Part 1 – Multiple-Choice Questions
For the following questions, select which answer is TRUE.
Question 1 (# marks)
The operator j = 1/90° and a = 1/120°:
a) j3 = 1
b) a4 = a
c) a3 = j2
d) a2 = 1+ a
[Insert answer here]
Ans: b)
Question 2 (# marks)
The per unit value of Z11kV line = (2.42 +j 3.63) Ω on a 10 MVA Base is:
a) (0.1 + j0.15) pu
b) (0.2 + j0.3) pu
c) (0.3 + j0.45) pu
d) (0.4 + j0.6) pu
[Insert answer here]
Ans: b)
Question 3 (# marks)
A 60 MVA transformer has R = 0.6% and X = 7.5%. Calculate in rectangular form the per unit
values on a 100MVA base:
a) (0.01 + j0.125)pu
b) (0.02 + j0.125) pu
c) (0.015 + j0.25) pu
d) (0.015 - j0.25) pu
[Insert answer here]
Ans: a)
Question 4 (# marks)
Which of the following is correct?
a) Z, R, X are phasors that can be represented by an impedance ∆
b) S, P, Q are phasors that can be represented by a Power ∆
c) θ, the angle in the impedance ∆, is the angle by which I lags or leads V
d) In the power triangle, Q = S cos θ and P = S sin θ°
[Insert answer here]
Ans: b)
Question 5 (# marks)
The voltage V = 10 ∟-15° Volts in the frequency domain is equivalent to which voltage in the time
domain:
a) V (t) = 10 cos (ωt + 75)
b) V (t) = 10 √2 cos (ωt + 75)
c) V (t) = 10 sin (ωt + 75)
d) V (t) = 10 √2 sin (ωt - 75)

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Assignment | Multiple Choice Questions

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