Answer / balakrishnan

servo motor-closed loop system where as induction motor is a
open loop system.

Answer / mustafa

Servo motors used to control speed systems.It varies the
field current applied to the generator which in turn
controls the speed of the motor connected.
Induction motor will work on synchronus speed .

Answer / narayan jaiswal

Servomotor is ac/dc motor controlled using servo-mechanism. It is negative feed-back controlled (closed loop) using position sensor. It does not rotate continuously but mostly upto 180 degrees. Its speed is reduced (torque increased) by gear mechanism. It is used when precise positioning is needed. General purpose DC servomotors are controlled by PWM signal. Pulse is repeated for every 20ms.

Induction motors rotate continuously as open loop system. There is no feed-back control.The speed may be varied but position cannot be controlled precisely.

What is effect on in zone and out zone fault if CT chosen for phase side is Vk/2<5mA and Neutral side is Vk/2<15mA on REF protection of Transformer

0 Answers   ABB,

---

What is the RMS and DFT principle of analogue maesurments. Which way they are advangages. where which princples give optimum results.

0 Answers   ABB,

---

what is meant by displacement & magnitude ?

2 Answers  

---

IF i have switchgear with busbar current rating of 1000Amp 35kA then is it necessary to have outgoing breaker kA rating to be equal to busbar kA rating?

6 Answers   L&T,

---

single phase can run in PVC conduit. Three phase can also run in one PVC conduit. But two phase cannot run in one PVC conduit. WHY? reply plz....awaiting your answer.

8 Answers   L&T,

---

What is the difference between single core 2 wire and single core 3 wire system? Which application we are using this? and for What purpose we are using this?

0 Answers  

---

The specific heats of the gas at constant pressure and constant volume are respectively 1.0 kJ/kg K and 0.72 kJ/kg K; the value of R for the gas is

0 Answers   Caterpillar,

---

A simple Question from all.... If Voltage drops then its rated value what will be effect on a Residential load? similarly if voltage rises from its rated value then what will be effects on a load? i know if voltage drops the equipment or device draws more current then its rated what are other reasons ? thanks in advance for ur time.......

1 Answers  

---

why do transformer make a sound

4 Answers  

---

wat is the role of reactive power in power generation?why we have maintain it.

3 Answers  

---

what is meant by leakage current of a capacitor?

1 Answers  

---

WHAT IS SITTING AMPS IN OVER-LOAD RELAY FOR 1PH OR 3PH MOTORS?IF ITS NAME PLATE GIVEN MAX AMPS 10AMPS?

1 Answers  

---