ASTM NCATT Analog Electronics Assessment
Newest (2025 - 2026 Update) From Real Past
Papers Questions – A Set Of 100 Most
Common Exam Frequently Tested Questions
And Answers In Details 100% Verified Exam
Highly Recommendable For Grade A+
1. Which component stores energy in an electric field?
A. Inductor
B. Resistor
C. Capacitor
D. Transformer
Answer: Capacitor
Explanation: A capacitor stores electrical energy in the electric field created
between its plates.
2. Which component opposes changes in current?
A. Capacitor
B. Inductor
C. Diode
D. Resistor
Answer: Inductor
Explanation: An inductor resists sudden changes in current by storing energy in a
magnetic field.
, 3. The SI unit of resistance is:
A. Volt
B. Ampere
C. Watt
D. Ohm
Answer: Ohm
Explanation: Resistance is measured in ohms (Ω).
4. Ohm's Law is expressed as:
A. P = EI
B. E = P/I
C. V = IR
D. I = PR
Answer: V = IR
Explanation: Voltage equals current multiplied by resistance.
5. Which semiconductor device allows current primarily in one direction?
A. Transistor
B. Capacitor
C. Diode
D. Relay
Answer: Diode
Explanation: A diode conducts during forward bias and blocks reverse current
under normal operation.
6. Silicon diodes typically have a forward voltage drop of approximately:
,A. 0.2 V
B. 0.3 V
C. 0.7 V
D. 2.0 V
Answer: 0.7 V
Explanation: Most silicon PN junction diodes require about 0.7 volts before
conducting.
7. A transistor used for amplification normally operates in the:
A. Cutoff region
B. Saturation region
C. Breakdown region
D. Active region
Answer: Active region
Explanation: Linear amplification occurs when a transistor operates in its active
region.
8. Which terminal controls current flow in a BJT?
A. Collector
B. Emitter
C. Base
D. Drain
Answer: Base
Explanation: A small base current controls a much larger collector current.
9. An NPN transistor turns on when the base is:
A. Negative with respect to emitter
, B. Equal to emitter
C. Floating
D. Positive with respect to emitter
Answer: Positive with respect to emitter
Explanation: The base-emitter junction must be forward biased.
10.Which transistor terminal usually carries the largest current?
A. Base
B. Collector
C. Gate
D. Substrate
Answer: Collector
Explanation: Collector current is much greater than base current during normal
operation.
11.A resistor's color bands identify its:
A. Temperature
B. Voltage
C. Resistance value and tolerance
D. Power source
Answer: Resistance value and tolerance
Explanation: The resistor color code indicates resistance and manufacturing
tolerance.
12.What is the phase difference between voltage and current in a purely
resistive AC circuit?
A. 90°
Newest (2025 - 2026 Update) From Real Past
Papers Questions – A Set Of 100 Most
Common Exam Frequently Tested Questions
And Answers In Details 100% Verified Exam
Highly Recommendable For Grade A+
1. Which component stores energy in an electric field?
A. Inductor
B. Resistor
C. Capacitor
D. Transformer
Answer: Capacitor
Explanation: A capacitor stores electrical energy in the electric field created
between its plates.
2. Which component opposes changes in current?
A. Capacitor
B. Inductor
C. Diode
D. Resistor
Answer: Inductor
Explanation: An inductor resists sudden changes in current by storing energy in a
magnetic field.
, 3. The SI unit of resistance is:
A. Volt
B. Ampere
C. Watt
D. Ohm
Answer: Ohm
Explanation: Resistance is measured in ohms (Ω).
4. Ohm's Law is expressed as:
A. P = EI
B. E = P/I
C. V = IR
D. I = PR
Answer: V = IR
Explanation: Voltage equals current multiplied by resistance.
5. Which semiconductor device allows current primarily in one direction?
A. Transistor
B. Capacitor
C. Diode
D. Relay
Answer: Diode
Explanation: A diode conducts during forward bias and blocks reverse current
under normal operation.
6. Silicon diodes typically have a forward voltage drop of approximately:
,A. 0.2 V
B. 0.3 V
C. 0.7 V
D. 2.0 V
Answer: 0.7 V
Explanation: Most silicon PN junction diodes require about 0.7 volts before
conducting.
7. A transistor used for amplification normally operates in the:
A. Cutoff region
B. Saturation region
C. Breakdown region
D. Active region
Answer: Active region
Explanation: Linear amplification occurs when a transistor operates in its active
region.
8. Which terminal controls current flow in a BJT?
A. Collector
B. Emitter
C. Base
D. Drain
Answer: Base
Explanation: A small base current controls a much larger collector current.
9. An NPN transistor turns on when the base is:
A. Negative with respect to emitter
, B. Equal to emitter
C. Floating
D. Positive with respect to emitter
Answer: Positive with respect to emitter
Explanation: The base-emitter junction must be forward biased.
10.Which transistor terminal usually carries the largest current?
A. Base
B. Collector
C. Gate
D. Substrate
Answer: Collector
Explanation: Collector current is much greater than base current during normal
operation.
11.A resistor's color bands identify its:
A. Temperature
B. Voltage
C. Resistance value and tolerance
D. Power source
Answer: Resistance value and tolerance
Explanation: The resistor color code indicates resistance and manufacturing
tolerance.
12.What is the phase difference between voltage and current in a purely
resistive AC circuit?
A. 90°
