Electrical Power Transmission

The main objectives of electrical power transmission is/are

• Transmission system must be more efficient with minimum line losses

• Voltage regulation of the transmission line must be zero or minimum

• both 1 and 2

• nether 1 nor 2

Advantages of higher transmission voltage is/are

• Power transfer capability of the transmission line is increased

• Transmission line losses are reduced

• Area of cross section and volume of the conductor is reduced

• all of the above

Transmission efficiency increases as

• voltage increases but power factor decreases

• voltage and power factor both decrease

• voltage and power factor both increase

• voltage decreases but power factor increases

Maximum power transfer capability of transmission line can be increased by

• Parallel transmission lines

• Using series capacitance

• Using bundled conductors

• all of the above

In overhead transmission lines the effect of capacitance can be neglected when the length of line is less than

• 200 km

• 160 km

• 100 km

• 80 km

Which of the following transmission line have more initial cost

• Overhead Transmission

• Underground transmission

• Both have almost the same initial cost

• None of the above

Which of the following materials are not used for the transmission and distribution of electrical power

• Copper

• Aluminium

• Tungsten

• Steel

Which of the following are the constants of the transmission line

• Inductance

• Capacitance

• Resistance

• Conductance

• All of the above

The disadvantage of constant voltage transmission is

• short circuit current of the system is increased

• load power factor in heavy loads

• large conductor area is required for same power transmission

• air of the above