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UPPCL-JE’21 EE: Daily Practices Quiz 24-Nov-2021

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UPPCL-JE’21 EE: Daily Practices Quiz

UPPCL-JE’21 EE: Daily Practices Quiz 24-Nov-2021

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

Q1. The unit of measurement for the slew rate of an op-amp is:
(a) volts/µsec.
(b) dB
(c) mA
(d) µV/sec

Q2. Insulators have ……………… temperature coefficient of resistance.
(a) Positive
(b) Negative
(c) Zero
(d) None of these

Q3. The commercial unit of electric energy is
(a) KVA
(b) KVh
(c) KWh
(d) None of these

Q4. The phase difference between the currents flowing in the primary and secondary windings of a transformer is
(a) 360⁰
(b) 180°
(c) 120°
(d) 90°

Q5. A fuse element should have
(a) Low melting point
(b) High melting point
(c) Very high melting point
(d) None of these

Q6. Nichrome wire is an alloy of
(a) Lead and zinc
(b) Chromium and vanadium
(c) Nickel and chromium
(d) Copper and silver

SOLUTIONS

S1. Ans.(a)
Sol. The slew rate of an electronic circuit is defined as the rate of change of the voltage per unit of time. The units for slew rate are Volts per second or V/μS.

S2. Ans.(b)
Sol. The negative temperature coefficient of the resistance is only present in the insulators or the semiconductors. In these, the resistance decreases with increase in temperature.

S3. Ans.(c)
Sol. The commercial unit of electric energy is KWh.

S4. Ans.(b)
Sol. A phasor diagram showing the ideal transformer on load:
The currents I1 and I2 are in antiphase because the corresponding m.m.f are in opposition in the magnetic circuit.

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S5. Ans.(a)
Sol. For small currents, alloy of lead and tin (lead 37%, tin 63%) is used for making the fuse element. For larger currents, copper or silver is employed.
Properties of Fuse element:
low melting point
high conductivity
free from deterioration due to oxidation
low cost

S6. Ans.(c)
Sol. Nichrome (80% Ni/20% Cr) wire: Nichrome is a non-magnetic alloy of nickel and chromium. Nichrome is widely used in heating elements. It is wound in wire coils to a certain electrical resistance, and current passed through to produce heat.

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