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A four_pole 60Hz 240-V-rms induction motor operates at 1750 rpm and produces 2 hp of output power. The load is hoist that requires constant torque versus speed. Assume that the motor is operating in the range for which torque is proportional to slip and write an equation for motor torque in terms of slip when operating at rated voltage. Then modify the equation for operation from a 220-V-rms source. Estimate the speed when operating the hoist from a 220-V-rms source.
A 10kVA, 200/400V 50Hz single-phase transformer gave the following test results. O/C test: 200V, 1.3A, 120W, on l.v. side. S/C test: 22V, 30A, 200W on h.v. side. (a) Calculate the magnetizing current and the component corresponding to core loss
Open Neutral Assume that the load is star connected with the neutral disconnected. Each phase has a series RL load with R = 5 ohms and L = 20 mH. Plot the neutral voltage Plot the phase to neutral voltage for phase a.
A piston-cylinder device contains carbon dioxide CO2 (molar mass = 46 g/mol) as shown in the figure. The cross-section area of the piston is 0.25 m2 and the initial cylinder height is 50 cm. CO2 is initially at 40 bar and 500 oC (state 1).
A measurement of the rate at which a capacitor will store a charge on its plates is called The opposition to the flow of current which results in the continual interchange of energy between source and magnetic field is known as
Which elements in the circuit are in parallel. what is the relationship between Va and Vb. Given that Va= 12V and V= 7V, determine the values of Vb and Vd.
What is the common-mode rejection ratio (in dB) if the output voltage is measured to be 2.0 Vp-p when the input terminals are connected together and a 0.1 Vp-p voltage is applied between the inputs and ground.
a digital signal represented by a binary voltage +5.55 and -4.5V , is transmitted over an AWGN channel with noise standard dev 1.12 V.Compute the volt. f the optimum thresholdwhen the priori probabilities of the binary source
An analog AMPS cell phone channel at 900MHz carrier has a carrier amplitude of 4V and is a modulation signal m(t)=Bmsin(10000*pi*t). The amplitude of the modulating signal is 2V and the peak frequency deviation was found to be 10kHz
A 480 V permanent magnet ae motor is consuming 10 kW at power factor 0.80 lagging. Its speed is 1800 rpm. The winding resistance is 0.5 W per phase. Core losses are 100 W. Mechanical losses arc 250 W.
Assume the resistance of a human person was 500 ohms, if a person was struck by lightning with a peak voltage of 100,000 volts, what was the peak current that would flow through the person
Describe in you own words how a modem works and what steps the data goes through to be sent from one terminal to another via modem.
if the equation for a mesh current is done and the current comes out negative, with the assumed clockwise direction. does that mean that the current is actually going in the opposite direction
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