Instrumentation Transducers

Measurement of Impedance

Question 1
Marks : +2 | -2
Pass Ratio : 100%
What is the advantage of Owens Bridge over other AC bridges?
High quality factor
Can measure inductance over wide range
Both high Q factor and wide range operation
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.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Measurement of impedance involves calculating ______________
Resistive component of impedance
Reactive component of impedance
Both resistive and reactive component of impedance
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.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
AC equivalent of resistance is impedance.
True
False
Explanation:
Resistance is a DC parameter and impedance is an AC parameter which can be treated as AC equivalent of resistance.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
What will you call an impedance with a zero phase angle?
Resistance
Reactance
Impedance itself
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.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
What is the purpose of Owens Bridge?
Measurement of resistance
Measurement of current
Measurement of reactance
Measurement of voltage
Explanation:
Owens Bridge is an AC bridge which is used to measure reactance.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Impedance can be measured by connecting an ohm meter across input or output.
True
False
Explanation:
Connecting an ohm meter across input or output of a circuit will indicate DC resistance only. Impedance is an AC parameter.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which of the following statement is correct for impedance?
Time domain ratio of voltage to current
Time domain ratio of current to voltage
Frequency domain ratio of voltage to current
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.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which of the following range represents the quality factor of Owens Bridge?
Less than 1
1 to 10
Very high
Negligible
Explanation:
Owen Bridge is used for measuring reactance and it has got very high quality factor.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which of the following scientist was first to represent impedance with complex numbers?
Arthur Kennelly
Oliver Heaviside
Edwin J. Houston
Edward Victor Appleton
Explanation:
Arthur Kennelly was the first scientist to express impedance in terms of complex numbers.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which of the following statement is correct for impedance?
For ideal resistance and ideal inductor it is purely real
For ideal resistance and ideal inductor it is purely imaginary
For ideal resistance it is purely real, and for ideal inductor it is purely imaginary
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.