Answer / wasif arshad

in simple words it is a very small air handling unit and
suspended above the false ceiling. A small blower throws
air which when strikes with the coil becomes hot or cool as
the case may be.

CFM (cubic feet per minute) can be calculated by the help
of cfm meter. it simply consists of a fan and a display
unit. When the fan is taken in front of diffuser it rotates
with a fix speed depending on the speed of air. Fan is
connected with a switch which produces fix no of impules
depending on its speed. Hence these impulses are sent to
the display unit at which these impulese appear in the form
of cfm

Answer / sag

The Area of the Diffusser is taken in to consideration and
velocity of the air. by this we can calculate the CFM

Answer / ali

1-How can i calculate the required air flow for a space?
2-how can i calculate the air flow for a FCU if i know its BTU or tonage?

a distribution transformer(3 phase)supplying 440volt per phase.now suppose one of phase voltage(230volt) becomes zero.what will be the cause ?

3 Answers  

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Why not using Air circuit breaker at High tension side?

1 Answers   Wipro,

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What are the usege & different between UPS & batteries with charging system in in Substation?( UPS 120V AC & battery charger is 120v DC)

1 Answers  

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why rating of transformer is in KVA but of motor is in KW

4 Answers  

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Why the generating station rating is in KW though the rating of generators in KVA?

8 Answers   HAL,

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A 2D array X(7,9) is stored linearly column wise in a computers memory.Each element requires 4 bytes for the storage of the value.If the first byte address of X(1,1) is 3000,what could be the last byte adress of X(5,8)?

2 Answers   TCS,

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why phase & neutral is use in tv? why earthing not use ?

2 Answers  

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At site, we have 30Kw motor (3 phase, 400V,50Hz) and FLC 54A as per the nameplate. At the time of starting it draws 840A instead of 390A (7.2%). As per the data sheet also its 390A starting current. it thru a dol starter from the MCC. can anyone tell what is the problem in the motor

5 Answers   ME,

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If the load of transformer is getting more than its rating,,,than how to overcome this problem? Suppose thee rating of transformer is 315kva and the load is going beyond than the rating say around load: 352kva... Than how can we solve this problem without deducting the load.

14 Answers   Hyundai,

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What happen if 200KVAR capacitor continuesly connected to load and all the plant machinaries are not in working?

4 Answers  

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what should we do when the CT secodary gets open? how do we short circuit it? using tester or screw driver? not dangerous?

6 Answers  

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what is called star connection and delta connection also purpose of this connections?

3 Answers   Siemens,

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