- 1. The stringing charts are used for
- 2. The permissible voltage variation in transmission and distribution system is
- 3. Bad weather conditions such as rain sleet
- 4. In order to lower cost of electrical generation,
- 5. Skin effect of a conductor will reduce as
- 6. In a 3 phase system, the area of cross section of the neutralis generally
- 7. Number of insulator discs, each rated 11 kV, required in a suspension type insulator string for 66 kV line is
- 8. Earth wire on EHV overhead transmission line is provided to protect the line against
- 9. For transmission line, which one of the following relation is true?
- 10. The inductance of a transmission line is minimum when
- 11. For a 500 Hz Frequency excitation, a 50 km long power line will be modelled as
- 12. HVDC transmission is preferred to EHV AC because
- 13. If X is the system reactance and Rits resistance, the power transferred is maximum when
- 14. A single phase transmission line of impedance 0.8 supplies aresistive load of 500 A at 300 V. The sending power factor is
- 15. The power generated by two plants are; P1 = 50 MW, P2 = 40 MW. If the loss coefficients are B11 = 0.0025, B12 = -0.0005, then the power loss will be
- 16. Which of the following is a series FACTS device?
- 17. The function of shunt reactor is
- 18. For a 5 Hz Frequency excitation, a 400 km long power line will be modelled as
- 19. In AC transmission line system there is difference in phase voltage at the two ends of line due to
- 20. Chandrapur-Padghe HVDC Line is operated by
- 21. Nationwide synchronous power grid, interconnecting all the five regional grids, has been established in
- 22. Which of the following forms of energy has a long-term [next 50 years) estimated availability?
- 23. The power transmission capability of bipolar lines is approximately
- 24. The low power factor of an industrial plant is uneconomical for
- 25. A thermal generating station has installed capacity of 15 MW and supplies a load of 10 MW for 12 hours and 5 MW For remaining 12 hours. The plant capacity factor for this station is
- 26. Series reactors are used to
- 27. The voltage regulator having dead zero effect is
- 28. Static voltage regulators are
- 29. Shunt capacitors in sub stations
- 30. The number of insulator discs (each rated 11 kV) required in a suspension type insulator string of 220 kV line is
1. The stringing charts are used for
A Finding the sag and tension in the conductorB Finding the distance between the towers
C Design of insulator string
D Design of tower
Answer: A Finding the sag and tension in the conductor
2. The permissible voltage variation in transmission and distribution system is
A ± 0.1%
B ± 1%
C ± 10%
D ± 25%
ANSWER: C ± 10%
A Increases the corona loss
B Makes corona loss zero
С Decreases the corona loss
D Does not affect the corona loss
Answer: A Increases the corona loss
A The load factor should be low and diversity the factor should be high
B The load factor should be high and diversity factor should be low
C The load factor and diversity factor should be high
D The load factor and diversity factor should be low
Answer: D The load factor and diversity factor should be low
A The diameter increases
B Frequency increases
C Permeability of the conductor material increases
D Resistivity of the conductor material increases
Answer: D Resistivity of the conductor material increases
A Same as that of the outer conductors
B Half of the outer conductors
C Quarter of the Oputer conductors
D Double of the outer conductors
Answer: B Half of the outer conductors
A 6
B More than 6
C 12
D Less than 6
Answer: D Less than 6
A Lightning surge
B Switching surge
C Excessive fault voltages
D corona effect
Answer: A Lightning surge
A AD - BC = 1
B AD- BC = 1
C AD - BC = 0
D AD - BC = 3
Answer: A AD - BC = 1
A GMD is high
B GMR is high
C Both GMD and GMR are high
D GMD is low and GMR is high
Answer: A GMD is high
A short line
B medium line
C long line
D data insufficient for decision
Answer: C long line
A HVDC terminal equipment are inexpensive
B VAR compensation is not required in HVDC system
C System stability can be improved
D Harmonic problem is avoided
Answer: C System stability can be improved
A X=R
B X = root of R
C X = root of 3R
D X = 2R
Answer: C X = root of 3R
A unity
B 0.8 lagging
C 0.8 leading
D 0.6 lagging
Answer: D 0.6 lagging
C ± 10%
D ± 25%
ANSWER: C ± 10%
3. Bad weather conditions such as rain sleet
A Increases the corona loss
B Makes corona loss zero
С Decreases the corona loss
D Does not affect the corona loss
Answer: A Increases the corona loss
4. In order to lower cost of electrical generation,
A The load factor should be low and diversity the factor should be high
B The load factor should be high and diversity factor should be low
C The load factor and diversity factor should be high
D The load factor and diversity factor should be low
Answer: D The load factor and diversity factor should be low
5. Skin effect of a conductor will reduce as
A The diameter increases
B Frequency increases
C Permeability of the conductor material increases
D Resistivity of the conductor material increases
Answer: D Resistivity of the conductor material increases
6. In a 3 phase system, the area of cross section of the neutralis generally
A Same as that of the outer conductors
B Half of the outer conductors
C Quarter of the Oputer conductors
D Double of the outer conductors
Answer: B Half of the outer conductors
7. Number of insulator discs, each rated 11 kV, required in a suspension type insulator string for 66 kV line is
A 6
B More than 6
C 12
D Less than 6
Answer: D Less than 6
8. Earth wire on EHV overhead transmission line is provided to protect the line against
A Lightning surge
B Switching surge
C Excessive fault voltages
D corona effect
Answer: A Lightning surge
9. For transmission line, which one of the following relation is true?
A AD - BC = 1
B AD- BC = 1
C AD - BC = 0
D AD - BC = 3
Answer: A AD - BC = 1
10. The inductance of a transmission line is minimum when
A GMD is high
B GMR is high
C Both GMD and GMR are high
D GMD is low and GMR is high
Answer: A GMD is high
11. For a 500 Hz Frequency excitation, a 50 km long power line will be modelled as
A short line
B medium line
C long line
D data insufficient for decision
Answer: C long line
12. HVDC transmission is preferred to EHV AC because
A HVDC terminal equipment are inexpensive
B VAR compensation is not required in HVDC system
C System stability can be improved
D Harmonic problem is avoided
Answer: C System stability can be improved
13. If X is the system reactance and Rits resistance, the power transferred is maximum when
A X=R
B X = root of R
C X = root of 3R
D X = 2R
Answer: C X = root of 3R
14. A single phase transmission line of impedance 0.8 supplies aresistive load of 500 A at 300 V. The sending power factor is
A unity
B 0.8 lagging
C 0.8 leading
D 0.6 lagging
Answer: D 0.6 lagging
Load impedance Z= R = V/1 = 0.6
Line impedance = 0.8 (inductive)
Total impedance from sending = 0.6+j0.8
Power factor = R/Z= 0.6/1 = 0.6 lag
15. The power generated by two plants are; P1 = 50 MW, P2 = 40 MW. If the loss coefficients are B11 = 0.0025, B12 = -0.0005, then the power loss will be
A 5.5 MW
B 6.5 MW
С 4.5 MW
D 8.5 MW
Answer: С 4.5 MW
16. Which of the following is a series FACTS device?
А TCSC
B SVC
C STATCOM
D None of these
Answer : А TCSC
17. The function of shunt reactor is
A to control the steady state over voltage when line is lightly loaded
B to improve the transfer capability of the line
C to limit short circuit current
D None of these
Answer: A to control the steady state over voltage when line is lightly loaded
18. For a 5 Hz Frequency excitation, a 400 km long power line will be modelled as
A long line
B short line
C medium line
D data insufficient for decision
Answer: B short line
19. In AC transmission line system there is difference in phase voltage at the two ends of line due to
A earthing of line
B system voltage
C insulators
D reactance of line
Answer: D reactance of line
20. Chandrapur-Padghe HVDC Line is operated by
А MSEB
B PGVCL
C PGCIL
D Govt. Of india
Answer: А MSEB
21. Nationwide synchronous power grid, interconnecting all the five regional grids, has been established in
A 2013
B 2014
C 2015
D 2012
Answer: A 2013
22. Which of the following forms of energy has a long-term [next 50 years) estimated availability?
A Low-temperature heating from solar energy
B Synthetic oil and alcohols from coal
C Photovoltaic production of electricity
D Coal
Answer: C Photovoltaic production of electricity
23. The power transmission capability of bipolar lines is approximately
A half that of 3-phase single circuit line
B the same as that of 3-phase single circuit line
C twice that of 3-phase single circuit line
D thrice that of 3-phase single circuit line
Answer: B the same as that of 3-phase single circuit line
24. The low power factor of an industrial plant is uneconomical for
A electric supply utility only
B owner of the plant only
C both the owner of the plant and electric supply utility
D either [A] or [B]
Answer: C both the owner of the plant and electric supply utility
25. A thermal generating station has installed capacity of 15 MW and supplies a load of 10 MW for 12 hours and 5 MW For remaining 12 hours. The plant capacity factor for this station is
A 0.5
B 0.67
C 0.75
D 1
Answer: A 0.5
26. Series reactors are used to
A improve voltage regulation
B improve the PF
C improve the transmission efficiency
D bring down the fault level within the capacity of switchgear
Answer: D bring down the fault level within the capacity of switchgear
27. The voltage regulator having dead zero effect is
A maganetic amplifier
B electronic
C electromagnetic
D none of these
Answer: C electromagnetic
28. Static voltage regulators are
A transistors
B integrated circuits
C microprocessors
D all of these
Answer: D all of these
29. Shunt capacitors in sub stations
A consume lagging VAR
B deliver lagging VAR
C consume active power
D deliver active power
Answer: B deliver lagging VAR
30. The number of insulator discs (each rated 11 kV) required in a suspension type insulator string of 220 kV line is
A 20
B 22
C 12
D 16
Answer: D 16