Problem 1: A buck converter 300V (input) dc source has a load time constant of 4ms and load resistance of 10 Ω operating at 4 kHz from, For a load voltage of 150V, Calculate the minimum and maximum valued of load current.
A) 14.76A, 15.23A
B) 13.44A, 17.22A
C) 14.87A, 16.12A
D) 13.44A, 15.11A
Problem 2: A PMMC type instrument having a resistance of 5 ohm working current 10mA, is to be used with a shunt to measure 50A. The temperature coefficient of managing and copper are 0.15 milliohm/ohm/oC and 4 milliohm/ohm/oC. Find out the error in measurement of current in meter caused by 20oC temperature rise.
Problem 3: Find the Laplace transform of the following Fig.
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