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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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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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The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.

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Description :

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

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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Description :

How can we reverse the direction of rotation of synchronous motor?

Answer :

By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.

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The direction of rotation of an hysteresis motor is determined by position of shaded pole with respect to main pole.

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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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In repulsion motor direction of rotation of motor is the same as that of brush shift.

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Description :

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

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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377 views 1 answer
Description :

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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94 views 1 answer
Description :

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

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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Description :

Answer :

The speed of a universal motor is usually reduced by using gearing.

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89 views 1 answer
Description :

Answer :

Speed control of a universal motor is achieved by varying field flux with tapped field windings, connecting rheostat in series, applying variable voltage by means of silicon controlled rectifier, applying variable voltage by means of variable auto-transformer.

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Description :

Answer :

The speed control of universal motor used for sewing machines is by varying the resistance.

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84 views 1 answer
Description :

Answer :

A universal motor is one which can be operated either on D.C. or A.C. supply at approximately the same speed and output.

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53 views 1 answer
Description :

Answer :

In a universal motor, the most common cause of brush sparking is open armature winding, shorted armature winding, shorted field winding, high commutator mica.

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115 views 1 answer
Description :

Answer :

The speed/load characteristics of a universal motor is same as that of D.C. series motor.

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96 views 1 answer
Description :

Answer :

A universal motor can run on either A.C. or D.C.

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52 views 1 answer
Description :

Answer :

The speed of a universal motor is generally reduced by using gear trains.

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80 views 1 answer
Description :

State working principle of universal motor with the help of diagram.

Answer :

Working Principle of Universal motor : It is modified DC series motor which can work on AC as well as DC supply. According to basic motor principle, whenever a current carrying conductor is placed in magnetic ... They have nearly same operating characteristic for both AC and DC supply. 

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78 views 1 answer
Description :

applications of each: i) Universal motor ii) Stepper motor.

Answer :

i) Applications of Universal motor: 1) portable drills 2) hair dryers 3) grinders 4) mixers 5) table-fans 6) blowers 7) polishers 8) Kitchen appliances  ii) Applications of Stepper motor ... 7) robotics 8) CNC machine 9) Control systems 10) Biomedical applications 10) XY recorder 11) plotters

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55 views 1 answer
Description :

State two applications of 1) Shaded pole motor 2) Universal motor

Answer :

(i)Applications of Shaded pole motor: 1. Small fans 2. Toy motors 3. Hair dryers 4. Ventilators 5. Electric clocks 6. Record players 7. Motorized valves 8. Gramophones 9. Photocopying ... 5. Portable Drilling Machines 6. Electric Shavers 7. Mechanical computing Machines 8. Machine Tools etc.

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104 views 1 answer
Description :

Draw and explain working of universal motor. Give two applications of universal motor.

Answer :

Figure of Universal motor:   Operation of universal motor on A.C. and D.C. supply:   *A universal motor works on either DC or single phase AC supply. When the universal motor is ... , regardless of AC or DC supply, universal motor works on the same principle that DC series motor works.  

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288 views 4 answers
Description :

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

Answer :

In a single-phase induction motor, the operating direction is determined by the Starting circuit

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84 views 1 answer
Description :

Direction of rotation of three phase induction motor can be reversed by   (a) interchanging connections of any two phases (b) disconnecting any one phase (c) (a) and (b) both (d) None of the above 

Answer :

The direction of rotation of 3-phase induction motor is reversed by Changing the phase sequence of supply.  OR  The direction of rotation of 3-phase induction motor is reversed by inter-changing any two phase connections of motor terminals with supply terminals.

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What is the direction of flow of current?

Answer :

Current  flows  from  anode  to  cathode(opposite  direction  to  flow of  electrons)

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What is the direction of the conventional current flow?

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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What is the direction of flow of electric current in an electric circuit?

Answer :

It  flows  from  anode  to  cathode  (direction  of   holes  flow)

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What is the direction of flow when charging a capacitor?

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What is the direction of the flow of electrons?

Answer :

Electrons  flow    cathode   to   anode  or  in   an  oposite  direction  of   convection  current  flow  or  holes.

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Answer :

In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 25% of the previous value.

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How does AC current change direction?

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

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

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What is the direction of an AC current?

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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What is the direction of the induced current?

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Description :

why current flows in opposite direction of electrons?

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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102 views 1 answer
Description :

The speed of a D.C. motor can be controlled by varying  1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

Answer :

The speed of a D.C. motor can be controlled by varying  1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

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159 views 1 answer
Description :

Answer :

The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.

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99 views 1 answer
Description :

Answer :

By looking at Commutator part of the motor, it can be easily confirmed that a particular motor is D.C. motor.

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96 views 1 answer
Description :

Answer :

The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.

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102 views 1 answer
Description :

Answer :

Yes DIAC can conduct in both direction.

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Description :

A universal RLC bridge uses?

Answer :

A universal RLC bridge uses Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance.

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265 views 1 answer
Description :

A d.c. motor can be looked upon as d.c. generator with the power flow?

Answer :

A d.c. motor can be looked upon as d.c. generator with the power flow reversed.

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3.1k views 1 answer
Description :

Answer :

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

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227 views 1 answer
Description :

Answer :

The current drawn by the armature of D.C. motor is directly proportional to the torque required.

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366 views 1 answer
Description :

The number of poles of 8/6 stepper motor can be :

Answer :

The number of poles of 8/6 stepper motor can be : 4

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203 views 1 answer
Description :

Answer :

if induction motor rotates exceed than its synchronous speed, it acts as a generator.

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55 views 1 answer
Description :

Answer :

Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.

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Description :

The phase sequence of a 3 phase alternator is RBY. If the direction of rotation of field is reversed, then which of the following can be the phase sequence ? (A) RBY (B) BYR (C) BRY (D) YRB

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Description :

Answer :

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be cumulatively compounded.

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Description :

Answer :

The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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