Electrical Engineering Answers

Question 4
4.1 A 600 MVA, 50 Hz turbine-generator has a regulation constant R=0.06 per
unit based on its own rating. If the generator frequency increases by 0.02 Hz
in steady-state, what is the decrease in mechanical power output. Assume
a fixed reference power setting. (5)
4.2 A three-phase, 50 Hz, 100 MVA, 4-pole synchronous generator has an
inertia constant H of 3.5 s and is supplying 0.16 pu real power on a system
base of 500 MVA. The input to the generator is increased to 0.18 pu. Determine:
4.2.1 The kinetic energy stored in the moving parts of the generator (2)
4.2.2 The acceleration of the generator

Multiple Choose questions

Question 10
Th goal of the equal area criteria in transient stability is to determine whether a system
is stable or not without having to completely integrate the system response. The
system will be stable after the fault if:
(1) The acceleration area is greater than 1.0 per unit.
(2) The acceleration area is greater than the deceleration area.
(3) The deceleration area is smaller than the acceleration area.
(4) The deceleration area is greater than the acceleration area.

Question 1
Which of the following is an advantage of using bundled conductors in transmission
lines?
(1) They reduce radio interference and corona at the cost of increasing line series
reactance.
(2) They reduce line series reactance, radio interference and corona.
(3) They increase line charging reactance and series reactance.
(4) They have high tensile strength and increase the skin effect.

Multiple Choice questions

Question 2
When line losses are neglected, simpler expressions for line parameters are
obtained. How are the expressions of the exact

Multiple Choose question


Question 1
Which of the following is an advantage of using bundled conductors in transmission
lines?
(1) They reduce radio interference and corona at the cost of increasing line series
reactance.
(2) They reduce line series reactance, radio interference and corona.
(3) They increase line charging reactance and series reactance.
(4) They have high tensile strength and increase the skin effect.

Question 3 multiple choices
In respect of the power flow problem, the following four variables are associated with
each bus

Multiple Choice questions

Question 2
When line losses are neglected, simpler expressions for line parameters are
obtained. How are the expressions of the exact

Multiple Choo questions
Question 10
Th goal of the equal area criteria in transient stability is to determine whether a system
is stable or not without having to completely integrate the system response. The
system will be stable after the fault if:
(1) The acceleration area is greater than 1.0 per unit.
(2) The acceleration area is greater than the deceleration area.
(3) The deceleration area is smaller than the acceleration area.
(4) The deceleration area is greater than the acceleration area.

Question 1
Which of the following is an advantage of using bundled conductors in transmission
lines?
(1) They reduce radio interference and corona at the cost of increasing line series
reactance.
(2) They reduce line series reactance, radio interference and corona.
(3) They increase line charging reactance and series reactance.
(4) They have high tensile strength and increase the skin effect.

a single phase overhead transmission line delivers 5000 kw at 11 KV and 0.8 factor lagging. total resistance and inductive reactance per conductor is 0.45 ohm and 0.08 ohm respectively , calculate line losses

Multiple choice questions
Question 5
Because of the nature of the power flow bus data, nodal equations do not directly fit
the linear-equation format, and power flow equations are actually nonlinear. However,
the Gauss-Siedel method can be used for the power flow solution.
(1) True.
(2) Only true for systems with less than 14 buses.
(3) False.
(4) Only true for systems with fully transposed transmission lines.