4. Multiple Choice. Circle the most correct answer. Ten problems, three points

each for a total of 30 points.

Note this Problem Continues on the Next Page

A. As discussed in class, the most common load model for the power flow is

A. Constant impedance

B. Constant current

C. Constant power

B. We can only use per phase analysis when:

A. All loads and sources are Y connected

B. All loads and sources are delta connected

C. There is no mutual inductance between phases

D. A and C

E. B and C

C. Which statement about phase and line voltages (V) and currents (I) in Wye and Delta

connections is correct?

A. Phase I = line I in Wye, and phase V = line V in Delta

B. Phase I = line I in Delta, and phase V = line V in Wye

C. Phase I = line I and phase V = line V in Wye

D. Phase I = line I and phase V = line V in Delta

D. Using Newton’s method to solve the equation x2 –sin(x) – 2 = 0, with an initial guess of

x=1 (that is, its value at the zero iteration), select the value that is closest to the value of

x after the second iteration:

A. 1.6754

B. 1.7775

C. 1.8073

D. 2.3041

E. 2.3253

E. The impedance of a 10 MVA, 22/220 kV transformer is 0.2 per unit. What is this

impedance in per unit for a power base of 10 MVA, and a voltage base of 11 kV on the

low voltage side of the transformer?

A. 0.05 p.u.

B. 0.1 p.u.

C. 0.2 p.u.

D. 0.4 p.u.

E. 0.8 p.u.

F. Transformer open circuit (OC) and short circuit (SC) tests allow us to calculate certain

equivalent circuit values. Which parameters are calculated from the OC test and which

are from the SC test?

A. The OC test gives the resistances and the SC test gives the reactances

B. The OC test gives the series impedance and the SC test gives the shunt

admittance

C. The OC test gives the shunt admittance and the SC test gives the series

impedance

D. The OC test gives the voltages and the SC test gives currents

G. In a long line Pi model, we use series impedance Z’ and shunt admittance Y’/2. In the

short line model, we use:

A. Series impedance Z’ and shunt admittance Y’/2

B. Series impedance Z’ and shunt admittance Y/2

C. Series impedance Z and shunt admittance Y/2

D. Series impedance Z and shunt admittance 0

E. Series impedance 0 and shunt admittance 0

H. In the power flow at the slack (swing) bus,

A. P and V are fixed

B. P and Q are fixed

C. P and ƟV are fixed

D. V and Q are fixed

E. None of the above

I. A solid conductor has a conductor area of 1113 kcmils. What is its outside diameter, in

inches?

A. 1.055”

B. 1.293”

C. 1113”

D. 1.044”

J. If the diameter of a transmission line conductor is increased, then:

A. Both the inductance and the capacitance increase

B. The inductance increases and the capacitance decreases

C. The inductance decreases and the capacitance increases

D. Both the inductance and the capacitance decrease

E. The inductance decreases and the capacitance remains unchanged

-29%

# Power System Analysis And Design SI Edition 6th Edition By Glover – Test Bank

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