# Instrumentation Transducers Questions and Answers – Measurement of Impedance

This set of Instrumentation Transducers Questions and Answers for Freshers focuses on “Measurement of Impedance”.

1. Measurement of impedance involves calculating ______________
a) Resistive component of impedance
b) Reactive component of impedance
c) Both resistive and reactive component of impedance
d) None of the mentioned

Explanation: Measurement of impedance is generally defined as the calculation of resistive and reactive components of impedance. Impedance is an AC quantity with magnitude and phase.

2. Impedance can be measured by connecting an ohm meter across input or output.
a) True
b) False

Explanation: Connecting an ohm meter across input or output of a circuit will indicate DC resistance only. Impedance is an AC parameter.

3. What will you call an impedance with a zero phase angle?
a) Resistance
b) Reactance
c) Impedance itself
d) Zero impedance

Explanation: Impedance is an AC parameter. It has both magnitude and phase. Impedance with zero phase angle is known as resistance which is a DC parameter.

4. AC equivalent of resistance is impedance.
a) True
b) False

Explanation: Resistance is a DC parameter and impedance is an AC parameter which can be treated as AC equivalent of resistance.

5. Which of the following scientist was first to represent impedance with complex numbers?
a) Arthur Kennelly
b) Oliver Heaviside
c) Edwin J. Houston
d) Edward Victor Appleton

Explanation: Arthur Kennelly was the first scientist to express impedance in terms of complex numbers.
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6. Which of the following statement is correct for impedance?
a) Time domain ratio of voltage to current
b) Time domain ratio of current to voltage
c) Frequency domain ratio of voltage to current
d) Frequency domain ratio of current to voltage

Explanation: Impedance is an AC parameter and it can be represented as a ratio of voltage to current in the frequency domain.

7. Which of the following statement is correct for impedance?
a) For ideal resistance and ideal inductor it is purely real
b) For ideal resistance and ideal inductor it is purely imaginary
c) For ideal resistance it is purely real, and for ideal inductor it is purely imaginary
d) For ideal resistor it is purely imaginary, and for ideal inductor it is purely real

Explanation: Impedance of pure resistance is purely real and for inductor purely imaginary, where the inductor is a reactive component.

8. What is the purpose of Owens Bridge?
a) Measurement of resistance
b) Measurement of current
c) Measurement of reactance
d) Measurement of voltage

Explanation: Owens Bridge is an AC bridge which is used to measure reactance.

9. What is the advantage of Owens Bridge over other AC bridges?
a) High quality factor
b) Can measure inductance over wide range
c) Both high Q factor and wide range operation
d) None of the mentioned

Explanation: Owen Bridge is an AC bridge which can be used to measure inductance in a wide range, and it has a high quality factor.

10. Which of the following range represents the quality factor of Owens Bridge?
a) Less than 1
b) 1 to 10
c) Very high
d) Negligible

Explanation: Owen Bridge is used for measuring reactance and it has got very high quality factor.

Sanfoundry Global Education & Learning Series – Instrumentation Transducers.

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