MCQOPTIONS
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MCQOPTIONS
This section includes 382 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The wire EDM process is used for making moulds with high drafted walls. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 102. |
The selection of the manufacturing process depends upon |
| A. | chemical reactivity between the mould material and the di-electric fluid |
| B. | mould shape |
| C. | application of the mould |
| D. | number of parts to be machined |
| Answer» C. application of the mould | |
| 103. |
How many ways are there for making the fixed cores by wire cut EDM process? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 104. |
Which of the following machining process is usually preferred for cutting of ejectors which are used in mould making? |
| A. | milling |
| B. | hobbing |
| C. | wire-cut edm |
| D. | die sink edm |
| Answer» D. die sink edm | |
| 105. |
Which of the following is not the application of wire cut EDM process? |
| A. | machining ejector holes |
| B. | cutting the ejector pins |
| C. | machining cores of various moulds |
| D. | machining of complex shapes made of plastic |
| Answer» E. | |
| 106. |
During mould making by wire cut EDM, it is important to harden to counter the effects of changes in the shape of the workpiece due to heat treatment. |
| A. | the insert |
| B. | electrode wire |
| C. | electrode holding coils |
| D. | bolting points in the workpiece |
| Answer» B. electrode wire | |
| 107. |
is/are used as di-electric fluid in die sink EDM process. |
| A. | pure water |
| B. | silicone gel |
| C. | petroleum products |
| D. | epoxy resins |
| Answer» D. epoxy resins | |
| 108. |
For machining of high melting point materials, wires are used. |
| A. | gallium |
| B. | zinc coated |
| C. | aluminium coated |
| D. | silver |
| Answer» C. aluminium coated | |
| 109. |
grades wire are used in automatic re-threading mechanisms. |
| A. | malleable |
| B. | softer |
| C. | harder |
| D. | commercial |
| Answer» D. commercial | |
| 110. |
The electrode wires are usually made form |
| A. | graphite |
| B. | iron |
| C. | nickel |
| D. | brass |
| Answer» E. | |
| 111. |
Wires used in wire cut EDM are usually disposed after one usage. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 112. |
Sparking gap is the distance between |
| A. | the workpiece and the cnc table |
| B. | the workpiece and the electrode wire |
| C. | the electrode wire and the di-electric fluid |
| D. | the workpiece and the spark plug |
| Answer» C. the electrode wire and the di-electric fluid | |
| 113. |
The absolute minimum inner corner radius is |
| A. | the wire radius minus the sparking gap width |
| B. | the sparking gap width minus the wire radius |
| C. | the wire radius plus the sparking gap width |
| D. | double of the wire radius |
| Answer» D. double of the wire radius | |
| 114. |
During wire cut EDM, the size of the cavity produced by the wire while machining depends upon |
| A. | material of the workpiece |
| B. | di-electric fluid used |
| C. | wire material |
| D. | electric current |
| Answer» E. | |
| 115. |
The only difference between die-sink EDM and wire cut EDM is the |
| A. | way of material removal |
| B. | electrode used for the machining |
| C. | type of materials machined |
| D. | processing time |
| Answer» C. type of materials machined | |
| 116. |
Wire electric discharge (ED) machining is based on the same principle as that of |
| A. | hydro-dynamic edm |
| B. | die-sink edm |
| C. | polar edm |
| D. | non-conventional edm |
| Answer» C. polar edm | |
| 117. |
In wire-cut EDM, a moving wire is used to |
| A. | remove the burr |
| B. | cut complex outlines |
| C. | melt the material |
| D. | make the way for the di-electric fluid |
| Answer» C. melt the material | |
| 118. |
How many subsystems are there in wire-cut EDM process? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 119. |
Di-electric system used in WEDM process is similar to that of the process. |
| A. | conventional drilling |
| B. | conventional milling |
| C. | conventional edm |
| D. | broaching |
| Answer» D. broaching | |
| 120. |
WEDM process can be used for manufacturing of micro-tools. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 121. |
For which of the following materials wire-cut EDM is not used? |
| A. | aluminium |
| B. | zirconium |
| C. | steels |
| D. | titanium |
| Answer» C. steels | |
| 122. |
WEDM process can be used for cutting hard extrusion dies. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 123. |
Wire-cut EDM (WEDM) process is widely used for |
| A. | alloy steels |
| B. | tool steels |
| C. | stainless steels |
| D. | carbon steels |
| Answer» C. stainless steels | |
| 124. |
The burr or cut particles are flushed away by the |
| A. | electrode |
| B. | motion of the workpiece |
| C. | di-electric fluid |
| D. | coolant |
| Answer» D. coolant | |
| 125. |
The di-electric fluid gets ionizes in between gap. |
| A. | tool-electrode |
| B. | cathode-anode |
| C. | workpiece-electrode |
| D. | tool-workpiece |
| Answer» B. cathode-anode | |
| 126. |
Electrically conductive materials are cut by WEDM process by mechanism. |
| A. | thermal |
| B. | electro-thermal |
| C. | electro-dynamic |
| D. | fused metal |
| Answer» C. electro-dynamic | |
| 127. |
During the WEDM process, workpiece undergoes a number of thermal cycles. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 128. |
The WEDM process requires |
| A. | lower initial investment |
| B. | lesser cutting forces |
| C. | a skilled operator |
| D. | a coolant pump |
| Answer» C. a skilled operator | |
| 129. |
In the wire-cut EDM process, water is also used for |
| A. | cooling |
| B. | increasing the feed rate |
| C. | flushing away the burr |
| D. | controlling the cutting speed |
| Answer» D. controlling the cutting speed | |
| 130. |
In the wire-cut EDM process, de-ionizing units are used for controlling the |
| A. | feed rate |
| B. | resistivity |
| C. | burr formation |
| D. | temperature of the wire |
| Answer» C. burr formation | |
| 131. |
The upper guide can move independently about |
| A. | x-axis |
| B. | y-axis |
| C. | x-y-w axes |
| D. | z-u-v axes |
| Answer» E. | |
| 132. |
In WEDM, the wire is held tight between |
| A. | upper and lower nozzles |
| B. | upper and lower diamond guides |
| C. | upper and lower groves in the handle |
| D. | upper and lower pulleys |
| Answer» C. upper and lower groves in the handle | |
| 133. |
Wire-cut EDM can cut plates of thickness upto |
| A. | 50mm |
| B. | 100mm |
| C. | 300mm |
| D. | 500mm |
| Answer» D. 500mm | |
| 134. |
A thin metallic wire used in wire-cut EDM is kept submerged in a tank of |
| A. | dielectric fluid |
| B. | pure water |
| C. | molten metal |
| D. | kerosene |
| Answer» B. pure water | |
| 135. |
Reduction in the electrical energy consumption will have impact on which aspects mentioned below? |
| A. | environmental |
| B. | economic |
| C. | environmental & economic |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 136. |
What happens to the Electro discharge machining process under unfavourable working conditions? |
| A. | will remain stable |
| B. | explosion may occur |
| C. | machining rate increases |
| D. | nothing happens |
| Answer» C. machining rate increases | |
| 137. |
How are EDM’s levels of integration when compared to conventional machining? |
| A. | slower rate |
| B. | faster rate |
| C. | same rate |
| D. | none of the mentioned |
| Answer» B. faster rate | |
| 138. |
What are the feed rates used in WEDG process? |
| A. | 1 to 5 mm/min |
| B. | 5 to 10 mm/min |
| C. | 10 to 15 mm/min |
| D. | 15 to 20 mm/min |
| Answer» C. 10 to 15 mm/min | |
| 139. |
What are the values of hole diameters obtained using Wire electro discharge grinding? |
| A. | 1 µm |
| B. | 3 µm |
| C. | 5 µm |
| D. | 7 µm |
| Answer» D. 7 µm | |
| 140. |
What are the machining rates used in Micro-EDM process? |
| A. | 0.1 to 2 mm/min |
| B. | 1 to 20 mm/min |
| C. | 10 to 200 mm/min |
| D. | 100 to 500 mm/min |
| Answer» C. 10 to 200 mm/min | |
| 141. |
What are the values of depths that can be machined using Micro-EDM? |
| A. | 1 mm |
| B. | 10 mm |
| C. | 100 mm |
| D. | 1000 mm |
| Answer» D. 1000 mm | |
| 142. |
What is the value of depth to diameter ratio in Micro-Electro discharge machining process? |
| A. | 10:1 |
| B. | 5:2 |
| C. | 4:3 |
| D. | 2:1 |
| Answer» B. 5:2 | |
| 143. |
What happens to the machine capital cost in EDT when there is an increase in tool quantity? |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» C. remains same | |
| 144. |
What are the spindle rotation speeds used in EDT? |
| A. | 1 to 4 rpm |
| B. | 10 to 40 rpm |
| C. | 20 to 60 rpm |
| D. | 30 to 90 rpm |
| Answer» C. 20 to 60 rpm | |
| 145. |
Which of the following are the process variables for texturing process in EDM? |
| A. | pulse current |
| B. | electrode polarity |
| C. | dielectric type |
| D. | all of the mentioned |
| Answer» E. | |
| 146. |
What are duration values of current amplitude in EDT? |
| A. | 0.1 to 1 µs |
| B. | 1 to 10 µs c) 10 to 100 µs |
| C. | 100 to 1000 µs |
| Answer» D. | |
| 147. |
Texturing is applied to the steel sheets at which stages of cold rolling? |
| A. | initial stages |
| B. | middle stages |
| C. | final stages |
| D. | all of the mentioned |
| Answer» B. middle stages | |
| 148. |
What are the values of current amplitudes used in EDT? |
| A. | 0.2 to 1 a |
| B. | 2 to 10 a |
| C. | 20 to 100 a |
| D. | 40 to 200 a |
| Answer» C. 20 to 100 a | |
| 149. |
What is the full form of EDT in EDM processes? |
| A. | electro discharge tinplating |
| B. | electro discharge texturing |
| C. | electro discharge tapping |
| D. | electro discharge turing |
| Answer» C. electro discharge tapping | |
| 150. |
Sparks occur between which of the following components? |
| A. | work piece and sheet metal |
| B. | tool electrode and sheet metal |
| C. | work piece and electrode |
| D. | none of the mentioned |
| Answer» C. work piece and electrode | |