Showing posts from August, 2013

(Questions with Answer Key)- GATE 2013 Civil Engineering Examination

GATE 2013 Questions and answer key for CIVIL ENGG. Q. 1 – Q. 25 carries one mark each.
Q.1 There is no value of x that can simultaneously satisfy both the given equations.Therefore, find the
‘least squares error’ solution to the two equations, i.e., find the value of x that minimizes the sum of
squares of the errors in the two equations. __________
2x = 3
                                        4x =1

Q.2 What is the minimum number of multiplications involved in computing the matrix product PQR?
Matrix P has 4 rows and 2 columns, matrix Q has 2 rows and 4 columns, and matrix R has 4 rows and
1 column. ________Sol:__16 multiplications

Q.3 A 1-h rainfall of 10 cm magnitude at a station has a return period of 50 years. The probability that
a 1-h rainfall of magnitude 10 cm or more will occur in each of two successive years is:
(A) 0.04  (B) 0.2  (C)0.02  (D) 0.0004                                 Sol: (D)   p = 1/50*1/50

Q.4 Maximum possible value of Compacting Factor for fresh (green) concrete …

GATE 2012 Questions and Answer key

Q.(1-25) Carry one marks each Q.1 The estimate obtained of the definite integral by the Simpson's rule with three-point function evaluation exceeds the exact value by
(a) 0.235   (b) 0.068    (c) 0.024    (d) 0.012                      Sol : (d)   Q.2 The annual precipitation data of a city is normally distributed with mean and standard deviation as 1000 mm and 200 mm, respectively. The probability that the annual precipitation will be more than 1200 mm is (a) <50%   (b) 50%    (c) 75%    (d) 100%                                        Sol: (a)
Q.3 The infinite series 1+x+x^2/2! + x^3/3! + x^4/4! +.........   (a) sec x    (b) e^x     (c) cos x    (d) 1 + sin^2 x                              Sol: (b)
Q.4 The Poisson's ratio is defined as   (a) mode[axial stress/ Lateral Stress]        (b) mode[lateral strain/ axial strain]    (c) mode[lateral stress/axial stress]          (d) mode[axial strain/lateral strain]       Sol: (b)
Q.5 The following statements are related to bending of be…

Tacheometry (Surveying)


Tacheometry is the branch of Surveying in which we determine the horizontal and vertical distances with the angular measurements with an instrument , Tachemometer. It is not so accurate method of finding the horizontal distances as the Chaining is, but it is most suitable for carrying out the surveys to find the distances in the hilly area where other methods are quite difficult being carried out. It is generally used to locate contours, hydrographic surveys and laying out routes of highways, railways etc.

The instruments required for carrying out the Tacheometric survey are: (1) A Tacheometer (2) A Stadia Rod.
Tacheometer: Tacheometer is more or less a Theodolite installed with  a stadia diaphragm. Stadia diaphragm is equiped with three horizontal hairs and one vertical hair. So we can take three vertical staff reading at the same instruments setting, lower most hair reading, central hair reading and the top hair reading. The difference between the lower hair reading and the upper ha…

Contours - Characteristics and Uses

You can walk along the spaced contours much more easily, as compared to the crowded contours. Do yo know what is a contour? Here are certain terms which are useful in understanding the contours. Contour -  Contour is an imaginary line on ground joining points of equal or constant elevations. contours are important to draw the topographical maps in which vertical distances are also shown using the contour lines.Contour interval: Vertical distance between any two consecutive contours is known as the contour interval. It depends upon the scale of the map, nature of the ground and availability of the fund  and time.Horizontal equivalent/ horizontal interval:  It is the shortest horizontal distance between the two consecutive contours. Contour Gradient: Imaginary line on the surface of the earth, maintains a constant angle to the horizontal. 

Characteristics of the contours:
Two contours of different elevation do not cross each other with only exception in the contours of a overhanging…

Theodolite and Useful Terms


Theodolite: Theodolite is the most precise instrument designed for the measurement of the horizontal and vertical angles.

Commonly used terms in a Theodolite Survey:

(a) Centering: It means setting the Theodolite exactly over an instrument station so that its vertical axis passes through the station mark. It is done with the help of a Plumb bob suspended from the vertical axis of the Theodolite.(b) Transiting: It is the process of reversing the telescope/line of sight about the horizontal axis in the vertical plane.(c)Face Left and Face Right : If the vertical circle of the Theodolite is on the left side of the observer, then the observation taken are known as Face Left observations. Similarly if the vertical circle is on the right, the observation taken such as are known as Face Right observations.(d) Line of collimation : Line of collimation or also known as the line of sight is the imaginary line joining the center of the cross hairs and the center of the object glass and its con…

Plane Table Survey - Surveying(Civil Engineering)


A short introduction to plane tabling- A graphical method of Surveying.

Plane Table Survey:
Plane Table Survey is a method of Surveying in which field work and the office work are done simultaneously. It is also known as the graphical method of Surveying. A manuscript map is made in the field and the topographic details can be filled in later.

List of Instruments used in Surveying:

(1) Plane Table(2) Alidade(3) Plumbing fork and Plumb bob(4) Spirit Level(5) Chain or Tape(6) Rain roof cover for the plane table(7) Compass(8) Ranging Rods(9) Drawing Sheets(10) Drawing equipment.

Procedure: To do the plane tabling one has to follow the following procedure at every plane table set-up:
(a) Fixing the plane table to the tripod stand(b)Setting up and temporary adjustments:

    Leveling the plane table with the help of spirit level   Centering with the help of plumbing fork    Orientation by trough compass or by back sighting

(c) Sighting the points with the help of Alidade

Methods of plane tabli…

GATE 2011 Civil Engineering -Questions with answers Key

CIVIL ENGINEERING - GATE 2011 (with answers)  Q.(1-25) carry one mark each1.[A] is a square matrix which is neither symmetric nor skew-symmetric and [A]T is its transpose. The sum and difference of these matrices are defined as [S] = [A] + [A]T  and [D] = [A] - [A]T, respectively. Which of the following statements is true? (a) Both [S] and [D] are symmetric. (b) Both [S] and [D] are skew-symmetric (c) [S] is skew symmetric and [D] is symmetric. (d) [S] is symmetric and [D] is skew symmetric.                                                      Sol: (d)

2.The square root of a number N is to be obtained by applying the Newton Raphson iterations to the equation x^2 - N = 0. If i denotes the iteration index, the correct iterative scheme will be
(a) x i+1  = 1/2 { xi + N/xi }
(b) x i+1  = 1/2 { xi2 + N/xi }
(c) x i+1  = 1/2 { xi + N2/xi }

(d) x i+1  = 1/2 { xi2 - N/xi }                                                                                Sol: (a)

3. There are two containers, with o…