SSC Junior Engineer Electrical Online Exam 2018 CPWD/CWC/MES Electrical Engineering 22-01-2018 Morning2

11. Which one of the following statement is TRUE about the Kirchhoff's voltage law?

A) The algebraic sum of all the voltage around any closed path is
B) The algebraic sum of all the voltages around any closed path is negative.
C) The algebraic sum of all the voltages around any closed path is one.
D) he algebraic sum of all the voltages around any closed path is zero.

... Answer is D)
he algebraic sum of all the voltages around any closed path is zero.

12. Which one of the following is the CORRECT statement for superposition theorem?

A) The algebraic sum of all the voltages around any closed path is
B) The overall current in any part of a linear circuit is equal to the algebraic sum of the currents produced by each source separately.
C) The sum of currents entering a node is equal to the sum of currents leaving the node.
D) The algebraic sum of all the voltages around any closed path is equal to one.

... Answer is B)
The overall current in any part of a linear circuit is equal to the algebraic sum of the currents produced by each source separately.

13. Which one of the expression satisfies the condition of maximum power transfer theorem?

A) ZL = ZS
B) ZL = RL
C) ZL = 2ZS
D) XL = RL

... Answer is A)
maximum power transfer theorem.

14. Determine the value of current (in A) that flows through a resistor of 9 ohms, when the potential difference between the ends of the resistor is 36 V.

A) 8
B) 7
C) 4
D) 3

... Answer is C)
Resistance R = 9 ohm
voltage V = 36 V

SO current I = V/R = 36/9 = 4A
.

15. What will be the value of load impedance (in ohms) for transmitting maximum power from the source to load when the source impedance is 8 + j4 ohms?

A) 8 – j4
B) 8 + j4
C) 4 + j8
D) 4 – j8

... Answer is A)
source impedance = 8 + j4
load impedance =?
Condition for maximum power transfer..
Load impedance = (Source impedance)* = (8 + j4)* = 8 – j4
.

16. Determine the value of current (in A) drawn from the voltage source for the electrical circuit given below.

A) 4
B) 3.5
C) 2.5
D) 1.6

... Answer is C)
I = V/ R eq.

17. Determine the load resistance (in ohms) for a circuit when the maximum power transferred from source of 80 V to the load is 80 W ?

A) 40
B) 20
C) 10
D) 5

... Answer is B)
P = 80 W
V = 80 V

Formula for maximum power transfer to the load is P = Vth * Vth / 4 Rth

Rth = 80*80/4*80 = 20 ohm
.

18. Determine the Norton's resistance (in ohms) between terminals A and B for the circuit given below?

A) 5.8
B) 4.8
C) 3.8
D) 1.8

... Answer is B)
Norton resistance and thevenin resistance are equal. For thevenin resistance calculation we know fist open the terminal which across Rth need to calculate than replace independent source to their internal resistance.

.

19. Determining the Thevenin's equivalent resistance (in ohms) across the terminal a and b for the electrical circuit given below?

A) 1
B) 0.5
C) 0.3
D) 0.2

... Answer is B)
R = 0.5.

20. Determine the value of current (in A) through 30 ohms resistor of the circuit given below?

A) 4
B) 3
C) 2
D) 1

... Answer is C)
I = 2amp.





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