# The piston rod of diameter 20 mm and length 700 mm in a hydraulic cylinder is subjected to a compressive force of 10 kN due to the internal pressure. The end conditions for the rod may be assumed as guided at the piston end and hinged at the other end. The Young's modulus is 200 GPa. The factor of safety for the

1.  0.68

2.  2.75

3.  5.62

4.  11.0

4

0.68

Explanation :
No Explanation available for this question

# In electro discharge machining (EDM), if the thermal conductivity of tool is high and the specific heat of work piece is low, then the tool wear rale and material removal rate are expected to be respectively

1.  high and high

2.  low and low

3.  high and low

4.  low and high

4

high and high

Explanation :
No Explanation available for this question

# In orthogonal turning of medium carbon steel, the specific machining energy is 2.0 J/mm3.The cutting velocity, feed and depth of cut are 120 m/min, 0.2 mm/rev and 2 mm respectively. The main cutting force in N is

1.  40

2.  80

3.  400

4.  800

4

800

Explanation :
No Explanation available for this question

# A direct current welding machine with a linear power source characteristic provides open circuit voltage of 80 V and short circuit current of 800 A. During welding with the machine, the measured arc current is 500 A corresponding to an arc length of 5.0 mm and the measured arc current is 460 A corresponding to an arc length of 7.0 mm. The linear voltage (E) - arc length (L) characteristic of the welding arc can be given as (where E is in Volt and L is in mm)

1.  E = 20 + 2L

2.  E = 20 + 8L

3.  E = 80 + 2L

4.  E = 80 + 8L

4

E = 20 + 2L

Explanation :
No Explanation available for this question

# A hole is specified as 40°1100 mm. The mating shaft has a clearance fit with minimum clearance of 0.01 mm. The tolerance on the shaft is 0.04 mm. The maximum clearance in mm between the hole and the shaft is

1.  0.04

2.  0.05

3.  0.10

4.  0.11

4

0.10

Explanation :
No Explanation available for this question

# In orthogonal turning of low carbon steel pipe with principal cutting edge angle of 90°, the main cutting force is 1000 N and the feed force is 800 N. The shear angle is 25° and orthogonal rake angle is zero. Employing Merchant's theory, the ratio of friction force to normal force acting on the cutting tool

1.  1.56

2.  1.25

3.  0.80

4.  0 64

4

0.80

Explanation :
No Explanation available for this question

# Two metallic sheets, each of 2.0 mm thickness, are welded in a lap joint configuration by resistance spot welding at a welding current of 10 kA and welding lime of 10 milli second. A spherical fusion zone extending up to the full thickness of each sheet is formed. The properties of the metallic sheets are given as: ambient temperature = 293 K melting temperature = 1793 K  density = 7000 kg/m1  latent heal of fusion = 300 kj/kg specific heat = 800 J/kg K Assume : (i) contact resistance along sheet-sheet interface is 500 micro-ohm and along electrode-sheet interface is zero; (ii) no conductive heat loss through the bulk sheet materials; and (lii) the complete weld fusion zone is at the melting temperature. The melting efficiency (in %) of the process is

1.  50.37

2.  60.37

3.  70.37

4.  80.37

4

70.37

Explanation :
No Explanation available for this question

# Capacities of production of an item over 3 consecutive months in regular time are 100,100 and 80 and in overtime are 20,20 and 40. The demands over those 3 months are 90,130 and 110. The cost of production in regular lime and overtime are respectively Rs. 20 per item and Rs. 24 per item. Inventory carrying cost is Rs. 2 per item per month. The levels of starting and final inventory are nil. Backorder is not permitted. For minimum cost of plan, the level of planned production in overtime in the third month is

1.  40

2.  30

3.  20

4.  0

4

30

Explanation :
No Explanation available for this question

# In open-die forging, a disc of diameter 200 mm and height 60 mm is compressed without any barreling effect. The final diameter of the disc is 400 mm. The true strain is

1.  1.986

2.  1-686

3.  1-386

4.  0.602

4

1-386

Explanation :
No Explanation available for this question

1.  5.936

2.  7.936

3.  8.936

4.  9.936

4