Answer / pravin kumar

uninterrupted power supply is ups.

dc to ac converter is inverters.

Answer / vineet kumar

While both provide backup power during mains outage, with
the UPS the switch is instantaneous whereas with the
Inverter there is a gap of a second or two. This gap is OK
for household gadgets such as lights, fans, fridge, etc. but
not OK for computers.

In technical terms:

UPS: The mains power comes to the UPS. The AC is converted
to DC and this DC is constantly charging the battery. The
output of the battery is fed to the Sine wave inverter and
it converts DC to AC and this feeds the equipment. Since
power out is always drawn from the battery, there is no time
lag when mains swicthes off; it justs stops the battery from
being charged and the UPS continues to supply power till the
battery runs out.

Inverter: The mains power comes to the Inverter. This is
directly sent to the output but the AC is also converted to
DC and this DC is constantly charging the battery. A sensor
and relay mechanism checks whether the mains is ON or OFF.
When the main switches OFF, the relay actuator triggers to
switch from mains to inverter. Rest is same like the UPS.
Because of this sensor and relay, there is a gap between
triggering.

UPS involves more costly circuitary and is therefor more
expensive to make and sell.

As a water tank loses heat, the temperature drops by 2 K/min when a heater is on, the system gains temperature at 4 K/min. A two-position controller has a 0.5 min control lag and a neutral zone of ± 4% of the setpoint about a setpoint of 323 K. Plot the heater temperature versus time. Find the oscillation period

0 Answers   Lafarge,

---

What is q-factor of the coil?

0 Answers  

---

please can any one send me BHEL ECE sample papers

0 Answers  

---

what is conductor? what is insulators? what is semi condutors?

5 Answers  

---

how to convert T-flipflop into D-flipflop?

5 Answers  

---

---

In which of the following is an operational amplifier (op-amp) used? a. Oscillators b. Filters c. Instrumentation circuits d. All of the above

4 Answers  

---

What is a rectifier?

0 Answers  

---

What is meant by virtual ground in the op amp ?

15 Answers   TCS,

---

hi .. i have done my b.e in under electronics and communication engineering and now i have opted for computer engineering which has most of communication related subjects. still what should i answer, if i am been asked "why didnt yu opt for electrical engineering"

0 Answers  

---

How to convert binary to excess 3 code and vice verse?

0 Answers  

---

How to answer for "tell me about yoursel interview question"? While telling project experience, whether we should start from lastest to old or old to latest?

3 Answers  

---

In interview we are asked "what is your positive and Negative points?"

34 Answers   Banking, IBM, ICICI, MK Group, Mphasis, NDA, Religare, TCS, Wipro,

---