Last Answer : In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.
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338 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.
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357 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In repulsion motor direction of rotation of motor is the same as that of brush shift.
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116 views
1 answer
asked
Mar 20, 2018
by
anonymous

The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching
Last Answer : The direction of rotation of an inverter fed 3-phase ac motor is reversed by changing the sequence of switching
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153 views
1 answer
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Apr 28, 2018
by
anonymous

Last Answer : The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.
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184 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.
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247 views
1 answer
asked
Mar 20, 2018
by
anonymous

How can we reverse the direction of rotation of synchronous motor?
Last Answer : By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.
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305 views
1 answer
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Mar 18, 2018
by
anonymous

Last Answer : A hysteresis motor works on the principle of hysteresis loss.
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121 views
1 answer
asked
Mar 20, 2018
by
anonymous

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator
Last Answer : In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator
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599 views
1 answer
asked
May 1, 2018
by
anonymous
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Last Answer : To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.
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130 views
1 answer
asked
Mar 20, 2018
by
anonymous

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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137 views
1 answer
asked
Oct 4, 2017
by
anonymous
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Describe with neat sketch working of hysteresis motor.
Last Answer : Working: When stator is energized with single phase ac supply, rotating magnetic field is produced because of starting (auxiliary) and main windings, which remain in circuit permanently. The ... the principle of magnetic locking this motor either rotates at synchronous speed or not at all.
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203 views
1 answer
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May 7, 2020
by
anonymous

Last Answer : The rotor of a hysteresis motor is made of chrome steel.
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56 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a hysteresis motor, the rotor must have retentivity.
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72 views
1 answer
asked
Mar 20, 2018
by
anonymous

In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these
Last Answer : In a single-phase induction motor, the operating direction is determined by the Starting circuit
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127 views
1 answer
asked
Apr 29, 2018
by
anonymous

The efficiency of two identical transformers under load conditions can be determined by?
Last Answer : The efficiency of two identical transformers under load conditions can be determined by back-to-back test.
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322 views
1 answer
asked
Mar 19, 2018
by
anonymous

What is magnetic hysteresis? What is the cause of hysteresis?
Last Answer : Magnetic hysteresis: When a magnetic material is subjected to cycle of magnetization, it is found that flux density (B) in the material lags behind applied magnetizing force (H). This ... the movement of orientation, due to which the flux density lags behind the magnetic field intensity.
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77 views
1 answer
asked
Sep 4, 2018
by
anonymous
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State the factors affecting hysteresis loss.
Last Answer : i) Flux density ii) Frequency iii) Volume of the magnetic material iv) Nature of magnetic material
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86 views
1 answer
asked
Sep 4, 2018
by
anonymous
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Explain the hysteresis loop of a magnetic material with neat diagram.
Last Answer : Hysteresis loop of magnetic material: The circuit arrangement for plotting the hysteresis loop is shown in figure given below. The electromagnetic part consists of a coil wound on the iron ring ... one magnetic reversal is called hysteresis loop. Meaning of hysteresis is to lag behind.
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659 views
1 answer
asked
Aug 8, 2018
by
anonymous

Hysteresis is commonly found in ______ A) ferromagnetic materials B) ferroelectric materials C) both A and B D) none of these
Last Answer : Hysteresis is commonly found in ______ A) ferromagnetic materials B) ferroelectric materials C) both A and B D) none of these
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125 views
1 answer
asked
Apr 29, 2018
by
anonymous

The term hysteresis is associated with (A) On-Off control (B) P-I control (C) Feed forward control (D) Ratio control
Last Answer : The term hysteresis is associated with On-Off control
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74 views
1 answer
asked
Apr 26, 2018
by
anonymous

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be?
Last Answer : If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be large.
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623 views
1 answer
asked
Mar 25, 2018
by
anonymous
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In a magnetic material hysteresis loss takes place primarily due to?
Last Answer : In a magnetic material hysteresis loss takes place primarily due to it high retentivity.
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409 views
1 answer
asked
Mar 25, 2018
by
anonymous

Last Answer : As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for sound equipment.
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115 views
1 answer
asked
Mar 20, 2018
by
anonymous

What is the difference between eddy current and hysteresis loss?
Last Answer : Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses
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3.0k views
1 answer
asked
Mar 15, 2018
by
anonymous

Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.
Last Answer : Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:
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719 views
1 answer
asked
Feb 16, 2018
by
anonymous

Why: moons orbit rate = moons rotation rate?
Last Answer : answer:Google: lunar synchronous rotation Google: lunar libration Simple or complicated explanations available. We see glimpses of more than 50% of the lunar surface, due to its elliptical orbit and its slight tilt to the earth’s orbit around sun (ecliptic.)
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1 view
1 answer
asked
Feb 14
by
anonymous

The direction of rotation of hysteresis motor is determined by the: (A) Resistivity of the rotor material. (B) Amount of hysteresis loss. (C) Permeability of rotor material. (D) Position of shaded pole w.r.t main pole.
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145 views
0 answers
asked
Apr 5, 2018
by
anonymous

Two non-collinear parallel equal forces acting in opposite direction?
Last Answer : Two non-collinear parallel equal forces acting in opposite direction constitute a couple.
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455 views
1 answer
asked
Mar 22, 2018
by
anonymous

What is the direction of flow when charging a capacitor?
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74 views
0 answers
asked
Mar 15, 2018
by
anonymous

How does AC current change direction?
Last Answer : This is because the angle at which the magnetic fields cuts across a winding changes its poles thus current has to change dirention .
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92 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of the induced electric field?
Last Answer : It is in opposite direction to the one that produced it.
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78 views
1 answer
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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172 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of an AC current?
Last Answer : The magnitude and direction of alternating current is changes with respect to time. So for half cycle it is positive and for next half cycle it is negative.
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2.6k views
2 answers
asked
Mar 14, 2018
by
anonymous

What is the direction of the induced current?
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81 views
0 answers
asked
Mar 14, 2018
by
anonymous

What is the direction of the electric field?
Last Answer : Electric field is at right angle widh flow of current (right hand rule).
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127 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of flow of current?
Last Answer : Current flows from anode to cathode(opposite direction to flow of electrons)
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95 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of the flow of electrons?
Last Answer : Electrons flow cathode to anode or in an oposite direction of convection current flow or holes.
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110 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of the conventional current flow?
Last Answer : The conventional current flow in opposite direction of flow of electrons. The electrons flow from negative terminal of battery to positive terminal of battery. And conventional current flow from positive terminal of battery to negative terminal of battery.
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101 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of flow of electric current in an electric circuit?
Last Answer : It flows from anode to cathode (direction of holes flow)
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171 views
1 answer
asked
Mar 14, 2018
by
anonymous

why current flows in opposite direction of electrons?
Last Answer : Hi team, the current flow is nothing but flow of electrons But the conventional direction I'd opposite to actual current flow . ..
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116 views
1 answer
asked
Oct 3, 2017
by
anonymous
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Last Answer : Yes DIAC can conduct in both direction.
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69 views
1 answer
asked
Sep 20, 2017
by
anonymous

The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?
Last Answer : The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be 4.
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143 views
1 answer
asked
Mar 26, 2018
by
anonymous

Last Answer : When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.
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119 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The speed of a universal motor is generally reduced by using gear trains.
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96 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The wattage of motor for driving domestic sewing machine will be around 100 to 150 W.
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103 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The wattage rating for a ceiling fan motor will be in the range 50 to 150 W .
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177 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The repulsion-start induction-run motor is used because of high starting torque.
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89 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In A.C. series motor compensating winding is employed to reduce sparking at the brushes.
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145 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.
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162 views
1 answer
asked
Mar 20, 2018
by
anonymous
