EE review

1. The temperature coefficient of a metal as the temperature increases will __________

Answer explanation

We know that the temperature coefficient is,
Given by, α = α0/1+α0t
Since temperature is present at the denominator, so with increase in temperature t, the denominator increases and hence the fraction decreases.
So, temperature coefficient decreases.

Given a wire of resistance R Ω. The resistance of a wire of the same material and same weight and double the diameter is ___________

The star equivalent resistance of 3 resistors having each resistance = 5 Ω is ____________

The charge associated with a bulb rated as 20 W, 200 V and used for 10 minutes is ____________

For a series RL circuit having L = 5 H, current = 1 A (at an instant). The energy stored in magnetic field is ___________

For a practical voltage source, which of the following is correct?

• Cannot be less than source voltage

• Cannot be higher than source voltage

• Is always less than source voltage

• Is always equal to source voltage

Consider an electric motor having resistance of 10 Ω, 20 Ω and 30 Ω respectively. The percentage of energy dissipated by 10 Ω earthing plate is ____________

• a) More than 50% of total energy

• b) Less than 50% of total energy
  

• c) Depends on the materials of the three plates
  

• d) May be more or less than 50% of total energy

Consider a resistive network circuit, having 3 sources of 18 W, 50 W and 98 W respectively and a resistance R. When all source act together the maximum and minimum power is ____________

In the circuit given below the maximum power that can be transferred from the source voltage is __________

A current waveform is of the shape of a right angled triangle with period of t = 1 sec. Given a resistance R = 1 Ω. The average power is __________