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How to calculate d and z values?
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A uniform illumination of 150 lux is to be obtained on the floor of a room measuring 15m x 15m by arranging electric lights suitably. Calculate the number of lamps and wattage of each ... lamp efficiency is 20 lumens/watt. Assume and write suitable values of constants required for this calculation.

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A three-phase transformer having a line voltage ratio of 0.4 kV/11kV is connected Star/Delta and protective transformers on the 0.4 kV side have a current ratio of 500/5. Calculate the ratio of ... on the 11 kV side. Draw a neat circuit diagram and indicate the given values at appropriate places.

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What is the difference between D value and Z-value?

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What is the relation between line and phase values in a star and delta connected system?

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State significance of earthing. Draw and explain pipe earthing. State the values of earth resistances for: (i) Substation (ii) Residential wiring (iii) H.T. Line (iv) L.T. Line.

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Convert the following Boolean equation to standard SOP form and implement using NAND-NAND logic: (i) y = A'B'C' + ABC'D' + A'C'D' (ii) y = PQ + P'QR + PQR.

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How do you determine the component values in an SMPS?

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Write the expression for the instantaneous values of EMFs in a 3-phase circuit.
Answer : In a 3-phase circuit, the instantaneous values of the Electromotive Forces (EMFs) in the three phases can be expressed as sinusoidal functions, assuming a balanced system where the phases are 120° ... , these expressions show how the voltages in each phase are related in both magnitude and phase....

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Determine the power factor of an RLC series circuit with given values.

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what happen if we give 220 volts dc supply to d bulb r tube light?

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Is the superposition theorem applicable only to networks that are a linear b nonlinear c time invariant d passive?

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How to Calculate the charging Time and Charging current for battery Charging?
Answer : To calculate the charging time and charging current for a battery, we need to know a few basic parameters. Here's how to calculate each: ### 1. **Charging Current Calculation:** The charging ... of batteries have different safe charging currents. Let me know if you need more details on this!...

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How can you relate the z parameter to the y parameter?

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How do you convert ABCD parameters to Z-parameters?

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What is the difference between a Class D and Class E amplifier?

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What is the difference between a JK flip-flop and a D flip-flop?

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What is the relation between electric displacement d electric field e and electric polarization p in electrostatic units?

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What is the equation for the relation between electric displacement vector D and polarization P?

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What is the relationship between the displacement vector D and electric field strength E?

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What is the working principle of a D and D A converter?

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State the meaning of FACTS and explain in brief d-types facts controller.

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A wedge-shaped thin glass plate of refractive index 1.52 is used to observe fringes of equal thickness. The fringe spacing is 1 mm and the wavelength of light used is 5893 Å. Calculate the angle of the wedge.

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A 3 phase line of 4 km length delivers 4000 kW at a p.f of 0.8 lagging to a load the resistance and reactance per km of each conductor are 0.2 Ω and 0.5 Ω respectively if the voltage at the supply end is maintained at 11 kV. Calculate the received end voltage and efficiency of line.

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The power input to a 500V 50Hz 6Pole 3 phase induction motor running at 975 rpm is 40 kW. The stator losses are 1kW and friction and windage losses are 2kW. Calculate: (i) Slip (ii) Rotor copper loss (iii) Shaft power (iv) Efficiency

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State Thevenin’s theorem and give a proof. Apply this theorem to calculate the current through a resistor.

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A 3 φ I.M. has synchronous speed of 250rpm and 4% slip at full load. The rotor has a resistance of 0.02Ω/ph and stand still reactance of 0.15Ω/ph. Calculate i) The speed at which max torque is developed. ii) The ratio of maximum to F. L. torque. iii) The ratio of maximum to starting torque.

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How does a class D amplifier achieve high efficiency?

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