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This mock test of Basic And Electric Circuits - 1 for Electrical Engineering (EE) helps you for every Electrical Engineering (EE) entrance exam.
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QUESTION: 1

If the power supplied by the 20 V voltage source shown in figure below is 60 W then, the power supplied by the unknown circuit element (x) will be

Solution:

we know that

QUESTION: 2

In the network of figure shown below, I_{1} = 0.05 A, I_{2} = 0.1 A , R = 50 Ω. The unknown current source has strength of* i*, If 100 J of energy is delivered to I_{2} in 1 min, the magnitude of *i* will be

Solution:

energy dissipated in where p=vi

Since power is constant, therefore

Applying KCL at node v, we have

QUESTION: 3

The energy required to move 120 C charge through 3 V is

Solution:

W=QV=120 X 3 = 360J

QUESTION: 4

For a given voltage, four heating coils will produce maximum heat, when connected

Solution:

Maximum heat produced is

for P to be maximum, R_{eq} should be minimum which is minimum of all four coils are connected in parallel.

QUESTION: 5

Given figure shows a plot of d.c. voltage applied to a resistor of 5 Ω for 15 seconds. The total energy consumed by the resistor is

Solution:

energy = power x time

Hence, the heat consumed by the resistor

= 1140 J

QUESTION: 6

The charge in a capacitor is given by

if the voltage across this capacitor be v(t) = sin t, the current i(t) through the capacitor is

Solution:

The current through.the capacitor is

QUESTION: 7

The unit of reactive power is

Solution:

Active **power** does do work, so it is the real axis. **The unit** for **power** is the watt (symbol: W). **Apparent power** is often expressed in volt-amperes (VA) since it is the product of rms voltage and rms current. **The unit** for **reactive power** is var, which stands for volt-ampere **reactive**.

QUESTION: 8

The unit of electrical energy is

Solution:

QUESTION: 9

The given signal is

Solution:

Given signal is a ramp signal f(t) = A(t), which is neither an energy signal nor a power signal.

QUESTION: 10

The two voltage sources connected in parallel as shown below, must satisfy the conditions

Solution:

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