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Refer to the circuit shown in Fig. 11.78.
(a) What is the power factor?
(b) What is the average power dissipated?
(c) What is the value of the capacitance that will give a unity power factor when connected to the load?
A 2000kW synchronous motor operates at a three - phase line-to-line voltage of 4kV. It has a synchronous reactance of 4 ohms per phase. Calculate a) The nominal full load current of the machine when the excitation voltage E0 ( line - to-line) is 4k..
a 400v induction motor runs with slip 3% and consumes 5800w from the supply. it the stator losses equal 500w and the mechanical losses are 100w. calculate the output power of the motor
A base stationcellular communicationsystems lossless antenna has a maximum gain of 16 dB (above isotropic) at 1,900 MHz. Assuming the input power to the antenna is 8 watts, what is the maximum radiated power density (in watts/cm^2)
An electric ventricular assist device (EVAD) that helps pump blood concurrently to a defective natural heart in sick patients can be shown to have a transfer function G(s) = Pao(s)/Em(s) =1361/ s2 + 69s + 70.85 The input, Em(s) is the motor's armatur..
The following test data were obtained from short-circuit and open circuit tests of a 5-kVA, 2400-600V, 60Hz transformer. Voc=600V Ioc=3.34A Poc=484W Vsc=76.4V Isc=20.8A Psc=754W
The standing-wave ratio on a lossless 300transmission line terminated in anunknown load impedance is 2.5, and the nearest voltage minimum isat a distance 0.2λ from the load. Determine: a. the reflection coefficient of the load,
The air conditioner in a house or a car has a cooler that brings atmospheric air from 30 degree c to 10 degree c both states at 101 kPa. if the flow rate is 0.5 kg/s find the rate of heat transfer.
The discrete-time signal x[n] is actually the result of sampling a periodic continuous signal x(t). The signal x[n] is 1 from -12 to +12, zero from n = 13 to 87 and then it repeats. What is the positive frequency (in hz) of the Null Bandwidth
A circuit connected in series contains a voltage source of 20 V, a 5 ohm resistor, and a variable resistor, R.
Write a project specification for project - fire alarm system and the specification must cover the cost, timescales
Step-down transformer
A beverage can with a diameter of 65 mm and a height of 120 mm has a uniform temperature of 5°C when it is removed from the refrigerator. The can is set on a table in a room with an ambient air temperature of 32°C and a relative humidity of 75%. E..
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