MCQOPTIONS
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MCQOPTIONS
This section includes 180 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. |
In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become |
| A. | half |
| B. | two times |
| C. | eight times |
| D. | sixteen times |
| Answer» E. | |
| 102. |
The cutting speed of a drill depends upon the |
| A. | material of drill |
| B. | type of material to be drilled |
| C. | quality of surface finish desired |
| D. | all of these |
| Answer» E. | |
| 103. |
In drilling brass, a drill with |
| A. | zero helix angle is used |
| B. | low helix angle is used |
| C. | high helix angle is used |
| D. | any helix angle can be used |
| Answer» C. high helix angle is used | |
| 104. |
The abrasive recommended for grinding materials of low tensile strength is |
| A. | silicon carbide |
| B. | aluminium oxide |
| C. | sand stone |
| D. | diamond |
| Answer» B. aluminium oxide | |
| 105. |
The angle between the face and flank of the single point cutting tool is known as |
| A. | rake angle |
| B. | clearance angle |
| C. | lip angle |
| D. | point angle |
| Answer» D. point angle | |
| 106. |
In order to obtain a surface finish in the range of 0.75 μm to 1.25 μm , the operation used is called. |
| A. | grinding |
| B. | lapping |
| C. | honing |
| D. | buffing |
| Answer» B. lapping | |
| 107. |
In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is |
| A. | depth of cut |
| B. | cutting speed |
| C. | feed |
| D. | tool rake angle |
| Answer» D. tool rake angle | |
| 108. |
In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called |
| A. | friction zone |
| B. | work-tool contact zone |
| C. | shear zone |
| D. | none of these |
| Answer» B. work-tool contact zone | |
| 109. |
The drill spindles are provided with standard taper known as |
| A. | Morse taper |
| B. | Seller's taper |
| C. | Chapman taper |
| D. | Brown and Sharpe taper |
| Answer» B. Seller's taper | |
| 110. |
Chemical milling operation is performed |
| A. | on universal milling machine |
| B. | on plain milling machine |
| C. | in a tank containing an etching solution |
| D. | any one of these |
| Answer» D. any one of these | |
| 111. |
The broaching operation in which the work moves past the stationary tool is called |
| A. | pull broaching |
| B. | push broaching |
| C. | surface broaching |
| D. | continuous broaching |
| Answer» E. | |
| 112. |
In transverse grinding |
| A. | the work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face |
| B. | the work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face |
| C. | the work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face |
| D. | the work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face |
| Answer» B. the work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face | |
| 113. |
The parameter which completely defines the chip formation in a metal cutting process is |
| A. | shear angle |
| B. | chip-tool contact length |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 114. |
The usual value of the point angle of a drill is |
| A. | 70° |
| B. | 100° |
| C. | 118° |
| D. | 130° |
| Answer» D. 130° | |
| 115. |
The process of improving the cutting action of the grinding wheel is called |
| A. | truing |
| B. | dressing |
| C. | facing |
| D. | clearing |
| Answer» C. facing | |
| 116. |
In the relation = , the value of n for high speed steel tools varies from 0.25 to 0.40. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 117. |
The usual value of the helix angle of a drill is |
| A. | 20° |
| B. | 30° |
| C. | 45° |
| D. | 60° |
| Answer» C. 45° | |
| 118. |
Broaching is applied for machining |
| A. | internal and external surfaces |
| B. | round or irregular shaped holes |
| C. | external flat and contoured surfaces |
| D. | all of these |
| Answer» E. | |
| 119. |
The advantage of a broaching operation is that |
| A. | rate of production is very high |
| B. | high accuracy and high class of surface finish is possible |
| C. | roughing and finishing cuts are completed in one pass of the tool |
| D. | all of the above |
| Answer» E. | |
| 120. |
Which of the following statement is correct about nose radius? |
| A. | It improves tool life |
| B. | It improves the surface finish |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 121. |
The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min. |
| A. | mild steel |
| B. | copper |
| C. | aluminium |
| D. | brass |
| Answer» B. copper | |
| 122. |
The chuck preferred for quick setting and accurate centering of a job is |
| A. | four jaw independent chuck |
| B. | collect chuck |
| C. | three jaw universal chuck |
| D. | magnetic chuck |
| Answer» C. three jaw universal chuck | |
| 123. |
Negative rakes are used for |
| A. | carbide tools |
| B. | heavy loads |
| C. | harder materials |
| D. | all of these |
| Answer» E. | |
| 124. |
A bottoming tap has |
| A. | its end tapered for about three or four threads |
| B. | its end tapered for about eight or ten threads |
| C. | full threads for the whole of its length |
| D. | none of the above |
| Answer» D. none of the above | |
| 125. |
Tumbler gears in lathe are used to |
| A. | reduce the spindle speed |
| B. | cut gears |
| C. | give desired direction of movement to the lathe carriage |
| D. | drill a workpiece |
| Answer» D. drill a workpiece | |
| 126. |
Hard and tough materials like cast iron should be turned at |
| A. | slow speed |
| B. | high speed |
| C. | any speed |
| D. | certain specific speed |
| Answer» B. high speed | |
| 127. |
In oblique cutting system, the cutting edge of the tool |
| A. | may clear the width of the workpiece |
| B. | may or may not clear the width of the workpiece |
| C. | may not clear the width of the workpiece |
| D. | should always clear the width of the workpiece |
| Answer» D. should always clear the width of the workpiece | |
| 128. |
When the shear angle is small |
| A. | path of shear is short and chip is thin |
| B. | path of shear is large and chip is thick |
| C. | path of shear is short and chip is thick |
| D. | path of shear is large and chip is thin |
| Answer» C. path of shear is short and chip is thick | |
| 129. |
A fine grained grinding wheel is used to grind |
| A. | hard and brittle materials |
| B. | soft and ductile materials |
| C. | hard and ductile materials |
| D. | soft and brittle materials |
| Answer» B. soft and ductile materials | |
| 130. |
In a shaper |
| A. | tool is stationary and work reciprocates |
| B. | work is stationary and tool reciprocates |
| C. | tool moves over stationary work |
| D. | tool moves over reciprocating work |
| Answer» C. tool moves over stationary work | |
| 131. |
Which of the following statement is correct about EDM machining? |
| A. | It can machine hardest materials. |
| B. | It produces high degree of surface finish. |
| C. | The tool and work are never in contact with each other. |
| D. | all of these |
| Answer» E. | |
| 132. |
A better machinable metal is one which gives |
| A. | lower chip-tool contact area and larger shear angle |
| B. | higher chip-tool contact area and smaller shear angle |
| C. | lower chip-tool contact area and smaller shear angle |
| D. | higher chip-tool contact area and larger shear angle |
| Answer» B. higher chip-tool contact area and smaller shear angle | |
| 133. |
Ceramic cutting tools are |
| A. | made by cold pressing of aluminium oxide powder |
| B. | available in the form of tips |
| C. | brittle and have low bending strength |
| D. | all of these |
| Answer» E. | |
| 134. |
Which of the following statement is correct about hot machining? |
| A. | It requires less power than machining metals at room temperature. |
| B. | The rate of tool wear is lower. |
| C. | It is used for machining high strength and high temperature resistant materials. |
| D. | all of the above |
| Answer» E. | |
| 135. |
Lathe bed is made of |
| A. | mild steel |
| B. | alloy steel |
| C. | pig iron |
| D. | chilled cast iron |
| Answer» E. | |
| 136. |
In metal machining, the zone where the maximum heat is generated due to the plastic deformation of metal, is called |
| A. | friction zone |
| B. | work-tool contact zone |
| C. | shear zone |
| D. | none of these |
| Answer» D. none of these | |
| 137. |
The operation of making a cone-shaped enlargement of the end of a hole is known as |
| A. | counter-sinking |
| B. | counter-boring |
| C. | trepanning |
| D. | spot facing |
| Answer» B. counter-boring | |
| 138. |
In a shaper, the metal is removed during |
| A. | forward stroke |
| B. | return stroke |
| C. | both the forward and return strokes |
| D. | neither the forward nor the return stroke |
| Answer» B. return stroke | |
| 139. |
Which of the following statement is correct in regard to centreless grinding? |
| A. | The workpiece is supported throughout its entire length as grinding takes place. |
| B. | It is a continuous process and adopted for production work. |
| C. | It requires no holding device for the work. |
| D. | all of the above |
| Answer» E. | |
| 140. |
Which of the following parameters govern the value of shear angle in continuous chip formation? |
| A. | True feed |
| B. | Chip thickness |
| C. | Rake angle of the cutting tool |
| D. | all of these |
| Answer» E. | |
| 141. |
The relief or clearance at the cutting edge of a flat drill varies from |
| A. | 3° to 8° |
| B. | 20° to 30° |
| C. | 60° to 90° |
| D. | 90° to 120° |
| Answer» B. 20° to 30° | |
| 142. |
The aluminium oxide abrasive is chiefly used for grinding |
| A. | high speed steel |
| B. | carbon steel |
| C. | wrought iron |
| D. | all of these |
| Answer» E. | |
| 143. |
For turning small taper on long workpiece, the suitable method is |
| A. | by a form tool |
| B. | by setting over the tail stock |
| C. | by a taper turning attachment |
| D. | by swivelling the compound rest |
| Answer» C. by a taper turning attachment | |
| 144. |
The time (in minutes) for a drilling a hole is given by where is the |
| A. | length of the drill |
| B. | drill diameter |
| C. | flute length of the drill |
| D. | cone height of the drill |
| Answer» E. | |
| 145. |
The average cutting speed for turning mild steel with a high speed steel tool is |
| A. | 15 to 19 m/min |
| B. | 25 to 31 m/min |
| C. | 60 to 90 m/min |
| D. | 90 to 120 m/min |
| Answer» C. 60 to 90 m/min | |
| 146. |
The vector sum of cutting velocity and chip velocity is __________ shear velocity. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» B. less than | |
| 147. |
For harder alloy steel, the point angle of the drill is kept |
| A. | equal to 118° |
| B. | less than 118° |
| C. | more than 118° |
| D. | any one of these |
| Answer» D. any one of these | |
| 148. |
In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be |
| A. | doubled |
| B. | halved |
| C. | quadrupled |
| D. | unchanged |
| Answer» B. halved | |
| 149. |
The tool life is said to be over if |
| A. | poor surface finish is obtained |
| B. | there is sudden increase in cutting forces and power consumption |
| C. | overheating and fuming due to heat of friction starts |
| D. | all of the above |
| Answer» E. | |
| 150. |
Continuous chips with built up edge are formed during machining of |
| A. | brittle metals |
| B. | ductile metals |
| C. | hard metals |
| D. | soft metals |
| Answer» C. hard metals | |