WBSETCL JE 2021, WBSETCL JE ELECTRICAL QUIZ |_00.1
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WBSETCL-JE’21 EE: Daily Practices Quiz 27-Dec-2021

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WBSETCL JE QUIZ: EE

WBSETCL-JE’21 EE: Daily Practices Quiz 27-Dec-2021

Each question carries 1 mark.
Negative marking: NO NEGATIVE MARKING
Total Questions: 06
Time: 06 min.

Q1. A capacitor is generally a:
(a) Bilateral and active component
(b) Active, passive, linear and non-linear component
(c) Linear and bilateral component
(d) Non-linear and active component

Q2. Materials exhibiting zero value of resistivity are known as………
(a) Conductors
(b) Semiconductors
(c) Insulators
(d) Superconductors

Q3. Bulbs in street lighting are all connected in:
(a) Parallel
(c) Series-parallel
(b) Series
(d) End-to-end

Q4. Under heavy loads, transformer efficiency is comparatively low because
(a) Secondary output is much less as compared to primary input
(b) Voltage drops both in primary and secondary become large
(c) Iron loss is increased considerably
(d) Copper loss becomes high in proportion to the output

Q5. The short circuit test in a transformer is used to determine……
(a) Eddy current
(b) Hysteresis loss
(c) Copper loss at any load
(d) Iron loss at any load

Q6. Two coils with self-inductances 1 H and 2 H having a mutual inductance of 1 H between them carry currents of 2 A and √2 A respectively. The energy stored in the field, in joules, is
(a) 2(1+√2)
(b) 3(1+√2)
(c) 2(2+√2)
(d) 3(2+√2)

SOLUTIONS

S1. Ans.(c)
Sol.
Linear Elements are the elements that show a linear relationship between voltage and current. Examples: Resistors, Inductors, and capacitors and linear dependent sources.
Bilateral Elements are the elements that allow the current in both directions and offer the same impedance in either direction of current flow. Examples: Resistors, Inductors and capacitors.

S2. Ans.(d)
Sol. Superconductors

S3. Ans.(a)
Sol. Street light and all lights in a house or in the industry are connected in parallel because if we connect it in series voltage across each light will drop hence it will glow less than its rated lumen. So, to maintain rated voltage across each light we have to connect it in parallel.

S4. Ans.(d)
Sol.
At high load, copper loss increases as P_c α I^2 (Where; I=load current)
Due to increased copper loss, efficiency decreases.

S5. Ans.(c)
Sol. SC test of transformer:
Used to determine copper loss or ohmic loss
LV side short circuited
Instruments kept on HV side
Also determines equivalent resistance and leakage reactance

WBSETCL JE 2021, WBSETCL JE ELECTRICAL QUIZ |_40.1

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