In a shaded pole motor, the shading coil usually consist of?

With a neat sketch give the working of shaded pole induction motor.
Last Answer : Explanation: It has squirrel cage rotor and salient pole stator. The stator poles are shaded partially by short circuited conductor band to create the phase difference between the fluxes emerging from shaded ... rotating magnetic field in the air-gap and torque is exerted on the squirrel cage rotor.

264 views 2 answers

asked Apr 27, 2020 by anonymous

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

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

125 views 1 answer

asked Jul 26, 2019 by anonymous

Locked rotor current of a shaded pole motor is?

Last Answer : Locked rotor current of a shaded pole motor is slightly more than full load current.

85 views 1 answer

asked Mar 20, 2018 by anonymous

The shaded pole motor is used for?

Last Answer : The shaded pole motor is used for low starting torque.

63 views 1 answer

asked Mar 20, 2018 by anonymous

The range of efficiency for shaded pole motors is?

Last Answer : The range of efficiency for shaded pole motors is 5% to 35%.

120 views 1 answer

asked Mar 20, 2018 by anonymous

The torque produced in induction type relay (shaded pole structure) is?

Last Answer : The torque produced in induction type relay (shaded pole structure) is inversely proportional to the square of the current.

829 views 1 answer

asked Mar 20, 2018 by anonymous

The power factor of a single-phase induction motor is usually?

Last Answer : The power factor of a single-phase induction motor is usually lagging.

189 views 1 answer

asked Mar 20, 2018 by anonymous

In a A.C. series motor armature coils are usually connected to commutator?

Last Answer : In a A.C. series motor armature coils are usually connected to commutator through resistance.

161 views 1 answer

asked Mar 20, 2018 by anonymous

The efficiency of a properly designed synchronous motor will usually fall in range?

Last Answer : The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.

73 views 1 answer

asked Mar 20, 2018 by anonymous

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will?

Last Answer : If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.

257 views 1 answer

asked Mar 20, 2018 by anonymous

what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?

what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?
Last Answer : When excitation of an unloaded salient pole synchronous motor suddenly gets disconnected the motor will stop.

367 views 1 answer

asked Mar 18, 2018 by anonymous

The adjustment of position of shading bands, in an energy meter is done to provide?

Last Answer : The adjustment of position of shading bands, in an energy meter is done to provide friction compensation.

199 views 1 answer

asked Mar 21, 2018 by anonymous

State the function of overload coil and No volt coil in dc motor starter.

State the function of overload coil and No volt coil in dc motor starter.
Last Answer : Function of Overload Coil: When DC motor is overloaded, the overload coil carries the overload current and produces strong magnetic field to attract a plunger, which short the terminals of ... dc motor is prevented from restarting automatically on recovery of supply without starter and protected.

344 views 1 answer

asked Jul 27, 2019 by anonymous

Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

Power factor of an inductive circuit is usually improved by connecting capacitor to it in?
Last Answer : Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.

278 views 1 answer

asked Mar 25, 2018 by anonymous

The braking retardation is usually in the range?

Last Answer : The braking retardation is usually in the range 10 to 15 km phps.

244 views 1 answer

asked Mar 22, 2018 by anonymous

The voltage used for suburban trains in D.C. system is usually?

Last Answer : The voltage used for suburban trains in D.C. system is usually 600 to 750 V.

89 views 1 answer

asked Mar 22, 2018 by anonymous

Overload capacity of diesel engines is usually restricted to?

Last Answer : Overload capacity of diesel engines is usually restricted to 2 percent.

128 views 1 answer

asked Mar 22, 2018 by anonymous

Pole Climbing & Attention to Street Light, Jumpers & Insulator Checking & Replacement of Insulator?

Pole Climbing & Attention to Street Light, Jumpers & Insulator Checking & Replacement of Insulator?
Last Answer : Ans. (a) Before pole climbing, supply to be disconnected (b) While climbing safety belt, helmet to be used. (c) While attending street light, safety board to be displayed. (d) While providing jumpers ... non-essential (g) Essential loads to be brought to single point. (h) Then connect UPS supply.

6 views 1 answer

asked Jun 20, 2021 by itszee

How to Rig a Fishing Pole

How to Rig a Fishing Pole
Last Answer : How to Rig a Fishing Pole Fishing can be a really exciting outdoor experience, not just a nap in the middle of a lake while holding a complicated stick. Rigging a fishing pole ... these steps, you can prepare your fishing equipment properly for a weekend afternoon of recreation and relaxation.

10 views 1 answer

asked May 18, 2021 by itszee

How to Build a Pole Barn ?

How to Build a Pole Barn ?
Last Answer : How to Build a Pole Barn How to Build a Pole Barn One of the simplest installations that you can make in your property is a pole barn. Usually found on agricultural land, a pole barn ... . Pond construction is also helpful if you want to add some extra features for your small household farm.

5 views 1 answer

asked May 9, 2021 by anonymous

A 50 Hz, 4 pole turboalternator rated at 20 MVA. 13.2 KV has an inertia constant H = 4 KW sec/KVA.

A 50 Hz, 4 pole turboalternator rated at 20 MVA. 13.2 KV has an inertia constant H = 4 KW sec/KVA. The K.E. stored in the rotor at synchronous speed is
Last Answer : A 50 Hz, 4 pole turboalternator rated at 20 MVA. 13.2 KV has an inertia constant H = 4 KW sec/KVA. The K.E. stored in the rotor at synchronous speed is 80 MJ

1.5k views 1 answer

asked May 3, 2018 by anonymous

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents
Last Answer : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only

193 views 1 answer

asked Apr 29, 2018 by anonymous

Salient pole rotor is use for which speed?

Salient pole rotor is use for which speed?
Last Answer : Salient pole rotor is use for low and medium speed prime movers.

100 views 1 answer

asked Mar 18, 2018 by anonymous

Explain MOSFET gate drive circuit and totem pole configuration.

Explain MOSFET gate drive circuit and totem pole configuration.
Last Answer : MOSFET gate drive circuit: The turning on and turning off of MOSFET can be controlled from gate to source voltage signal. If the gate to source voltage of MOSFET exceeds threshold ... this configuration, the two switches (transistors) are used in totem pole arrangement with a comparator.

348 views 1 answer

asked Feb 19, 2018 by anonymous

Single phase induction motor usually operates on?

Last Answer : Single phase induction motor usually operates on 0.6 power factor lagging.

126 views 1 answer

asked Mar 20, 2018 by anonymous

The motor used on small lathes is usually?

Last Answer : The motor used on small lathes is usually single-phase capacitor run motor.

146 views 1 answer

asked Mar 20, 2018 by anonymous

What do you mean by coil?

What do you mean by coil?
Last Answer : Ans. Having one or more turns connected in series is called coil.

3 views 1 answer

asked Jun 20, 2021 by itszee

A permanent-magnet moving-coil instrument gives full-scale deflection with 5 mA

A permanent-magnet moving-coil instrument gives full-scale deflection with 5 mA and has a resistance of 5 Ω. Calculate the resistance of the necessary components in order that the instrument may be used as (i) a 2 A ammeter & (ii) a 100 V voltmeter.

9 views 0 answers

asked May 12, 2021 by snehil31

Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.
Last Answer : (i) Material used for Moving coil: Copper, Aluminum( some times) (ii) Permanent magnets are made of special alloys such as : Aluminum-Nickel-Cobalt (Alnicos) Strontium-Iron Neodymium-Iron-Boron Samarium-Cobalt.

213 views 1 answer

asked Sep 6, 2018 by anonymous

State the material used for moving coil and former for PMMC instruments.

State the material used for moving coil and former for PMMC instruments.
Last Answer : Material Used for Moving Coil and Former for PMMC Instruments: Material used for moving coil: Copper Material used for Former: Aluminium

169 views 1 answer

asked Sep 5, 2018 by anonymous

The purpose of the restraining coil in a biased differential relay is

The purpose of the restraining coil in a biased differential relay is (A) To reduce CT saturation during fault. (B) To increase the sensitivity of the relay. (C) To match the transformation ratio. (D) To limit the spill current through the relay during heavy external fault.
Last Answer : d

700 views 2 answers

asked May 8, 2018 by anonymous

Permanent magnet moving coil instruments are used for

Permanent magnet moving coil instruments are used for
Last Answer : PMME are mostly used for measuring voltage and current.

2.6k views 2 answers

asked May 8, 2018 by anonymous

Peterson coil is used for :

Peterson coil is used for : (A) shunt compensation of lines (B) grounding of system neutral (B) reduce fault currents (D) connecting interconnected systems
Last Answer : Peterson coil is used for : grounding of system neutral

705 views 1 answer

asked Apr 29, 2018 by anonymous

A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned

A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carrier current capacity is 50 mA. The torque on the coil is
Last Answer : A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carrier current capacity is 50 mA. The torque on the coil is 200µNm

737 views 1 answer

asked Apr 29, 2018 by anonymous

A Peterson coil is ________

A Peterson coil is ________ A) An arc generating coil B) An arc suppressing coil C) An arc inducing coil D) None of these
Last Answer : A Peterson coil is An arc suppressing coil

101 views 1 answer

asked Apr 29, 2018 by anonymous

The self inductance of a coil can be measured using

The self inductance of a coil can be measured using (A) Wien’s Bridge (B) Schering Bridge (C) Anderson’s Bridge (D) Wheatstone Bridge
Last Answer : The self inductance of a coil can be measured using Anderson’s Bridge

174 views 1 answer

asked Apr 28, 2018 by anonymous

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω
Last Answer : A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is 1.001 Ω

358 views 1 answer

asked Apr 28, 2018 by anonymous

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω
Last Answer : A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is 9997 Ω

190 views 1 answer

asked Apr 28, 2018 by anonymous

lt the length, number of turns and area of a coil are doubled, the inductance of the coil

lt the length, number of turns and area of a coil are doubled, the inductance of the coil
Last Answer : lt the length, number of turns and area of a coil are doubled, the inductance of the coil is quadrupled

136 views 1 answer

asked Apr 26, 2018 by anonymous

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%
Last Answer : The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is 11%

319 views 1 answer

asked Apr 25, 2018 by anonymous

The initial rate of rise of current through a coil of inductance 10 H when suddenly...

The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs.
Last Answer : The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is 20 Vs

269 views 1 answer

asked Mar 25, 2018 by anonymous

The rate of rise of current through an inductive coil is maximum?

The rate of rise of current through an inductive coil is maximum?
Last Answer : The rate of rise of current through an inductive coil is maximum at the start of the current flow.

600 views 1 answer

asked Mar 25, 2018 by anonymous

The inductance of a coil can be increased by?

The inductance of a coil can be increased by?
Last Answer : The inductance of a coil can be increased by choosing core material having high relative permeability.

300 views 1 answer

asked Mar 25, 2018 by anonymous

Inductance of coil?

Inductance of coil?
Last Answer : Inductance of coil increases with the increase in supply frequency.

68 views 1 answer

asked Mar 25, 2018 by anonymous

Inductance of a coil Varies?

Inductance of a coil Varies?
Last Answer : Inductance of a coil Varies as directly as the cross-sectional area of magnetic core and inversely as the length of the iron path.

93 views 1 answer

asked Mar 25, 2018 by anonymous

In a low power factor wattmeter the compensating coil is connected?

Last Answer : In a low power factor wattmeter the compensating coil is connected in series with pressure coil.

487 views 1 answer

asked Mar 21, 2018 by anonymous

In a low power factor wattmeter the pressure coil is connected?

Last Answer : In a low power factor wattmeter the pressure coil is connected to the load side of the current coil.

374 views 1 answer

asked Mar 21, 2018 by anonymous

anonymous · Answer 1 · 2018-03-20T18:54:34+0000

In a shaded pole motor, the shading coil usually consist of a single turn of heavy copper wire which is short-circuited and carries only induced current.

In a shaded pole motor, the shading coil usually consist of?

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