2014-15 Sem 2_Mid-term - ENGG1203 Introduction to...

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SOLUTION ENGG1203: Introduction to Electrical and Electronic Engineering Second Semester, 2014–15 March 20, 2015 Midterm Name: University Number: This midterm consists of 3 questions , altogether for 50 marks . Check that you have all 8 pages. You have 50 minutes to finish the midterm. Good luck! Question 1 Short Questions [32 pts] For the following multiple choice questions, you will earn 4 points for each correct answer, and lose 1 point for each answer that is wrong. You will not be deducted any mark if you leave an answer blank. 1. Which of the following is equivalent to ( x y ) z ? A. ( xy + xy ) z B. ( x y ) z + ( x y ) z C. ( x y + xy ) z + ( xy + x y ) z D. x yz + xyz + xy z + x y z E. xyz + x y z + xy z + x yz Ans: D 2. How does closing the switch (which connects the lamp to the rest of the circuit) affect v o and i o ? + - 5 V 2 kΩ i o 1 kΩ + - v o A. v o decreases, i o decreases B. v o decreases, i o increases C. v o increases, i o decreases D. v o increases, i o increases E. Could be any of the above, depending on lamp resistance Ans: B
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SOLUTION ENGG1203– Midterm University Number: 3. A Karnaugh map for an output involving four inputs, A , B , C , and D , is given below: 00 01 11 10 10 11 01 00 AB CD 0 1 1 0 1 0 1 1 1 1 0 1 0 0 0 0 Which of the following is a possible expression for the output? A. AB C + AB D + A BC + B D B. B D + AB C + ABC + A BD C. B D + AB C + A BC + AB D D. A B D + B D + AB C + ABC E. AD + ABC + A BC Ans: B 4. What is the output of this circuit? - + R R v 1 R v 2 R v o 5. For the circuit below, (a) is a typical buffer, where the output V o is equal to the input, V i . What will happen if you connect two additional resistors with resistance R 1 and R 2 , as shown in (b)? - + V i V o - + R 1 R 2 V i V o (a) (b) Page 2 of 8
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SOLUTION ENGG1203– Midterm University Number: A. V o = V i B. V o > V i C. V o < V i D. V o > V i if R 1 > R 2 , and V o < V i if R 1 < R 2 E. V o < V i if R 1 > R 2 , and V o > V i if R 1 < R 2 Ans: A
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