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Free download in PDF Transmission and Distribution Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
Shunt capacitance is neglected in case of
[A]
Medium and long transmission lines
[B]
Long transmission lines
[C]
Medium transmission lines
[D]
Short transmission lines
Answer: Short transmission lines
(22)
The effect of capacitance can be neglected when the length of overhead transmission line does not exceed
[A]
20 km
[B]
60 km
[C]
120 km
[D]
300 km
(23)
120 km long transmission line is considered as a
[A]
Short line
[B]
Medium line
[C]
Long line
[D]
Either (a) or (b)
(24)
A 25 km 33 kv transmission line is considered to be
[A]
Short transmission line
[B]
Medium transmission line
[C]
Long transmission line
[D]
High power line
Answer: Short transmission line
(25)
A 160 km, 110 kv transmission line falls under the category of
[A]
Short transmission line
[B]
Medium transmission line
[C]
Long transmission line
[D]
Ultra high voltage line
Answer: Long transmission line
(26)
Constant power locus of a transmission line at a particular sending end and receiving end voltage is
[A]
A straight line
[B]
A parabola
[C]
An ellipse
[D]
A circle
(27)
As the height of the transmission tower is increased, the line capacitance and line inductance respectively
[A]
Decreases, decreases
[B]
Increases, decreases
[C]
Decreases, remains unlatered
[D]
Increases, increases
Answer: Decreases, remains unlatered
(28)
The corona discharge on transmission lines may be avoided by
[A]
Increasing effective conductor radius
[B]
Increasing the operating voltage
[C]
Decreasing the spacing between the conductors
[D]
None of these
Answer: Increasing effective conductor radius
(29)
Booster transformer is located at
[A]
Sending end of transmission line
[B]
Intermediate point on a transmission line
[C]
Receiving end of transmission line
[D]
None of these
Answer: Intermediate point on a transmission line
(30)
Voltage gradient on a transmission line conductor is highest
[A]
At the surface of the conductor
[B]
At the centre of the conductor
[C]
At the distance equal to one radius from the surface
[D]
None of these
Answer: At the surface of the conductor
31
Voltage control in a power transmission line is achieved by
[A]
Booster transformer
[B]
Tap-changing transformer
[C]
Injection of reactive power
[D]
All of these
32
In a power transmission line, the sag depends on
[A]
Conductor material alone
[B]
Tension in conductors alone
[C]
Span of transmission line
[D]
All of these
33
For maximum efficiency in transmission of bulk ac power, the power factor of the load should be
[A]
Unity
[B]
Considerably less than unity
[C]
Slightly less than unity leading
[D]
Slightly less than unity lagging
Answer: Slightly less than unity lagging
34
Use of bundle conductors causes the critical voltage for corona formation
[A]
To decrease
[B]
To increase
[C]
To remain unlatered
[D]
Does not existent
35
The function of guard ring transmission lines is
[A]
To reduce the transmission losses
[B]
To reduce the earth capacitance of the lowest unit
[C]
To increase the earth capacitance of the lowest unit
[D]
None of these
Answer: To reduce the transmission losses
36
Phase modifier is normally installed in case of
[A]
Short transmission lines
[B]
Medium length lines
[C]
Long lines
[D]
For any length of lines
37
Constant voltage transmission have the advantage(s) of
[A]
Increase of short-circuit current of the system
[B]
Large reserve of lines in case of line trouble
[C]
Improvement of power factor at the times of moderate and heavy loads
[D]
none of the above
Answer: Improvement of power factor at the times of moderate and heavy loads
38
On transmission line, whenever the conductors are dead ended or there is change in the direction of transmission line, the insulators used are
[A]
Strain type
[B]
Suspension type
[C]
Pin type
[D]
None of these
39
The current by alternate charging and discharging of transmission line due to ac voltage is called
[A]
Oscillating voltage
[B]
Charging current
[C]
Line current
[D]
Discharging current
40
Ground wire is used in transmission system
[A]
To give good insulation
[B]
To avoid overloading
[C]
To connect a circuit conductor or other device to an earth plate
[D]
None of these
Answer: To connect a circuit conductor or other device to an earth plate
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