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Physics

Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 1: Intrinsic and Doped Semiconductors, the p-n Junction and Transistors — Picture questions (exam style)

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  • Questions count: 7
  • Passing grade: 60%
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1.
Which statement is NOT correct? (see figure)
Which statement is NOT correct? (see figure)
collector current is much larger than base current
donor atoms are pentavalent
acceptor atoms are pentavalent
reverse bias widens the depletion region
2.
Which lamp(s) light in the circuit shown?
Which lamp(s) light in the circuit shown?
L₂ only
both L₁ and L₂
neither
L₁ only
3.
A 12 V peak, 50 Hz supply feeds a full-wave bridge rectifier with load 2200 Ω as shown; each diode drops 0.7 V. Find the peak load current.
A 12 V peak, 50 Hz supply feeds a full-wave bridge rectifier with load 2200 Ω as shown; each diode drops 0.7 V. Find the peak load current.
4.82 mA
3.41 mA
5.45 mA
5.14 mA
4.
An npn transistor in the common-emitter circuit shown: β = 80, I_B = 50 μA, R_C = 500 Ω, V_CC = 12 V. Which option is correct?
An npn transistor in the common-emitter circuit shown: β = 80, I_B = 50 μA, R_C = 500 Ω, V_CC = 12 V. Which option is correct?
I_C = 0.000625 mA, V_CE = 10 V, α = 0.9877
I_C = 4 mA, V_CE = 10 V, α = 0.9877
I_C = 4 mA, V_CE = 12 V, α = 1.0125
I_C = 4 mA, V_CE = 14 V, α = 0.9877
5.
In the circuit, E = 12 V (no internal resistance) and each diode has forward voltage 0 V. Find the current from the battery.
In the circuit, E = 12 V (no internal resistance) and each diode has forward voltage 0 V. Find the current from the battery.
180 mA
40.0 mA
60.0 mA
104 mA
6.
A 15 V peak, 50 Hz supply feeds a half-wave rectifier with load 2200 Ω as shown; each diode drops 0 V. What is the ripple (pulse) frequency across the load?
A 15 V peak, 50 Hz supply feeds a half-wave rectifier with load 2200 Ω as shown; each diode drops 0 V. What is the ripple (pulse) frequency across the load?
50.0 Hz
200 Hz
100 Hz
25.0 Hz
7.
An npn transistor in the common-emitter circuit shown: β = 150, I_B = 40 μA, R_C = 1000 Ω, V_CC = 15 V. Which option is correct?
An npn transistor in the common-emitter circuit shown: β = 150, I_B = 40 μA, R_C = 1000 Ω, V_CC = 15 V. Which option is correct?
I_C = 6 mA, V_CE = 9 V, α = 0.9934
I_C = 0.000267 mA, V_CE = 15 V, α = 1.0067
I_C = 6 mA, V_CE = 15 V, α = 0.9934
I_C = 0.6 mA, V_CE = 21 V, α = 0.9934
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