4. Which type of duct undergoes more rigorous testing before it's labeled?
1 answer:
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Answer:
(a)
and
(b) lagging
Explanation:
Given Data:
(a) Find the required kVAR rating of a capacitor
°
°
The required compensation reactive power can be found by
The corresponding capacitor value can be found by
(b) calculate the resultant supply power factor
First convert the hp into kW
Find the electrical power (real power) of the motor
where is the efficiency of the motor
The current in the motor is
The pf of motor is 0.85 Leading
Note that represents the angle in complex notation (polar form)
Now find the Load current
pf of load is 0.75 lagging (notice the minus sign)
Now the supply current is the current flowing in the load plus the current flowing in the motor
or in polar form
°
Which means that the supply current lags the supply voltage by 24.78
therefore, the supply power factor is
lagging
Which makes sense because original power factor was 0.75 then we installed synchronous motor which resulted in improved power factor of 0.90