END SEMESTER EXAMINATION, NOVEMBER-2018
Semester : 1st (New Course)
Subject Code : Me-101
ENGINEERING DRAWING
| Full Marks – 100 | Time – Four hours |
The figures in the margin indicate full marks
for the questions.
for the questions.
Answer all questions from PART–A and
any five from PART–B.
any five from PART–B.
PART – A
Marks – 25
(i) A continuous thick line in engineering drawing is primarily used to represent:
(ii) In the aligned system of dimensioning, the dimensions are placed:
(iii) In a third-angle orthographic projection, the top view is always drawn:
(iv) If a scale is integrated as 1:5, it is classified as a:
(v) The Representative Fraction (R.F.) is mathematically defined as:
(vi) A point ‘Q’ lies above the Horizontal Plane (H.P.) and in front of the Vertical Plane (V.P.). The point belongs to the:
(vii) The angle between any two isometric axes in an isometric projection is:
(viii) In a first-angle projection system, the left-hand side view of an object is projected on the:
(ix) When a straight line is parallel to both the H.P. and V.P., its true length is visible in:
(x) The locking device commonly used to prevent a nut from loosening due to vibration is a:
2. Fill in the blanks with appropriate words :
1×10=10
- (i) The ratio of the length of the drawing to the actual size of the object is called ___________.
- (ii) In engineering graphics, center lines are represented using thin ___________ lines.
- (iii) Larger geographical maps are constructed using a ___________ scale format.
- (iv) An auxiliary vertical plane (AVP) is perpendicular to the H.P. and inclined to the ___________.
- (v) When a plane surface is parallel to the H.P., its top view shows its ___________ shape.
- (vi) The standard angle configuration used in a metric thread design profile is ___________ degrees.
- (vii) Machine screws are generally classified and specified by the nominal ___________ of the thread.
- (viii) If the projection lines diverge from a single point source, the projection is called ___________.
- (ix) Sectional lines or hatching patterns are generally drawn at an angle of ___________ degrees.
- (x) The basic functional purpose of a key mechanism is to prevent relative ___________ between parts.
3. State true or false :
1×5=5
- (i)A plain scale can read a maximum of three consecutive units.
- (ii)The focus of a parabola is always equidistant from its vertex and directrix.
- (iii)In third-angle projection, the side view is always projected on the opposite side of the front view.
- (iv)A half-sectional view cuts exactly one-quarter of the object away to show internals.
- (v)When a point lies in the third quadrant, its top view is below the reference line xy.
PART-B
Marks – 75
4. (a) Write the following phrase in single stroke capital italic lettering. Height of characters must be 14 mm. Maintain uniformity of line weight, geometry, and tracking.
5
ENGINEERING BLUEPRINT
(b) Detail out the precise structural specifications and geometric applications for the following lines used in industrial drawings:
2×5=10
(i) Continuous thick
(ii) Chain thin long-dashed
(iii) Short dashed thin
(iv) Continuous thin with zig-zags
(v) Chain thin thick at ends
5. (a) Distinguish and explain with systemic layouts the working principles of the following systems:
3×3=9
- (i) Progressive dimensioning
- (ii) Coordinate dimensioning
- (iii) Aligned dimensioning syntax
(b) (i) Construct a regular octagon inside a given square measuring 80 mm on each side.
3×2=6
(ii) Draw an ellipse having a major axis of 100 mm and a minor axis of 60 mm using the concentric circles technique.
6. (a) A rectilineal plot of 250,000 square meters is mapped onto a sheet by a scaled down area measuring 10 square centimeters. Determine the scale factor (R.F.) and construct a diagonal scale tracking meters, decimeters, and centimeters up to a maximum stretch of 500 meters. Plot a structural mark of 347 meters on it.
8
(b) A straight line segment ‘MN’ has its terminal point M positioned 20 mm above H.P. and 30 mm in front of V.P. The secondary node N sits 65 mm above H.P. and 75 mm in front of V.P. The global horizontal distance between the end projections is measured at 60 mm. Generate the plan and elevation projections of line MN and compute its true dimensional length.
7
7.(a) A line AB 50 mm long, has its end A in both the H.P. and V.P. It is inclined at 30° to the H.P. and 45° to the V.P. Draw the projections of the line AB.
8
(b) Figure-1 shows the front view and top view of a frustum of a hexagonal pyramid. Draw the isometric projection of the pyramid.
7
Fig. 1
8.(a) Draw three views of a hexagonal nut for 24 mm diameter bolt according to rough rule/approximately standard dimensions.
2+2+2=6
(b) Sketch neatly, a sectional front view and top view of a single riveted butt joint for two 10 mm thick plates, using two butt straps. Show all dimensions on your sketch.
6+3=9
9. Fig.-2 shows a pictorial view of an object. Draw the following views :
6+5+4=15
- (a) Sectional front view
- (b) Top view and
- (c) Side view from left.
Fig.-2
END SEMESTER EXAMINATION, NOVEMBER-2018
Semester : 1st (odd) New syllabus
Subject Code : Sc-104
APPLIED PHYSICS – I
| Full Marks – 70 | Time – Three hours |
The figures in the margin indicate full marks
for the questions.
for the questions.
Instructions :
- All the questions of PART-A are compulsory.
- Answer any five questions from PART-B.
PART – A
Marks – 25
1. Fill in the blanks with appropriate words :
1×10=10
- (a) The dimensional formula for surface tension is ___________.
- (b) The number of significant figures in the value 0.00340 is ___________.
- (c) Surface tension is a ___________ quantity.
- (d) The SI unit of universal gravitational constant (G) is ___________.
- (e) Joule-second is the unit of ___________ .
- (f) The value of escape velocity from the surface of the earth is approximately ___________.
- (g) A liquid has specific gravity 0.8. Its absolute density in SI units is ___________.
- (h) The quantity of heat required to raise the temperature of 2 kg of water through 10°C is ___________ calorie.
- (i) The product of force and time duration for which it acts is equal to ___________.
- (j) Velocity of sound in an ideal gas is ___________ of the changes in its frequency.
2. Choose the correct answer from each of the following :
1×5=5
- (a) The physical quantity which has the same dimensional formula as that of work is :
- (b) Which of the following conditions is required for two vectors to be completely equal?
- (c) For a rigid body rotating steadily about a fixed axis, all its constituent particles have the same :
- (d) An object weighs 150 gm in air and 120 gm when completely immersed in water. The specific gravity of the object is :
- (e) Two sound waves have frequencies in the ratio of 3 : 1. If they travel through the same medium, the ratio of their wavelengths will be :
(i) power
(ii) torque
(iii) momentum
(iv) surface energy
(i) They must have the same unit and magnitude only.
(ii) They must be parallel and point in the same direction only.
(iii) They must possess identical magnitudes, units, and directions.
(iv) None of the above options is correct.
(i) linear speed
(ii) angular velocity
(iii) centripetal acceleration
(iv) linear momentum
(i) 1.25
(ii) 5.0
(iii) 3.5
(iv) 0.83
(i) 1 : 3
(ii) 3 : 1
(iii) 1 : 9
(iv) 9 : 1
3. Write true or false :
1×10=10
- (a) Random errors can be completely eliminated by taking the arithmetic mean of a large number of observations.
- (b) The numerical value of temperature on both the Fahrenheit and Kelvin scales can never be identical.
- (c) Quartz is considered to be a perfectly elastic substance compared to ordinary glass or metals.
- (d) Viscosity of liquids increases significantly with an increase in their ambient temperature.
- (e) The velocity of a transverse wave traveling along a stretched string depends directly on its linear mass density.
- (f) A simple pendulum oscillating under ideal conditions undergoes purely undamped simple harmonic motion.
- (g) Capillary action ceases to function completely if the entire setup is placed inside a perfect vacuum.
- (h) Escape velocity of an artificial satellite is completely independent of the total mass of that satellite.
- (i) The centripetal force acting on an orbiting body is directed radially outward from the center of rotation.
- (j) The coefficient of volume expansion for an isotropic solid is exactly three times its coefficient of linear expansion.
PART – B
Marks – 45
4.(a)
Define fundamental and derived dimensions. State the SI unit of solid angle.
1+1=2
(b)
Distinguish between systematic errors and random errors in experimental measurements.
2
(c)
Two vectors of magnitudes 8 units and 6 units act at an angle of 45° to each other. Calculate the magnitude and spatial direction of their resultant vector.
3
(d)
State Newton’s second law of motion. Show how it leads to the mathematical definition of force.
2
5.(a)
State the law of conservation of mechanical energy for a freely falling body.
1
(b)
A body of mass 25 kg is moving with a constant velocity. If a retarding force of 50 N acts on it for 3 seconds, find the reduction in its speed.
2
(c)
Derive an expression establishing the relationship between angular acceleration and linear acceleration.
2
(d)
Why is the outer edge of a curved railway track raised compared to the inner edge? A vehicle is negotiating a circular curve of radius 120 m banked at an angle of 15°. Determine the optimum safe speed to avoid slipping.
1+3=4
6.(a)
Define radius of gyration and angular momentum.
2
(b)
An object of mass 200 gm moves with a steady velocity of 15 m/s. Compute its kinetic energy.
1
(c)
A metallic wire of length 2 m is stretched by applying a load of 40 N. The cross-sectional area of the wire is 1×10−6 m2 and Young’s modulus (Y) is 1.5×1011 N/m2. Calculate (i) longitudinal stress, (ii) longitudinal strain, and (iii) total elongation produced in the wire.
1+1+1=3
(d)
State Kepler’s laws of planetary motion. Hence define the time period of a satellite.
2+1=3
7.(a)
State two main differences between streamline flow and turbulent flow of a liquid.
2
(b)
The diameters of the smaller and larger pistons of a hydraulic lift are 5 cm and 25 cm respectively. If a mechanical lever with an arm ratio of 5 : 1 is connected to the smaller piston, calculate the total upward force produced on the larger piston when a force of 40 kg is exerted at the handle of the lever.
3
(c)
60 gm of a liquid at 80°C is poured into a copper calorimeter of mass 100 gm containing water at 25°C. If the final steady temperature of the mixture is 40°C, calculate the specific heat capacity of the liquid. (Take water equivalent parameters accordingly).
2
(d)
Explain the physical distinction between conduction and convection modes of heat transmission.
2
8.(a)
Distinguish clearly between ultrasonic waves and infrasonic waves based on their properties and applications.
2
(b)
Derive the standard expression for Newton’s formula for the velocity of sound in a gas. State Laplace’s correction.
2
(c)
Find the percentage change in the velocity of sound in air when the ambient temperature rises from 27°C to 45°C.
2
(d)
Define the terms: pitch, loudness, and quality (timbre) of a musical sound note.
3
9.(a)
Define the coefficient of cubical expansion. Explain how its numerical value varies with changes in the scale of temperature.
1+2=3
(b)
State and explain the fundamental principles of a perfectly black body.
3
(c)
What do you understand by the term ‘thermal conductivity’ of a solid material?
1
(d)
Explain the underlying mechanism of resonance in sound waves with a suitable example.
2