The frontal working area of the electrode in an ECM operation is 2000 mm2. The applied current is 2000 amps and the voltage is 12 volts. The material being cut is nickel (valence = 2, CNi =3.42x10-2mm/A-s). (a) If the process is 90% efficient, determine the cutting rate into the workpart. (b) If the resistivity of the electrolyte is 160 ohm – mm, determine the working gap. Tool feed Tool holder and

What is the impact on availability as the mean time between failures (MTTR) approaches zero? Is it possible to adequately describe this situation?

What would be the grating constant for a grating with 300 lines/mm? (Express the constant in nanometers).

Calculate the material removal rate and electrode feed rate in the electrochemical machining of an iron surface that is 25 mm × 25 mm in cross-section, using NaCl in water as electrolyte. The gap between the tool and the work-piece is 0.25 mm. The supply voltage is 12 volt D.C. The specific resistance of electrolyte is 3 2 cm. Take for iron: Valency = 2, Atomic weight = 55.85,Density = 7860 kg/m³.

114 About industrial piping: HOW ARE EXPANSION JOINT CALCULATIONS MADE?

Describe the meaning of each part of the following FCAwelding electrode identification: E81T-5

O b. 2:1 Oc. 1:2 O d. T: 1 QUESTION 10 What is the maximum tensile load P that can be applied to the bolted joint if the bolt diameter is 20 mm and the shear strength of the bolt material is 120 MNm 2 ? Apply a 'safety factor' of 1.2 in your calculations. Note: Please read about 'safety factors' and how they are applied in calculations. O a. 26.4 Nm2 O b. 26.4 kN O c. 62.5 kN O d. 62.5 MNm2 QUESTION 11

What form of energy is used in electrosugical cutting? 2. What are the modes of electrosurgery?