Answer / kn afridi

Heating and cooling time constants are generally given by the motor manufacturer.

This is the time required by the motor to reach 63.2% of its steady state temperature T when run with full load.

Heating time constant (t) is given by the formula (1-1/e) T= (1-1/2.718) T= 0.632T

If the steady temperature T attained by the motor is 90 degree C (say) when started from cold condition, the heating time constant in minutes will be the time required by the motor to reach 57 degree C. This can be noted during the heat run test on the motor under rated condition.

Answer / thabo

A motor with a time constant of 120 minutes is rated at 40 kW continuously .compute the half hour rating for the same temperature if it starts from room temperature every time.

I completed my BE EEE degree 2006 .... which license should i apply .... ?????

0 Answers   Real Estate,

---

what are the compensations considered while designing a transmmision line.

1 Answers  

---

why PT Primary are the grounded?

5 Answers   L&T,

---

who & how the notations given as RYB to 3phase power supply.

1 Answers  

---

IP55 protection stands for

1 Answers   Hofincons,

---

---

what is difference b/t ac current and dc current

4 Answers   L&T, Meghana Engineers,

---

HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL STARTER? & in dol why it is require circuit breaker?

6 Answers   DLF,

---

some time we open engine breaker 8.0 MW load but plant not trip. and another time engine open 4.0 MW load engine trip why? individually engine breaker open & individually emergency stop why difference?

0 Answers  

---

What is the use of doing meggering for a cable

2 Answers  

---

what happens to the water pump if ground water level is slowly decreasing?our water pump is varying from no-load full-load due to this problem

0 Answers  

---

why u r living from presentaly working.

0 Answers  

---

Testing procedure of DG alternator stability test

0 Answers   Amprotec,

---