DFCCIL Executive Exam Analysis Electrical Engineering

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DFCCIL Executive Exam Analysis Electrical Engineering. DFCCIL is conducting an online CBT Examination to recruit Junior Executives, Executives, and Junior Managers from 27th September 2021 to 30th September 2021 for a total of 1074 DFCCIL Vacancies. DFCCIL Exam Analysis of Executive Examination is discussed in detail in this article for Electrical Engineering. The DFCCIL Executive Electrical Engineering Exam was conducted on 30th September in the third shift, and the exam timings were 4:30 PM to 6:30 PM. Read the article till the end to get the detailed DFCCIL Exam Analysis for Executive Electrical Engineering (Shift III).

DFCCIL Exam Pattern for Executive Executive Engineering

Part	Test	Subject	Question	Marks	Time
1	General Knowledge	General Knowledge	12	24	120 min
1	General Knowledge	General Aptitude/Reasoning	12	24
2	Engineering Discipline	Engineering	96	96
Total			120	120

DFCCIL Executive Exam Analysis: Electrical Engineering

The DFCCIL Junior Executive Exam was moderate as experienced by the candidates. The Technical Part consists of both theoretical as well as numerical questions. The percentage of numerical questions was more but the level was easy. Candidates also found lengthy questions from Electronics. Questions from Machines were having complex calculations. The number of good attempts as analyzed by our specialists is given below.

Section Name	Maximum No. of Questions
Section Name	Maximum No. of Questions	Good Attempts
General Knowledge	24	14-20
General Aptitude	24	14-20
Civil Engineering	96	65-80
Total	120	75-115

DFCCIL Executive Electrical Engineering Topic-wise Exam Analysis

The Memory based question of DFCCIL Executive Electrical Engineering Exam Analysis is given below check. Check the detailed DFCCIL Exam Analysis for Electrical Engineering as given Below.

Topic	Number of Questions
DC Machines	22-24
Circuit Analysis	17-19
Power Systems	5-7
Material Science	4
Electronics	17-18
Control System	4-5
Measurement	13-14
EMT	3-4

DFCCIL Result 2021

The DFCCIL Result is soon to be released by DFCCIL Recruitment Board, As soon as there is an official update we will update you on our website ADDA247 Engineering Jobs.

Related Exams

UKPSC AE Recruitment 2021	UPPSC AE Recruitment 2021
GSECL JE Recruitment 2021	SJVN JE recruitment 2021

Daily Concept Booster Electrical Engineering: HVDC Transmission Systems Part-01

HVDC Transmission Systems

HVAC v/s HVDC

In AC Transmission, the direction of voltage and current change continuously which causes overheating in the lines, thus resulting in significant power loss. Unlike AC transmission, current and voltage flow in one direction only in DC Transmission. So, when we convert HVAC into HVDC we observe a significant reduction in power loss hence increasing the efficiency of the transmission lines.

Comparison of AC and DC Transmission

The merits of two modes of transmission (AC & DC) should be compared based on the
following factors.
1. Economics of transmission
2. Technical Performance
3. Reliability

Classification of HVDC Links

The high voltage dc links may be classified into:

1. Monopolar Link: monopolar link has only one conductor and return path is provided by permanent earth or sea.

2. Bipolar Link: This is the most widely used dc link for overhead long-distance HVDC transmission systems and also for back-to-back HVDC system. This link has two conductors— one operating with positive polarity and the other with negative polarity with respect to the earthed tower structure.

3. Homopolar Link: A homopolar link has two or more conductors having the same polarity.

NHPC Civil JE syllabus 2021, Check Detailed Syllabus for Civil Engineering

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NHPC Civil JE syllabus 2021, Check Detailed Syllabus for Civil Engineering. National Hydroelectric Power Corporation Has recently rolled out NHPC JE Recruitment Notification 2021to recruit Junior Engineers From Mechanical Civil and Electrical Engineering Branches. There are a total of 133 NHPC JE Vacancies that are to be recruited through this recruitment drive. For Civil Engineering, The total number of Vacancies is 68. Here in this post, we’ve discussed the NHPC Civil Syllabus 2021 along with the preparation tips for Civil Engineering Students to crack NHPC JE Recruitment 2021. The last date to apply for NHPC JE Recruitment 2021 was 30th September, all the interested and eligible candidates have already applied, now it’s time to plan the preparation to get sure shot selection. Check NHPC Civil JE Syllabus 2021.

NHPC JE All India Live Mock Test Only on Adda247 App!

NHPC JE Exam Pattern 2021

Topic	No. of Questions
Concerned Discipline (Part I)	140
General Awareness(Part II)	30
Reasoning (Part III)	30
TOTAL	200

Important points for NHPC Exam Pattern 2021

The total time of Examination is 3 Hours i.e. 180 Minutes.
The Total Number of Questions is 200.
Each Question Carries 1 Mark so the total marks of the Examination are 200.
All the questions will be Multiple Choice Questions.

NHPC JE Syllabus Civil Engineering

NHPC JE Technical Syllabus for Civil Engineering

 Structural Engineering
 Construction Materials & Management
 Concrete Structures
 Steel Structure
 Soil Mechanics & Foundation Engineering
 Water Supply and Sanitation
 Water & wastewater
 Rain Water Harvesting

 Water Proofing
 Sewage Treatment Plants and Treated Sewage Water
 Municipal Solid Waste Management
 Road / Railways

NHPC JE Syllabus for General Awareness

Indian Polity, Economy & Culture
Current National and International Important Events
Indian Agriculture, Commerce & Trade
Population, Ecology & urbanization
General Science
Culture and traditions of Uttar Pradesh
History of India
World Geography & Indian Geography & Natural Resources of India
Indian National Movement
Logical Reasoning
Basic elementary mathematics

NHPC JE Syllabus for Reasoning

Discrimination
Figures Classification
Non-verbal series
Spatial Orientation
Visual Memory
Relationship concepts
Arithmetic Number Series
Arithmetical Reasoning
Similarities and Differences
Coding and Decoding
Spatial Visualization
Analogies
Alphabet Series
Observation etc.

NHPC JE Preparation Tips

Candidates need to have great conceptual strength on fundamental subjects are they’re of great weightage.
Preparation of General Awareness should include Current Affairs and well as general studies as questions can be expected from both.
Good practice of reasoning is required by the candidates, SSC/RRB JE questions can be solved for reference.
Good Test Series are also required to be solved by candidates in order to have good speed and accuracy in exams. Checkout the NHPC JE Test Series

NHPC JE Related Links

NHPC JE Notification 2021	NHPC JE Syllabus 2021
NHPC JE Vacancy Details 2021	NHPC JE Salary Perks and Allowances
NHPC JE Eligibility Criteria 2021	NHPC JE Exam Pattern 2021
NHPC JE Selection Process 2021	NHPC JE Admit Card Download 2021

NHPC JE All India Live Mock Test Only on Adda247 App!

Daily Concept Booster Civil Engineering : Deflection Due to Axial load

Deflection due to axial load

Stress (σ)=Pinternal/A
▭(σ=P/A)
Strain (ϵ)=(change in length)/(original length)
▭(ϵ=∆L/L)

Youngs modulus of elasticity (E) =Stress/Strain
E = σ/ϵ
E=(P\/A)/(∆L\/L)
▭(∆L=PL/AE)
→ This formula is valid only when P,A,E are constant.

Boost your preparation with the all-new Concept Booster Series by Adda247 Engineering Jobs, this series aims to target all the important engineering exams such as SSC JE 2022, GATE 2022, ESE 2022, and many more. Please reach out to us with your feedback in the comment section.

UPSSSC-JE’21 CE: Daily Practice Quiz. 30-September-2021

Know your strengths and practice your concepts with this quiz on UPSSSC-JE Recruitment 2021. This quiz for UPSSSC-JE Recruitment 2021 is designed specially according to UPSSSC-JE Syllabus 2021.

Quiz: Civil Engineering
Exam: UPSSSC-JE
Topic: MISCELLANEOUS

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. Viscosity of a fluid with specific gravity 1.3 is measured to be 0.0034 Ns/m². Its kinematic viscosity, in m²/s, is___________:
(a) 2.6 × 10-6
(b) 4.4 × 10-6
(c) 5.8 × 10-6
(d) 7.2 × 10-6

Q2. Tesla is the SI unit of _________
(a) magnetic flux density
(b) magnetic flux
(c) luminous flux
(d) illumination

Q3. Two Tensile forces, each of magnitude F are acting at a point perpendicular to each other, then their resultant force will be :
(a) √F
(b) √2F
(c) √2 F
(d) Zero

Q4. What are the equilibrium conditions to be satisfied for a particle applied with a system of non-coplanar, concurrent forces?
(a) ΣF_x = 0 & ΣF_y = 0
(b) ΣF_x = 0, ΣF_y = 0] ΣF_z = 0, ΣM_x = 0m ΣM_y = 0 & ΣM_z = 0
(c) ΣF_x = 0, ΣF_y = 0 & ΣF_(z-axis) = 0
(d) ΣF_x = 0, ΣF_y = 0 & ΣF_z = 0

Q5. Angle of friction is the
(a) Angle between normal reaction and the resultant of normal reaction and the limiting frictional force
(b) Ratio of limiting friction and normal reaction
(c) Ratio of static and dynamic friction
(d) None of the above

Q6. A flat road has a curve segment with a radius of 150 m. While negotiating this curve, vehicle slipped on its tyres as well as tried to roll over at a particular speed. This speed assuming a friction coefficient of 0.4 is :
(a) 18 m/s
(b) 25 m/s
(c) 32 m/s
(d) 20 m/s

SOLUTION

S1. Ans. (a)
Sol. Dynamic viscosity (μ) = 0.0034 (N-S)/m²
Specific gravity (G) = 1.3
Kinematic viscosity (ν) = μ/ρ
ν = μ/(ρ_w G)
ν = 0.0034/(1000×1.3 )
= 2.61 × 10^(-6) m²/sec.

S2. Ans.(a)
Sol. Tesla is the unit of magnetic flux density in SI.

S3. Ans.(c)
Sol. R = √(F^2+F^2+2F.Fcos 90°)
R = √2 F

S4. Ans.(d)
Sol. the sum of all forces in three direction should be zero the moment should also be zero but in case of concurrent forces moment will be automatically zero.

S5. Ans.(a)
Sample Page - Part 352_10.1
Sol. The angle of friction is the angle between the resultant of friction force and normal reaction force with Normal reaction force.
In this case frictional force have its maximum value i.e limiting friction force.

S6. Ans.(b)
Sol. In case of road turn the centrifugal force should be equal to friction force

NHPC-JE’21 CE: Daily Practices Quiz. 01-Oct-2021

Know your strengths and practice your concepts with this quiz on NHPC JE Recruitment 2021. This quiz for NHPC JE Recruitment 2021 is designed specially according to NHPC Syllabus 2021.

Quiz: Civil Engineering
Exam: NHPC-JE
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. A stress element is subjected to tensile stress of 5 MPa on both the principal planes. The radius of Mohr Circle corresponding to this element will be
(a) 10 MPa
(b) 7.5 MPa
(c) 5 MPa
(d) Zero

Q2. Which of the following method is used to forecast the population of old and very large city?
(a) Arithmetical increase method
(b) Geometric progression method
(c) Graphical method
(d) Logistic curve method

Q3. Using Blasius equation, the friction factor for turbulent flow through pipes varies as:
(a) Re^(-1)
(b) Re^(-0.5)
(c) Re^(-0.33)
(d) Re^(-0.25)

Q4. If the Euler load for a column is 1000 kN and crushing load is 1200 kN, then the Rankine load will approximately be:
(a) 1200
(b) 600
(c) 900
(d) 545

Q5. Usually a canal is filling is provided with a side slope of (in case of loam soil)
(a) 1 : 1
(b) 1.25 : 1
(c) 1.5 : 1
(d) 2 : 1

Q6. The Los Angeles abrasion value (%) of aggregates to be used for the final layer of bituminous concrete is limited to:
(a) 25
(b) 30
(c) 40
(d) 50

Solutions

S1. Ans.(d)
Sol.
Sample Page - Part 352_11.1
σx = 5 MPa
σy = 5 MPa
Radius of Mohr circle = |(σx-σy)/2|
= |(5-5)/2|
= 0

S2. Ans.(a)
Sol. Arithmetical increase method is used to forecast the population of old and very large city. According to this method, the Population of town or city after ‘n’ decades is
▭(P_n=P_o+nx ̅ )
P_0= Present population
n = no. of decades
x ̅= Average of increase in population
P_n= Population after ‘n’ decades

S3. Ans.(d)
Sol. Friction factor according to Blasius equation,
f=0.316/(R_e^(1⁄4) )
f ∝1/(R_e^(1⁄4) )
f ∝ R_e^((-1)⁄4)
f ∝ R_e^(-0.25)

S4. Ans.(d)
Sol. Pe= 1000 KN
Pcr = 1200 KN
Rankine load = ?
1/P=1/Pe+1/Pc
1/P=1/1000+1/1200
P= 545.45 KN

S5. Ans.(c)
Sol. The side slope of canal is provided in different condition as follows for loam soil
1. In cutting = H:V = 1:1
2. In filling = H:V = 1.5:1
And for sandy soil
1. In cutting = H:V = 1.5:1
2. In filling = H:V = 2:1

S6. Ans.(b)
Sol. The los angle abrasion value (%) of aggregate to be used for the final layer of bituminous concrete is limited to 30%.

NHPC JE’21 ME: Daily Practices Quiz. 01-Oct-2021

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NHPC JE Recruitment 2021

National Hydroelectric Power Corporation (NHPC) has released the recruitment notification for engagement of following posts such as Senior Medical Officer, Assistant Rajbhasha Officer, Junior Engineer & Sr. Accountant posts. NHPC expects application from High Performing, Dynamic & Achievement-Oriented Professionals candidates to fill up these 173 vacancies.

NHPC-JE’21 ME: Daily Practices Quiz

NHPC-JE’21 ME: Daily Practices Quiz 01-Oct-2021

Quiz: Mechanical Engineering
Exam: NHPC JE
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes

Q1. The composition of German silver is
(a) 12.5% silver
(b) 5% silver
(c) 1% silver
(d) None of the above

Q2. The velocity along the shear plane is known as
(a) Shear velocity
(b) Chip velocity
(c) Cutting velocity
(d) Mean velocity

Q3. If the ratio of the pitch of rivets to the diameter of the rivet hole is 4, then the tearing efficiency of the joint is
(a) 300 %
(b) 75 %
(c) 50 %
(d) 400 %

Q4. The length of a flat plate is 2 m and width 50 cm is placed in a fluid stream at 50^o C blowing parallel to it. The convective heat transfer co-efficient of the fluid is 10 W/〖(m〗^2 K). The heat transfer takes place, if the plate is maintained at a temperature of 350^o C is
(a) 3 kW
(b) 4 kW
(c) 0.3 kW
(d) 30 kW

Q5. Resilience means
(a) Failure of material at loads less than at normal conditions
(b) Resilience of the material to elastic deformation
(c) Ability of the material to return to the original shape when load is removed.
(d) Capacity of a material to absorb energy elastically

Q6. For a machine to be overhauling, its efficiency should be
(a) 100 %
(b) Less than 67 %
(c) More than 50 %
(d) Less than 50 %

Solutions

S1. Ans. (d)
Sol. There is no contamination of silver in German silver we can call it German silver just because it is appearing as silver.
German silver contains 60% cu, 20% Ni, and 20% Zn.

S2. Ans. (a)
Sol. The velocity along the tool face = chip velocity
The velocity along the shear plane = shear velocity
The velocity in the direction of cutting = cutting velocity.

S3. Ans(b)
Sol. we know that the efficiency of the riveted joint is
η=(strength of riveted joint )/(strength of plate without rivet)×100
η=((p-d)tσ_t)/(ptσ_t )×100
η=((p-d))/p×100
η=(1-d/p)×100
η=75 %
S4. Ans(a)
Sol. by Newton’s law of cooling for convection heat transfer
Q=h A ∆T
Q=10×2×0.50×(350-50)
Q=3 kW

S5. Ans(d)
Sol.
Resilience – Capacity of a material to absorb energy elastically
Fatigue – Failure of material at loads less than at normal conditions
Stiffness – Resilience of the material to elastic deformation
Elasticity – Ability of the material to return to the original shape when load is removed.

S6. Ans(d)
Sol. If the efficiency is more than 50%, then the screw is said to be overhauling. Efficiency of self-locking screws is less than 50%.

UPPSC Lec’21 ME: Daily Practices Quiz. 01-Oct-2021

Quiz: Mechanical Engineering
Exam: UPPSC Lecturer
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes

Q1. A pitot static tube is used to measure
(a) Stagnation pressure
(b) Static pressure
(c) Dynamic pressure
(d) Difference between the static pressure and dynamic pressure

Q2. The constant pressure lines ……. on a Mollier diagram
(a) Are equispaced throughout
(b) First Converge and then diverge
(c) Diverge from left to right
(d) Diverge from right to left

Q3. Splines are used when
(a) Power to be transmitted is low
(b) High rotational speeds are involved
(c) High torque is to be transmitted
(d) There is need for axial relative motion between the shaft and hub

Q4. The state of stress at a point in a loaded member is σ_x=400 MPa, σ_y=-400 MPa and σ_xy=300 MPa. The principal stresses 1 and 2 are
(a) 300 MPa and –700 MPa
(b) 400 MPa and –600 MPa
(c) 500 MPa and – 500 MPa
(d) 600 MPa and – 400 MPa

Q5. Diagram factor is defined as the ratio of
(a) Actual indicated work to hypothetical indicated work
(b) Hypothetical indicated work to actual indicated work
(c) Actual work to isentropic work
(d) Hypothetical work to Actual Work

Q6. The type of valve which is used in reciprocating refrigerant compressors?
(a) Mushroom valve
(b) Puppet valve
(c) Plate valve
(d) Throttle valve

Solutions

S1. Ans. (c)
Sol. A simple pitot tube measure stagnation pressure but a pitot static tube is used to measure dynamic pressure.

S2. Ans. (c)
Sol. Constant pressure lines diverge from left to right on Mollier diagram.
Mollier diagram is drawn between enthalpy (h) on y-axis and entropy (s) on x-axis.
The slope of the constant pressure line on h-s curve is absolute temperature.

S3. Ans. (d)
Sol. Splines are used to provide torque and speed from the shaft to the hub or vice-versa.

S4. Ans.(c)
Sol.
Principal stress,
σ_1,σ¬_2=(400 – 400)/2 ± √(((400 + 400)/2)^2+300²)
= ±√(400^2+300²) = ± 500 MPa

S5. Ans. (a)
Sol. Diagram factor=(Area of actual indicator diagram)/(Area of hypothetical indicator diagram)

S6. Ans. (c)
Sol. Plate valve is used in the reciprocating refrigerant compressor.

Daily Concept Booster Mechanical Engineering: Torsion Part-01

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Torsion

Torsion means, twisting of a shaft when a couple or torque is applied on it about longitudinal axis

Equation of Torsion

T/J=τ/r=Gθ/L
Where
T=Torque applied
J=Polar Moment of Inertia
τ=Shear stress
G=Shear Modulus
θ=Angle of twist in radian
L=length of shaft
Note: Angle of twist is maximum at the free end of the shaft
Shear stress is zero at the centre and maximum at the extreme fibre of the shaft