Answer :
Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.
asked
Mar 20, 2018
by
anonymous
Answer :
The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.
asked
Mar 20, 2018
by
anonymous
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
asked
Apr 28, 2018
by
anonymous
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.
asked
Mar 18, 2018
by
anonymous
Answer :
The direction of rotation of an hysteresis motor is determined by position of shaded pole with respect to main pole.
asked
Mar 20, 2018
by
anonymous
Answer :
In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.
asked
Mar 20, 2018
by
anonymous
Answer :
In repulsion motor direction of rotation of motor is the same as that of brush shift.
asked
Mar 20, 2018
by
anonymous
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
asked
May 1, 2018
by
anonymous
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.
asked
Mar 20, 2018
by
anonymous
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.
asked
Oct 4, 2017
by
anonymous
Answer :
The speed of a universal motor is usually reduced by using gearing.
asked
Mar 20, 2018
by
anonymous
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.
asked
Mar 20, 2018
by
anonymous
Answer :
The speed control of universal motor used for sewing machines is by varying the resistance.
asked
Mar 20, 2018
by
anonymous
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.
asked
Mar 20, 2018
by
anonymous
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.
asked
Mar 20, 2018
by
anonymous
Answer :
The speed/load characteristics of a universal motor is same as that of D.C. series motor.
asked
Mar 20, 2018
by
anonymous
Answer :
A universal motor can run on either A.C. or D.C.
asked
Mar 20, 2018
by
anonymous
Answer :
The speed of a universal motor is generally reduced by using gear trains.
asked
Mar 20, 2018
by
anonymous
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.
asked
Aug 17, 2019
by
anonymous
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
asked
Aug 17, 2019
by
anonymous
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.
asked
Jul 26, 2019
by
anonymous
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.
asked
Jul 20, 2019
by
anonymous
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
asked
Apr 29, 2018
by
anonymous
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.
asked
Apr 10, 2018
by
anonymous
Description : What is the direction of flow of current?
Answer :
Current flows from anode to cathode(opposite direction to flow of electrons)
asked
Mar 14, 2018
by
anonymous
Description : 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.
asked
Mar 14, 2018
by
anonymous
Description : What is the direction of flow of electric current in an electric circuit?
Answer :
It flows from anode to cathode (direction of holes flow)
asked
Mar 14, 2018
by
anonymous
Description : What is the direction of flow when charging a capacitor?
asked
Mar 15, 2018
by
anonymous
Description : 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.
asked
Mar 14, 2018
by
anonymous
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.
asked
Mar 20, 2018
by
anonymous
Description : 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 .
asked
Mar 14, 2018
by
anonymous
Description : What happens when you reverse the direction of the current in an electromagnet?
Answer :
When you reverse current direction in an electromagnet, the magnetic poles will also change.
asked
Mar 14, 2018
by
anonymous
Description : 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.
asked
Mar 14, 2018
by
anonymous
Description : What is the direction of the induced current?
asked
Mar 14, 2018
by
anonymous
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 . ..
asked
Oct 3, 2017
by
anonymous
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
asked
Mar 20, 2018
by
anonymous
Answer :
The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.
asked
Mar 20, 2018
by
anonymous
Answer :
By looking at Commutator part of the motor, it can be easily confirmed that a particular motor is D.C. motor.
asked
Mar 20, 2018
by
anonymous
Answer :
The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.
asked
Mar 20, 2018
by
anonymous
Answer :
Yes DIAC can conduct in both direction.
asked
Sep 20, 2017
by
anonymous
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.
asked
Mar 21, 2018
by
anonymous
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.
asked
Mar 26, 2018
by
anonymous
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.
asked
Mar 20, 2018
by
anonymous
Answer :
The current drawn by the armature of D.C. motor is directly proportional to the torque required.
asked
Mar 20, 2018
by
anonymous
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
asked
Apr 30, 2018
by
anonymous
Answer :
if induction motor rotates exceed than its synchronous speed, it acts as a generator.
asked
Sep 9, 2017
by
anonymous
Answer :
Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.
asked
Mar 6, 2018
by
anonymous
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
asked
Apr 14, 2018
by
anonymous
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.
asked
Mar 20, 2018
by
anonymous
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.
asked
Mar 20, 2018
by
anonymous