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Saturday, 10 March 2018

ECE226 : Analog Circuits And Electronics Devices Practices MCQ Questions for MTE & ETE Exam - ECE 226 - Lpu Question Paper


1. How many terminals does a diode have?
A) 1
B) 2
C) 3
D) 4

2. What is the resistor value of an ideal diode in the region of conduction?
A) 0
B) 5 k
C) Undefined
D) Infinity

3. What is the state of an ideal diode in the region of nonconduction?
A) An open circuit
B) A short circuit
C) Unpredictable
D) Undefined

4.The diode _____.
A) is the simplest of semiconductor devices
B) has characteristics that closely match those of a simple switch
C) is a two-terminal device
D) All of the above

5.The ideal diode is a(n) _____ circuit in the region of nonconduction.
A) open
B) short

6.Which of the following is an atom composed of?
A) Electrons
B) Protons
C) Neutrons
D) All of the above

7. How many orbiting electrons does the germanium atom have?
A) 4
B) 14
C) 32
D) 41

8.How many valence electrons does a silicon atom have?
A) 1
B) 2
C) 3
D) 4

9.One eV is equal to _____ J.
A) 6.02 × 1023
B) 1.6 × 10–19
C) 6.25 × 1018
D) 1.66 × 10–24

10. Which of the following elements is most frequently used for doping pure Ge or Si?
A) Boron
B) Gallium
C) Indium
D) All of the above

11.The diffused impurities with _____ valence electrons are called donor atoms.
A) 4
B) 3
C) 5
D) 0

12.In what state is a silicon diode if the voltage drop across it is about 0.7 V?
A) No bias
B) Forward bias
C) Reverse bias
D) Zener region

13.What unit is used to represent the level of a diode forward current IF?
A) pA
B) nA
C) A
D) mA

14.Which of the following ratings is true?
A) Si diodes have higher PIV and narrower temperature ranges than Ge diodes.
B) Si diodes have higher PIV and wider temperature ranges than Ge diodes.
C) Si diodes have lower PIV and narrower temperature ranges than Ge diodes.
D) Si diodes have lower PIV and wider temperature ranges than Ge diodes.

15.It is not uncommon for a germanium diode with an Is in the order of 1–2 A at 25°C to have leakage current of 0.1 mA at a temperature of 100°C.
A) True
B) False

16. Calculate static resistance RD of a diode having ID = 30 mA and VD = 0.75 V.
A) 25
B) 40
C) 0.04
D) 0.025

17. Calculate ID if RD = 30 and VD = 0.84 V.
A) 28 mA
B) 0.028 mA
C) 2.8 A
D) 280 A

18. Refer to Figure 1.27. Calculate the dynamic resistance rd of a diode having ID = 27.5 mA.
A) 0
B) 2
C) 5
D) 26

19. Determining rd to a high degree of accuracy from a characteristic curve is very accurate.
A) True
B) False

20. The _____ diode model is employed most frequently in the analysis of electronic systems.
A) ideal device
B) simplified
C) piecewise-linear

21.Calculate the power dissipation of a diode having ID = 40 mA.
A) 28 mW
B) 28 W
C) 280 mW
D) Undefined

22. Which capacitance dominates in the reverse-bias region?
A) depletion
B) conversion
C) 40 Diffusion
D) 140 None of the above

23. Which capacitance dominates in the forward-bias region?
A) Diffusion
B) Transition
C) Depletion
D) None of the above

24. At what kind of operating frequency diffusion or transition is a capacitor represented in parallel with the ideal diode?
A) Low frequency
B) Moderate frequency
C) Mid frequency
D) Very high frequency

25. What does a high resistance reading in both forward- and reverse-bias directions indicate?
A) A good diode
B) An open diode
C) A shorted diode
D) A defective ohmmeter

26. The condition of a semiconductor diode can be determined quickly using a _____.
A) DDM
B) VOM
C) curve tracer
D) Any of the above

27. Determine the nominal voltage for the Zener diode at a temperature of 120° C if the nominal voltage is 5.1 volts at 25° C and the temperature coefficient is 0.05%/° C.
A) 4.6 V
B) 4.86 V
C) 5.1 V
D) 5.34 V

28. Calculate the temperature coefficient in %/° C of a 10-V nominal Zener diode at 25° C if the nominal voltage is 10.2 V at 100° C.
A) 0.0238
B) 0.0251
C) 0.0267
D) 0.0321

29. In which of the following color(s) is (are) LEDs presently available?
A) Yellow
B) White
C) Orange
D) All of the above

30.What is the maximum power rating for LEDs?
A) 150 mW
B) 500 mW
C) 1 W
D) 10 W

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