McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 101. |
Shell patterns are often used for |
| A. | pipe work |
| B. | bends |
| C. | drainage fittings |
| D. | all of the above |
| Answer» D. all of the above | |
| 102. |
In carbondioxide moulding the pressure of carbondioxide is around |
| B. | 500 kg/cm2 |
| C. | 1.5 kg/cm2 |
| D. | 15 kg/cm2 |
| E. | 150 kg/cm2 |
| Answer» C. 1.5 kg/cm2 | |
| 103. |
As compared to green sand in shell moulding cooling rate of cast metal is slow. Hence as compared to green sand castings, shell moulded castings will have |
| A. | larger grain size |
| E. | smaller grain size |
| Answer» A. larger grain size | |
| 104. |
Which of the following cast iron is resistant to attack by sea water? |
| B. | Low nickel cast iron |
| C. | Low sulphur cost iron |
| D. | Low chromium cast iron |
| E. | Low phosphorous cast iron |
| Answer» D. Low chromium cast iron | |
| 105. |
Shaving of die casted parts is the process of removal of |
| A. | sprue |
| B. | flash |
| C. | runner |
| D. | none of the above |
| Answer» B. flash | |
| 106. |
The lower portion of the moulding flasks are known as |
| A. | Cheek |
| C. | Cope |
| E. | Drag |
| Answer» E. Drag | |
| 107. |
Molybdenum upto 1.5% is added to cast iron to |
| A. | improve strength |
| B. | reduce wear resistance |
| C. | increase machinability |
| D. | all of the above |
| Answer» A. improve strength | |
| 108. |
A pit furnace can be used for the melting of |
| A. | cast iron |
| B. | brass |
| C. | aluminium |
| D. | all of the above |
| Answer» D. all of the above | |
| 109. |
Which of the following operations improve wear resistance and mechanical properties of castings? |
| A. | Shot peening |
| B. | Chilling |
| C. | Nitriding |
| D. | All of the above |
| Answer» D. All of the above | |
| 110. |
Metal moulds are used in all of the following EXCEPT |
| A. | Investment casting |
| B. | Permanent mould casting |
| D. | Centrifugal casting |
| E. | Die casting process |
| Answer» A. Investment casting | |
| 111. |
Which of the following is used to increase refractoriness of sand? |
| A. | Graphite |
| B. | Silica flour |
| C. | Iron free zirconium |
| D. | all of the above |
| Answer» D. all of the above | |
| 112. |
Alloy containing 70% nickel and 30% copper is known as |
| A. | hastalloy |
| C. | permalloy |
| D. | monel metal |
| E. | N-c alloy |
| Answer» D. monel metal | |
| 113. |
Generally for the melting of cast iron, electric furnaces are not used because |
| A. | cast iron is in the form of broken pieces |
| B. | It is expensive to use electricity for melting of cast iron |
| C. | the rate of heating required for melting cast iron connot be provided by electric furnaces |
| D. | cast iron requires higher temperature for heating |
| Answer» B. It is expensive to use electricity for melting of cast iron | |
| 114. |
Which variety of cast iron can be forged? |
| A. | Grey cast iron |
| B. | High silicon cast iron |
| C. | Wrought iron |
| D. | All of the above |
| Answer» C. Wrought iron | |
| 115. |
The solidification shrinkage of magnesium alloys is about |
| A. | 4 percent |
| B. | 1 percent |
| D. | 0.1 percent |
| E. | 14 percent |
| Answer» A. 4 percent | |
| 116. |
The drawback with metallic pattern is |
| A. | excessive weight |
| B. | expensive |
| C. | difficult to shape |
| D. | all of the above |
| Answer» D. all of the above | |
| 117. |
Which of the following is a screen? |
| A. | Shovel |
| C. | Slick |
| D. | Riddle |
| E. | Rearner |
| Answer» D. Riddle | |
| 118. |
The property of the foundry sand which enables it to adhere to the surface of other materials is termed |
| A. | Cohesiveness |
| B. | Adhesiveness |
| C. | Either of (A) or (B) |
| Answer» B. Adhesiveness | |
| 119. |
A cupola one metre in diameter and 4 metres in height will melt in one hour about |
| B. | 0.5 tonnes of iron |
| C. | 10 tonnes of iron |
| D. | 5 tonnes of iron |
| E. | 2 tonnes of iron |
| Answer» E. 2 tonnes of iron | |
| 120. |
Pure iron melts at 1500?C. Presence of carbon |
| A. | does not change the melting point |
| B. | reduces the melting point |
| D. | increases the melting point |
| Answer» B. reduces the melting point | |
| 121. |
For producing several similar parts from a single mould the moulding used is |
| A. | bench moulding |
| B. | floor moulding |
| C. | plate moulding |
| D. | none of the above |
| Answer» C. plate moulding | |
| 122. |
A blind riser can be located |
| A. | in cheek only |
| B. | in either cope or drag |
| C. | in drag |
| D. | in cope |
| Answer» B. in either cope or drag | |
| 123. |
Use of flux in melting of magnesium |
| A. | separates out impurities |
| B. | prevents burning of magnesium alloys |
| C. | facilitates production of sound cstings |
| D. | all of the above |
| Answer» D. all of the above | |
| 124. |
A blast furnace operates continuously for |
| A. | weeks together |
| B. | days together |
| D. | hours together |
| E. | months together |
| Answer» E. months together | |
| 125. |
When external features of the castings are important, which of the following method of casting is preferred? |
| B. | Die casting |
| C. | Slush casting |
| D. | Carbondioxide casting |
| E. | Dry sand casting |
| Answer» C. Slush casting | |
| 126. |
The disadvantage of hot blast cupola is |
| A. | low coke consumption |
| B. | reduced silicon loss |
| C. | reduced output silicon loss |
| D. | all of the above |
| Answer» D. all of the above | |
| 127. |
Addition of saw dust to moulding sand increases its |
| A. | gas permeability |
| B. | refractoriness |
| C. | cohesiveness |
| D. | all of the above |
| Answer» A. gas permeability | |
| 128. |
Swab is used for |
| A. | applying water to the mould around the edge of the pattern |
| B. | shaking pattern to facilitate its with drawl from the mould |
| C. | repairing and finishing of mould |
| D. | none of the above |
| Answer» A. applying water to the mould around the edge of the pattern | |
| 129. |
For annealing of aluminium it is heated to |
| A. | 625?C |
| B. | 325?C |
| D. | 525?C |
| E. | 425?C |
| Answer» B. 325?C | |
| 130. |
In case of consumable patterns |
| A. | labour charges are reduced |
| B. | core is not required |
| C. | moulds are unsplit |
| D. | all of the above |
| Answer» D. all of the above | |
| 131. |
The burnt on sand causes difficulty in |
| A. | machining of castings |
| B. | removal of castings from moulds |
| C. | separation of sand and castings after pouring |
| D. | all of the above |
| Answer» A. machining of castings | |
| 132. |
The melting unit is an integral part of |
| A. | the cold chamber diecastings machine |
| B. | the hot chamber die casting machine |
| C. | both (A) and (B) above |
| Answer» B. the hot chamber die casting machine | |
| 133. |
Refractories should have all the following properties EXCEPT |
| A. | Long life |
| B. | Heat insulation |
| D. | High electrical conductivity |
| E. | Minimum contraction and expansion due to temperature variations |
| Answer» D. High electrical conductivity | |
| 134. |
Heating of core is necessary while using which of the following core binder? |
| A. | Phenol formaldehyde resin |
| B. | Phenolic alcohols |
| C. | Furan-base binder |
| D. | All of the above |
| Answer» D. All of the above | |
| 135. |
Which of the following metals has the lowest melting point? |
| A. | Magnesium |
| B. | Aluminium |
| C. | Silver |
| E. | Brass |
| Answer» A. Magnesium | |
| 136. |
Which of the following statement about core is incorrect? |
| B. | core should be capable of collapsing after the molten metal has solidified around it |
| C. | core should produce maximum amount of gas when in contact with molten metal |
| D. | core should be capable of collapsing shortly after the molten metal has solidified around it |
| E. | core should be permeable to escape of core gases |
| Answer» C. core should produce maximum amount of gas when in contact with molten metal | |
| 137. |
Rammer used for moulding the sand in large mould known as |
| A. | Hand rammer |
| B. | Peen rammer |
| E. | Floor rammer |
| Answer» E. Floor rammer | |
| 138. |
All of the following operations on castings are carried out for surface appearance improvement EXCEPT |
| A. | Galvanising |
| B. | Chilling |
| D. | Electroplating |
| E. | Enamelling |
| Answer» B. Chilling | |
| 139. |
Wax patterns are used in |
| A. | non-ferrous castings |
| B. | investment casting process |
| C. | machine moulding process |
| D. | all of the above |
| Answer» B. investment casting process | |
| 140. |
In copper alloy foundry which of the following is used to prevent the molten metal from being oxidized? |
| A. | phophorous |
| B. | bone ash |
| C. | calcium carbonate |
| E. | charcoal |
| Answer» E. charcoal | |
| 141. |
While selecting wood for patterns, one should |
| A. | discard the rot |
| B. | discard the seasoned wood |
| C. | select the fresthy filled wood |
| E. | select the cross-grained woods |
| Answer» A. discard the rot | |
| 142. |
A spoke shave is a |
| A. | planing tool |
| B. | sawing tool |
| C. | boring tool |
| E. | layout tool |
| Answer» A. planing tool | |
| 143. |
Oil used for core sand is |
| A. | molasses |
| B. | linseed oil |
| C. | mineral oil |
| D. | any of the above |
| Answer» D. any of the above | |
| 144. |
The percentage of sulphur in pig iron is generally |
| A. | 0.8% to 0.9% |
| C. | 0.01% to 0.3% |
| D. | 0.3% to 0.55% |
| E. | 0.6% to 0.79% |
| Answer» C. 0.01% to 0.3% | |
| 145. |
Solidification time for riser should be |
| A. | less than that of the casting |
| D. | same as that for the casting |
| E. | more than that of the casting |
| Answer» E. more than that of the casting | |
| 146. |
Which of the following is very powerful carbide former in cast iron? |
| A. | Chromium |
| B. | Nickel |
| D. | Vanadium |
| E. | Silicon |
| Answer» D. Vanadium | |
| 147. |
Sweep patterns are used to prepare mould of |
| A. | symmetrical and regular shapes |
| B. | unsymmetrical and regular shapes |
| C. | unsymmetrical and irregular shapes |
| D. | none of the above |
| Answer» A. symmetrical and regular shapes | |
| 148. |
For aluminium alloys grain refinement can be achieved using |
| A. | titanium |
| B. | boron |
| C. | zirconium |
| D. | any of the above |
| Answer» D. any of the above | |
| 149. |
Pneumatic tools find application in foundries normally for |
| A. | fin removal |
| B. | surface finish |
| C. | filling of cavities |
| D. | none of the above |
| Answer» A. fin removal | |
| 150. |
Which parameter can be used for the measurement of melt in a foundry? |
| A. | Thermo couple pyrometer |
| B. | Optical pyrometer |
| C. | Radiation pyrometer |
| D. | none of the above |
| Answer» D. none of the above | |
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