Examination 1
Spring 2020
ECEN 3250
Name: ____________________________________________
Instructions: This is a 50 minute in-class exam. The exam is closed book. You may use one page
crib sheet. You may use a handheld calculator. You are on your honor not to consult with other
people. Show all work: partial credit will be given, but no credit will be given for answers without
supporting steps and derivations. Please write your name above, sign the honor code statement
below (you must sign to receive credit for this exam), and return this cover sheet with your exam.
On my honor as a University of Colorado at Boulder student, I have neither given nor received
unauthorized assistance on this midterm exam.
Signed: __________________________________________
Date: ____________________________________________
This exam contains three problems and seven pages.
1 _____________
2 _____________
3 _____________
, 1. (50 points) Assume the diodes to be ideal in the circuit of Fig. 1.
Figure 1: Diode circuit of Problem 1.
a. (15 points) Let R1 = 1 kΩ
i. Is D1 on or off?
ii. Is D2 on or off?
iii. What is the value of Va?
Spring 2020
ECEN 3250
Name: ____________________________________________
Instructions: This is a 50 minute in-class exam. The exam is closed book. You may use one page
crib sheet. You may use a handheld calculator. You are on your honor not to consult with other
people. Show all work: partial credit will be given, but no credit will be given for answers without
supporting steps and derivations. Please write your name above, sign the honor code statement
below (you must sign to receive credit for this exam), and return this cover sheet with your exam.
On my honor as a University of Colorado at Boulder student, I have neither given nor received
unauthorized assistance on this midterm exam.
Signed: __________________________________________
Date: ____________________________________________
This exam contains three problems and seven pages.
1 _____________
2 _____________
3 _____________
, 1. (50 points) Assume the diodes to be ideal in the circuit of Fig. 1.
Figure 1: Diode circuit of Problem 1.
a. (15 points) Let R1 = 1 kΩ
i. Is D1 on or off?
ii. Is D2 on or off?
iii. What is the value of Va?
