What are three ways you can increase the strength of an electromagnet?

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asked Mar 14, 2018 by anonymous

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asked Mar 14, 2018 by anonymous

What happens when you reverse the direction of the current in an electromagnet?

Last answer: When you reverse current direction in an electromagnet, the magnetic poles will also change.

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asked Mar 14, 2018 by anonymous

What makes an electromagnet stronger than a solenoid?

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Last answer: Permanent magnet: A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. As the name suggests, a permanent magnet is 'permanent'. ... an electric current passes through the coil. If the current is interrupted, the magnetism is lost.

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asked Mar 15, 2018 by anonymous

What will happen if you increase the current in the motor?

Last answer: Increasing current means increasing frequency of the motor because current is directly proportional to rotations of the motor rotor

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asked Sep 4, 2018 by anonymous

What is dielectric strength of an insulating material? What is its unit?

Last answer: Dielectric Strength: The dielectric strength of an insulating material is the maximum voltage which the insulating medium can withstand without breakdown. Unit is volts per millimeter (V/mm), or kV/mm or kV/cm

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asked Sep 4, 2018 by anonymous

State any two applications of electromagnet.

Last answer: Applications of Electromagnet: Cranes, Motors, Generators, Transformers, Electromagnetic Relays, Circuit breakers, Traction, Measuring instruments, Electrical Bell etc.

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asked Mar 14, 2018 by anonymous

How can we increase the induced current?

Last answer: Induced current can be increased by reducing no of windings on the secondary part compared to primary.

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asked Mar 10, 2018 by anonymous

What is dielectric breakdown strength?

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asked Mar 19, 2018 by anonymous

Reduction in core losses and increase in permeability are obtained with transformer employing?

Last answer: Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

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asked Apr 28, 2018 by anonymous

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%

Last answer: When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is 73.2%

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asked Aug 8, 2018 by anonymous

Give the relation between magnetic field strength, magnetic flux density and permeability.

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asked Sep 4, 2018 by anonymous

Define : (i) Dielectric strength (ii) Breakdown voltage

Last answer: (i) Dielectric strength: The voltage which a dielectric material can withstand without breaking down (without losing its dielectric property) is called its dielectric strength. It is represented by kV/mm ... or is no longer an insulator) for a specified thickness, is its breakdown voltage.

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37 views 1 answer

asked Aug 8, 2018 by anonymous

Define magnetic field strength and state its unit.

Last answer: Magnetic field strength is the force experienced by a unit N-pole when placed at any point in a magnetic field is known as magnetic field strength or magnetizing force. Magnetising force or magnetic field ... unit of length is metre. So the unit of magnetic field strength is ampere turns per metre.

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asked Mar 30, 2020 by anonymous

A magnetic circuit has effective iron length of 100 cm and it is wound with 800 turns of wire carries 1 A. Find the magnetic field strength.

Last answer: magnetic field strength

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asked May 8, 2018 by anonymous

The electric breakdown strength of insulating materials depends on

The electric breakdown strength of insulating materials depends on (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these

Last answer: The electric breakdown strength of insulating materials depends on (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these

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asked Mar 19, 2018 by anonymous

The dielectric strength of transformer oil is expected to be?

Last answer: The dielectric strength of transformer oil is expected to be 33 kV.

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asked Apr 16, 2020 by anonymous

Define Dielectric Strength for transformer oil. State its value for new transformer oil.

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asked Mar 20, 2018 by anonymous

The size of a synchronous motor decreases with the increase in?

Last answer: The size of a synchronous motor decreases with the increase in flux density.

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asked Mar 19, 2018 by anonymous

For given applied voltage, with the increase in frequency of the applied voltage?

Last answer: For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.

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asked Oct 4, 2017 by anonymous

how can we reverse the direction of rotation of three phase induction motor?

how can we reverse the direction of rotation of three phase induction motor ?

Last answer: The direction of rotation of three phase induction motor can be reversed by plugging i.e by changing any two out of three phases of the supply to the stator of the Induction motor terminal.

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asked Mar 10, 2018 by anonymous

Why does increase in current mean a decrease in voltage?

Last answer: This is because current flows from high potential to low potential to bring the two diffrent potential to unity , thus a reduced potential (voltage)

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asked Jun 29, 2019 by anonymous

List three important characteristics of an electric circuit.

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asked Apr 29, 2018 by anonymous

When three resistors with unequal values are connected in parallel, _______

When three resistors with unequal values are connected in parallel, _______ A) The current across the resistors is the same B) The voltage drop across the resistors is the same C) The voltage drops across the resistors is proportional to the resistance of each resistor D) None of these

Last answer: When three resistors with unequal values are connected in parallel, The voltage drop across the resistors is the same

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asked Apr 29, 2018 by anonymous

Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch

Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

Last answer: Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

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asked Mar 20, 2018 by anonymous

Three point starter can be used for?

Last answer: Three point starter can be used for both shunt and compound motor.

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asked Nov 30, 2017 by anonymous

what is the difference between four point starter and three point starter?

Last answer: The only difference is in the NO VOLT COIL connection in the starter, in three point starter NVC is connected to the field whereas in four point starter it is connected separately. The advantage of using ... (for above rated speed) and lead to DEENERGISE the NVC leading to turning off of the motor.

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asked Mar 3, 2018 by anonymous

What is mean by plugging in three phase induction motor?

Last answer: Plugging in three-phase induction motor means interchanging of any two phases of a stator for quick stopping.

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asked Dec 22, 2017 by anonymous

What is a three phase connection?

Last answer: RYB, 440 volt/phase

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asked Jul 30, 2019 by anonymous

State any four advantages of three phase induction motor.

Last answer: Advantages of three phase induction motor https://youtu.be/27OIOCKN05U

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asked Sep 2, 2019 by anonymous

Why is a capacitor used in a single phase motor and not in three phase motor ?

Last answer: In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.

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128 views 6 answers

asked Aug 18, 2019 by anonymous

Why is a three phase denoted by R, Y, B ?

Last answer: phase 1 ,R =Red colour cable terminal, phase 2 Y=Yellow colour terminal cable,Phase 3 B=Blue colour cable terminal, N =Neutral. For identification.

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asked Sep 6, 2018 by anonymous

Define balanced and unbalanced load in three phase circuit.

Last answer: Balanced Load: When all the imedances of 3 phases are equal in magnitude and of same nature then load is said to be balanced. Unbalanced Load: When all the imedances of 3 phases are not equal in magnitude and of different nature then load is said to be unbalanced.

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asked Mar 25, 2018 by anonymous

In a three-phase supply floating neutral is undesirable because it way give rise to?

Last answer: In a three-phase supply floating neutral is undesirable because it way give rise to unequal line voltages across the load.

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asked May 3, 2020 by anonymous

Describe control of a single lamp from three places. Draw the relevant circuit diagram.

Last answer: Single lamp control from three places- It consists of two way switches & intermediate switch, the circuit diagram is as shown in figure. We require two 2-way switches and one intermediate switch and a lamp ... position of any one switch is changed, then the lamp will be turned off.

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asked Aug 11, 2018 by anonymous

Draw the waveform of three phase AC supply voltage.

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asked Apr 29, 2018 by anonymous

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

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

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172 views 1 answer

asked May 7, 2020 by anonymous

List different starting methods of three phase synchronous motor. Explain any one of them.

Last answer: Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor.

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66 views 1 answer

asked Aug 12, 2018 by anonymous

State any four application of three phase circuit.

State any four applications of three phase circuits.

Last answer: The application of three phase circuits are 1. Three phase circuit is used for power transmission over long distances. 2. Three phase circuit can produce rotating magnetic field 3. Three phase ... three phase Motors and Transformers. 4. Three phase circuit is used for power converters circuits.

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166 views 1 answer

asked Aug 11, 2018 by anonymous

State advantages of three phase over single phase.

Last answer: Advantages of 3-phase system over 1-phase system: - 1. More output: For the same size, output of poly-phase machines is always higher than single phase machines. 2. Smaller size: For ... are self- starting: The three phase ac motors are self starting, while single phase induction motor are not.

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2.8k views 4 answers

asked Apr 16, 2020 by anonymous

Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor

Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.

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asked Apr 16, 2020 by anonymous

Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.

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asked Mar 20, 2018 by anonymous

A three point starter is considered suitable for?

Last answer: A three point starter is considered suitable for shunt as well as compound motors.

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76 views 1 answer

asked Mar 18, 2018 by anonymous

Three phase synchronous motor will have how many sliprings?

Last answer: Three phase synchronous motor will have two sliprings.

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asked Mar 17, 2018 by anonymous

How is a three phase cage induction motor self starting?

Last answer: Any type of induction motor is self starting. Because the reason for torqe production require two flux displaced by some angle theta.If theta is constant with time then torqe will be constant;if ... torqe also pulsating. In induction motor this angle theta is not pulsating.so it is self starting

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asked Mar 11, 2018 by anonymous

Explain power relations in three phase circuit.

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asked Mar 8, 2018 by anonymous

Explain three phase half wave controller or three phase unidirectional controller.

Last answer: Three phase half wave controller or unidirectional controller:

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asked Mar 7, 2018 by anonymous

Explain Three Phase Bidirectional Delta Connected Controller.

Last answer: Three Phase Bidirectional Delta Connected Controller:

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asked Feb 19, 2018 by anonymous

Explain three phase bridge inverter.

Last answer: Three phase bridge inverter: Three phase bridge inverter converts DC voltage input to three-phase variable frequency variable voltage output. DC voltage source can be a DC source or output of the rectifier. ... in proper sequence. The switch may be thyristor or IGBT etc.

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asked Feb 14, 2018 by anonymous

Explain three phase full wave controller.

Last answer: Three phase full wave controller: Three phase full wave controller is also called as the three-phase bidirectional controller. Let the load is star connected so at each phase there are antiparallel connected SCRs. ... conduct at the same time and the third phase will be open.

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asked Nov 16, 2017 by anonymous

three phase to single phase cycloconverter

Last answer: three phase to single phase cycloconverter

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402 views 1 answer

What are three ways you can increase the strength of an electromagnet?

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