Answer / raseelrasheed

ANSWER IS SIMPLE....FAN IS A SINGLE PHASE INDUCTION
MOTOR....EVERY MOTOR HAVE FIELD AND ARMATURE,FIELD AND
ARMATURE ARE OPPOSING IN NATURE,SO FIELD TEND TO ROTATE
CLOCKWISE WHERE ARMATURE TEND TO ROTATE IN ANTI-CLKWISE.

IN CEILING FAN FIELD IS TAKEN AS STATIONARY AND ARMATURE
ALOWED TO ROTATE,SO ITS ROTATION IN ANTI CLKWISE,HENCE LEAF
CONNECTED TO ARMATURE IT ROTATE IN ANTI-LOCKWISE.

WHERE IN PEDESTRAL FAN,ARMATURE IS TAKEN AS FIELD ROTATING
AND ARMATURE STATIONARY,HENCE LEAF CONNECTED TO FIELD IT
ROTATE IN CLOCKWISE.

Answer / sarmadahmed

I hope you know about the right hand rule, for example if you rotate a screw anticlockwise it will loosen and when clockwise it tightens. Let the movement be the output whose direction can be determined by the right hand rule (curl=movement, face of thumb=direction of output).
By keeping this in mind, let the air (by the fan) be the output, ceiling fan is required to throw the air downward so these're made to rotate clockwise and exhaust fan is required to throw the air in the other direction, these're made to rotate counter clockwise.

Answer / engr. kashif

I get what ur trying to say by using the right hand rule and it does make sense. r u talkin about flemmings right hand rule...but that involves magnetic fields......then which rule is this?? some rule of aerodynaimcs is it.

Answer / vigneshwaran

because of polarities

Answer / sarmadahmed

That's a universal rule relating cause and effect, I screwed
this question from my daily observations, Fleming's rule is
the form of this universal rule for magnetic and electric
fields. But this law works everywhere, like screw, rolling belt, well bucket or alot of things.

Consider a case that two 200 hp motors are connected to 500KVA transformer. For improving power factor can we add capacitors in common bus bars to motors. Or should we add capacitors for each individual motor?

2 Answers  

suppose there is afault in transmission line connected to a generating station, then what r the adjustments u will take to without loss of synchronism?????

2 Answers   NTPC,

HOW MANY EARTHINGS REQUIRED FOR GENERATER

10 Answers   Juniper Networks,

What are the reasons for the parallel operation of transformers?

0 Answers  

If we have to find the inductance of a dc shunt motor then by giving dc supply or ac supply and what is the reason for it. (this example is from "to determine the transfer function of a dc shunt motor ")

0 Answers  

what is difference betwen genrator and alternator?

3 Answers   Tanfac,

If we want the fan to consume less electricity at low speed, what do we have to do?

1 Answers  

What is the meaning of floating point earthing in battery backed systems ?

0 Answers  

at work i have a genertor/alternater what is the easyest way to work out if it is dc or ac?

0 Answers  

A 3PH MOTOR RUNNING IN NORMAL CONDITION AND ITS AMPERE ALSO UNDER ITS FULL LOAD CURRENT,ITS CABLE RATINGS ALSO HIGER THN ITS CAPACITY,BUT ITS CABLE GETTING ABNORMAL HEAT(NOT TOO HOT)WHY ITS GETTING HOT LIK THIS

2 Answers  

how winding temperature detects in power transformer...?

5 Answers   Roverco,

why the neutral point in connnection oscillates?

0 Answers   Avalon,