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Define balanced supply and unbalanced supply.

Recent questions tagged induction

1 answer 29 views

State and explain any four factors governing selection of induction motor.

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
2 answers 35 views

Explain energy conservation technique “by improving power quality” for induction motor.

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 97 views

Split phase induction motor

asked Sep 20, 2018 in Electrical Machine by Zeeshan
1 answer 78 views

State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor 

asked Sep 18, 2018 in Industry Electrical Systems-I by Shimroz123
1 answer 10 views

State the function and shape of following parts used in induction type energy meter: i) Series magnet ii) Shunt magnet iii) Al disc iv) Brake magnet

asked Sep 6, 2018 by Shimroz123
1 answer 17 views

Draw a neat sketch of 1-ph induction type energy meter and write operating principle of it. 

asked Sep 6, 2018 by Shimroz123
1 answer 15 views

List any four errors in induction type energy meter. Give method of compensation for each.

asked Sep 5, 2018 by Shimroz123
0 answers 109 views

Explain the working of shaded pole induction motor.

asked Sep 1, 2018 by Quiz
1 answer 26 views

State Faraday's law of electromagnetic induction.

asked Aug 8, 2018 by Quiz
1 answer 253 views

Can you guys explain the advantages of frequency converter against the star delta or soft starter?

asked Jun 22, 2018 in Electrical Machine by Erdemuysal
1 answer 22 views

In a double squirrel cage induction motor, good starting torque is produced as (A) Large current flows through the outer high resistance winding. (B) Large current flows through the inner high resistance winding. (C) Small current flows through the outer high resistance winding. (D) Large current flows through the inner low resistance winding.

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 20 views

A change of 4% in the supply voltage to an induction motor will produce a change of approximately

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 39 views

The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be

asked May 3, 2018 in Electrical machine design by Shimroz123
1 answer 40 views

In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will  (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 38 views

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque  (1) Decreases (2) Increases (3) Remains constant (4) None of the above

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 15 views

The range of frequencies used in induction heating is :  (A) 0-25 Hz  (C) less than 200 Hz  (B) 50 to 100 Hz  (D) more than 1 kHz

asked Apr 29, 2018 in Utilization of electrical energy by Shimroz123
1 answer 21 views

Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 60 views

The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is 

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 32 views

A 400 V, 50 Hz three-phase induction motor rotates at 1440 rpm on full -load. The motor is wound for

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 20 views

In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

asked Apr 28, 2018 in Switchgear And Protection by Shimroz123
1 answer 19 views

In a split-phase induction motor, the resistance/reactance ratios of windings are such that (A) current in the auxiliary winding leads the current in the main winding (B) current in the auxiliary winding lags the current in the main winding (C) both windings develop the same starting torque (D) both windings develop high starting current

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then (A) the flux is constant (B) the flux first decreases and then increases in the same direction (C) the flux increases and decreases in the opposite direction with the same magnitude (D) current flows through the rotor

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 19 views

Slot harmonics are reduced in induction motors by using (A) fractional-pitch windings (B) fractional-slot windings (C) integral-slot windings (D) distributed windings

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 36 views

An induction type energy meter is found to run fast. Correction for this error can be made by  (A) Over-load compensation. (B) Voltage compensation. (C) Moving the brake magnet away from the centre of the disc. (D) Moving the brake magnet towards the centre of the disc.

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 19 views

Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as (A) One-third of their synchronous speed (B) One-fifth of their synchronous speed (C) One-seventh of their synchronous speed (D) One-ninth of their synchronous speed

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 32 views

A 3-phase, 4-pole, 50Hz induction motor runs at a speed of 1440 rpm. The rotating field produced by the rotor rotates at a speed of ________ rpm with respect to stator field. (A) 1500 (B) 0 (C) 1440 (D) 60

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 29 views

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is (A) 5.06 kW (B) 0.3 kW (C) 100 kW (D) 83.33 kW

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 115 views

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is (A) Full-load torque (B) unstable torque (C) starting torque (D) break down

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 21 views

In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an external resistance in the rotor circuit and the slip is 0.15. If the rotor winding resistance per phase is 0.2 Ω, the external resistance is (A) 0.2 Ω (B) 0.3 Ω (C) 0.4 Ω (D) 0.5 Ω

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 16 views

The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?

asked Mar 26, 2018 in Induction Machine by Shimroz123
1 answer 25 views

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?

asked Mar 20, 2018 in Induction Machine by Shimroz123
1 answer 27 views

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

asked Mar 20, 2018 in Synchronous machine by Shimroz123

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