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

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1. Which of the following is the dimensional formula of conductance?




... Answer is C)
[Conductance = 1 / resistance]....
[Resistance = Voltage / current]....
(voltage dimension = W/Q =M$L^2$$T^-2$/IT =ML$T^-3$$I^-1$)
[Resistance dimension = ML$T^-3$$I^-1$/I =ML$T^-3$$I^-2$].....
[conductance dimension= 1/R = 1 / ML$T^-3$$I^-2$ = $M^-1$$L^-2$$T^3$$I^2$]




2. Which one of the following statement is TRUE about the resistance of a conductor?




... Answer is D)
Resistance formula is: R = ?L/A
Where: ?: Resistivity constant of the material, in O.m.
L: Length of the wire, in meter.
A: Cross sectional area of the wire, in m^2


3. In parallel combination of resistance, the voltage is.......?




... Answer is C)

The voltage across each resistor within a parallel combination is exactly the same
but the currents flowing through them are not the same as this is determined by their resistance value and Ohms Law. Then parallel circuits are current dividers.

4. Electrical conductivity of a conductor is measured in........




... Answer is C)
A mho per meter (mho/m) is an older unit of electrical conductivity (also known as specific conductance). The mho is the reciprocal of the ohm. Though siemens was introduced in the late 1970s, this unit can still be found in some old measurement instruments. 1 mho/m = 1 S/m.

5. What will be the equivalent capacitance of a parallel combination of four capacitors having equal value of capacitance 'C'?




... Answer is B)
When capacitors are connected in parallel, the total capacitance is the sum of the individual capacitors' capacitance's.

6. What will be the potential difference (in V) between the ends of a conductor when the current flowing through the conductor is 3 A and the value of conductance is 0.3 mho?




... Answer is A)
[we have current I=3Amp, conductance G=.3 mho] [Then R = 1/G =1/0.3 = 3.33 ohm] [So potential difference = IR =3*3.33 = 9.99 V] [ Almost 10 V] .

7. Determine the value of charge stored (in mC) in a capacitor, when the value of capacitance is 0.01 mF and the potential difference between the ends of the capacitor is 20 V.




... Answer is A)
[ C =0.01 mF = 0.01*10-3 F ]

[ Chagre Q = CV ]
[ Charge Q = 0.01*10-3 * 20 ]
[ Charge Q = 0.2* 10-3 coulomb ] [ charge = .2 mili Coulomb ] .

8. Determine the value of current (in A) drawn from a 8V battery, when a wire of 24 ohms resistance is stretched doubled its original length and then cut into two equal parts and these equal are connected in parallel with the battery?




... Answer is A)
[New resistance of wire after stretched double in lenght R = n*n (old resistance befour stetching )]
[ R = 2 * 2 * 24 ] = 4*24 = 96 ohm ] [ now 96 ohm cut in two parts and connected in parallel (48 parallel with 48) then equivalent resistance = 24 ohm]

[ so current I = V/R = 8/24 = 0.33A] .

9. Determine the heat (in joules) dissipated through a resistor of 15 ohms resistance, when 0.5 A of current is flowing through the resistor for 8 seconds.




... Answer is B)
[Current I =0.5A ]
[Time t = 8 second]
[Resistance r r = 15ohm ]
[Heat dissipated = $I^2$*R *t = 0.5*0.5*15*8 = 30 Joules

10. What will be the color-coding of a resistor when the resistance of the resistor is 15 ohms?




... Answer is D)
[ Resistance R = A B * 10c +- Tollerance ]
[R = 15 ohm ]
for detailed exp watch the video .





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