Q1. A station supplies 250 kVA at a lagging power factor (p.f) of 0·8. A synchronous...

Q1. A station supplies 250 kVA at a lagging power factor (p.f) of 0·8. A synchronous motor is connected
in parallel with the load. If the combined load is 250 kW with a lagging p.f. of 0.9, determine :
(i) the leading kVAR taken by the motor.
(ii) kVA rating of the motor.
(iii) p.f. at which the motor operates.

Q2. A factory consists of the following
(i) An induction motor of 150 h.p with 0.7 p.f lagging and 80% efficiency.
(ii) A synchronous motor of 100 h.p with 0.85 p.f leading at 90% efficiency.
(iii) A lightning load of 50kW.
Find the annual electric charges if the tariff is Rs 100 per annum per kVA maximum demand plus 7
paise per kWh ; assuming the load to be steady throughout the year.

Solutions

Expert Solution

please comment if u had any doubt

Manojponduru answered 1 year ago

Next > < Previous

Related Solutions

Table 1 Load Rating Power Factor Lighting 41.1kW 0.7 Lagging Lights 12.2 kVa 0.67 Lagging Ventilation...

Table 1 Load Rating Power Factor Lighting 41.1kW 0.7 Lagging Lights 12.2 kVa 0.67 Lagging Ventilation fans 9 kVa 0.7 lagging Heat pump 18 kW 0.707 Lagging misc equipment 11.3 kVa 0.55 lagging peak charging demand 209 kW unity Calculate the following for the car park using the data from Table 1: a) the maximum real power demand P (kW) b) maximum reactive power demand Q (kVAr) c) the total apparent power demand S (kVA) d) also, calculate the maximum...

1) A 25 kVA transformer supplies a load of 12 kW at power factor of 0.6...

1) A 25 kVA transformer supplies a load of 12 kW at power factor of 0.6 lagging. How much kVA can be added before the transformer is at rated load a)when the added load is at 1.0 pf? b)when the added load is at 0.866 pf leading?

2.A n+400-k VA, 2300+n- 230+n-v, 60-hz transformer supplies a 0.8 lagging power-factor load whose KVA Is...

2.A n+400-k VA, 2300+n- 230+n-v, 60-hz transformer supplies a 0.8 lagging power-factor load whose KVA Is adjustable from no load to 120 percent rated KVA. The percent resistance, percent reactance, and percent core loss are m+1.56, m+3.16, and m+0.42 respectively. For 2 KVA increments of load, tabulate and plot the efficiency of the transformer from no load to 120 percent rated load. Use Matlab n=20 m=.2

480 V, 200 kVA, 08 PF lagging, 60 Hz two pole Y connected synchronous generator has...

480 V, 200 kVA, 08 PF lagging, 60 Hz two pole Y connected synchronous generator has a synchronous reactance of 0.25 Ω and an armature resistance of 0.03 Ω. At 60 Hz, its friction and windage losses are 6 kW, and its core losses are 4 kW. The field circuit has a dc voltage of 200 V, and the maximum IF is 10 A. The resistance of the field circuit is adjustable over the range from 20 to 200 Ω....

Subjects