SSC JE Electrical Important MCQ Part 18
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Attempt Free SSC JE Electrical Important MCQ Part 18 Here. Read The Important SSC MCQ From Below.
SSC JE Electrical Important MCQ PDF Part 18
1.How much voltage will be measured across the resistor in Figure
A.280 V
B.280 mV
C.400 V
D.56 mV
Answer : B (V= IR =5 mA×56 Ohms=5×10⁻³×56 = 280 mV)
2.An alternating voltage is represented by the expression v=35 sin(314.2 t ) volt.The period of the waveform is
A.50 ms
B.20 ms
C.50 s
D.20 s
Answer : B
(v=35 sin(314.2t) volt and comparing this to the standard v=Vm sin (2πft) volt we get 2πft=314.2
So f=314.2/2π=50 Hz
T=1/f=1/50 second=20 ms)
SSC JE Electrical Important MCQ Part 18
3.A sinusoidal alternating voltage has an average value of 3.5 V and a period of 6.67 ms.The standard expression for voltage will be
A.v=3.5 sin(314.2t)
B.v=5.5 sin(300πt)
C.v=5.5 sin(94.2t)
D.v=3.5 sin(30πt)
Answer : B
(Vav=3.5 V,T=6.67×10⁻³ s
Vav=0.637 Vm
So Vm=Vav/0.637=3.5/0.367=5.5 V
f=1/T=1/6.67×10⁻³ Hz=150 Hz
The standard expression is of the form v=Vm sin (2πft) volt
v=5.5 sin(2π×150×t)
v=5.5 sin(300πt) volts )
4.A non-sinusoidal waveform has a peak factor of 2.5, and an r.m.s. value of 240 V,The maximum value of voltage is
A.1.414 V
B.200 V
C.600 V
D.240 V
Answer : C (Peak factor=maximum value/r.m.s. value So maximum value Vm= Peak factor×r.m.s.=2.5×240=600 V)
SSC JE Electrical Important MCQ Part 18
5.A battery of emf 6 V has an internal resistance of 0.15 ohms .What is its terminal p.d. when delivering a current of 0.5 A
A.5.925 V
B.6.000 V
C.4.000 V
D.7.075 V
Answer : A (E=6 V,r=0.15 ohms,V=E-Ir=6-(0.5*0.15)=6-0.075=5.925 V)
6.A current of 200 mA flows through a resistance of 750 ohms for a time of 5 minutes,What is the energy dissipated
A.90 kJ
B.9 kJ
C.800 J
D.80 kJ
Answer : B (W=I²Rt=0.2×750×300=9000 J or 9 kJ)
7.A resistor of 680 ohms, when connected in a circuit, dissipates a power of 85 mW. Then current flowing through it
A.7.6 A
B.7.6 mA
C.11.18 mA
D.11.18 A
Answer : C (P=I²R So I=√P/R=√85×10⁻³/680=√1.25×10⁻⁴=11.18 mA)
SSC JE Electrical Important MCQ Part 18
8.Symbol shown in figure of
A. Resistor
B. Potentiometer
C. Rheostat
D.SPDT switch
Answer : B (A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat)
9.Through which resistor in Figure is there always current, regardless of the position of the switches
A.R₁
B.R₃
C.R₅
D.R₆
Answer : C
SSC JE Electrical Important MCQ Part 18
10.The value of R₄ in the circuit of Figure is
A.56 Ω
B.56 kΩ
C.90 kΩ
D.90 Ω
Answer : B
(From the ohmmeter reading, R total=146 kΩ
RT=R₄+R₁ + R₂ + R₃)
R₄ = RT – (R₁ + R₂ + R₃) = 146 kΩ – (10 kΩ + 33 kΩ + 47 kΩ) = 56 kΩ)
11.In three-phase transformer, maximum voltage regulation occurs at____________
A. Unity power factor
B. Rated KVA of transformer
C. Leading power factor
D. Lagging power factor
Answer : D
SSC JE Electrical Important MCQ Part 18
12.In three phase star connection, line current is equal to _____________
A. Phase current
B. Phase current/√3
C. Phase voltage
D. Phase voltage/√3
Answer : A
13.The resistance of shunt field 250 V DC shunt generator is 200 ohms. What will be the field current
A.0 .8 Amps
B.4.5 Amps
C.1.25 Amps
D.5 Amps
Answer : C (If=250/200=1.25 Amps )
14.In DC generator, armature is laminated to reduce _______
A. Field flux
B. Copper loss
C. Eddy current loss
D. Differentially compound generator
Answer : C
SSC JE Electrical Important MCQ Part 18
15.The 3 phase transformer used to transmit the voltage is connected in ——–
A. Star – Star
B. Delta – Delta
C. Delta – Star
D. Star – Delta
Answer : C (Delta-Star transformers are common in commercial, industrial, and high-density residential locations, to supply three-phase distribution systems)
16.__________ relay is connected in the pipe connecting main tank of transformer and conservator.
A. Overcurrent
B. Distance
C. Buchholz
D. Directional
Answer : C
17.What is the full form of XLPE Cable
A. Externally linked PVC ethylene
B. Cross linked poly ethylene
C. Externally linked poly ethylene
D. Cross linked PVC ethylene
Answer : B
SSC JE Electrical Important MCQ Part 18
18.Energy meter is an example for which type of instrument
A. Pneumatic type
B. Recording type
C. Indicating type
D. Integrating type
Answer : D (The integrating instrument measures the total energy supplied by the circuit in a given interval of time)
19.__________ is used for high switching frequency application.
A.TRIAC
B.MOSFET
C.SCR
D. Diode
Answer : B
20.Which stepper motor gives high torque and low angular resolution
A. Variable resistance stepper motor
B. Variable reluctance stepper motor
C. Permanent magnet stepper motor
D. Variable inductance stepper motor
Answer : C (The Permanent Magnet stepper motor produces more torque than the Variable Reluctance Stepper Motor, They have higher inertia and therefore, lower acceleration than variable stepper motors)
SSC JE Electrical Important MCQ Part 18
