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Q1 A factory load consists of the following :
(i) an induction motor of 50 H.P. (37.3 kW) with 0.8 pf and efficiency 0.85.
(ii) a synchronous motor of 25 H.P. (18.65 kW) with 0.9 pf leading and efficiency 0.9.
(iii) lighting load of 10 kW at unity pf.
Find the annual electrical charges if the tariff is Rs 60 per kVA of maximum demand per annum plus 5 paise per kWh ; assuming the load to be steady for 2000 hours in a year.
Q2 A supply system feeds the following loads (i) a lighting load of 500 kW
(ii) a load of 400 kW at a pf of 0.707 lagging
(iii) a load of 800 kW at a pf of 0.8 leading
(iv) a load of 500 kW at a pf. 0.6 lagging
(v) a synchronous motor driving a 540 kW d.c. generator and having an overall efficiency of 90%. Calculate the power factor of synchronous motor so that the station power factor may become unity.
the bridge circuit is energized from a 21 V dc source. the bridge is balanced when R1 = 800Ω, R2 =1200Ω, and R3 = 600Ω. a) what is the value of Rx b) how much current(in milliamperes) does the dc source supply
A 208-V Y connected three phase synchronous motor has a synchronous reactance of 4O per phase and negligible armature winding resistance. At a certain load the motor take 7.2kW at 0.8 pf lagging.
Draw the phasor diagram of the voltages E, VR, and VL, and the current I. - Verify Kirchhoff's voltage law around the closed loop. - Find the average power delivered to the circuit.
determine the maximum and minimum spectral frequencies received from a stationary gsm transmitter that has a center
Determine the transfer function for a first order low pass filter with a cutoff frequency of 1000 radians/sec (note radians and not Hertz) and a pass band gain of 1 using the following types.(a) Butterworth type(b) Chebyschev type
The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils
Plot the magnitude response (in dB) and the impulse response of the designed filter using MatLab.
4. consider a three slab geometry where each slab carries a uniform charge density and has equal width w in the z
1.5V battery. Design a voltage divider to provide a voltage that is approximately 1/3 of the battery voltage. Use resistances in the kilo ohms range. Redesign your divider so that the resistors are in Mega ohms range.
A constellation diagram has four points located at (2,2), (-2,2), (-2, -2), and (2, -2) on the I(in-phase)-Q(quadrature phase) plane. Find the value of peak amplitude and the type of modulation this diagram represents.
A sheet of plywood 1.39 cm thick is used to make a cabinet door 55.5 cm wide by 69.5 cm tall, with hinges mounted on the vertical edge. A small 181-g handle is mounted 45 cm from the lower hinge at the same height as that hinge.
In addition, the stopbandattenuation is to be at least 65 dB, starting at the Nyquistfrequency of 22.05 kHz. The complexity of the filter shouldbe minimized. Sketch the filter specification (amplitude vs.frequency). Which filter family would you e..
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