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Test: Admittance - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Admittance

Test: Admittance for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Admittance questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Admittance MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Admittance below.
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Test: Admittance - Question 1

Which of the following is TRUE in case of the admittance of a circuit? 

Detailed Solution for Test: Admittance - Question 1

It is the measure of flow of current which is allowed by the circuit. 

Key Points:
Admittance (Y) 
is the measurement quantity that tells us how easily a conducting device can allow the flow of current through it. 

Admittance can be defined as a reciprocal of impedance (Z). i.e Y = 1/Z

Admittance measures the flow of current allowed by the circuit which is the inverse of the impedance function.

Test: Admittance - Question 2

Reciprocal of admittance is

Detailed Solution for Test: Admittance - Question 2

Admittance (Y):

The admittance of an AC circuit is defined as the reciprocal of its impedance (Z) i.e.

Y = 1 / Z = I / V

The unit of admittance is siemens (S).

Impedance (Z) is the opposition to alternating current flow, admittance (Y) is the inducement to alternating current flow.

Components of Admittance:

Depending upon the nature of reactance, the impedance of an AC circuit can be expressed in the complex form as :

Z = R + j XL

or, Z = R – j XC

Here, R is the resistive or in-phase component of Z while XL or XC is the reactive or quadrature component of Z.

Using Admittance Triangle,

or,

From the above triangle,

Hence, Y = G ± j (Bc - BL)

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Test: Admittance - Question 3

The admittance of the electric circuit is represented by Y = (3 + j4). What is the value of resistance in this circuit?

Detailed Solution for Test: Admittance - Question 3

Formula:

The admittance(Y) can be written as:

Y = G ± jB

G = Conductance

B = Susceptance

The impedance(Z) of a circuit can be written as:

Z = R ± jX

R = Resistance

X = Reactance

The relation between impedance and admittance

Z=1Y

Calculation:

Y = 3 + j4

Resistance (R) = 3 / 25 Ω

Test: Admittance - Question 4

_______ is defined as a measure of how easily a circuit or device will allow current to flow through it.

Detailed Solution for Test: Admittance - Question 4

Resistance

It is an electrical parameter that is used as the measurement of opposition to the electric current.

The reciprocal of the resistance is called the 'Admittance'.

Resistance is defined as:

R = ρl / A

ρ: Resistivity of the material

l: length of the conductor

A: Area of the cross-section of the conductor.

It is measured in Ω.

Impedance:

The complex quantity of the resistance is defined as the Impedance of a circuit. 

It is the same as that of the resistance.

Admittance

It is defined as the parameter which is used to measure the flow of current easily in a circuit.

admitatance = 1 / resistance

It is measured in Ω-1 or Siemens(S).

From Ohm's law admittance is:

Admittance = I / V

Capacitance

It is an electrical element that stores energy in the form of a static electric charge.

Energy stored in a capacitor is:

E = 1 / 2CV2

V: Voltage across the capacitor.

SI unit is Farads. (F)

Conclusion:

Option 2 is correct.

Test: Admittance - Question 5

The relationship between impedance (Z) and admittance (Y) is

Detailed Solution for Test: Admittance - Question 5

The relationship between the impedance and admittance is given by:

 Z = 1/Y

where Z = Impedance

Y = Admittance

The impedance is analogous to admittance in the following ways:

Test: Admittance - Question 6

In a parallel circuit, we consider _____________ instead of impedance.

Detailed Solution for Test: Admittance - Question 6

In a parallel circuit, we consider admittance instead of impedance, where admittance is the reciprocal of impedance.

Test: Admittance - Question 7

Which, among the following is the correct expression for admittance?

Detailed Solution for Test: Admittance - Question 7

We know that admittance is the reciprocal of impedance, hence the correct expression for admittance is:
Y = 1/Z.

Test: Admittance - Question 8

What is the unit of admittance?

Detailed Solution for Test: Admittance - Question 8

he unit for admittance is ohm-1 because the unit of impedance is ohm and admittance is the reciprocal of impedance.

Test: Admittance - Question 9

if the impedance of a system is 4 ohm, calculate its admittance.

Detailed Solution for Test: Admittance - Question 9

We know that: Y = 1/Z.
Substituting the value of Z from the question, we get
Y = 1/4 = 0.25
⇒ Y= 0.25 ohm-1.

Test: Admittance - Question 10

As the impedance increases, the admittance ____________

Detailed Solution for Test: Admittance - Question 10

As the impedance increases, the admittance decreases because admittance is equal to 1 / impedance.

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