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An electric kettle needs six minutes to boil 2 kg of water from the initial temperature of 20"C. The cost of electrical energy required for operation is 12 paise, the rate being 40 paise per kWh. Find the kW-ruling and the overall efficiency of rate the kettle.
An assembly line can produce 90 units per hr. The line hrly cost is $4500 on stright line ( the first 8 hrs). Workers are guaranteed a minimum of 6 hrs. There is a 50% premiun for overtime (time and a half), how ever productivity drops by 5%.
The instantaneous power p into a one port containing resistors and inductors has maximum value 100(1+sqrt2) W and minimum value 100(1-sqrt2)W. (note that instantaneous power is measured in W, and it contains various contributions
Using a voltage source Vdd=2.5V and an MOSFET with Vt=0.5 V, Kn'=0.8 A/V^2, W=10um and lambda=0, build a common source amplifier which drives a load resistor of 10k ohms. The input signal to the amplifier is a sine wave with a peak value of 0.15 V..
Find the heat energy generated by this amplifier. Assuming the BJT power transistor has a maximum junction temperature of 155 0C, if the ambient temperature is 25 0C, find the maximum allowable thermal resistance from the junction to ambient.
An analog signal xa(t), band-limited to 5 Hz, is sampled at a rate of 10 samples per second to give a discrete-time signal x(n) = xa(0.1n). The discrete-time signal x(n) is then filtered with an digital FIR filter, h.
An LVDT (Linear Variable Differential Transformer) is used in an accelerometer to measure seismic-mass displacement. The LVDT and signal-conditioning output is 0.31 mV/mm with a +/- 2 cm maximum core displacement.
Design your circuit so that the STOP push button must be pressed before the motor can be switched direction Also incorporated a 5 second delay to inhibit restart after the STOP push button has been pressed Green light
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
(a) What is the acceleration of an electron in a uniform electric field of 1.0x106 N/C (b) How long would it take for the electron, starting from rest, to attain one-tenth the speed of light. Assume that Newtonian mechanics holds.
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 transformer has a primary voltage of 115v and a secondary voltage of 24v. If the number of turns in the primary is 345, how many turns are in the secondary?
A quantum well has a finite-height barrier on one side and an infinitely high barrier on the other. Find the energies for the two lowest states for an electron in the well. The width of the well is L = 1 nm and the height of the finite step is Uo ..
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