Answer / stella

The purpose of a motor starter is to start a motor manually or automatically from a position close to the motor or remotely(some distance away).the function of a motor starter,other than a direct-on-line starter,is to reduce the current drawn by the motor while the rotor accelerates.

Answer / shekhar

starter is used to protect the motor from blasting due to
high current,initially its reduce the current flow through it.

Answer / ia

a) to increase starting voltage
b) to increase starting current
c) to increase starting torque
plz tell me which is the right answer

Answer / pasdxa

the function is to start the motor by turning the
flywheel..........

Is any generator is developed which is operated with out diesal or other expensive source?

0 Answers  

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how one can know the charging time, discharging time of a 12 VDC battery ? If i have a battery of 12 VDC , 4.0 AH , how long will it take to charge from a charger (power supply) of input 220 V , Output 15 V and output current of 3000 mA and how long will it take to discharge whether using or not ? How much backup will it give ?

1 Answers   ONGC,

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How transformer winding & oil gets heat.

3 Answers  

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now a shunt motor is practically a constant speed motor , then how does it meet the increase or decrease in the load ?

1 Answers  

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following are the questions asked in interviews: 1) Considering the short circuit fault, which switchgear is preferable, SFU OR MCCB? Which operates faster? whicg one is popular in Indian Market and why? 2)Define SCPD. What is type2 coodination? 3)Why the contactor rating is higher for the fuseless selection than for fuse selection? whether the ratinf of SFU or MCCB remains the same in both the cases? 4)If the HP rating is known then can you calculate the ratings of L.V Switchgear(SFU/MCCB, contactor, OLR) without using the selection chart?

0 Answers  

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in alternator permanent magnet generator is also connected on the alternator shaft,then y that PMG voltage is very low as compared to alternator?

1 Answers  

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When one of three series resistors is removed from a circuit and the circuit is reconnected, the current

1 Answers  

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What happen if we apply square wave or traiangular waveform voltage to the transformer primary winding instead of sinusoidal wave?

0 Answers  

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what is the physical phenomenon because of which skin effect occurs ??

6 Answers   Power Grid,

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if v r considering a 4000/1A ct,if v inject 1 amps in secondary core wat happens?(consider as 2 core ct,each for metering and protection)

1 Answers  

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Why in medium voltage system(3.3kv to 33kv, neutral is earthed with either resistance, reactance or neutral grounding resistance?

4 Answers   Essar,

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Why we are not placing c.B 's btwn generator and transformer.? what happens when generator gets disconnected from transformer when it is running @ full load?

3 Answers   Areva,

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