Free Printable SEEU1002_Etech_Quiz 3 (Ch3-Three Phase)[2021-2]

1.

A typical distribution system consist all of the following except ___________.

a)

Substations

b)

Distribution Feeder Circuits & Switches

c)

Protective Equipment

d)

Primary Circuits & Distribution Transformers

e)

Security Guard

2.

The following are the major cost components associated with generation, transmission and distribution of electricity from the power stations to end-users except ______________.

a)

Fuel & capital for new infrastructure including finance cost

b)

Power purchase from independent power producers

c)

Operation and maintenance

d)

Procurement of parts and equipment

e)

Staff uniform, safety apparel and meals

3.

For balanced source, the three sources have _________.

a)

equal magnitudes and are phase displaced from one another by 120 electrical degrees.

b)

equal magnitudes and are in-phase from one another.

c)

equal magnitudes and are phase displaced from one another by 240 electrical degrees.

d)

equal magnitudes and are phase displaced from one another by 120 civil degrees.

e)

$\sqrt{3}V_{Line}\angle120\degree\ volts$

4.

X is _________.

a)

Stator

b)

Rotor

c)

Motor

d)

Statham

e)

Statue

5.

RYB is _____________.

a)

the positive sequence where phase R followed by phase Y followed by phase B.

b)

the negative sequence.

c)

a type of three phase connection.

d)

a delta connection.

e)

a star connection.

6.

There are two types of three phase system connection - star and delta. Star has the value of phase current _______.

a)

equal to $\sqrt{3}\left(Line\ current\ \right)$ and same phase angle

b)

equal to line current in term of magnitude and phase angle

c)

unknown

d)

equal to $\sqrt{3}\left(line\ current\right)\angle-30\degree$

e)

equal to $\frac{1}{\sqrt{3}}\left(line\ current\right)\angle-30\degree$

7.

The phase current, IYY' for an RBY delta connection given that the IRR'= $Irms\angle-16\degree\ A$

a)

$Irms\angle104\degree\ A$

b)

$Irms\angle-136\degree\ A$

c)

$Irms\angle136\degree\ A$

d)

$Irms\angle-104\degree\ A$

e)

$Irms\angle-30\degree\ A$

8.

In a 4 wire star connection system, what is the value of the current in the neutral line if the load is balanced: __________________.

a)

0 A

b)

equal to the current in phase R generator

c)

equal to the current in phase R load

d)

$=I_R\ +\ I_Y\ -\ I_B$

e)

$=I_R\ -\ I_Y\ -\ I_B$

9.

The phase R voltage of a star connected load is equal to _____.

a)

$\sqrt{3}V_{Line}\angle30\degree$

b)

$\frac{1}{\sqrt{3}}V_{Line}\angle-30\degree$

c)

$\frac{1}{\sqrt{3}}V_{Line}\angle30\degree$

d)

$\sqrt{3}V_{Line}\angle-30\degree$

e)

the voltage across R-Y line

10.

There are ___________ possible types of connection between the generator and the load. (E.g Delta- Delta connection)

a)

5

b)

4

c)

3

d)

6

e)

2

SEEU1002_Etech_Quiz 3 (Ch3-Three Phase)[2021-2]

Total questions: 10

Worksheet time: 5mins

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