Power Systems
In a three-phase system, when the loads are perfectly balanced, the neutral current is

  one - third of minimum.
  two - thirds of maximum.
  one - third of maximum.
  zero.

ANSWER DOWNLOAD EXAMIANS APP

Power Systems
An hydro-graph indicates

All of these
 the average run off during the period.
 the discharge at any time during the period under consideration.
 the maximum and minimum run off during the period.

ANSWER DOWNLOAD EXAMIANS APP

Power Systems
An impulse turbine

 is most suited for low head and high discharge power plants.
 makes use of a draft tube.
  operates by initial complete conversion to kinetic energy.
 always operates submerged.

ANSWER DOWNLOAD EXAMIANS APP