Download CCET 2

Dr. Mahalingam College of Engineering and Technology, Pollachi-3
(An Autonomous Institution affiliated to Anna University)
6
CCETII (2014 Regulation)
7
In any transmission line, AD − BC = 0 Say True/False
should be ................
a.low
Distribution
The line constants of a transmission line are ...........................
Name of Programme:BE-EEE
8
Sem: V Date& Session:08.08.16-AN2 Duration: 1½ hours Max. Marks: 40
Objective Questions
Q. No
CO
Blooms
No
Level
The power loss in an overhead transmission line is mainly
due to
1
a.Resistance
c.Capacitance
b.Inductance
U
If capacitance between two conductors of a 3-phase line is 4
2
to neutral is ................... .
U
Transposition of a 3-phase transmission line helps in................
4
5
..................... .
In short transmission lines, the effects of.................... are
neglected.
2
3
U
3
U
3
U
U
2
U
3
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d.zero
b. lumped
In a transmission line, generalised constants .................. and
..................... are equal.
When the regulation is positive, then receiving end voltage
(VR) is will be less than sending end voltage (VS).
Say True/False
Short Answer Questions
(5X2=10 Marks)
Blooms
No
Level
2
R
12
A 3-phase overhead transmission line has its conductors
arranged at the corners of an equilateral triangle of 2 m side.
Calculate the capacitance of each line conductor per km.
Given that diameter of each conductor is 1·25 cm.
2
U
13
Categorize the transmission lines based on the voltage level
3
R
14
List the limitation of End condenser method
3
U
15
What is the effect of load power factor in regulation
3
U
11
.
a. equalising inductance and capacitance of the three phases
b. equalising capacitance of the three phases
c. equalising inductance of the three phases
d. equalising resistance of the three phases
If the length of the line is decreased, its capacitance is
U
CO
a. 4 μF b. 8 μF c. 2 μF d. 12 μF
3
3
d. All the above
Q. No
2
c. medium
a.uniformly distributed
Part- B
d. None of the above
μF, then capacitance of each conductor
9
10
2
b. high
c.concentrated
(10X1=10 Marks)
Question
U
It is desirable that voltage regulation of a transmission line
Course Code & Course Title: 11EE502 – Generation, Transmission and
Part- A
3
Question
What is the relation between line to line capacitance and
capacitance to neutral
Part- C
Descriptive – either or questions
X10=20 Marks)
Signature of the Faculty
Q. No
Question
16.
Derive the capacitance equation of a three phase single
(a) circuit transmission line for symmetrical and
unsymmetrical spacing
CO
Blooms
No
Level
2
U
OR
(i)A single-phase transmission line has two parallel
conductors 3 metres apart, radius of each conductor being
1 cm. Calculate the capacitance of the line per km. Given
-12
16. that ԑ0=8·854 X 10 F/m.(4 Marks)
(b)
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3
U
3
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Code for Blooms Levels:
Sl.
Blooms Level
No.
1
Remember
2
Understand
3
Apply
4
Analyze
5
Evaluate
6
Create
Code
R
U
Ap
An
E
C
(ii)A 3-phase, 50 Hz,132 kV overhead line has conductors
placed in a horizontal plane 4 m apart. Conductor diameter
is 2 cm. If the line length is 100 km, calculate the charging
current per phase assume complete transposition
(6 Marks)
17.
(a)
2
Note:
Explain the Nominal T method of medium transmission
line with equivalent circuit and phasor diagrams
OR
A 3-phase, 50Hz, 150 km line has a resistance, inductive
reactance and capacitive shunt admittance of 0·1ohm , 0·5
-6
(b) ohm and 3 × 10 S per km per phase. If the line delivers
50 MW at 110 kV and 0·8 p.f. lagging, Determine the
sending end voltage and current. Use nominal π method.
17.
Signature of the Faculty