Answer Posted / ramakrishnan

AH = (VA * Power factor)/(Output Efficiency * Vdc * K)

K is diversity factor
for 30 mins back up 0.9
60 0.5
120 0.3
240 0.2

Efficiency is 0.9
Pqwer factor is 0.9

Any doubt about UPS contact
98409 92005

Explain the working of variable frequency transformer?

1159

---

ITI r/tv trade APPLY (J.T.O VACANCEY) ALSO INCLUD AITT ELECTRONIC,WRITEEN XAM DONE 23.03.10 BUT NO RESPONCE WHY ANATHER ID gopal_gh007@rediffmail.com

3417

---

what is the range of maximum DOL and SDS can be use for pump and fan application

1118

---

what is ratio of copper wire size and current ?

1839

---

Explain Need of a starter in a dc motor.? Also explain any two starting and speed control method of dc motor?

1728

---

How to Prepare preventive maintenance shedule of machine tool.

2028

---

why ct ,cvt should be stored in a vertical position?

2659

---

what is sevice settings for mccb?How can be it setted?

2240

---

Types of test in Switchgears, MCC, NGR and DB's how it should be procced. Can anyone give me the details here or email me to pasuvaraj.k@gmail.com

2114

---

I am an American living in Vietnam and I have recently gotten a refrigerator from Japan and it is rated for 100 vac, but the power here is 220 so I bought a voltage stabilizer it has a 1 kva output rating. Can you please tell me what the amperage is? I'm confused and without a working fridge.

1741

---

why we cannot protect 100% winding of an alternator by using differential protection?

2259

---

CAN WE CALCULATE THE NEGATIVE SEQUENCE AND ZERO SEQUENCE REACTANCE OF A GENERATOR USING ONLY ITS RATED VOLTAGE, KW, PF AND SYNCHRONOUS REACTANCE??? IF YES, THEN HOW??

5647

---

how to find Harmonics and types as per the equipemnts

1298

---

how can you calculate fault level ?

2403

---

Why efficiency in thermal power plant is low?

1124

---