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A 100 kVA 2000/400 V, 50 Hz single-phase transformer gave the following test results:With 2000 V applied to the primary with the secondary on open circuit:current 2 A, power 1400 WWith the secondary short-circuited and 112 V applied to the primary full-load current circulated in the primary with the input power 1600 W.
Draw an equivalent circuit referred to the secondary side and insert all values of resistance and reactance.
A PV system using battery charger can provide the necessary power when there is no sun. The manufacturer has provided following parameters (All measurements are done at standard condition of AM1.5 G spectrum) of an Indi dual solar cell.
The motor resistance is 0.5ohm and the magnetic circuit may be assumed unsaturated. What will be the speed if: (i) the load torque is increased by 44%, (ii) the motor current is 10A
A three phase synchronous motor has the synchronous reactance of 2.1 Ohm and draws 250 A with a lagging power factor for an excitation voltage of 1327 -15 degree per phase. Find the terminal voltage of the motor and power factor of the motor.
To prevent this, a device is placed across the solenoid (inductor) that can hold the voltage to a safe value, say 40V, during transients. If the activating current in the solenoid is 1 amp and its inductance is 100uH
A series of combination having R=2Mohm and C=0.01 UF is connected across a D.C. voltage source of 50V. Determined capacitor voltage and charging current after 0.02s, 0.04s and 1 hour.
A circuit contains a known resistance of 2.4 kO, and an unknown inductance. a) When a 12-V battery is connected, what is the current in the circuit a long time after the switch is closed
A composite analog signal is given in the following expression: x(t)=1.2 sin(2pi60ft)+0.0001cos(2pi1ft) -If this signal was sampled at 1000 Hz, derive the expression for the sampled sequence x[n] with n being the sampling index.
An adiabatic piston cylinder contains 1 kg of R-134a. Initially the conditions inside the piston are 200 kPa and 0 degrees C. An electric heater inside the device runs with constant voltage of 110 V and a constant 0.1A of current for one hour
design the controller and estimator so that the closed-loop unit step response to a command input has a rise time tr
The read arm of a computer disk drive has the transfer function of G(s) = 1000/s^2. Design a digital controller that has a bandwidth of 100 Hz and a phase margin of 50 degrees. Use a sample rate of 6kHz.
Multiple charges at different locations are said to be in equilibrium if the force acting on any one of them is identical in magnitude and direction to the force acting on any of the others. Suppose we have two negative charges
The transfer function (TF) of a system is given below. Find its impulse response inn domain. Hint: First multiply the TF by the z-transform of input-or x(z)-or the z-transform of unit impulse. Factor the denominator and then expand.
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