ASSAM JLEE 2020: Engineering Graphics (Section -III) Solved Answer

 JLEE 2020

ENGINEERING GRAPHICS (SECTION -III)

Solved Answer

1.    Which one of the following conics has an eccentricity of unity?

        

        a)     Circle

        b)    Parabola 

        c)     Hyperbola

        d)    Ellipse 

        Answer: (b) Parabola

Explanation: Eccentricity is defined as the ratio of the distance from the focus to the distance from the directrix. It is denoted as e. The value of eccentricity can give information regarding which type of conics it is. The eccentricity of an ellipse is less than one. 

2.    If a point lies above H.P. and behind V.P. then the top view lies ______________ with respect to xy line

        a)     Above

        b)    Below

        c)     In the plane

        d)    None

        Answer: (a) Above

3.    The length of the drawing is 50 mm, the scale is given as 1: 5. Find the actual length.

        a) 50 cm

        b) 10 cm

        c) 25 cm 

        d) 10 mm

        Answer: (c) 25 mm

Explanation: The scale given is 1:5 (reducing scale) that is the drawing is made with 1/5th of actual dimensions. So we have to multiply the drawing length with 5. 50 mm x 5 =250 mm and 1 cm =10 mm. The actual length in cm is 25.

4.    Which of the following is a conic section?

        a)     Triangle

        b)    Rectangle

        c)     Circle

        d)    Square

        Answer: (c) Circle

Explanation: A conic section means exactly what the name says: it is a certain section of a cone (or cones). They are composed of the area of intersection between a plane and a cone.

5.    An ellipse is “ the of all points in a plane such that the sum of the distances from two fixed points (foci) is constant “ and equal to:

        a) Major axis distance

        b) Minor axis distance

        c) Half of the major axis distance

        d) None of the above

        Answer:  (a) Major axis distance

6.    The line given below is used for:

 

        a) Long Break lines

        

        b) Cutting planes

        

        c) Centroidal lines

        d) Outlines of adjacent parts

        Answer: a) Long Break lines

7.    The slope of straight line is referred as

        a) Inclination of line

        b) Order pair of line

        c) Ordinates  of line

        d) Intercepts of line

        Answer: a) Inclination of line

 8.   If a point lies in the fourth quadrant, then

        a) Front and top views lies above xy line

        b) Front and top views lies below xy line

        c) Front view lies above xy line and top view lies on the xy line

        d) Both views lies on the xy line

        Answer: b) Front and top views lies below xy line

 9.    Graphically the pair of equations 7x –y = 5, 21x -3y =10 represents two lines which are:

        a)     Intersecting at one point

        b)    Parallel

        c)     Intersecting at two points

        d)    Coincident

        Answer: b) Parallel

Explanation: These lines are parallel because they have the same slope which is 7

 10.    Which of the following is not an enlarging scale?

        a) 2:1

        b) 4:3

        c) 3:5

        d) 6:1

        Answer: c) 3:5 

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