# Electronic Devices and Circuits Questions and Answers – Measurement of H-Parameters

This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Measurement of H-Parameters”.

1. For the two – port network shown below, assume R1 = R2 = 10kΩ. What is the value of the hybrid parameter h22?

a) 0.1 mho
b) 10 mhos
c) 20 mhos
d) 15 mhos

Explanation: To calculate h22, we open circuit the input terminal. Hence the current flowing through resistor R1 is zero and the voltage V1 across the input terminal is equal to the voltage V2 across output terminal. Therefore, to find h22, given that R2 = 10kΩ.
V1 = V2
I2 = V2 / 10kΩ
h22 = I2 / V2 = 0.1 mho

2. For the two – port network shown below, assume R1 = R2 = 10kΩ. What is the value of the hybrid parameter h11?

a) 10kΩ
b) 20kΩ
c) 10kΩ
d) 5kΩ

Explanation: To calculate h11, we short circuit the output terminal. Hence the current flowing through resistor R2 is zero. Therefore, to find h11, given that R1 = 10kΩ.
V1 = R1 x I1 (According to Ohm’s law)
h11 = V1 / I1 = R1 x I1 / I1 = R1 = 10kΩ.

3. How do we calculate the inverse hybrid parameter g11 of a two – port network?
a) g11 = I1 / V1
b) g11 = I2 / V1
c) g11 = I1 / V2
d) g11 = I2 / V2

Explanation: The inverse hybrid parameter g11 for a two – port network is calculated by open circuiting the output terminal. In this case, the current I2 is equal to zero. The parameter g11 is calculated by taking the ratio of input terminal current over input terminal voltage.

4. What are the hybrid parameters used to analyze?
a) MOSFET
b) Junction Field Effect Transistor
c) Bipolar Junction Transistor
d) It has no use

Explanation: The four hybrid parameters of a two – port network are used to analyze the workings of a Bipolar Junction Transistor or in other words a BJT. The inverse hybrid parameters are used to analyze the Junction Field Effect Transistor of JFET.

5. How is the h21 hybrid parameter of a two – port network used?
a) It is used as a voltage source at input port
b) It is used as a current source at input port
c) It is used as a voltage source at output port
d) It is used as a current source at output port

Explanation: While checking the hybrid parameter equivalent network of a two – port network we see that the hybrid parameter h21 is sued as a current source at the output port. While using Kirchhoff’s current law, the hybrid parameter equations can be represented as a current source of h21I1.

6. How do we calculate the inverse hybrid parameter g21 of a two – port network?
a) g21 = I1 / I2
b) g21 = I2 / I1
c) g21 = V2 / V1
d) g21 = V1 / V2

Explanation: The inverse hybrid parameter g21 for a two – port network is calculated by open circuiting the output terminal. In this case, the current I2 is equal to zero. The parameter g21 is calculated by taking the ratio of output terminal voltage over input terminal voltage. It is also known as the open circuit voltage gain.

7. How is the h12 hybrid parameter of a two – port network used?
a) It is used as a voltage source at output port
b) It is used as a current source at output port
c) It is used as a voltage source at input port
d) It is used as a current source at input port

Explanation: While checking the hybrid parameter equivalent network of a two – port network we see that the hybrid parameter h12 is sued as a voltage source at the input port. While using Kirchhoff’s voltage law, the hybrid parameter equations can be represented as a fixed voltage source of h21V2.

8. How do we calculate the inverse hybrid parameter g12 of a two – port network?
a) g12 = I2 / I1
b) g12 = I1 / I2
c) g12 = V1 / V2
d) g12 = V2 / V1

Explanation: The inverse hybrid parameter g12 for a two – port network is calculated by short circuiting the input terminal. In this case, the current V1 is equal to zero. The parameter g12 is calculated by taking the ratio of input terminal current over output terminal current.

9. How do we calculate the inverse hybrid parameter g22 of a two – port network?
a) g22 = V2 / I1
b) g22 = I1 / V2
c) g22 = V1 / I2
d) g22 = V2 / I2

Explanation: The inverse hybrid parameter g22 for a two – port network is calculated by short circuiting the output terminal. In this case, the current V1 is equal to zero. The parameter g22 is calculated by taking the ratio of output terminal voltage over output terminal current.

10. We can measure hybrid h – parameters using inverse hybrid g – parameters.
a) True
b) False

Explanation: The hybrid h – parameters can be measured using the inverse hybrid g – parameters. All the parameters used to analyze a two – port network can be used to convert and measure other different parameters.

Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.

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