Subject: I.T Time Allowed: 02:30 Hours University of Sargodha ADP 1" Term Examination 2024
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Subject: I.T
Time Allowed: 02:30 Hours
University of Sargodha
ADP 1" Term Examination 2024
Paper: Basic Electronics (PHYS-101)
Maximum Marks: 60
Note: Objective part is compulsory. Attempt any four questions from subjective part.
Objective Part
(Compulsory)
Q.1. Write short answers of the following in 2-3 lines of each on your answer sheet.
(2*12)
i.
iii.
iv.
V.
vi.
vii.
viii.
ix.
x.
Why equivalent capacitance is less than individual capacitance in the series combination?
ii. How does diode act as a switch?
Why is silicon preferred over germanium in the manufacture of semiconductor devices?
Differentiate between Amplitude and frequency modulation.
Briefly explain the Photodiode.
Define working principal of light emitting diode.
Criticize this statement " if X, > X, then we must have L>-"
What is voltage divider rule?
Write working principal of solar cell.
In NPN silicon transistor, a = 0.995, Ig = 10 mA and leakage current Ico = 0.5 MA. Determine
-CEO•
Xi.
We desire to make an LC circuit that oscillates at 100 Hz using and inductance of 2.5 H. What will
be the capacitance?
Xii.
Define dark current.
Subjective Part (4*9)
Q.2.
(a) What are different methods of biasing? Discuss volage divider bias.
(b) Find the a rating of the transistor shown in Figure. Hence determine the value of Ic using both
a andß rating of the transistor.
(4)
Q.3.
฿ - 49
+'к= 12 mA
(a) Explain the working of Transducers. Discuss its types in detail.
(b) Each of the resistors in the diagram has a resistance of 12 S2. Find the total resistance.
(5)
(4)
Q.4.
(a) Discuss the important properties of paramagnetic, diamagnetic, and ferromagnetic materials.
(b) A step-up transformer with 1: 10 ratio is connected to 22 V, 50 Hz AC supply mains.
(i) How
much is secondary voltage?
(ii) If secondary load is 100 ohms, what is the secondary current, and
Q.5.
primary current? Assume 100% efficiency.
(5+4)
What is the difference between intrinsic and extrinsic semi-conductor materials? Explain the role
of doping of an impurity in a semi-conductor material.
(9)
Q.6.
Discuss the working of LED. What are the major factors that influence the brightness of the emitted
light?? What will be the effect when it is reverse biased?
(9)
Q.7.
(a) What is voltage multiplier? Discuss working of half wave voltage doubler.
(5)
(b) Draw transistor circuit configuration and determine the relation between a and B.
(4)
-- LK-6112/03-05-24