Question { 5525 }

what is soft starter?
what is the difference between soft starter and star delta
starter?

Answer

star delta starter : it is a set of electrical equipments used to control the current during the starting of induction motor as the starter operates the motor in star configuration in starting and then in delta configuration.

soft starter : it is a set of electronic components which control the nominal voltage of induction motor in order to control high current and torque during starting resulting in prevention of voltage dips and mechanical stress over the machinery .

Question { 4796 }

mounting of bucholz relay engle on transformer

Answer

12 degrees

Question { Crisp, 5470 }

If the battery is in charging condition means, battery is
which type of load? Capacitive or Resistive load?

Answer

capacitive

Question { 3953 }

Motor running trough VFD, if voltage reduced speed will be?

Answer

ifbthe motor is running in constant torque mode then decreasing the voltage will result in increase in frequency hence speed will increase in constant torque mode otherwise speed will decrease

Question { Khidmah, 3700 }

what is the meaning of TRF

Answer

in cold rolling mills we use TRF as a notation for total roll force

Question { 2261 }

What is the main feature of v/f control?

Answer

v/f control means controlling the motor with constant torque by varying the voltage (V) or Frequency (F) as torque is proportional to ratio v/f

Question { Sedemac, 4314 }

if reactive power become zero in transmission system then what effect on system.???

Answer

Zero reactive power means the transmission line is purely resisitive which is practically not possible, even though if it happens there will be no losses in transmission

Question { 12021 }

what is function of centrifugal switch in single phase induction motor..?

Answer

centrifugal switch is used for diconnecting the starting winding from the motor once it reaches the normal operating speed.

Question { GOMS, 2482 }

Does Rheostat can use for power factor correction?

Answer

no it can not be used for power factor correction as rheostat is a purely resistive thing and if u want to control pf u need to use either capacitive or inductive material in the circuit