Answer / dr. surekha

Bolts are observer on the cover. these bolts are used to
hold poles. where as AC motors have smooth surface.

Presence of commutator at one of the end is s second
difference.

Answer / umang

1.For the same rating of motor , size of DC machine is
larger than AC machine
2.DC machine is identified by commutator
3.DC motors contains brush arrangement which sq.cage motor
is not having .

Answer / ankamsreekar

1.All DC machines are can be identified with commutator.

2.By seeing the cooling arrangement. since MOST of the DC
machines are provided with air blower for cooling. in case
of the AC machine end fan is provided.

Answer / karthick

dc machine can be identified by commmutator and bold net
arrangement


ac an be identified by slip ring or brush arrangement

What Factors should we consider while synchronizing two DG Sets?

5 Answers   Cushman Wakefield,

---

can anibody tel me on what basis the transformer vector groups are determined????

1 Answers  

---

In Megger which types of test we can do ? and How it works? How to use?

3 Answers   Power Grid,

---

what is purpose of manual bybass in ups

3 Answers  

---

A group of machines (wind turbines) connected with 33KV feeder and each machines are having individual VCB. The 33KV feeder connected with 110KV/33KV substation. The 33KV feeder tripped by over current at Substation and fault recorded at Substation as OC-R&Y phase. Same time the group of machines VCB tripped by over voltage, the fault recorded voltage was above 66KV by numerical Under/Over voltage relay. While grid drop time, this much of voltage hike is possible?

1 Answers  

---

what is the difference between 4pole & 6pole DC Motors & give advantage ?

0 Answers  

---

What is Nominal voltage?

3 Answers   Bhel, Equate,

---

what is differance between kvarh $ kvah

1 Answers  

---

What is ideal IR values for ground and neutral.

0 Answers   Hindustan Power Projects,

---

what should be 3phase motor capacity or rating to connect in star connection. what should be 3phase motor capacity or rating to connect in delta connection. what should be 3phase motor capacity or rating to connect in star delta connection

1 Answers  

---

Do any one know exacatly when the results for NHPC held on 8th march 09 for engineering trainees will be released ?. if so please post it, i'm eager to know it.

0 Answers   NHPC,

---

what is transient earth voltage

2 Answers  

---