Electrical Engineering Interview Questions

Electrical Engineering Interview Questions

Hello guys, welcome back to our blog Electrical Engineering. Here we today discuss about mostly asked Electrical Engineering Interview Questions.

In this article we list the basic question related to activate elements and passive elements. Here we mostly covered all the mcq's related to activate and passive elements. If any element is not considered in the question then you can list out it in comment section.

Basic Electrical Engineering Interview Questions Related to Activate Elements and Passive elements:

What is the Function Of Transformer?

A. Step Up Voltage

B. Step Down Voltage

C. A & B Both

D. None of these

Answer: C. A & B Both

(1) Resistance is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

• Answer: A. Passive Element

(2) Capacitor is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

• Answer: A. Passive Element

(3) Diode is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

• Answer: B. Active Element

(4) Transistor is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

• Answer: B. Active Element

(5) Thermistor is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

• Answer: B. Active Element

(6) Inductor is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

• Answer: A. Passive Element

(7) Battery is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

Answer: B. Active Element

(8) Transformer is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

• Answer: A. Passive Element

(9) LED is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

• Answer: B. Active Element

(10) Thermistor is which type of element?

A. Passive Element
B. Active Element
C. Active and Passive Both
D. None of the Above

• Answer: A. Passive Element

How to Check Connection is Star or Delta?

How to Check Connection is Star or Delta?

How to check connection is Star or Delta?

Here we explain that how to check connection is Star or Delta. Now we go for explanation.

To know the connection is Star or Delta, Firstly we know that the circuit Diagram of star connection and Delta connection.

Below we saw the circuit diagram of star connection and circuit Diagram Of Delta Connection.

Circuit Diagram Of Star Connection:

Circuit Diagram Of Star Connection

Circuit Diagram Of Delta Connection:

Circuit Diagram Of Delta Connection

So Now you can identify the connection Star or Delta by using circuit Diagram Of Star Connection and circuit Diagram Of Delta Connection.

Difference Between Star Connection and Delta connection:

So, Now we can see the difference between connection of Star and Delta. So, by using this comparison you can definitely identify the connection is Star or Delta.

• Star Connection is a 4 – wire connection and Delta Connection is a 3 – wire connection.
• Star Point is the Common point of the Star Connection And In Delta Connection There is no neutral. 
• In Star Connection Line Voltage and Phase Voltage is different. In Delta connection Line Voltage and Phase Voltage are same.
• Line Current and Phase Current are same in Star Connection. Line current is root three times the phase current in Delta connection.
• In Star Connection, IL = IP. Delta connection, IL = √3 IP.

Here In Below image we saw the difference between Star Connection and Delta connection

Difference between Star and Delta connection

So,I hope You understand all the difference and Circuit Diagram Of Star Connection and Circuit Diagram Of Delta Connection.

Star Or Delta??

Which Is This?? 

Magnetic Field | MCQs | Electrical Engineering Questions

Magnetic Field |  MCQs | Electrical Engineering Questions

We provide MCQ type Questions And Answers which is more helpful to clear fundamentals of electrical. Here , we provided Questions and Answers related to magnetic field.

Magnetic Field |  MCQs | Electrical Engineering Questions

All the MCQs are very helpful in competitive exams such that GATE, IELTS, etc. And also useful in interview and viva.

Questions related to magnetic field is provided below with suitable answers.

Question And Answer ( Magnetic Field)

Q.1

Magnetism steel is normal difficult

because

(a)it corrodes easily

(b)it has high permeability

(c)it has high specific gravity

(d)it has low permeability

Ans.

(d)it has low permeability

Q.2

The left hand rule correlates to

(a)current, induced e.m.f. and direc-

tion of force on a conductor

(b)magnetic field, electric field and

direction of force on a conductor

(c)self induction, mutual induction

and direction of force on a conductor

(d).current, magnetic field and direc-

tion of force on a conductor

Ans.

(d).current, magnetic field and direc-

tion of force on a conductor

Q.3 

The unit of relative permeability is

(a)henry/meter

(b)henry

(c)henry/sq. m

(d)it is dimensionless

Ans.

(d)it is dimensionless

Q.4.

A conductor of length L has current I

passing through it, when it is placed

parallel to a magnetic field. The force

experienced by the conductor will be

(a)zero

(b)BLI

(c)B2LI

(d)BLI

Ans.

(a)zero

Q.5

The force between two long parallel

conductors is inversely proportional to

(a)radius of conductors

(b)current in one conductor

(c)product of current in two conduc-

tors

(d)distance between the conductors

Ans.

(d)distance between the conductors

Q.6

Materials subjected to rapid reversal of

magnetism should have

(a)large area of B-H loop

(b)high permeability and low hysteresis

loss

(c)high co-reactivity and high reten-

tivity.

(d)high co-reactivity and low density

Ans.

(b)high permeability and low hysteresis

loss

 Q.7 

Indicate which of the following material

does not retain magnetism permanently.

(a)Soft iron

(b)Stainless steel

(c)Hardened steel

(d)None of the above

Ans.

(a)Soft iron

Q.8

The main constituent of perm alloy is

(a)cobalt

(b)chromium

(c)nickel

(d)tungsten

Ans.

(c)nickel

Q.9

The use of permanent magnets is not

made in

(a)magnetos

(b)energy meters

(c)transformers 

(d)loud-speakers

 Ans.

(c)transformers


Q.10

Paramagnetic materials have relative

permeability

(a)slightly less than unity

(b)equal to unity

(c)slightly more than unity

(d)equal to that ferromagnetic materials

Ans.

(c)slightly more than unity

Q.11

Degaussing is the process of

(a)removal of magnetic impurities

(b)removing gases from the materials

(c)remonetizing metallic parts

(d)demagnetizing metallic parts

Ans.

(d)demagnetizing metallic parts

Q.12

Substances which have permeability

less than the permeability of free space

are known as

(a)ferromagnetic 

(b)paramagnetic

(c)diamagnetic

(d)bipolar

Ans.

(c)diamagnetic

Q.13

Two infinitely long parallel conductors

in vacuum and separated 1 meter between centers when a current of 1

ampere flows through each conductor,

produce on each other a force of

(a)2x10-2N/m

(b)2x10~N/m

(c)2x 10-N/m 

(d)2x10-N/m

Ans.

(d)2x10-N/m

Q.14

In the left hand rule, forefinger always

represents

(a)voltage

(b)current

(c)magnetic field

(d)direction of force on the conductor

Ans.

(c)magnetic field

Q.15

Which of the following is a ferromag-

netic material?

(a)Tungsten

(b)Aluminum

(c)Copper

(d)Nickel

Ans.

(d)Nickel

Difference between core type Transformer and Shell type Transformer

Difference between core type Transformer and Shell type Transformer

There are the many difference between Core type Transformer and Shell type Transformer.

Difference between core type Transformer and Shell type Transformer

All the difference point is mention below and all the main difference are covered.


Difference Point 1

Core Type Transformer:

Core type transformer has considerable part of the core of a transformer which is surrounded by a coil

Shell Type Transformer:

Shell type transformer has a considerable part of the winding of the transformer which is surrounded by a core.


Difference Point 2

 Core Type Transformer:

There is only one magnetic circuit is used in the core type transformer.



Shell Type Transformer:

There are two magnetic circuit is used in the two type transformer.

 
Difference Point 3

 Core Type Transformer:

Cylindrical type winding is used in the core type transformer.

 Shell Type Transformer:

Sandwich type winding is used in the core type transformer. 


Difference Point 4

 Core Type Transformer:

L.V. winding and H.V. windings of the core type transformer are mounted on two opposite limbs of the core.

 Shell Type Transformer:

L.V. winding and H.V. windings of the shell type transformer are mounted on central limbs of the core.


Difference Point 5

 Core Type Transformer:

Core type transformer is more suitable for high voltage transformer.

 Shell Type Transformer:

 Shell type transformer is more suitable and economical for low voltage transformer.


Difference Point 6

 Core Type Transformer:

Core has two limbs in the core type transformer.

 Shell Type Transformer:

Core has three limbs in the shell type transformer.


Difference Point 7

 Core Type Transformer:

Maintenance is very easy in the core type transformer because coil can be easily removed.

 Shell Type Transformer:

Maintenance is very difficult in the core type transformer because coil can't  be easily removed because of coil is on the central limb.
 

Difference Point  8

 Core Type Transformer:

Shape of the core is either rectangular or circular in the core type transformer.

 Shell Type Transformer:

Shape of the core is either rectangular or cylindrical or spiral in the shell type transformer.


Difference Point  9
 
 Core Type Transformer:

Mean length of the coil is shorter in the core type transformer.

 Shell Type Transformer:

Mean length of the coil is longer in the shell type transformer. 


Difference Point 10

 Core Type Transformer:

Construction of the core type transformer is simple.

 Shell Type Transformer:

Construction of the core type transformer is difficult as compare to core type transformer.  



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Here Only Five Questions  !! If You Want More Questions Than Read More Post Which Given At Bottom Of Page For More Questions


1. In a single phase motor the centrifugal switch

(a) disconnects auxiliary winding of the motor

(b) disconnects main winding of the motor

(c) reconnects the main winding the motor

(d) reconnects the auxiliary winding of the motor

Ans: a



2. The running winding of a single phase motor on testing with mugger is found to be ground. Most probable location of the ground will be

(a) at the end connections

(b) at the end terminals

(c) anywhere on the winding inside a slot

(d) at the slot edge where coil enters or comes out of the slot

Ans: d





3. A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will

(a) start and then stop

(b) start and run slowly

(c) start and run at rated speed

(d) not start at all

Ans: d



4. Which of the following motors is used in mixes ?

(a) Repulsion motor

(b) Reluctance motor

(c) Hysteresis motor

(d) Universal motor

Ans: d

5. Which of the following motors is inherently self starting ?

(a) Split motor

(b) Shaded-pole motor

(c) Reluctance motor

(d) None of these

Ans: b

6. The direction of rotation of an hysteresis motor is determined by

(a) interchanging the supply leads

(b) position of shaded pole with respect to main pole

(c) retentively of the rotor material

(d) none of these

Ans: b

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Here Only Five Questions  !! If You Want More Questions Than Read More Post Which Given At Bottom Of Page For More Questions

1. In a shaded pole single-phase motor, the revolving field is produced by the use of

(a) inductor

(b) capacitor

(c) resistor

(d) shading coils

Ans: d



2. A centrifugal switch is used to diss- connected starting winding when motor has

(a) run for about 1 minute

(b) run for about 5 minutes

(c) picked up about 50 to 70 per cent of rated speed

(d) picked up about 10 to 25 per cent of rated speed

Ans: c






3. If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ?

(a) Universal motor

(b) Shaded pole type motor

(c) Capacitor start motor

(d) Capacitor start and run motor

Ans: a



4. The value of starting capacitor of a fractional horse power motor will be

(a) 100 uF

(6) 200 uF

(c) 300 uF

(d) 400 uF

Ans: c

5. In repulsion motor direction of rotation of motor

(a) is opposite to that of brush shift

(b) is the same as that of brush shift

(c) is independent of brush shift

Ans: b

6. Which of the following motors is used in mixes ?

(a) Repulsion motor

(b) Reluctance motor

(c) Hysteresis motor

(d) Universal motor

Ans: d

7. Which of the following motors is inherently self starting ?

(a) Split motor

(b) Shaded-pole motor

(c) Reluctance motor

(d) None of these

Ans: b

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1. In a split phase motor

(a) the starting winding is connected through a centrifugal switch

(b) the running winding is connected through a centrifugal switch

(c) both starting and running windings are connected through a centrifugal switch

(d) centrifugal switch is used to control supply voltage

Ans: a




2. The rotor developed by a single-phase motor at starting is

(a) more than i.he rated torque

(b) rated torque

(c) less than the rated torque

(d) zero

Ans: C







3. Which of the following motor will give relatively high starting torque ?

(a) Capacitor start motor

(b) Capacitor run motor

(c) Split phase motor

(d) Shaded pole motor

Ans: a

4. Which of the following motor will have relatively higher power factor ?

(a) Capacitor run motor

(b) Shaded pole motor

(c) Capacitor start motor

(d) Split phase motor

Ans: a




5. In a shaded pole motor, the shading coil usually consist of

(a) a single turn of heavy wire which is in parallel with running winding

(b) a single turn of heavy copper wire which is short-circuited and carries only induced current

(c) a multilayer fine gauge copper wire in parallel with running winding

(d) none of the above

Ans: b

6. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to

(a) improve power factor

(b) increase overload capacity

(c) reduce fluctuations in torque

(d) to improve torque

Ans: a

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1. In a split phase motor, the running winding should have

(a) high resistance and low inductance

(b) low resistance and high inductance

(c) high resistance as well as high inductance

(d) low resistance as well as low inductance

Ans: b



2. If the capacitor of a single-phase motor is short-circuited

(a) the motor will not start

(b) the motor will run

(c) the motor will run in reverse direction

(d) the motor will run in the same direction at reduced r.p.m.

Ans: a

3. In capacitor start single-phase motors

(a) current in the starting winding leads the voltage

(b) current in the starting winding lags the voltage

(c) current in the starting winding is in phase with voltage in running winding

(d) none of the above

Ans: a





4. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to

(a) improve power factor

(b) increase overload capacity

(c) reduce fluctuations in torque

(d) to improve torque

Ans: a





5. In a capacitor start motor, the phase displacement between starting and running winding can be nearly

(a) 10

(b) 30

(c) 60

(d) 90

Ans: d


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