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Salient pole rotor is use for which speed?

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

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Description :

Which rotor is use for high speed in turbo alternators?

Answer :

Non-salient pole rotor is used for high speed in turbo alternators.

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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

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Answer :

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

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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.

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Answer :

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

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Description :

An electric motor in which both stator field and rotor rotates with same speed is called?

Answer :

An electric motor in which both stator field and rotor rotates with same speed is called synchronous motor.

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Answer :

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

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Description :

 Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span 

Answer :

Parameter LED CFL Lamp Efficiency  High (more than 70 lumen per watt) Comparatively less (50-60 lumen per watt) Life span (in working hours) 10000 3000

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List any four salient features of 8085 microprocessor

Answer :

Features of 8085:  1. 16 address line so 216=64 Kbytes of memory can be addressed.  2. Operating clock frequency is 3MHz and minimum clock frequency is 500 KHz.  3. On chip bus controller ... duty cycle TTL clock  10. Provide 2 serial I/O lines, so peripheral can be interfaced with 8085 μp

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State any four salient features of turbo- alternator.

Answer :

Special features of a turbo alternator used in TPS: Special Futures (Highlights): It is 3-phase generator. A separate excitation is given to alternator by DC generator ( ... under voltage protection. Over frequency under frequency protection. Over load protection. Over temperature protection 

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List out any four salient features of hydro generator.

Answer :

Following are the salient features of a Hydro Generator (alternator):  It is 3-ph hydro generator (alternator). It is robust in construction. A separate excitation is given to ... & under frequency protection, 5. Over temperature protection are main protections provided to generator.

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Is the speed of alternator is directly proportional to frequency?

Answer :

Yes, speed of alternator is directly proportional to frequency.

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In dc machines, the armature windings are placed on the rotor because of the necessity for  (1) electromechanical energy conversion (2) generation of voltage (3) commutation (4) development of torque

Answer :

3  Commutation

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Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor (A) is equal to that of a normal induction motor (B) is less than that of a normal induction motor (C) is greater than that of a normal induction motor (D) may be less or greater than that of a normal induction motor

Answer :

C

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Description :

Answer :

The shaded pole motor is used for low starting torque.

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Answer :

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

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Answer :

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

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The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm

Answer :

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min 200 rpm

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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

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Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.

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The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be

Answer :

The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be 0.5 Ohm

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Answer :

The bearings used to support the rotor shafts are generally ball bearings.

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The rotor of a hysteresis motor is made of chrome steel.

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Answer :

In a hysteresis motor, the rotor must have retentivity.

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Answer :

The rotor developed by a single-phase motor at starting is zero.

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What is the rotor of a motor?

Answer :

Rotor is the rotating or moving part in motor and generator.

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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.

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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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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

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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

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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 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.

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

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For constant torque drive armature voltage control speed control method is preferred.

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For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.

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

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The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.

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Can you use Python for Arduino?

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The number of cycles in which a high speed circuit breaker can complete its operation is  (A) 3 to 8 (B) 10 to 18 (C) 20 to 30 (D) 40 to 50

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In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

Answer :

In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

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Answer :

Series motor has the poorest speed control.

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Synchronous motor always runs at which speed?

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Synchronous motor always runs at synchronous speed.

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Which motor has the best speed regulation?

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Discrimination between main and back up protection is provided by the use of relays which are slow.

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The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

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The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.

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Speed control of the motor using TRIAC

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Why does the speed of a DC shunt motor decrease as the load increases?

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Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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Describe the following errors and their compensation: (i) Phase error (ii) Speed error

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