Production Engi...

A welding operation is performed with an arc voltage of 40 V & current of 300 A at a welding speed of 9 mm/s. Assume that the arc efficiency is 75%. The net heat input per unit length of weld will be __________ kJ/mm

For orthogonal machining of a metal specimen, the given rake angle of tool is zero. The thrust force and cutting forces are 320 N and 510 N.

Using Taylor's tool life VT^0.5 = C, the tool life is calculated. Now cutting speed is halved, the percentage increase in the tool life is -

A metal sheet of thickness 0.8 mm is to be drawn in a cup of circular cross-section with diameter 35 mm and height 55 mm. The reduction ratio is 45 % for first, 35 % for second and 30 % for next successive draws, choose the correct option(s)

A mild steel block of width 40 mm is being milled using a straight slab cutter 70 mm diameter with 30 teeth. If the cutter rotates at 40 rpm, and depth of cut is 2 mm, what is the value of maximum uncut chip thickness when the table feed is 20 mm / min?

A shaft hold system is 30 H₇/f₈. The type of fit it has \((i = 0.45\sqrt[3]{D} + 0.001D,\;IT7 = 16i,\;IT8 = 25i)\)

 Upper deviation for ‘f’ shaft = - 5.5 D^0.41

 An orthogonal cutting operation is being carried out under the following conditions : Cutting Speed = 2 m/sec, Depth of cut = 0.5 mm, Chip thickness = 0.6 mm. What is the chip velocity? 

In an experiment to study the effect of friction of roll surface on the draft two different rolling operations were carried out with identical roll size. Coefficient of friction in one case was 8% more than the other. What will be the percentage increment in maximum reduction per pass using the roll with higher friction?

A solid cylindrical workpiece has an initial diameter of 200 mm and height 160 mm. The workpiece is reduced by 50% in height in an open die forging operation.

A linear voltage length characteristic is V = (25 + 50L) volts, where L is in cm. The V-I characteristic is linear with open-circuit voltage of 100 V and short-circuit current of 500 A. The arc length is 0.4 cm.

In the electrochemical machining of a cast iron surface that is 25 mm × 25 mm in the cross-section using NaCl in water as electrolyte, the Gap between the tool and work piece is 0.25 mm. The supply voltage is 12 V DC. The specific resistance of electrolyte is 3 Ω cm. The electrode feed rate (in mm/min) will be

Take valency of iron (Z) = 2 and atomic weight A = 55.85, \({{\rho _{iron}} = 7860\frac{{kg}}{{{m^3}}}} \)

Cylindrical block has volume equal to that of a spherical block. The radius of both block is equal to 7 cm. The solidification time for cylindrical block is 60 seconds.

An orthogonal cutting operation is being carried out in which uncut chip thickness is 0.40 mm, cutting speed is 160 m/min, rake angle is 12°. It was observed that the chip thickness is 1.6 mm, the cutting force is 80 N & the thrust force is 20 N. Find the shear power ­­________ (in kW)?

Match the following

For machining mild steel, with a speed of 50 m/min, a tool life of 50 minutes is obtained, and when the cutting speed was 80 m/min, the tool life was 15 minutes. The time required to change a tool is 10 minutes. The machining cost is Rs. 5/min and tool cost is Rs. 80

The voltage – length characteristic of a direct current (dc) arc is given by

V = (20 + 40l) volts, where l is the length of arc in cm. The power source characteristic is approximated by a straight line with an open circuit voltage = 80 V and a short circuit current = 1000 A. The arc power (kVA) at the optimum arc length is ____________.

A unit square is transformed using a 2 x 2 transformation matrix. The resulting position vectors of the square are:

\(\left[ {\begin{array}{*{20}{c}}0&0\\2&3\\8&4\\6&1\end{array}} \right]\)