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Ics2100:Electronics Question Paper

Ics2100:Electronics

Course:Bachelor Of Information Technology

Institution: Meru University Of Science And Technology question papers

Exam Year:2011

1
(a) Differentiate between (i) P-type and n-type semiconductors (4 Marks) (ii) Majority and minority carriers. (4 Marks) (b) State three uses of zener diode. (3 Marks) (c) A transistor has a collector current of 2mA. If the current gain is 135. Calculate the base current. (4 Marks) (d) Show that the gain of an inverting amplifier is given by ???? = -Rf R1 where Rf is the feedback resistance. (5 Marks) (e) Explain the role of doping in semi conductors. (5 Marks) (f) Define the following terms: (i) P-N Junction (3 Marks) (ii) Doping (2 Marks)
QUESTION TWO – (20 MARKS)
(a) State two types of transistors. (2 Marks) (b) Sketch and explain a JFET drain characteristic with VGS = 0 10 Marks) (c) A transistor has a collector current of 10mA and a base current of 40????. Calculate the current gain of the transistor. (4 Marks) (d) State the factors that should be put into consideration when biasing a transistor. (4 Marks)
2
QUESTION THREE – (20 MARKS)
(a) In relation to OP-AMPs define the following terms: (i) Transistor frequency (2 Marks) (ii) Output impedance (2 Marks) (b) Draw a circuit showing how an OP-AMP can be used as (i) Summer (4 Marks) (ii) Inverter (4 Marks) (c) With the aid of a circuit diagram, explain common-emitter (CE) configuration in BJTs and hence show that IE = (1 + ß)IB (8 Marks)
QUESTION FOUR – (20 MARKS)
(a) How does conductivity of a semi conductor change with rise in temperature? (5 Marks) (b) With the aid of circuit diagram, differentiate between a forward and reverse biased diode (10 Marks) (c) Define the following terms (i) Zener diode (3 Marks) (ii) Drain terminal (2 Marks)

Ics2100:Electronics Question Paper

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