Transmission and Distribution Quiz | Transmission and Distribution Objective Type Questions and Answers

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Questions
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

Answer: 60 km
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23 120 km long transmission line is considered as a
A Short line
B Medium line
C Long line
D Either (a) or (b)

Answer: Medium line
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

Answer: 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

Answer: 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

Answer: 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

Answer: To increase
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

Answer: Long 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

Answer: Strain type
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

Answer: Charging 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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