Question and Answer PDF For Freshers
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