NHPC-JE’21 EE: Daily Practices Quiz 28-Oct-2021

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NHPC-JE’21 EE: Daily Practices Quiz

NHPC-JE’21 EE: Daily Practices Quiz 28-Oct-2021

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

Q1. The no-load current drawn by a transformer is usually ……………of the full-load
current.
(a) 10 to 15 percent
(b) 15 to 20 percent
(c) 2 to 5 percent
(d) 0.2 to 0.5 percent

Q2. …… is a conductor from which tapings are taken for supply to the consumers.
(a) Delivery unit
(b) Service main
(c) Feeder
(d) Distributor

Q3. Which of the following emit greenish-blue colour?
(a) Sodium vapour lamp
(b) Neon tube
(c) Mercury vapour lamp
(d) Neon lamp

Q4. Merz price protection is used for the protection of:
(a) Both Transformer and Alternator
(b) Transformer
(c) Transmission lines
(d) Alternator

Q5. The SI unit of magnetic flux is……
(a) Weber
(b) Maxwell
(c) Tesla
(d) Gauss

Q6. A pole pitch in an electrical machine is
(a) Equal to 180° Electrical
(b) Equal to 180° Mechanical
(c) Less than 180° electrical
(d) Greater than 180° electrical

SOLUTIONS

S1. Ans.(c)
Sol. The no-load current drawn by a transformer is usually (2-5) % of the full-load
current.

S2. Ans.(d)
Sol.
Distributor: A distributor is a conductor from which tapping are taken for supply to the consumers. The current through a distributor is not constant because tapping are taken at various places along its length.

S3. Ans.(c)
Sol. A mercury vapour lamp producing greenish-blue colour of light.

S4. Ans.(a)
Sol. Merz price protection is used for the protection of both alternators and transformers.
• Merz price differential protection is used to protect the transformer from internal short circuit, Internal ground faults and inter turn shorts.
• For alternator, the most severe outcome of fault is the damage of stator. For this, the differential protection of alternator or Merz price circulating current protection system is used which protects alternators stator from burning through at least 80% if it.

S5. Ans.(a)
Sol. Φ = BA = Weber*m2/m2 = Weber

S6. Ans.(a)
Sol. 1 pole pitch=180⁰ electrical

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