Practice high-yield Electrical Engineering MCQs on Transistors — Part 2 with worked academic solutions for WAPDA, NTDC, IESCO, LESCO, PPSC, FPSC.
Questions
40
Difficulty Level
Exam-Level
Target Exams
WAPDA, NTDC, IESCO...
Estimated Time
48 mins
Exam-Level WAPDA NTDC IESCO LESCO PPSC FPSC
Verified for Commission Syllabus • Oct 14, 2026
40
Verified Practice Questions
Interactive test mode with detailed academic worked solutions
Live Progress|0/40 answered
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🎉 Set complete! All 40 questions answered.
Question 1 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The leakage current in CE arrangement is ___________ that in CB arrangement
Correct Answer: Option A — more than
Detailed Academic Explanation:
more than is the correct answer to “The leakage current in CE arrangement is ___________ that in CB arrangement”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 2 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The arrow in the symbol of a transistor indicates the direction of ___________
Correct Answer: Option C — hole current in the emitter
Detailed Academic Explanation:
hole current in the emitter is the correct answer to “The arrow in the symbol of a transistor indicates the direction of ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 3 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In the above question, what are the values of cut-off frequencies?
Correct Answer: Option B — 1020 kHz , 980 kHz
Detailed Academic Explanation:
1020 kHz , 980 kHz is the correct answer to “In the above question, what are the values of cut-off frequencies”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 4 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then ___________
Correct Answer: Option A — XL decreases and XC increases
Detailed Academic Explanation:
XL decreases and XC increases is the correct answer to “In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 5 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In parallel resonance, the circuit impedance is ___________.
Correct Answer: Option D — $$\frac{{\text{L}}}{{{\text{CR}}}}$$
Detailed Academic Explanation:
$$\frac{{\text{L}}}{{{\text{CR}}}}$$ is the correct answer to “In parallel resonance, the circuit impedance is ___________.”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 6 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Transistor biasing is generally provided by a ___________
Correct Answer: Option A — Biasing circuit
Detailed Academic Explanation:
Biasing circuit is the correct answer to “Transistor biasing is generally provided by a ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 7 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The value of VBE ___________
Correct Answer: Option B — Is almost independent of IC
Detailed Academic Explanation:
Is almost independent of IC is the correct answer to “The value of VBE ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 8 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
If the value of collector current IC increases, then the value of VCE ___________
Correct Answer: Option B — Decreases
Detailed Academic Explanation:
Decreases is the correct answer to “If the value of collector current IC increases, then the value of VCE ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 9 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
If the temperature increases, the value of VCE ___________
Correct Answer: Option C — Is decreased
Detailed Academic Explanation:
Is decreased is the correct answer to “If the temperature increases, the value of VCE ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 10 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Frequencies above ___________ kHz are called radio frequencies
Correct Answer: Option D — 200
Detailed Academic Explanation:
200 is the correct answer to “Frequencies above ___________ kHz are called radio frequencies”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 11 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The phase difference between the input and output voltages in a common base arrangement is ___________
Correct Answer: Option D — 0°
Detailed Academic Explanation:
0° is the correct answer to “The phase difference between the input and output voltages in a common base arrangement is ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 12 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The voltage gain of a transistor connected in common collector arrangement is ___________
Correct Answer: Option D — less than 1
Detailed Academic Explanation:
less than 1 is the correct answer to “The voltage gain of a transistor connected in common collector arrangement is ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 13 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The phase difference between the input and output voltages of a transistor connected in common collector arrangement is ___________
Correct Answer: Option A — 0°
Detailed Academic Explanation:
0° is the correct answer to “The phase difference between the input and output voltages of a transistor connected in common collector arrangement is ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 14 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The input impedance of a transistor connected in ___________ arrangement is the highest
Correct Answer: Option B — common collector
Detailed Academic Explanation:
common collector is the correct answer to “The input impedance of a transistor connected in ___________ arrangement is the highest”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 15 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The output impedance of a transistor connected in ___________ arrangement is the highest
Correct Answer: Option C — common base
Detailed Academic Explanation:
common base is the correct answer to “The output impedance of a transistor connected in ___________ arrangement is the highest”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 16 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The power gain in a transistor connected in ___________ arrangement is the highest
Correct Answer: Option A — common emitter
Detailed Academic Explanation:
common emitter is the correct answer to “The power gain in a transistor connected in ___________ arrangement is the highest”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 17 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The voltage gain in a transistor connected in ___________ arrangement is the highest
Correct Answer: Option C — common emitter
Detailed Academic Explanation:
common emitter is the correct answer to “The voltage gain in a transistor connected in ___________ arrangement is the highest”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 18 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In a transistor if ß = 100 and collector current is 10 mA, then IE is ___________
Correct Answer: Option B — 10.1 mA
Detailed Academic Explanation:
10.1 mA is the correct answer to “In a transistor if ß = 100 and collector current is 10 mA, then IE is ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 19 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The Q of a tuned amplifier is generally ___________
Correct Answer: Option C — More than 10
Detailed Academic Explanation:
More than 10 is the correct answer to “The Q of a tuned amplifier is generally ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 20 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The value of ß for a transistor is generally ___________
Correct Answer: Option C — between 20 and 500
Detailed Academic Explanation:
between 20 and 500 is the correct answer to “The value of ß for a transistor is generally ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 21 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to ___________
Correct Answer: Option C — 3 mA
Detailed Academic Explanation:
3 mA is the correct answer to “If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 22 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The purpose of resistance in the emitter circuit of a transistor amplifier is to ___________
Correct Answer: Option C — Limit the change in emitter current
Detailed Academic Explanation:
Limit the change in emitter current is the correct answer to “The purpose of resistance in the emitter circuit of a transistor amplifier is to ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 23 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
For proper amplification by a transistor circuit, the operating point should be located at the ___________ of the d.c. load line
Correct Answer: Option B — Middle
Detailed Academic Explanation:
Middle is the correct answer to “For proper amplification by a transistor circuit, the operating point should be located at the ___________ of the d.c. load line”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 24 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The leakage current in a silicon transistor is about ___________ the leakage current in a germanium transistor
Correct Answer: Option C — One thousandth
Detailed Academic Explanation:
One thousandth is the correct answer to “The leakage current in a silicon transistor is about ___________ the leakage current in a germanium transistor”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 25 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The Q of an LC circuit is given by ___________
Correct Answer: Option C — 2pfrL / R
Detailed Academic Explanation:
2pfrL / R is the correct answer to “The Q of an LC circuit is given by ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 26 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Tuned class C amplifiers are used for RF signals of ___________
Correct Answer: Option D — None of the above
Detailed Academic Explanation:
None of the above is the correct answer to “Tuned class C amplifiers are used for RF signals of ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 27 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The biasing circuit has a stability factor of 50. If due to temperature change, ICBO changes by 1 µA, then IC will change by ___________
Correct Answer: Option D — 50 µA
Detailed Academic Explanation:
50 µA is the correct answer to “The biasing circuit has a stability factor of 50. If due to temperature change, ICBO changes by 1 µA, then IC will change by ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 28 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
A silicon transistor is biased with base resistor method. If ß=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB?
Correct Answer: Option B — 530 kΩ
Detailed Academic Explanation:
530 kΩ is the correct answer to “A silicon transistor is biased with base resistor method. If ß=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 29 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In a npn transistor, ___________ are the minority carriers
Correct Answer: Option B — holes
Detailed Academic Explanation:
holes is the correct answer to “In a npn transistor, ___________ are the minority carriers”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 30 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
ICEO = () ICBO
Correct Answer: Option C — 1 + ß
Detailed Academic Explanation:
1 + ß is the correct answer to “ICEO = () ICBO”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 31 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In a pnp transistor, the current carriers are ___________
Correct Answer: Option D — holes
Detailed Academic Explanation:
holes is the correct answer to “In a pnp transistor, the current carriers are ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 32 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The base of a transistor is ___________ doped
Correct Answer: Option C — lightly
Detailed Academic Explanation:
lightly is the correct answer to “The base of a transistor is ___________ doped”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 33 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The collector of a transistor is ___________ doped
Correct Answer: Option B — moderately
Detailed Academic Explanation:
moderately is the correct answer to “The collector of a transistor is ___________ doped”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 34 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The emitter of a transistor is ___________ doped
Correct Answer: Option B — heavily
Detailed Academic Explanation:
heavily is the correct answer to “The emitter of a transistor is ___________ doped”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 35 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The base resistor method is generally used in
Correct Answer: Option B — Switching circuits
Detailed Academic Explanation:
Switching circuits is the correct answer to “The base resistor method is generally used in”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 36 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 kΩ, what is the value of RE ?
Correct Answer: Option C — 800 Ω
Detailed Academic Explanation:
800 Ω is the correct answer to “In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 kΩ, what is the value of RE”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 37 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The number of depletion layers in a transistor is ___________
Correct Answer: Option D — two
Detailed Academic Explanation:
two is the correct answer to “The number of depletion layers in a transistor is ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 38 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The element that has the biggest size in a transistor is ___________
Correct Answer: Option A — collector
Detailed Academic Explanation:
collector is the correct answer to “The element that has the biggest size in a transistor is ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 39 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The input impedance of a transistor is ___________
Correct Answer: Option B — low
Detailed Academic Explanation:
low is the correct answer to “The input impedance of a transistor is ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
Question 40 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The value of a of a transistor is ___________
Correct Answer: Option B — less than 1
Detailed Academic Explanation:
less than 1 is the correct answer to “The value of a of a transistor is ___________”. This question is standard in competitive examination syllabi for Transistors.
💡Key Conceptual Anchor:Transistors
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A_C Fundamentals_ Circuits And Circuit Theory — Part 1
Master the next curriculum module with 40 exam-standard MCQs.
In competitive commission exams (FPSC, PPSC, KPPSC, SPSC, CSS, PMS), questions are frequently phrased with distractor options designed to catch rote learners. Whenever you answer an MCQ, read the Detailed Academic Explanation and Conceptual Anchor to understand why the remaining options are incorrect.