Electronics (Phys-3502) Mid-Exam

Three resistors of 3Ω are connected in parallel. So, what will be the equivalent resistance?

• 9Ω

• 6Ω

• 3Ω

• 1Ω

The drift speed of the electrons in the wire is 3m/s when the current is 3A. What is the drift speed in the wire, when the current is 9A?

• 3m/s

• 6m/s

• 9m/s

• 27m/s

How much work is required to move a -500μC charge across a potential difference of 300V?

• 1.67J

• 0.6J

• 800J

• 0.15J

To determine the polarity of the voltage drop across a resistor, it is necessary to know

• Value of current through the resistor

• direction of current through the resistor

• Value of resistor

• Value of e.m.fs. in the circuit

While determining RTh in Thevenin’s and Norton’s equivalent

• only current sources are made dead

• only voltage sources are made dead

• all independent sources are made dead

• all current and voltage sources are made dead

Which of the following is an active element in a circuit?

• Current source

• Resistance

• Inductance

• Capacitance

In mesh analysis, if there are N meshes in the circuit, then how many equations will be written to solve the network?

• N – 1

• N

• N + 1

• N – 2

A Y- arrangement of resistors has each resistance of 3 Ω. The equivalent ∆- arrangement will have each resistance of values

• 9 Ω

• 6 Ω

• 3 Ω

• 1 Ω

According to Kirchhoff s voltage law, the algebraic sum of all IR drops and EMFs in any closed loop of a network is always?

• negative

• positive

• zero

• determined by emfs of the batteries

What is the value of i3 from the figure below?