A room is to be illuminated with the help of 12 lamps of 200 watts rating each giving an output of 15 lumens per watt. The dimension of the room is 6 m by 12 m. If CU = 0.60 and MF = 0.80. The average illumination on the floor is... %3D
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- What load may be used for an electric range rated at not over 12 kW? (Table 220.55) _____An industrial assembly hall is continuously lightedby one hundred 40-W mercury vapor lamps suppliedby a 120-V and 60-Hz source with a power factor of0.65. Due to the low power factor, a 25 percent penaltyis applied at billing. If the average price of 1 kWh is$0.01 and the capacitor’s average price is $50 permillifarad, compute after how many days of operationthe penalty billing covers the price of the power factorcorrection capacitor. (To avoid penalty, the powerfactor must be greater than 0.85.)Exercise 2: Resistance-Capacitance Series Circuits on an AC Supply Calculate (a) peak to peak voltage (b) time period (c) Total impedance (d) Total voltage and (e) Voltage across the resistor for the circuit given.
- Draw block diagram of solar photovoltaic system which generates DC power and supply AC power(220V and 50Hz) to the load.Discuss the concept of power quality in a power system and the various issues, such as harmonics and voltage sags, that can affect it.Three coils each having resistance 6 and inductance are connected in star with 415V. If the line current is 30 A: a) find the value of inductive reactance as well as inductance value? B) If θ = 45 then calculate the power dissipation in kW when it is connected in Delta.
- QA) The apparent power for an electric network was measured and found to be 360.6VAZ-56.34% 1. Determine the power factor of the network and sketch the power triangle. 2. Identify the elements of the network and provide a reason justifying your answer. B) Define the permeability (ur) of the material. If you are required to design IH and I uH inductors, what type of core will you use in your design and why? support your answer by equations.Q5 What is Co-Generation power plant and its benefits?An automotive alternator is rated 500 VA and20 V. It delivers its rated voltamperes at a powerfactor of 0.85. The resistance per phase is 0.05Ω , andthe field takes 2 A at 12 V. If the friction and windageloss is 25 W and the core loss is 30 W, calculate thepercent efficiency under rated conditions.
- A 240-V rms 60-Hz supply serves a load that is 10 kW (resistive), 15 kVAR (capacitive), and 22 kVAR (inductive). What is the current drawn from the supply in amperes? And what is the required capacitor rating in microfarads required to improve the power factor to 0.96 ?A supply of 250 V, 80 Hz is connected across an inductive load and the power consumed is 2 kW, when the supply current is 10 A. Determine the following: (a) The resistance of the circuit in ohm. (b) The inductance of the circuit in mH. ) (c) The power factor of the circuit.Derive the relationship for maximum power Eb = v/2