The power transmitted will be maximum when____________?

Which of the following D.C. distribution system is the simplest and lowest in first cost ?

A. Radial system
B. Ring system
C. Inter-connected system
D. None of the above

Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system ?

A. Circulating current method
B. Thevenin’s theorem
C. Superposition of currents
D. Direct application of Kirehhoffs laws
E. All of the above

Which of the following materials is used for overhead transmission lines ?

A. Steel cored aluminium
B. Galvanised steel
C. Cadmium copper
D. Any of the above

Constant voltage transmission entails the following disadvantage?

A. large conductor area is required for same power transmission
B. short-circuit current of the system is increased
C. either of the above
D. none of the above

Owing to skin effect:

A. current flows through the half cross-section of the conductor
B. portion of the conductor near the surface carries more current and core of the conductor carries less current
C. portion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent
D. any of the above
E. none of the above

For an overhead line, the surge impedance is taken as________________?

A. 20-30 ohms
B. 70—80 ohms
C. 100—200 ohms
D. 500—1000 ohms
E. none of the above