Basic Transmission and Distribution MCQ - Set 07 - ObjectiveBooks

# Practice Test: Question Set - 07

1. When an alternator connected to the bus-bar is shut down the bus-bar voltage will
(A) Fall
(B) Rise
(C) Remain unchanged
(D) None of the above

2. The current drawn by the line due to corona losses is
(A) Non-sinusoidal
(B) Sinusoidal
(C) Triangular
(D) Square

3. A feeder, in a transmission system, feeds power to
(A) Distributors
(B) Generating stations
(C) Service mains
(D) All of the above

4. The minimum clearance between the ground and a 220 kV line is about
(A) 4.3 m
(B) 5.5 m
(C) 7.0 m
(D) 10.5 m

5. The voltage of the single phase supply to residential consumers is
(A) 110 V
(B) 210 V
(C) 230 V
(D) 400 V

6. The corona is considerably affected by which of the following?
(A) Size of the conductor
(B) Shape of the conductor
(C) Surface condition of the conductor
(D) All of the above

7. If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as
(A) Kelvin's law
(B) Ohm's law
(C) Kirchhoff’s law

8. The operating voltage of extra high tension cables is upto
(A) 6.6 kV
(B) 11 kV
(C) 33 kV
(D) 66 kV

9. The material generally used for armour of high voltage cables is
(A) Aluminium
(B) Steel
(C) Brass
(D) Copper

10. Which of the following bus-bar schemes has the lowest cost?
(A) Ring bus-bar scheme
(B) Single bus-bar scheme
(C) Breaker and a half scheme
(D) Main and transfer scheme

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