DC Circuits - Electrical Engineering (MCQ) questions and answers

1)   If a current of 5A flows through a resistor of 12 ohm then the power developed and the energy dissipated in 2 minutes are

a. 300 W, 36000 J
b. 360 W, 30000 J
c. 380 W, 35000 J
d. 380 W, 36000 J
Answer  Explanation 

ANSWER: 300 W, 36000 J

Explanation:
No explanation is available for this question!
2)   If a number of resistors are connected in parallel, then the reciprocal of total resistance is equal to

a. Sum of individual resistances
b. Sum of the reciprocal of individual resistances
c. Reciprocal of the sum of individual resistances
d. All of these
Answer  Explanation 

ANSWER: Sum of the reciprocal of individual resistances

Explanation:
No explanation is available for this question!
3)   Electrical work is

a. Directly proportional to the potential difference
b. Directly proportional to the charge
c. Directly proportional to the current
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
4)   According to Kirchoff’s voltage law,

a. The algebraic sum of all the e.m.f’s in the circuit is zero
b. Algebraic sum all the voltage drops in the circuit is zero
c. Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero
d. All of these
Answer  Explanation 

ANSWER: Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero

Explanation:
No explanation is available for this question!
5)   One coulomb of charge is equal to the charge of

a. 1.095 x 10 –19 electrons
b. 1.625 x 10–31 electrons
c. 6.242 x 1018 electrons
d. 6.025 x 10–19 electrons
Answer  Explanation 

ANSWER: 6.242 x 1018 electrons

Explanation:
No explanation is available for this question!
6)   In any network of wires carrying currents, the algebraic sum of all currents meeting at a point is equal to

a. Sum of all the currents
b. Zero
c. Sum of outgoing current
d. Sum of incoming current
Answer  Explanation 

ANSWER: Zero

Explanation:
No explanation is available for this question!
7)   The unit of electrical energy is / are

a. Joules
b. Watt - sec
c. Kilowatt - hour
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
8)   Which among the following is true about ohm’s law?

a. I ∝ V
b. I = V/R
c. V = IR
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
9)   Specific resistance of a material is

a. Directly proportional to the both area of cross section and length of material
b. Directly proportional to the area of cross section and inversely proportional to the length of material
c. Inversely proportional to the area of cross section and directly proportional to the length of material
d. Inversely proportional to the both area of cross section and length of material
Answer  Explanation 

ANSWER: Directly proportional to the area of cross section and inversely proportional to the length of material

Explanation:
No explanation is available for this question!
10)   In half wave rectifiers, diode conducts during

a. Only positive half cycle
b. Only negative half cycle
c. Both positive and negative half cycle
d. Neither in positive half cycle nor in negative half cycle
Answer  Explanation 

ANSWER: Only positive half cycle

Explanation:
No explanation is available for this question!

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