This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “The CB Short Circuit Current Frequency Response”.
1. Where is the input measured in a CB short circuit current frequency response?
a) Collector terminal
b) Emitter terminal
c) Base terminal
d) Ground
View Answer
Explanation: In the physical model of a CB short circuit current frequency response the input is measured at the emitter terminal of the BJT biased device. Whereas, the output is measured across the collector terminal of the biased BJT device.
2. Which parameter of the physical model is varied while measuring the input characteristics of a CB short circuit current frequency response?
a) Emitter current
b) Emitter voltage
c) Collector current
d) Emitter base voltage
View Answer
Explanation: To determine the input characteristics, the collector – base voltage is kept constant at zero volts and the emitter base voltage is increased from zero volts to different voltage levels. For each voltage level of the input voltage, the input current is recorded.
3. Where is the output measured in a CB short circuit current frequency response?
a) Collector terminal
b) Emitter terminal
c) Base terminal
d) Ground
View Answer
Explanation: In the physical model of a CB short circuit current frequency response the output is measured at the collector terminal of the BJT biased device. Whereas, the input is measured across the emitter terminal of the biased BJT device.
4. Which parameter of the physical model is varied while measuring the output characteristics of a CB short circuit current frequency response?
a) Emitter current
b) Emitter voltage
c) Collector current
d) Collector base voltage
View Answer
Explanation: To determine the output characteristics, the emitter current is kept constant at zero and the collector base voltage is increased from zero volts to varying voltage levels. For each voltage level of the output voltage, the collector current is recorded.
5. What is the path of the output characteristic of a CB short circuit current frequency response in the active region?
a) Linear
b) Exponential decrease
c) Exponential increase
d) Constant
View Answer
Explanation: In a CB short circuit current frequency response model, the output characteristic curve first increases exponentially and then remains constant. In the active region of working the output characteristics show a constant value collector current with respect to collector base voltage.
6. What is the path of the output characteristic of a CB short circuit current frequency response in the saturation region?
a) Linear
b) Exponential decrease
c) Exponential increase
d) Constant
View Answer
Explanation: In a physical model of a CB short circuit current frequency response, the output characteristic curve first increases exponentially and then remains constant. In the saturation region of working the output characteristics show an exponential increase in the collector current with respect to collector base voltage.
7. What is the path of the input characteristic of a CB short circuit current frequency response?
a) Linear
b) Exponential decrease
c) Exponential increase
d) Constant
View Answer
Explanation: In a CB short circuit current frequency response, the input characteristic curve increases exponentially. The emitter current increases exponentially with respect to emitter base voltage for fixed values of collector base voltage.
8. How do you calculate the dynamic input resistance of a CB short circuit current frequency response?
a) ΔVBE / ΔIC
b) ΔVBE / ΔIE
c) ΔVCB / ΔIC
d) ΔVCB / ΔIE
View Answer
Explanation: Dynamic input resistance is defined as the ratio of change in emitter base voltage to the corresponding change in the emitter current. While the collector voltage is kept at a constant value. Therefore, ri = ΔVBE / ΔIE.
9. What is the value of voltage VB of a CB short circuit current frequency response configuration if VCC = 12V, R1 = 25kΩ and R2 = 6kΩ?
a) 2.84V
b) 13.03V
c) 2.45V
d) 2.32V
View Answer
Explanation: The voltage VB of a simplified CB short circuit current frequency response configuration can be calculated using VB = I × R2. Given, VCC = 12V and R1 = 25kΩ and R2 = 6kΩ:
I = VCC / R1 + R2 = 12 / (25 + 6) = 0.387mA
VB = I × R2 = 0.387mA × 6kΩ = 2.32V
10. What is the bias of a simplified CB short circuit current frequency response configuration?
a) Reverse biased
b) Forward biased
c) Forward and reverse biased
d) It is independent of the bias
View Answer
Explanation: The CB short circuit current frequency response operates such that the input signal is applied to the emitter terminal and the output is taken from the collector terminal. The emitter current is also the input current, and the collector current is also the output current. The base – emitter junction is forward – biased.
Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.
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