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Q. The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load current at 0.8 power factor, and 99.13%with half rated current at unity power factor. Calculate:
(a) The iron loss.
(b) The full-load copper loss.
(c) The efficiency at 3/4 load, 0.9 power factor
what is digital frequency metre?working principle its operation and types application,advantages ,disadvantages
OBJECTIVES Use an NXT to control the speed of a DC fan motor. You will us a potentiometer to set the speed and the second fan motor as feedback. Use the circuit from Lab 1 to
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The field resistance of a dc machine is 50 ohm at 20 o C. The resistance increases to 55 ohm at 50 o C. Find the temperature coefficient of the resistance material. Ans: Sol
For the amplifier circuit shown below estimate the mid band voltage gain if the EARLY voltage (V A ) of the current mirror transistors is 80 volts. Assume the d.c biasing is optim
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Q. What is Enhancement MOSFETS? Figure illustrates the cross-sectional structure of an n-channel enhancement MOSFET and its symbol showing as a normally off device when used fo
Hydraulic analogy
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