TasDia Network
TasDia Network

MCQs 1: Necessity of earthing is to

Protect the human being from shock Maintain the line voltage Protect tall building All of these
Answer Explanation

MCQs 2: The most effective earth plate is

Copper plates Cast - iron plates Galvanized iron plates All of these
Answer Explanation

MCQs 3: Three - phase induction motor is more suitable than single - phase because

It is self starting Better efficiency compared to single - phase Better power factor compared to single - phase All of these
Answer Explanation

MCQs 4: Commutator motors have

Absolutely uniform torque Approximately uniform torque Non - uniform torque None of these
Answer Explanation

MCQs 5: When windings of 3 - phase induction motor is rotated in a magnetic field, then the emf induced in each phase are of

Same magnitude but different frequency Different magnitude but same frequency Same magnitude and same frequency Different magnitude and different frequency
Answer Explanation

MCQs 6: In a 3 - phase star connected balanced induction motor, the line voltage is equal to the

3 times the phase voltage √3 times the phase voltage 1/√3 times the phase voltage 1/3 times the phase voltage
Answer Explanation

MCQs 7: In a star connected system, the current flowing through the line is

Greater than the phase current Equal to the phase current Lesser than the phase current None of these
Answer Explanation

MCQs 8: In case of a synchronous generator, armature winding and field winding are

Both stationary Stationary, rotating Rotating, stationary Both rotating
Answer Explanation

MCQs 9: Salient pole type motors have

Large diameter and large axial length Small diameter and small axial length Large diameter and small axial length Small diameter and large axial length
Answer Explanation

MCQs 10: Short pitched windings are mainly used because it

Gives better waveform of the generated emf Eddy current and hysteresis losses are reduced Less copper is used All of these
Answer Explanation

MCQs 11: The number of conductors in synchronous generators is equal to

The number of turns per phase Twice the number of coils per phase Half of the number of coils per phase None of these
Answer Explanation

MCQs 12: The steel used for laminations should have

High permeability and high hysteresis High permeability and low hysteresis Low permeability and hysteresis Low permeability and high hysteresis
Answer Explanation

MCQs 13: In core type transformer, the coils are wound in helical layers, each layers being insulated from each other by using

Paper Cloth Cooling ducts All of these
Answer Explanation

MCQs 14: In transformer if the secondary is open circuited then its terminal voltage is

Same as the induced emf Greater than the induced emf Lesser than the induced emf None of these
Answer Explanation

MCQs 15: For induction motors,

Should be essentially a constant speed motor Its speed reduces to some extent with increase in load Does not need to be synchronized All of these
Answer Explanation

MCQs 16: In induction motor, greater the number of poles

Lesser the speed Greater the speed Lesser the frequency All of these
Answer Explanation

MCQs 17: The advantage of skewing in induction motor is / are

Motor runs smoothly as the magnetic hum is reduced The tendency of the rotor teeth to remain under the stator teeth due to direct magnetic attraction is reduced More uniform torque is obtained while running All of these
Answer Explanation

MCQs 18: Slip ring induction motor are employed only for

Speed control High starting torque Both (a) and (b) None of these
Answer Explanation

MCQs 19: The resultant flux in an induction motor is equal to the

Maximum value of flux due to any phase Twice of the maximum value of flux due to any phase 0.5 times the maximum value of flux due to any phase 1.5 times the maximum value of flux due to any phase
Answer Explanation

MCQs 20: Electrical energy can be converted into

Light energy Electromagnetic energy Electrochemical energy All of these
Answer Explanation

Related Topics

About Us | Contact Us | Privacy Policy
ABOUT US
Category
Who We Are

TasDia Network, this platform not only provides you the best educational stuff but besides this, we are creating thousands of new ideas to making your signature and planning much more on a single platform.

© 2020-2023, TasDia Network

All rights of the publication are reserved by tasdia.com.