$1.$ What is the per unit system?

a$)$ A method used to convert $\backslash ($ A C $\backslash )$ power to $\backslash ($ D C $\backslash )$ power.

b$)$ A system used to measure power in units of volts

c$)$ A method used in power system analysis to simplify

d$)$ A system used to measure power consumption in units of calculations by normalizing quantities to a common base. kilowatthours.

$2.$ Why is the per unit system used in power systems and electrical cricuits?

a$)$ To reduce the efficiency of power systems and electrical

b$)$ To increase the accuracy of calculations and comparisons crecuts

c$)$ To simplify calculations and comparisons

d$)$ To complicate calculations and oomparisons

$3.$ How is the per unit system diferent from other unit systems?

a$)$ The per unit system is based on the metric system

b$)$ The per unit system is used for measuring time.

c$)$ The per unit system normalizes quantities in power system

d$)$ The per unit system is used only in electrical engineering. analysis.

$4.$ What is the formula for converting values from actual values to per unit?

a$)$ Per Unit Value $=$ Actual Value $-$ Base Value

b$)$ Per Unit Value $=$ Actual Value $\text{'}$ Base Value

c$)$ Per Unit Value $\backslash (=\backslash )$ Actual Value $+$ Base Value

d$)$ Per Unit Value $=$ Actual Value $/$ Base Value

$5.$ How is the per unt system used in power system analysis?

a$)$ The per unit system is used to convert $\backslash ($ A C $\backslash )$ power to $\backslash ($ D C $\backslash )$ power b$)$ The per unit system is used to calculate power losses in power in power system analysis.

c$)$ The per unit system is used to normalize values in power system analysis system analysis.

d$)$ The per unit system is used to measure power consumption in power system analysis.

$6.$ What are the advantages of using the per unit system in power systems?

a$)$ The advantages of using the per unit system in power systems b$)$ Increases calculation errors, complicates analysis, hinders are: simplifies calculations, allows for easy comparison. system representation facileates analysis, enables effcient representation.

c$)$ Reduces complexity, enables accurate measurements,

d$)$ Limits flexibitity, hampers comparison, slows down calculations improves system stabitity

$7.$ How is the per unt system used in transtormer analysis?

a$)$ To normalize the values of voltage, current, and impedance to b$)$ To convert the values of voltage, current, and impedance to a common base value. different base values

c$)$ To determine the efficiency of a transformer.

d$)$ To calculate the power loss in a transformer.

$8.$ In which part of the power system has the lowest voltage?

a$)$ Distribution

b$)$ Transmission

c$)$ Grid

d$)$ Generation

Q$.$ Transmission line usually have highest voltage in the components of power system.

a$)$ False

b$)$ True

$10.$ Base impedanoe of the power system is given as:

a$)($Base kV$)$Base MVA

b$)$ Base MVA $($Base kV$)\backslash (\{\}^\{2\}\backslash )$

c$)($Base IV$)\backslash ()^\{2\}\backslash )$ Base MVA

d$)$ None of these

$11.$ A generator is rated of of $10$ MVA $,$ and $33$ kV $.$ The base impedance will be

a$)2089$ chm

b$)100$ ohm

c$)4089$ ohm

d$)1089$ ohm

$12.$ The unit for base impedance is in $.........$ohm

a$)$ True

b$)$ False

$13.$ The per unit impedance of a power transmission line is X PU$.$ If the base voltage is tripled and the base MVA is doubled, what will be the new per unit impedance?

a$)\backslash ($ x $\backslash )$

b$)\backslash (\backslash$frac$\{1\}\{9\}\backslash$mathrm$\{$X$\}\backslash )$

e$)\backslash (9$ x $\backslash )$

d$)\backslash (\backslash$frac$\{2\}\{9\}\backslash$mathrm$\{$x$\}\backslash )$

$14.$ A synchronous generator rated $\backslash (11\backslash$mathrm$\{$kV$\},50\backslash$mathrm$\{$MVA$\}\backslash )$ has per unit impedance of $0\mathrm{.}2$ PU on its own base. Then its impedance referred to a $\backslash (22\backslash$mathrm$\{$kV$\},150\backslash )$ MVA base would be

a$)0\mathrm{.}15$ pu

b$)0\mathrm{.}133$ pu

c$)0\mathrm{.}1$ pu

d$)0\mathrm{.}2$ pu

$15.$ The per unit impedance of a transtormer in a real$-$word scenario is

a$)$ larger $7$ computed from the primary side compared to the

b$)$ always zero

secondary side

c$)$ the same whether computed from the primary or secondary

d$)$ always infinity side