# Electrical Power-II EP-2 6th Sem May 2015 Diploma Paper

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### Electrical Power-II EP-2 6th Semester May 2015 Diploma Paper. Download Previous year Electrical Power-II EP-2 6th Sem EE/EEE/5239/Diploma Solved Question Paper.

Electrical Power-II EP-2 6th Sem EEE May 2015 Diploma PSBTE Paper

`ELECTRICAL POWER 2 EP-II 6TH SEMESTER DIPLOMA PSBTE MAY 2015 PAPERÂ  Â    `

## Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â SECTION A

#### Â  Â  Â  Â  1. Fill in the blanks :

Â  Â  Â  i. ELCB stands for Earth Leakage Circuit Breaker.
Â  Â  Â  ii. A buchholz relay is used for the protection of Transformers.
Â  Â  Â iii. Ground wire is used to protect transmission lines against lightning strokes or lightning strokes AccidentsÂ
Â  Â  Â iv. The filler material in HRC fuse is Plaster of Paris.
Â  Â  Â  v. The value of fusing factor is Greater always than one.
Â  Â  Â vi. When all the three phases are short circuited, the fault is called Symmetrical Fault or Balanced Fault.
Â  Â  vii. In time graded over current protection Time discrimination is incorporated. proportional it the load power.
Â  Â viii. The maximum KVA demand of a consumer isÂ  Independent of the Power factor.
Â  Â  ix. The basic principle applied in Murray loop test is Wheatstone bridge for fault location.Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â Â x. An induction type relay can be employed on ac (alternating current) system only.

###### Q2. Attempt any five questions.Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 5×6=30

Â  Â  i. Discuss two part tariff and calculate the annual energy cost for an industrial consumer taking a load of 300Kw for half hrs and 100 KW for seven hrs per day.Â  Â  Â  Â  Â  Â  Â  Â  The consumer is charged at a rate of Rs.1000 per KW per annum plus Rs.1.50 per KWh.
Â  Â ii. Write a short note on static relays. Give their applications.
Â  Â iii. Differentiate between symmetrical and unsymmetrical faults.
Â  Â iv. Explain the working principle of circuit breakers with a schematic diagram.
Â  Â  v. Explain protection of transmission lines & substations against over voltages due to lightning.
Â  Â  vii. Discuss various faults that may occur in overhead transmission lines.

## Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  SECTION-C

#### Â  Â  Â Q3. Attempt any three questions.Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 3×10=30

Â  Â  i. What is a lightning arrestor? Give the requirements of a good lightning arrestor, Name various types and explain one of them in detail.
Â  Â  ii. Enlist various protection schemes employed to protect a power transformer. Explain the working of a buchholz relay with the help of a neat sketch.
Â  Â iii. What is the purpose of a fuse? Discuss the construction, working and advantages of an H.R.C cartridge type fuse with the help of a neat sketch.
Â  Â iv. Explain with a neat sketch the construction & working of SF6 circuit breaker.

## Electrical Power-II EP-2 6th Sem EEE May 2015 Diploma PSBTE Paper

### Section a FILL IN THE BLANKS Electrical Power-II MAY 2015 paper

ELCB stands for Earth Leakage Circuit Breaker.
Â  Â  Â

Â A buchholz relay is used for the protection of Transformers.
Â  Â

Ground wire is used to protect transmission lines against lightning strokes or lightning strokes AccidentsÂ
Â  Â Â

The filler material in HRC fuse is Plaster of Paris.
Â  Â  Â Â

The value of fusing factor is Greater always than one.
Â  Â  Â

When all the three phases are short circuited, the fault is called Symmetrical Fault or Balanced Fault.
Â  Â

In time graded over current protection Time discrimination is incorporated. proportional it the load power.
Â Â

The maximum KVA demand of a consumer isÂ  Independent of the Power factor.
Â  Â Â

Â The basic principle applied in Murray loop test is Wheatstone bridge for fault location.Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â Â

An induction type relay can be employed on ac (alternating current) system only.

Low

Three

### Section B :Electrical Power-II EP-2 6th Sem EEE MAY 2015 Diploma Paper

Two part tariff and calculate the annual energy cost for an industrial consumer taking a load of 300Kw for half hrs and 100 KW for seven hrs per day.The consumer is charged at a rate of Rs.1000 per KW per annum plus Rs.1.50 per KWh.Â  Â

short note on static relays. Give their applications.
Â

Â Differentiate between symmetrical and unsymmetrical faults.
Â

working principle of circuit breakersÂ
Â Â

Protection of transmission lines & substations against over voltages due to lightningÂ  Â

Various faults that may occur in overhead transmission lines.

## Electrical Power-II EP-2 6th Sem EEE May 2015 Diploma Paper

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### Section c Electrical Power-II EP-2 6th Sem EEE May 2015 Diploma Paper

Lightning arrestor Give the requirements of a good lightning arrestor,Â

Protection schemes employed to protect a power transformer.

Explain the working of a buchholz relay with the help of a neat sketch.

What is the purpose of a fuse? Discuss construction, working advantages of an H.R.C cartridge type fuse with the help of a neat sketch.

construction & working of SF6 circuit breaker

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