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A shaded pole motor can be used for toys, hair dryers, circulators etc.

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

Answer : In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.

Answer : In a shaded pole single-phase motor, the revolving field is produced by the use of shading coils.

Answer : 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.

Description : With a neat sketch give the working of shaded pole induction motor.

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.

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.

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

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

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

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

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

Answer : When excitation of an unloaded salient pole synchronous motor suddenly gets disconnected the motor will stop.

Answer : In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.

Answer : The repulsion-start induction-run motor is used because of high starting torque.

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

Answer : A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

Description : State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 

Answer : The insulating materials used in motor are as belows: 1. Cotton, 2. Silk, or paper, 3. Press board, 4. Resins 5. PVC 6. Cellulose-Fiber, 7. Enameled coating, etc  ... Over 180° Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.

Description : State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor 

Answer : Name the starters used for following motors : i) 3 H.P. 3-Ph squirrel cage I.M: i) DOL starter OR ii) Star-Delta Starter OR ii) Auto transformer starter OR iii) Soft start starter.  ii) D.C Shunt Motor : 1) Armature resistance starter (Three Point Starter) OR 2) Four Point Starter 

Description : The motor used for electric traction is  (1) D.C. shunt motor (3) D.C. series motor  (2) D.C. compound motor (4) Synchronous motor

Answer : The motor used for electric traction is D.C. series motor

Answer : The type of D.C. motor used for shears and punches is cumulative compound D.C. motor.

Answer : The motor used for the compressors is capacitor-start capacitor-run motor.

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

Description : Why DC motor is used for traction?

Answer : The electric motor used in portable drills is universal motor.

Description : The damping winding in synchronous motor is generally used to?

Answer : The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

Description : Which type of starter is used to start the DC motor?

Description : Which type of motor is used in lift?

Answer : Synchronous motor

Description : Which motor is used in traction system?

Description : Salient pole rotor is use for which speed?

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

Answer : Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.

Answer : In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.

Description : 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

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

Description : 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

Answer : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only

Description : Explain MOSFET gate drive circuit and totem pole configuration.

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.

Answer : The wattage of motor for driving domestic sewing machine will be around 100 to 150 W.

Answer : The wattage rating for a ceiling fan motor will be in the range 50 to 150 W .

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

Answer : A schrage motor can run on zero slip, negative slip, positive slip.

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

Description : The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?

Answer : The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be 4.

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.

Description : The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?

Answer : The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be at the slot edge where coil enters or comes out of the slot.

Answer : The value of starting capacitor of a fractional horse power motor will be 300 uF .

Description : The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?

Answer : Ns         equals        f/pair pole 50/4      - 12.5

Answer : Short-circuiter is used in repulsion start induction run motor.

Description : In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians (A) Armature amp-conductors × (θ/360o) (B) Armature amp-turns × (θ/360o) (C) Armature amp-conductors × (1/4 - θ/360o) (D) Armature amp-conductors × (1/8 - θ/360o)

Answer : In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians Armature amp-conductors × (1/8 - θ/360o)

Description : Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Answer : Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Answer : The under voltage relay can be used for generators, busbars, transformers, motors.

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

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

Answer : In A.C. series motor compensating winding is employed to reduce sparking at the brushes.

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