UPPCL-JE’21 EE: Daily Practices Quiz 29-Oct-2021

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UPPCL-JE’21 EE: Daily Practices Quiz

UPPCL-JE’21 EE: Daily Practices Quiz 29-Oct-2021

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

Q1. Which of the following insulating materials is NOT used for cables?
(a) Polyvinyl Chloride
(b) Paper
(c) Polyurethane
(d) Vulcanized India Rubber

Q2. With regard to the Energy Conservation Act, 2001, the full form of B.E.E. is:
(a) Bold and Efficient Energy
(b) Branch of Energy Efficiency
(c) Board of Energy Efficiency
(d) Bureau of Energy Efficiency

Q3. In a D.C. motor, ……………. is also known as electrical characteristics.
(a) Torque-Flux characteristics.
(b) Speed-Armature current characteristics.
(c) Speed-Torque characteristics
(d) Torque-Armature current characteristics

Q4. Which of the following methods of starting is required for slip ring induction motors of high rating?
(a) Star delta starters
(b) Rotor resistance starters
(c) Direct on-line starters
(d) Auto-transformer starters

Q5. Oscillators use following feedback.
(a) Negative
(b) Positive
(c) Both negative and positive
(d) None of the above

Q6. Moving iron and PMMC instruments can be distinguished from each other by looking at
(a) Pointer
(b) Terminal size
(c) Scale
(d) Scale range

SOLUTIONS

S1. Ans.(c)
Sol. The principal insulating materials used in cables are rubber, vulcanised India rubber, impregnated paper, varnished cambric and polyvinyl chloride.

S2. Ans.(d)
Sol. Energy conservation Act, 2001 accommodates productive utilization of energy and its preservation for matters associated therewith or incidental thereto. It was instituted by the Parliament in the Fifty-second Year of the Republic of India and was enacted on 29th September 2001 but came into practice from 1st march, 2002. This act resulted in the formation of the Bureau of energy efficiency (BEE) which came into effect from 2002.

S3. Ans.(d)
Sol. Torque Vs. Armature Current (Ta-Ia)
This characteristic is also known as electrical characteristic. We know that torque is directly proportional to the product of armature current and field flux, Ta ∝ ɸ.Ia. In DC series motors, field winding is connected in series with the armature, i.e., Ia = If. Therefore, before magnetic saturation of the field, flux ɸ is directly proportional to Ia. Hence, before magnetic saturation Ta α Ia2. Therefore, the Ta-Ia curve is parabola for smaller values of Ia.

S4. Ans.(b)
Sol. Rotor resistance starters.

S5. Ans.(b)
Sol. Oscillators use positive feedback.

S6. Ans.(c)
Sol. A PMMC instruments has linear scale whereas moving iron instrument has non-linear /non-uniform scale.

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