Saturday, March 22, 2014

Video Solutions on Electronics (EDC) from GATE 1993 ECE

1. The wave shape of Vo in the figure will be
Answer:A

Solution : https://www.youtube.com/watch?v=cf2BGUVVFDQ


2. In the figure, the ideal moving iron voltmeter M will read
Answer:B

Solution : https://www.youtube.com/watch?v=5bK9WaHVqaM


3. M in the figure shown is a rectifier type 200 volts full scale voltmeter having a sensitivity of 10 KΩ/volt. What will be the reading in M if the source voltage VS is a symmetrical square wave of 800 volts peak to peak ?
Answer:

Solution :


4. In the figure, A1, A2 and A3 are ideal ammeters. If A1 reads 5 Amps, A2 reads 12 Amps then A3 should read……..
Answer:C

Solution : https://www.youtube.com/watch?v=rSXdcnxQ3MA



5. The built in potential (Diffusion potential) in a PN junction………
a. Is equal to the difference in the Fermi level of the two sides, expressed in volts
b. Increases with the increase in the doping levels of the two sides
c. Increases with the increase in temperature
d. Is equal to the average of the Fermi levels of the two sides
Answer:A & B

Solution : https://www.youtube.com/watch?v=h9awFNgU-o8


6. Consider the circuit shown in figure (a). if the diode used here has the V-I characteristics as shown in figure (b), then the output waveform Vo is ………

Answer:D

Solution : https://www.youtube.com/watch?v=B1fq6qREH9A


7. The reverse saturation current of the collector base junction (ICBO) of a BJT is found to be 10 nA at low collector voltages. The low current amplification factor (α) is 0.98. Find out the change in collector current with its base open (ICEO) when the collector voltage is increased such that α increases by the 1 %.
Answer: 96%

Solution : https://www.youtube.com/watch?v=g12aSRc8DW4

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