check

MCQ's Principles of Symmetrical Components Assessment

If you think you have a good understanding of the Principles of Symmetrical Components, challenge yourself and start a quiz now.

Click the button below to start.

Start

Question 1 of 12

Q.01 Why do we need symmetrical components?

A

To calculate balanced faults

B

To calculate unbalanced faults

C

To calculate bolted faults

Question 2 of 12

Q.02 Which conditions should be verified in order to find out whether a set of phasors is symmetrical or not?

A

Equal magnitude

B

Equal phase angle

C

Both

Question 3 of 12

Q.03 Which sequence should be followed by phasors in order to assure symmetry?

A

ABC

B

ACB

C

Both

Question 4 of 12

Q.04 What is the difference between ABC system and ACB system?

A

Phase sequence

B

Phasor magnitudes

C

Phase angles

Question 5 of 12

Q.05 How many symmetrical components are generated from a single set of unbalanced phasors?

A

1

B

3

C

6

Question 6 of 12

Q.06 What is the sequence of symmetrical components when the unbalanced phasors have ACB phase sequence?

A

Positive= ACB; Negative=ACB; Zero=none

B

Positive= ACB; Negative=ABC; Zero=none

C

Positive= ABC; Negative=ACB; Zero=none

Question 7 of 12

Q.07 What would be the resultant when we add all three symmetrical components respectively?

A

A balanced set of phasors

B

The original unbalanced set of phasors

C

A different set of phasors

Question 8 of 12

Q.08 How many symmetrical components are generated from a single set of balanced phasors?

A

1

B

3

C

6

Question 9 of 12

Q.09 Why do we need ‘a’ operator?

A

To define all phasors in terms of one

B

It is present in the formula

C

No particular reason

Question 10 of 12

Q.10 Is the ‘a’ operator sequence specific? (different for ABC and ACB phase sequence?)

A

Yes, in all cases

B

Yes, in some cases

C

No

Question 11 of 12

Q.11 What is the benefit of using ‘a’ operator?

A

Decreases number of variables

B

Reduces equation complexity

C

Both

Question 12 of 12

Q.12 How can we find symmetrical components from System phasors?

A

Iₛᵧₘₘₑₜᵣᵢ𝒸ₐₗ = A * Iₛᵧₛₜₑₘ

B

Iₛᵧₘₘₑₜᵣᵢ𝒸ₐₗ= A⁻¹ * Iₛᵧₛₜₑₘ

C

Iₛᵧₘₘₑₜᵣᵢ𝒸ₐₗ = Iₛᵧₛₜₑₘ / A

Confirm and Submit