MCQOPTIONS
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MCQOPTIONS
This section includes 800 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. |
During normalizing process of steel, the specimen is heated |
| A. | Between the upper and lower critical temperature and cooled in still air. |
| B. | Above the upper critical temperature and cooled in furnace. |
| C. | Above the upper critical temperature and cooled in still air. |
| D. | Between the upper and lower critical temperature and cooled in furnace. |
| Answer» D. Between the upper and lower critical temperature and cooled in furnace. | |
| 102. |
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 | |
| 103. |
Shrinkage allowance on pattern is provided to compensate for shrinkage when |
| A. | The temperature of liquid metal drops from pouring to freezing temperature |
| B. | The metal changes from liquid to solid state at freezing temperature |
| C. | The temperature of solid phase drops from freezing to room temperature |
| D. | The temperature of metal drops from pouring to room temperature |
| Answer» D. The temperature of metal drops from pouring to room temperature | |
| 104. |
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. | |
| 105. |
Carbide tipped tools usually have |
| A. | Negative rake angle |
| B. | Positive rake angle |
| C. | Any rake angle |
| D. | No rake angle |
| Answer» B. Positive rake angle | |
| 106. |
During the execution of a CNC part program block NO20 GO2 X45.0 Y25.0 R5.0 ; the type of tool motion will be |
| A. | Circular Interpolation − clockwise |
| B. | Circular Interpolation − counter clockwise |
| C. | Linear Interpolation |
| D. | Rapid feed |
| Answer» B. Circular Interpolation − counter clockwise | |
| 107. |
In which of the following machine, the work rotates and the tool is stationary? |
| A. | Vertical boring machine |
| B. | Horizontal boring machine |
| C. | Precision boring machine |
| D. | Jig boring machine |
| Answer» B. Horizontal boring machine | |
| 108. |
As the cutting speed increases, the tool cutting forces |
| A. | Remain constant |
| B. | Increases |
| C. | Decreases |
| D. | First increases and then decreases |
| Answer» D. First increases and then decreases | |
| 109. |
In machining metals, chips break due to __________ of work material. |
| A. | Toughness |
| B. | Ductility |
| C. | Elasticity |
| D. | Work hardening |
| Answer» E. | |
| 110. |
The rake angle of a single point cutting tool corresponds to _________ of a twist drill. |
| A. | Lip clearance angle |
| B. | Helix angle |
| C. | Point angle |
| D. | Chisel edge angle |
| Answer» C. Point angle | |
| 111. |
The strength of a brazed joint |
| A. | Decreases with increase in gap between the two joining surfaces |
| B. | Increases with increase in gap between the two joining surfaces |
| C. | Decreases up to certain gap between the two joining surfaces beyond which it increases |
| D. | Increases up to certain gap between the two joining surfaces beyond which it decreases |
| Answer» E. | |
| 112. |
The operation in which oil is permeated into the pores of a powder metallurgy product is known as |
| A. | Mixing |
| B. | Sintering |
| C. | Impregnation |
| D. | Infiltration |
| Answer» D. Infiltration | |
| 113. |
Which of the following operation is first performed? |
| A. | Spot facing |
| B. | Boring |
| C. | Tapping |
| D. | Drilling |
| Answer» E. | |
| 114. |
The velocity of tool along the tool face is known as |
| A. | Shear velocity |
| B. | Chip velocity |
| C. | Cutting velocity |
| D. | Mean velocity |
| Answer» C. Cutting velocity | |
| 115. |
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 | |
| 116. |
The main purpose of a boring operation, as compared to drilling, is to |
| A. | Drill a hole |
| B. | Finish the drilled hole |
| C. | Correct the hole |
| D. | Enlarge the existing hole |
| Answer» E. | |
| 117. |
The factor responsible for the formation of discontinuous chips is |
| A. | Low cutting speed and large rake angle |
| B. | Low cutting speed and small rake angle |
| C. | High cutting speed and large rake angle |
| D. | High cutting speed and small rake angle |
| Answer» C. High cutting speed and large rake angle | |
| 118. |
The cutting force in up milling ________ per tooth movement of the cutter. |
| A. | Is zero |
| B. | Is maximum |
| C. | Decreases from maximum to zero |
| D. | Increases from zero to maximum |
| Answer» E. | |
| 119. |
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 | |
| 120. |
A grinding wheel is said to be of _________ if it holds the abrasive grains more securely. |
| A. | Soft grade |
| B. | Medium grade |
| C. | Hard grade |
| D. | None of these |
| Answer» D. None of these | |
| 121. |
The tool material, for faster machining, should have |
| A. | Wear resistance |
| B. | Red hardness |
| C. | Toughness |
| D. | All of these |
| Answer» E. | |
| 122. |
The lip angle is the angle |
| A. | Between the tool face and the ground end surface of flank |
| B. | Made by the face of the tool and the plane parallel to the base of the cutting tool |
| C. | Between the face of the tool and a line tangent to the machined surface at the cutting point |
| D. | None of the above |
| Answer» B. Made by the face of the tool and the plane parallel to the base of the cutting tool | |
| 123. |
In orthogonal turning of a low carbon steel bar of diameter 150 mm with uncoated carbide tool, the cutting velocity is 90 m/min. The feed is 0.24 mm/rev and the depth of cut is 2 mm. The chip thickness obtained is 0.48 mm. If the orthogonal rake angle is zero and the principle cutting edge angle is 90⁰, the shear angle in degree is |
| A. | 20.56 |
| B. | 26.56 |
| C. | 30.56 |
| D. | 36.56 |
| Answer» C. 30.56 | |
| 124. |
For fast removal of materials during grinding, a _________ grinding wheel is used. |
| A. | Course grained |
| B. | Fine grained |
| C. | Medium grained |
| D. | None of these |
| Answer» B. Fine grained | |
| 125. |
The angle made by the face of the tool and the plane parallel to the base of cutting tool is called |
| A. | Rake angle |
| B. | Cutting angle |
| C. | Clearance angle |
| D. | Lip angle |
| Answer» B. Cutting angle | |
| 126. |
A process of removing metal by pushing or pulling a cutting tool is called |
| A. | Up milling |
| B. | Down milling |
| C. | Forming |
| D. | Broaching |
| Answer» E. | |
| 127. |
The grinding operation is a |
| A. | Shaping operation |
| B. | Forming operation |
| C. | Surface finishing operation |
| D. | Dressing operation |
| Answer» D. Dressing operation | |
| 128. |
Down milling is also called |
| A. | Conventional milling |
| B. | Climb milling |
| C. | End milling |
| D. | Face milling |
| Answer» C. End milling | |
| 129. |
Two plates of the same metal having equal thickness are to be butt welded with electric arc. When the plate thickness changes, welding is achieved by |
| A. | Adjusting the current |
| B. | Adjusting the duration of current |
| C. | Changing the electrode size |
| D. | Changing the electrode coating |
| Answer» D. Changing the electrode coating | |
| 130. |
The operation of machining several surfaces of a workpiece simultaneously is called |
| A. | Profile milling |
| B. | Gang milling |
| C. | Saw milling |
| D. | Helical milling |
| Answer» C. Saw milling | |
| 131. |
The work or surface speed for cylindrical grinding varies from |
| A. | 5 to 10 m/min |
| B. | 10 to 20 m/min |
| C. | 20 to 30 m/min |
| D. | 40 to 60 m/min |
| Answer» D. 40 to 60 m/min | |
| 132. |
The purpose of jigs and fixtures is to |
| A. | Increase machining accuracy |
| B. | Facilitate interchangeability |
| C. | Decrease expenditure on quality control |
| D. | All of these |
| Answer» E. | |
| 133. |
Allowance in limits and fits refers to |
| A. | Maximum clearance between shaft and hole |
| B. | Minimum clearance between shaft and hole |
| C. | Difference between maximum and minimum sizes of hole |
| D. | Difference between maximum and minimum sizes of shaft |
| Answer» C. Difference between maximum and minimum sizes of hole | |
| 134. |
The maximum possible draft in cold rolling of sheet increases with the |
| A. | Increase in coefficient of friction |
| B. | Decrease in coefficient of friction |
| C. | Decrease in roll radius |
| D. | Decrease in roll velocity |
| Answer» B. Decrease in coefficient of friction | |
| 135. |
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 | |
| 136. |
In an interchangeable assembly, shafts of size 25.000 -0.010⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.020⁺⁰∙⁰³⁰, the maximum interference (in microns) in the assembly is |
| A. | 40 |
| B. | 30 |
| C. | 20 |
| D. | 10 |
| Answer» D. 10 | |
| 137. |
The addition of lead, sulphur and phosphorus to low carbon steels, help to |
| A. | Reduce built up edge |
| B. | Break up chips |
| C. | Improve machinability |
| D. | All of these |
| Answer» E. | |
| 138. |
In reaming process |
| A. | Metal removal rate is high |
| B. | High surface finish is obtained |
| C. | High form accuracy is obtained |
| D. | High dimensional accuracy is obtained |
| Answer» D. High dimensional accuracy is obtained | |
| 139. |
Internal gear cutting operation can be performed by |
| A. | Milling |
| B. | Shaping with rack cutter |
| C. | Shaping with pinion cutter |
| D. | Hobbing |
| Answer» D. Hobbing | |
| 140. |
Glazing in grinding wheels can be decreased by |
| A. | Using a harder wheel or by increasing the wheel speed |
| B. | Using a softer wheel or by decreasing the wheel speed |
| C. | Using a harder wheel or by decreasing the wheel speed |
| D. | Using a softer wheel or by increasing the wheel speed |
| Answer» C. Using a harder wheel or by decreasing the wheel speed | |
| 141. |
The method of grinding used to produce a straight or tapered surface on a workpiece, is |
| A. | Internal cylindrical grinding |
| B. | Form grinding |
| C. | External cylindrical grinding |
| D. | Surface grinding |
| Answer» D. Surface grinding | |
| 142. |
The tap used to cut threads in a blind hole is |
| A. | Taper tap |
| B. | Second tap |
| C. | Bottoming tap |
| D. | Any one of these |
| Answer» D. Any one of these | |
| 143. |
The tail-stock set over required to turn a taper on the entire length of a workpiece having diameters D and d is |
| A. | (D - d)/2L |
| B. | (D - d)/L |
| C. | (D - d)/2 |
| D. | D - d |
| Answer» D. D - d | |
| 144. |
When the tool moves parallel to the lathe axis, the movement is termed as |
| A. | Cross feed |
| B. | Angular feed |
| C. | Longitudinal feed |
| D. | Any one of these |
| Answer» D. Any one of these | |
| 145. |
In which of the following milling machine, the table can be tilted in a vertical plane by providing a swivel arrangement at the knee? |
| A. | Universal milling machine |
| B. | Plain milling machine |
| C. | Universal milling machine |
| D. | Hand milling machine |
| Answer» D. Hand milling machine | |
| 146. |
Climb milling is chosen while machining because |
| A. | The chip thickness increase gradually |
| B. | It enables the cutter to dig in and start the cut |
| C. | The specific power consumption is reduced |
| D. | Better surface finish can be obtained |
| Answer» C. The specific power consumption is reduced | |
| 147. |
Which of the following arc welding processes does not use consumable electrodes? |
| A. | GMAW |
| B. | GTAW |
| C. | Submerged Arc Welding |
| D. | None of these |
| Answer» C. Submerged Arc Welding | |
| 148. |
Cutting fluids are used to |
| A. | Cool the tool |
| B. | Improve surface finish |
| C. | Cool the workpiece |
| D. | All of these |
| Answer» E. | |
| 149. |
Soft materials can not be economically ground due to |
| A. | High temperature involved |
| B. | Frequent wheel clogging |
| C. | Rapid wheel wear |
| D. | Low work piece stiffness |
| Answer» C. Rapid wheel wear | |
| 150. |
An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is |
| A. | Cutting speed |
| B. | Feed rate |
| C. | Shear angle |
| D. | Tool geometry |
| Answer» D. Tool geometry | |