UChicago CMSC 23320 - The Best Commit Messages of 2024
S 2 question paper
1. Departmentof Physics
COMSATS Institute of Information Technology Lahore
Sessional II Examination –SP 2021
Course Title: Electronics Course Code: Phy 234 Credit Hours: 3
Course Instructor/s:Dr. M. Yasir Rafique Program Name: BS Physics
Semester: 5th Batch: Sp-19-BPH Section: B Date: 07-05-2021
Time Allowed: 1 h and 30 min Maximum Marks: 20
Student’s Name: Reg. No.
Important Instructions / Guidelines:
• Solve all parts of Question at one place (specially question 1)
• Student should submit their solved exam answers sheet (pdf) on cuonline (preferably,)
• In case of un-successful uploadingon cuonline,studentcan email to
me at myasir.rafique@cuilahore.edu.pk
For email follow these instructions strictly
a-Write your name and registration in “subject” as shown below
“Final-term exam- FA19-004-SUMREEN FATIMA-A”
b-Re-Name the answer sheet pdf file with your reg. no. + name + group. e-g as shown below
FA19-004-SUMREEN FATIMA-A.pdf
Q 1 Short Question [7]
(a) Explain the purpose of a thin, lightlydoped base region in BJT. (1)
(b) For normal operation of a pnp transistor,the base must be (+ or -) with respect to the emitter,
and (+ or -) with respect to the collector. (1)
(c) What are different operatingregions of BJT? illustrate them on load line and describe
junctions (BE junction and BC junction) conditions for each region (2)
(d) What is Q-point and why it is selectedabout midpoint of DC load line for linear amplifier?
What are limitationand consequences if Q point is not midpoint? (2)
(e) Why the Q point in Base Bias (fixedbias) is not stable (1)
Question 2 [3]
(a) The output (collector voltage) of a biased transistor amplifier is shown in below figure. Is
the transistor biased too close to cutoff or too close to saturation? (1)
(b) Draw dc load line for BJT under different VCC and collector resistor (RC) values. (2)
2. Question 3
Determine the Q-point value of IC and VCE , IC(sat) and VCE(off) of followingcircuit. Determine
whether its Q-point is stable or not. [8]
(a) (b)
Q 4:
[2]
A certain transistor is to be operated at a collector current of 50 mA. How high can VCE go
without exceeding a PD(max) of 1.2 W?
![Departmentof Physics
COMSATS Institute of Information Technology Lahore
Sessional II Examination –SP 2021
Course Title: Electronics Course Code: Phy 234 Credit Hours: 3
Course Instructor/s:Dr. M. Yasir Rafique Program Name: BS Physics
Semester: 5th Batch: Sp-19-BPH Section: B Date: 07-05-2021
Time Allowed: 1 h and 30 min Maximum Marks: 20
Student’s Name: Reg. No.
Important Instructions / Guidelines:
• Solve all parts of Question at one place (specially question 1)
• Student should submit their solved exam answers sheet (pdf) on cuonline (preferably,)
• In case of un-successful uploadingon cuonline,studentcan email to
me at myasir.rafique@cuilahore.edu.pk
For email follow these instructions strictly
a-Write your name and registration in “subject” as shown below
“Final-term exam- FA19-004-SUMREEN FATIMA-A”
b-Re-Name the answer sheet pdf file with your reg. no. + name + group. e-g as shown below
FA19-004-SUMREEN FATIMA-A.pdf
Q 1 Short Question [7]
(a) Explain the purpose of a thin, lightlydoped base region in BJT. (1)
(b) For normal operation of a pnp transistor,the base must be (+ or -) with respect to the emitter,
and (+ or -) with respect to the collector. (1)
(c) What are different operatingregions of BJT? illustrate them on load line and describe
junctions (BE junction and BC junction) conditions for each region (2)
(d) What is Q-point and why it is selectedabout midpoint of DC load line for linear amplifier?
What are limitationand consequences if Q point is not midpoint? (2)
(e) Why the Q point in Base Bias (fixedbias) is not stable (1)
Question 2 [3]
(a) The output (collector voltage) of a biased transistor amplifier is shown in below figure. Is
the transistor biased too close to cutoff or too close to saturation? (1)
(b) Draw dc load line for BJT under different VCC and collector resistor (RC) values. (2)](https://image.slidesharecdn.com/s-2questionpaper-211024065723/85/S-2-question-paper-1-320.jpg)
![Question 3
Determine the Q-point value of IC and VCE , IC(sat) and VCE(off) of followingcircuit. Determine
whether its Q-point is stable or not. [8]
(a) (b)
Q 4:
[2]
A certain transistor is to be operated at a collector current of 50 mA. How high can VCE go
without exceeding a PD(max) of 1.2 W?](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)