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Basic Electrical Engineering MCQ

Q:

What happens to the current in the series circuit if the resistance is doubled?

A) It becomes half its original value B) It becomes double its original value
C) It becomes zero D) It becomes infinity
 
Answer & Explanation Answer: A) It becomes half its original value

Explanation: I=V/R. If R becomes 2R then I becomes I/2 i.e. half of its original value.

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739
Q:

If the peak to peak voltage is 10V, calculate the peak voltage.

A) 10V B) 2V
C) 4V D) 5V
 
Answer & Explanation Answer: D) 5V

Explanation: Vp-p=2Vp
Substituting the values from the question, we get Vp=5V.

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450
Q:

Thevenin resistance is found by ________

A) Shorting all voltage sources B) Opening all current sources
C) Shorting all voltage sources and opening all current sources D) Opening all voltage sources and shorting all current sources
 
Answer & Explanation Answer: C) Shorting all voltage sources and opening all current sources

Explanation: Ideal current sources have infinite internal resistance hence behave like an open circuit whereas ideal voltage sources have zero internal resistance hence behave as a short circuit.

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389
Q:

If 2V is supplied to a 3F capacitor, calculate the charge stored in the capacitor.

A) 1.5C B) 6C
C) 2C D) 3C
 
Answer & Explanation Answer: B) 6C

Explanation: Q is directly proportional to V. The constant of proportionality in this case is C, that is, the capacitance. Hence Q=CV.
Q=3*2=6C.

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368
Q:

If a voltage of 2+5j and another voltage of 3+ 6j flows through two different resistors, connected in series, in a circuit, find the total voltage in the circuit.

A) 2+5j V B) 3+6j V
C) 5+11j V D) 5+10j V
 
Answer & Explanation Answer: C) 5+11j V

Explanation: The total voltage in the circuit is the sum of the two voltages where we add the real parts and imaginary parts separately.
Therefore, Vtotal= 5+11j V.

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348
Q:

Which of the following statements are true with regard to resistance?

A) Resistance is directly proportional to a length of the wire B) Resistance is directly proportional to an area of cross section of the wire
C) Resistance is inversely proportional to the length of the wire D) Resistance is inversely proportional to the resistivity of the wire
 
Answer & Explanation Answer: A) Resistance is directly proportional to a length of the wire

Explanation: The expression for resistance is: Resistance=Resistivity*length of wire/ area of cross section of the wire. Hence resistance is directly proportional to length.

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339
Q:

KCL is applied at _________

A) Loop B) Node
C) Both loop and node D) Neither loop nor node
 
Answer & Explanation Answer: B) Node

Explanation: KCL states that the amount of charge leaving a node is equal to the amount of charge entering it, hence it is applied at nodes.

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282
Q:

In Norton?s theorem Isc is__________

A) Sum of two current sources B) A single current source
C) Infinite current sources D) 0
 
Answer & Explanation Answer: B) A single current source

Explanation: Norton?s theorem states that a combination of voltage sources, current sources and resistors is equivalent to a single current source IN and a single parallel resistor RN.

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