Results for Industrial Extension Officer

Basic Electrical Engineering MCQ-14

August 15, 2019

Basic Electrical Engineering MCQ-14




41. Which of the following statement about D.C. generators is false ?
(a) Compensating winding in a D.C. machine helps in commutation
(b) In a D. C. generator interpoles winding is connected in series with the armature
winding
(c) Back pitch and front pitch are both odd and approximately equal to the pole pitch
(d) Equilizing bus bars are used with parallel running of D.C. shunt generators
Ans: d
42. The demagnetising component of armature reaction in a D.C. generator
(a) reduces generator e.m.f.
(b) increases armature speed
(c) reduces interpoles flux density
(d) results in sparking trouble
Ans: a
43. Magnetic field in a D.C. generator is produced by
(a) electromagnets
(b) permanent magnets
(c) both (a) and (b)
(d) none of the above
Ans: a
44. The number of brushes in a commutator depends on
(a) speed of armature
(b) type of winding
(c) voltage
(d) amount of current to be collected
Ans: d
45. Compensating windings are used in D.C. generators
(a) mainly to reduce the eddy currents by providing local short-circuits
(b) to provide path for the circulation of cooling air
(c) to neutralise the cross-magnetising effect of the armature reaction
(d) none of the above
Ans: c
46. Which of the following components of a D.C, generator plays vital role for providing
direct current of a D.C. generator ?
(a) Dummy coils
(b) Commutator
(c) Eye bolt
(d) Equilizer rings
Ans: b
47. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by
(a) using conductor of annealed copper
(b) using commutator with large number of segments
(c) using carbon brushes of superior quality
(d) using equiliser rings
Ans: c

48. In D.C. generators, lap winding is used for
(a) high voltage, high current
(b) low voltage, high current
(c) high voltage, low current
(d) low voltage, low current
Ans: b
49. Two generators A and B have 6-poles each. Generator A has wave wound armature
while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A
and B will be
(a)    2 : 3
(b) 3 : 1
(c) 3 : 2
(d) 1 : 3
Ans: b
50. The voltage drop for which of the following types of brush can be expected to be least ?
(a) Graphite brushes
(b) Carbon brushes
(c) Metal graphite brushes
(d) None of the above
Ans: c
Basic Electrical Engineering MCQ-14 Basic Electrical Engineering MCQ-14 Reviewed by Sikha on August 15, 2019 Rating: 5

Basic Electrical Engineering MCQ- 13

August 15, 2019


Basic Electrical Engineering MCQ- 13


31. D.C. generators are connected to the busbars or disconnected from them only under the
floating condition
(a) to avoid sudden loading of the primemover
(b) to avoid mechanicaljerk to the shaft
(c) to avoid burning of switch contacts
(d) all above
Ans: d
32. Eddy currents are induced in the pole shoes of a D.C. machine due to
(a) oscillating magnetic field
(b) pulsating magnetic flux
(c) relative rotation between field and armature
(d) all above
Ans: c
33. In a D.C. machine, short-circuited field coil will result in
(a) odour of barning insulation
(b) unbalanced magnetic pull producing vibrations
(c) reduction of generated voltage for which excitation has to be increased to maintain the
voltage
(d) all above
Ans:
34. Equilizer rings are required in case armature is
(a) wave wound
(b) lap wound
(c) delta wound
(d) duplex wound
Ans: b
35. Welding generator will have
(a) lap winding
(b) wave winding
(c) delta winding
(d) duplex wave winding
Ans: a
36. In case of D.C. machine winding, number of commutator segments is equal to
(a) number of armature coils
(b) number of armature coil sides
(c) number of armature conductors
(d) number of armature turns
Ans: a
37. For a D.C. machines laboratory following type of D.C. supply will be suitable
(a) rotary converter
(b) mercury are rectifier
(c) induction motor D.C. generator set
(d) synchronous motor D.C. generator set
Ans: c
38. The function of pole shoes in the case of D.C. machine is
(a) to reduce the reluctance of the magnetic path
(b) to spread out the flux to achieve uniform flux density
(c) to support the field coil
(d) to discharge all the above functions
Ans: d
39. In the case of lap winding resultant pitch is
(a) multiplication of front and back pitches
(b) division of front pitch by back pitch
(c) sum of front and back pitches
(d) difference of front and back pitches
Ans: d
40. A D.C. welding generator has
(a) lap winding
(b) wave moving
(c) duplex winding
(d) any of the above
Ans: a
Basic Electrical Engineering MCQ- 13 Basic Electrical Engineering MCQ- 13 Reviewed by Sikha on August 15, 2019 Rating: 5

Basic Electrical Engineering MCQ- 12

August 15, 2019

Basic Electrical Engineering MCQ- 12
21. In D.C. generators, current to the external circuit from armature is given through
(a) commutator
(b) solid connection
(c) slip rings
(d) none of above
Ans: a
23. Brushes of D.C. machines are made of
(a) carbon
(b) soft copper
(c) hard copper
(d) all of above
Ans: a

24. If B is the flux density, I the length of conductor and v the velocity of conductor, then
induced e.m.f. is given by
(a)Blv
(b)Blv2
(c)Bl2v
(d)Bl2v2
Ans: a
25. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen
coils, the pole pitch will be
(a) 4
(b) 8
(c) 16
(d) 32
Ans: b

26. The material for commutator brushes is generally
(a) mica
(b) copper
(c) cast iron
(d) carbon
Ans: d
27. The insulating material used between the commutator segments is normally
(a) graphite
(b) paper
(c) mica
(d) insulating varnish
Ans: c
28. In D.C. generators, the brushes on commutator remain in contact with conductors
which
(a) lie under south pole
(b) lie under north pole
(c) lie under interpolar region
(d) are farthest from the poles
Ans: c
29. If brushes of a D.C. generator are moved in order to bring these brushes in magnetic
neutral axis, there will be
(a) demagnetisation only
(b) cross magnetisation as well as magnetisation
(c) crossmagnetisation as well as demagnetising
(d) cross magnetisation only
Ans: c

30. Armature reaction of an unsaturated D.C. machine is
(a) crossmagnetising
(b) demagnetising
(c) magnetising
(d) none of above
Ans: a

Basic Electrical Engineering MCQ- 12 Basic Electrical Engineering MCQ- 12 Reviewed by Sikha on August 15, 2019 Rating: 5

Industries Extension Officer Synchronous motor mcq part2

March 30, 2019

Industries Extension Officer Synchronous motor mcq part2



11. In a 3-phase synchronous motor
A. the speed of stator MMF is always more than that of rotor MMF
B. the speed of stator MMF is always less than that of rotor MMF.
The speed of stator MMF is synchronous speed while that of
rotor MMF is zero.
D. rotor and stator MMF are stationary with respect to each other


12. A salient pole synchronous motor is running at no load. Its field
current is switched off. The motor will
A. come to stop.
B. continue to run at synchronous speed
C. continue to run at a speed slightly more than the synchronous speed
D. continue to run at a speed slightly less than the synchronous speed


13. Asynchronous motor is called a synchronous capacitor, when it is:
A. under loaded
B. under excited
C. over excited
D. overload


14. The size of a synchronous motor is determined by the its..
A.KVA rating
B. kW rating
C. KVAR rating
D. none of the above


15. The synchronous speed for a 3 phase 6-pole induction motor is 1200
rpm. If the number of poles is now reduced to 4 with the frequency
remaining constant, the rotor speed with a slip of 5% will be.
A. 1690 rpm B.1750 rpm C. 1500 rpm D. 1710 rpm


16. The maximum power for a given excitation in a synchronous motor
is developed when the power angle is equal to
A.
B.45
C. 60
D.90



17. Asynchronous motor delivers reactive power when.....
A. over excited
B. under excited
C. normally excited
D. none of the above


18. In synchronous motor out of the following losses, which one will
have the highest proportion ?
A. stator copper losses
B. friction and windage losses
C. eddy current losses
D. iron losses


19. The capacity of a synchronous capacitor is generally in the range of
A. VAR B.MVAR C .KVAR D. none of the above


20.
The cost of leading power factor synchronous motor is. .. unity
power factor motors
B. more than
A. less than
C. about the same
D. none of the above
Industries Extension Officer Synchronous motor mcq part2 Industries Extension Officer Synchronous motor mcq part2 Reviewed by Sikha on March 30, 2019 Rating: 5

Industries Extension Officer Synchronous Motors MCQs

March 30, 2019

SYNCHRONOUS MOTORS


11.A three phase synchronous motor will have:
A.no slip rings
B. three slip rings
C. four slip rings
D. two slip rings

2.When a synchronous motor is running at synchronous speed, the
damper winding produces
A. damping torque
B. eddy current torque
C. torque aiding the developed torque. 
D. no torque

3. A motor which can conveniently be operated at lagging as well as leading power factors is the
A. squirrel cage induction motor. 
B. wound rotor induction motor
C. synchronous motor
D. DC shunt motor


5. The max'm speed of a synchronous motor in India is:
A. 1500 rpm. B. 1000 r.p.m C. 750 rpm. D.3000 rpm.
The rotor of a synchronous motor is excited with DC when the motor
A. is at standstill 
B. approaches synchronous speed
C. approaches half synchronous speed 
D. none of the above


6. KW rating of synchronous motor exciter is about ....% of the KVA rating of synchronous motor
A. 3
B.
SEC. 10
D. 15

7.
Synchronous speed of an induction motor is always:
A. equal to rotor speed
B. greater than rotor speed
C. twice the rotor speed
D. less than rotor speed

8.
Synchronous speed of an induction motor is 1000 rpm.
What will be the rotor speed, if slip is 3%
A. 30 rpm
B.300 rpm. C. 1700 rpm D.970 rpm


9Asynchronous motor, connected to an infinite bus is working at
leading p.f. It's excitation is
A. less than supply voltage Vs
B. equal to Vs
C.> Vs
D. none of these

10. Synchronizing power comes into play when the rotor speed is
A. equal to Synchronous speed Ns
C. SNs
D. either more
Industries Extension Officer Synchronous Motors MCQs Industries Extension Officer Synchronous Motors MCQs Reviewed by Sikha on March 30, 2019 Rating: 5

Industries Extension officer Rank file|Books for Industries Extension officer

March 30, 2019

Industries Extension officer Rank  file|Books for Industries Extension officer



In this post I will discuss about the important books for the preparation of Industries Extension officer Exam.

First of Let us go through the syllabus

Syllabus:

An Objective Type Test 

 Part I : Questions based on Educational qualification
Part II: GK, Current Affairs and Renaissance of Kerala

Main Topics:-

Part I - Basic Civil Engineering
Part II - Basic Mechanical Engineering
Part III - Basic Electrical Engineering
Part IV - Basic Electronics
Part V - Basic Computer Science

Industries Extension officer Rank  file


This book is published by Electron college; it is a good book for kick starting the preparation of Industries Extension officer .

you can check it Here. Buy it HERE

you can also check other books in My Notebook Store


Also check ;
Industries Extension officer Rank file|Books for Industries Extension officer Industries Extension officer Rank file|Books for Industries Extension officer Reviewed by Sikha on March 30, 2019 Rating: 5

Industrial Extension officer Ranklist 2010

March 30, 2019

Industrial Extension officer Ranklist 2010

You can watch the detailed Video HERE
Click Here to download official notification of IEO 2012
The Exam category Number: 403/2010
Number of candidates : 10642
Exam on : 02/03/2012, Friday    08.00 AM to  09.15 AM
(Maximum Marks : 100)
(Duration: 1.15 Hours)
( Medium of Questions: English )
Final Answer Key of Industries Extension officer
Shortlist Published on: 08/07/2013
You can download it HERE
Ranklist Published on: 22/04/2014
Ranked List No. 236/14/SSIV
You can download the Ranklist HERE

Syllabus:

An Objective Type Test (OMR - Valuation) based on the qualification prescribed for the post

Main Topics:-

Part I - Basic Civil Engineering
Part II - Basic Mechanical Engineering
Part III - Basic Electrical Engineering
Part IV - Basic Electronics
Part V - Basic Computer Science

 Visit EEE Made Easy for Study Materials

 Industries Extension officer Rank file BUY Here
Other Books for Industries Extension officer can be bought from HERE
You can Visit My Notebook Store also
WATCH INDUSTRIES EXTENSION OFFICER Coaching Classes HERE

Read also;

  1. Industries Extension officer 2018 Notification,Syllabus, Preparation Strategy etc
  2. Books for Industries Extension officer

Important Play lists:

Industrial Extension officer Coaching
Railway JE/ SSC JE Coaching 
Basic Electrical Engineering
Basic mechanical Engineering
Basic Electronics Engineering
Basic Civil Engineering 

 You can watch the detailed Video HERE
Click Here to download official notification of IEO 2012
The Exam category Number: 403/2010
Number of candidates : 10642
Exam on : 02/03/2012, Friday    08.00 AM to  09.15 AM
(Maximum Marks : 100)
(Duration: 1.15 Hours)
( Medium of Questions: English )
Final Answer Key of Industries Extension officer
Shortlist Published on: 08/07/2013
You can download it HERE
Ranklist Published on: 22/04/2014
Ranked List No. 236/14/SSIV
You can download the Ranklist HERE

Syllabus:

An Objective Type Test (OMR - Valuation) based on the qualification prescribed for the post

Main Topics:-

Part I - Basic Civil Engineering
Part II - Basic Mechanical Engineering
Part III - Basic Electrical Engineering
Part IV - Basic Electronics
Part V - Basic Computer Science
Visit EEE Made Easy for Study Materials
Industries Extension officer Rank file BUY Here
Other Books for Industries Extension officer can be bought from HERE
You can Visit My Notebook Store also
WATCH INDUSTRIES EXTENSION OFFICER Coaching Classes HERE

Read also;

  1. Industries Extension officer 2018 Notification,Syllabus, Preparation Strategy etc
  2. Books for Industries Extension officer

Important Play lists:

Industrial Extension officer Coaching
Railway JE/ SSC JE Coaching 
Basic Electrical Engineering
Basic mechanical Engineering
Basic Electronics Engineering
Basic Civil Engineering 
Industrial Extension officer Ranklist 2010 Industrial Extension officer Ranklist 2010 Reviewed by Sikha on March 30, 2019 Rating: 5

Building Materials- BRICKS Basic Civil Engineering Industrial Extension officer Coaching

March 09, 2019

Building Materials- BRICKS Basic Civil Engineering Industrial Extension officer Coaching



INDUSTRIAL EXTENSION OFFICER|EEEMADE EASY|BIBIMOHANAN


For Free Coaching Classes Visit EEE Made Easy Youtube Channel

Download PDF; link at the bottom of this page

Basic Civil Engineering-set 4

BRICKS

Contents




Brick


obtained by mouldinggood clay into a block, which is dried and then burnt.
oldest building block to replace stone
Manufacture of brick started with hand moulding, sun drying and
burning in clamps


Size


The size of the bricks are of 90 mm ×90 mm ×90 mm and 190 mm ×90 mm ×40 mm.
With mortar joints, the size of these bricks are taken as 200 mm ×100 mm ×100 mm and 200 mm ×100 mm×50 mm

Types of Bricks



Bricks may be broadly classified as:
(i) Building bricks
(ii) Paving bricks
(iii) Fire bricks
(iv) Special bricks

(i) Building Bricks: These bricks are used for the construction of walls.
(ii) Paving Bricks: These are vitrified bricks and are used as pavers.
(iii) Fire Bricks: These bricks are specially made to withstand furnace temperature. Silica bricks
belong to this category.

(iv) Special Bricks: These bricks are different from the commonly used building bricks with
respect to their shape and the purpose for which they are made. Some of such bricks are listed below:
(a) Specially shaped bricks
(b) Facing bricks
(c) Perforated building bricks
(d) Burnt clay hollow bricks
(e) Sewer bricks
( f ) Acid resistant bricks.

Properties of Bricks


(i) Colour: Colour should be uniform and bright.
(ii) Shape: Bricks should have plane faces. They should have sharp and true right-angled corners.
(iii) Size: Bricks should be of standard sizes as prescribed by codes.

(iv) Texture: They should possess fine, dense and uniform texture. They should not possess fissures, cavities, loose grit and unburnt lime.
(v) Soundness: When struck with a hammer or with another brick, it should produce metallic sound.
(vi) Hardness: Finger scratching should not produce any impression on the brick

. (vii) Strength: Crushing strength of brick should not be less than 3.5 N/mm2. A field test for strength is that when dropped from a height of 0.9 m to 1.0 mm on hard ground, the brick should not break into pieces.

(viii) Water Absorption: After immersing the brick in water for 24 hours, water absorption should not be more than 20 per cent by weight. For class-I works, this limit is 15 per cent.

(ix) Efflorescence: Bricks should not show white patches when soaked in water for 24 hours and then allowed to dry in shade. White patches are due to the presence of sulphate of calcium, magnesium and potassium. They keep the masonry permanently in damp and wet conditions

. (x) Thermal Conductivity: Bricks should have low thermal conductivity so that buildings built with them are cool in summer and warm in winter.

(xi) Sound Insulation: Heavier bricks are poor insulators of sound while lightweight and hollow bricks provide good sound insulation.

(xii) Fire Resistance: Fire-resistance of bricks is usually good. In fact, bricks are used to encase steel columns to protect them from fire.

Tests on Bricks


to find their suitability:
(i) Crushing strength
(ii) Absorption
(iii) Shape and size and
(iv) Efflorescence.


(i) Crushing Strength:

The brick specimen is immersed in water for 24 hours.
The frog of the brick is filled flush with 1:3 cement mortar and the specimen is stored in a damp jute bag for 24 hours
and then immersed in clean water for 24 hours.
The specimen is placed in a compression testing machine with 6 mm plywood on top and bottom of it to get a uniform load on the specimen.
Then the load is applied axially at a uniform rate of 14 N/mm2.
The crushing load is noted. Then the crushing strength is the ratio of crushing load to the area of brick loaded. Average of five specimens is taken as the crushing strength.

(ii) Absorption Test:

The brick specimen is weighed dry. Then they are immersed in water for a period of 24 hours. The specimen is taken out and wiped with a cloth. The weight of each specimen in a wet condition is determined. The difference in weight indicates the water absorbed. Then the percentage absorption is the ratio of water absorbed to dry weight multiplied by 100. The average of five specimens is taken. This value should not exceed 20 per cent.

(iii) Shape and Size:

Bricks should be of standard size and edges should be truly rectangular with sharp edges. To check it, 20 bricks are selected at random and they are stacked along the length, along the width and then along with the height.
For the standard bricks of size 190 mm ×90 mm ×90 mm.
IS code permits the following limits:
Lengthwise: 3680 to 3920 mm
Widthwise: 1740 to 1860 mm
Heightwise: 1740 to 1860 mm

field tests help in ascertaining the good quality bricks:
(i) uniformity in size
(ii) uniformity in colour
(iii) structure
(iv) hardness test
(v) sound test
(vi) strength test


Classification of Bricks Based on their Quality

(i) First-class bricks
(ii) Second class bricks
(iii) Third class bricks and
(iv) Fourth class bricks

(i) First Class Bricks:

These bricks are of standard shape and size. They are burnt in kilns. They fulfil all the desirable properties of bricks.

(ii) Second Class Bricks:

These bricks are ground moulded and burnt in kilns. The edges may not be sharp and uniform. The surface may be somewhat rough. Such bricks are commonly used for the construction of walls which are going to be plastered.

(iii) Third Class Bricks:

These bricks are ground moulded and burnt in clamps. Their edges are somewhat distorted. They produce dull sound when struck together. They are used for temporary and unimportant structures.

(iv) Fourth Class Bricks:

These are the over burnt bricks. They are dark in colour. The shape is irregular. They are used as aggregates for concrete in foundations, floors and roads

Uses of Bricks

Bricks are used in the following civil works:
(i) As building blocks.
(ii) For the lining of ovens, furnaces and chimneys.
(iii) For protecting steel columns from fire.
(iv) As aggregates in providing waterproofing to R.C.C. roofs.
(v) For pavers for footpaths and cycle tracks.
(vi) For lining sewer lines


Detailed Syllabus of Industrial Extension officer Watch HERE


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Building Materials- BRICKS Basic Civil Engineering Industrial Extension officer Coaching Building Materials- BRICKS Basic Civil Engineering Industrial Extension officer Coaching Reviewed by Sikha on March 09, 2019 Rating: 5

Basic Electrical MCQ set 1

February 26, 2019

Basic Electrical MCQ set 1



Transformers




1. A transformer works on the principle of

A. Faraday's law of electrolysis
B. Mutual induction between two inductively coupled circuits..
C. Self induction of coils
D. Conduction of current between primary and secondary

2. When a DC supply is given at primary of an unloaded transformer

A. Primary will carry heavy current and may possibly burn..
B. Secondary will carry heavy current
C. We will get high voltage on secondary side
D. We will get a A.C voltage on the secondary side according to run ratio

3. Buchholz relay is used in

A. line protection
B. Motor protection
C. Generator Protection
D. Transformer protection..

4. The temperay
Basic Electrical MCQ set 1 Basic Electrical MCQ set 1 Reviewed by Sikha on February 26, 2019 Rating: 5

Telecommunication Objective Questions with answers, UVH,VHF,LED,LCD

February 22, 2019


Telecommunication Objective Questions with answers, UVH,VHF,LED,LCD

TELECOMMUNICATION

Wireless radio communication was developed by
Ans : Guglielmo Marconi

First telecommunication device was
Ans : Telegraph

The frequencies transmitted by TV station is called
Ans : Channel

For radio transmission BBC uses
Ans : Short waves

Short waves ranging  from 14m to 60m are used for
Ans : International communication

The waves which travel long distances without loss in intensity
Ans : Short waves (14m to 60m)

Short waves ranging from 14m to 60m are used for
Ans : International communication

The waves which travel long distance without loss in intensity
Ans : Short waves (14m to 60m)


VERY HIGH FREQUENCY (VHF)

Electro magnetic spectrum between 30MHz and 300 MHz is called
Ans:VHF
VHF is used in
Ans:Radio Transmission and Radar

ULTRA HIGH FREQUENCY (UHF) 

Frequency ranging from 300 MHZ to 3GHz is called
Ans : UHF
UHF is used in 
Ans : Ratio Transmission and Radar



ULTRA HIGH FREQUENCY

Frequency ranging from 300MHZ to 3GHz is called
Ans : UHF
UHF is used in
Ans : T.V, Communication of satellite etc.
Telex
Ans : Teleprinter Exchange
The device used for communicating the text and images through telephone lines
Ans : Fax machine
The device used to convert audio frequency signals into sound
Ans : Loudspeaker
The instrument which has ability to convert sound into magnetic energy
Ans : Tape recorder

LCD AND LED

LCD - Liquid Crystal Display  
LED - Light Emitting Diode
LED is used as monitor, clocks, watches, calculators, telephones etc.
LED was invented by
Ans : Oleg Losev and Nick Holonyak
Working principle of LED 
Ans : Electroluminescence


Telecommunication Objective Questions with answers, UVH,VHF,LED,LCD Telecommunication Objective Questions with answers, UVH,VHF,LED,LCD Reviewed by Sikha on February 22, 2019 Rating: 5
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