Power Systems Objective Questions & Answers – Set 17

A 3 core cable gives on test a capacitance of 3.7 µF between two cores. Find the line charging current of the cable when it is connected to 11 kV, 50 Hz system?

A hydro electric generating station is supplied from a reservoir of capacity 5 × 10 ^{− 6} cubic meters at a head of 200 meters. Find the total energy available in KWh if the overall efficiency is 75 %

Which of the following circuit breakers produce least arc energy?

What are the tests performed for oil-filled and gas-filled cables ?

How much KWh energy is produced by fission of 1 gm of uranium U₂₃₅

Which of following is a medium and low head turbines

The conductor of a 10 Km long single phase, two wire line are separated by a distance of 1.5 m the diameter of each conductor the inductance of the circuit is

For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjust vanes is

Water hamming process in pen-stocks results in

A power station supplies the peak load of 50 MW, 40 MW and 70 MW to three localities. The annual load factor is 0.50 p.u. and the diversity factor of the load at the station is 1.55 the maximum demand on the station and average load respectively will be

Which of the following rotor is used in thermal power plants?

Length of the cable is doubled, its capacitance C will be

A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

Which of the following is a reaction turbines

When a transformer is loaded, the secondary terminal voltage gains. That means power factor is

Alternate formation and breakage of bubbles are called

Tarapur nuclear power plant has which type of reactor?

The arc voltage produced in an AC circuit breaker is always

In a 400 KV network, 360 KV is recorded at a 400 KV bus. The reactive power absorbed by shunt rated for 50 MVAr, 400 KV connected at the bus is

What are the methods of laying underground cables?

For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to

A thermal protection switch is used to provide protection against

String efficiency depends upon

Among the following which is not non conventional energy

Pelton wheel turbine is a

A generating station has a maximum demand of 50 MW a load factor of 60 %, a plant capacity factor of 45 % and if the plant while running as per schedule were fully loaded. The daily energy produced will be

When bundle conductor are used in place of single conductor the effective inductance and capacitance will respectively

The load duration curve for a system is 8 hours 30 MW, 16 hours 25 MW and 24 hours 20 MW. The load factor will be

For large plants of capacity for more than 15 MW, what type of cooling is used

Which of the following is an impulse turbine