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DFCCIL’21 EE: Daily Practice Quiz. 29-Sep-2021

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EXAM DATES
26 SEPT TO 30 SEPT

DFCCIL’21 EE: Daily Practices Quiz

DFCCIL’21 EE: Daily Practices Quiz 29-Sep-2021

Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 08 min.

Q1. Which diode exhibits negative resistance characteristics:
(a) LED
(b) PN diode
(c) Zener
(d) Tunnel diode

Q2. If both the number of turns and core length of an inductive coil are doubled, then its self-inductance will be
(a) Halved
(b) Doubled
(c) Quadrupled
(d) Unaffected

Q3. An alternating current given by i =14.14 sin⁡〖(ωt+π/6)〗 has an r.m.s. value of
(a) 1.96 A
(b) 7.07 A
(c) 10.0 A
(d) 14.14 A

Q4. Overlapping of conduction band and valence band occurs in
(a) Conductors only
(b) Semiconductors only
(c) Insulators only
(d) Conductors and semiconductors both

Q5. The pressure coil of an energy meter is…….
(a) Purely resistive
(b) Purely inductive
(c) Highly resistive
(d) Highly inductive

Q6. In DC compound Motor the shunt field and series field winding are made up of _________ & ____________ respectively
(a) High Resistance, Low Resistance
(b) Low Resistance, High Resistance
(c) Equal Resistance
(d) None of the above

SOLUTIONS

S1. Ans.(d)
Sol. Tunnel diode exhibits negative resistance characteristics.

S2. Ans.(b)
Sol. Self-inductance(L)=(μ0 μr AN^2)/l
If both the number of turns and core length of an inductive coil are doubled,
Then L^’=(μ0 μr A(2N)^2)/2l=2L.

S3. Ans.(c)
Sol. irms=im/√2=14.14/1.414=10 A

S4. Ans.(a)
Sol. overlapping of conduction and valence band occurs in conductors only.
DFCCIL 2021,DFCCIL ELECTRICAL QUIZ, |_30.1

S5. Ans.(d)
Sol. The pressure coil of an energy meter is highly inductive while for wattmeter it is highly resistive.

S6. Ans.(a)
Sol. In DC compound Motor:
The shunt-winding is made up of wires of small cross-sections and has high resistance and the series winding will carry a large armature current and therefore it is made of wires of large cross-section and has a few turns only.

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