75 + Interview Questions in Core And Core Making in Casting-Forming-Welding I Page 2 InterviewSolution

51.	Core dryers are basically the flat surfaces used for supporting the cores in the moulding box.(a) True(b) FalseThis question was addressed to me in an interview for job.I'd like to ask this question from Core Application topic in portion Core and Core Making of Casting-Forming-Welding I
Answer» The correct ANSWER is (a) True To elaborate: In the moulding BOX, the cores should be prevented from sagging and breaking. So for supporting the cores, flat surfaces are required which are COMMONLY called as core dryers. Core dryers can be made as metal castings with thin sections in ORDER to absorb minimum heat. For large production of castings, many core dryers are required. Core dryer is shown in the below figure-

Discussion

52.	Silica gel is formed when sodium bicarbonate reacts with carbon monoxide.(a) True(b) FalseI had been asked this question during an interview.My query is from Types of Cores in division Core and Core Making of Casting-Forming-Welding I
Answer» The CORRECT ANSWER is (b) False Easy EXPLANATION: SILICA gel is formed along with sodium carbonate when sodium SILICATE reacts with carbon dioxide.

Discussion

53.	What does the following figure represent?(a) Half core box(b) Split core box(c) Gang core box(d) Loose piece core boxThe question was posed to me during an interview for a job.My question comes from Making the Cores in division Core and Core Making of Casting-Forming-Welding I
Answer» Right option is (a) Half core box The explanation: The following figure represents a half core box. This type of core box is MAINLY USED for the production of cores which are CYLINDRICAL in SHAPE.

Discussion

54.	Using what are core ovens heated?(a) Gases or oils(b) Infrared heating(c) Ultraviolet heating(d) Solar heatThe question was asked in an internship interview.My enquiry is from Baking the Cores in division Core and Core Making of Casting-Forming-Welding I
Answer» Right ANSWER is (a) GASES or oils The EXPLANATION is: Core ovens are heated in a well-defined temperature RANGE. They are heated USING gases and other oils.

Discussion

55.	It is not necessary for the chaplets to be of the same material as the material being casted in the mould.(a) True(b) FalseThis question was posed to me during an internship interview.The origin of the question is Core Application topic in portion Core and Core Making of Casting-Forming-Welding I
Answer» RIGHT option is (b) False For explanation I would SAY: In the moulding BOX, chaplets are mainly used for supporting the cores. Chaplets are more utilized when the long cores are used with the production of COMPLEX castings. It is very important and necessary for the chaplets to be of the same material as the metal being casted because the chaplets get MELTED and become the part of the casting during the pouring operation.

Discussion

56.	In dielectric core baker, several metallic plates are used for supporting the cores in the system.(a) True(b) FalseI have been asked this question by my school principal while I was bunking the class.The above asked question is from Dielectric Core Bakers topic in division Core and Core Making of Casting-Forming-Welding I
Answer» Right choice is (b) False Explanation: Dielectric core bakers are BASICALLY based on dielectric heating. The core SUPPORTING metallic plates cannot be used in this type of baker because they interrupt the potential distribution in the electrostatic field. To avoid this interruption or interference, cement bonded ASBESTOS plates can be used for supporting the cores instead of metallic plates.

Discussion

57.	In hot box process, core box is heated up to what temperature?(a) 220°F – 300°F(b) 250°F – 320°F(c) 350°F – 500°F(d) 420°F – 550°FThe question was asked in an interview for internship.My question is taken from Types of Cores in portion Core and Core Making of Casting-Forming-Welding I
Answer» Right choice is (c) 350°F – 500°F To explain: In the hot box process, core box is known to be made up of cast irons or STEELS or aluminium METAL. It is heated in between the TEMPERATURE RANGE of 350°F – 500°F.

Discussion

58.	Why the air already present inside the corebox is necessary to be evacuated before pressurised air is blown into it?(a) The air has comparatively low pressure hence, distortion occurs(b) Hot tears will occur on the surface(c) It will cause poor sand distribution and poor compaction(d) Nothing will happen as the pressure of incoming air neutralises inside air pressureI got this question in semester exam.I want to ask this question from Finishing of Cores topic in section Core and Core Making of Casting-Forming-Welding I
Answer» Correct choice is (c) It will CAUSE poor sand DISTRIBUTION and poor compaction For explanation I would say: The air inside the corebox does not GET ENOUGH TIME to escape hence sand distribution and compaction is poor.

Discussion

59.	How are core manufactured in casting?(a) Cores are manufactured from a pattern in the same way as of mold(b) Cores are manufactured by machining process(c) Cores are manufactured by traditional methods(d) Cores are not manufactured, they are found naturallyThe question was posed to me during an interview for a job.My doubt stems from Finishing of Cores topic in division Core and Core Making of Casting-Forming-Welding I
Answer» Right CHOICE is (a) CORES are manufactured from a pattern in the same WAY as of mold Easiest EXPLANATION: The manufacturing of cores is SIMILAR to mold making and ramming.

Discussion

60.	Cores are baked up to what temperature?(a) 600°F(b) 650°F(c) 700°F(d) 750°FThe question was asked in a national level competition.Asked question is from Baking the Cores topic in division Core and Core Making of Casting-Forming-Welding I
Answer» Correct CHOICE is (b) 650°F The best I can explain: Before the beginning of the process, the CORES need to be taken to a decently GOOD amount of temperature by preheating them. While baking the cores, the cores are taken up to a temperature as high as 650°F.

Discussion

61.	Cylindrical cores are made using Dump core boxes.(a) True(b) FalseI got this question in an interview.Enquiry is from Making the Cores topic in chapter Core and Core Making of Casting-Forming-Welding I
Answer» Correct answer is (b) False The explanation is: Dump CORE boxes are HELPFUL in MAKING rectangular or square cores. CYLINDRICAL cores are made using half core boxes.

Discussion

62.	What does the following figure represent?(a) Sand slinger(b) Core extrusion machine(c) Pattern and core prints(d) Core blowing machineThe question was asked in unit test.This is a very interesting question from Making the Cores topic in section Core and Core Making of Casting-Forming-Welding I
Answer» The correct choice is (c) PATTERN and core prints To EXPLAIN: The following FIGURE REPRESENTS pattern and core prints. These core prints make up core SEATS when they are put into the sand for making mold.

Discussion

63.	A permeability of a core should be _________(a) Low(b) Moderate(c) High(d) Has no effect on castingThe question was asked in exam.My question is taken from Different Functions of Core topic in portion Core and Core Making of Casting-Forming-Welding I
Answer» Right choice is (c) High To explain I would say: The permeability of the material should be high so as to EASE the flow of fluids through it during solidification, MAY work as gas exchanger or water ABSORBER.

Discussion

64.	Which of the following is a function of a core in casting?(a) Interior cavitational passages in a casting(b) To shape an external part of a more intricate casting(c) To strengthen and improve inner and outer surface of the mold(d) All of the mentionedThe question was asked in a national level competition.This key question is from Different Functions of Core in section Core and Core Making of Casting-Forming-Welding I
Answer» Correct choice is (d) All of the mentioned The EXPLANATION is: A CORE has VERSATILITY of its functions, all the LISTED functions a core can perform. Moreover, a core has more functions as well.

Discussion

65.	Which of the following is not a function of a core?(a) It is used to form internal cavities(b) It is used to form a part of green sand mould(c) It is used as a part of gating system(d) It is used as a part of furnaceI have been asked this question by my college director while I was bunking the class.I'd like to ask this question from Different Functions of Core topic in chapter Core and Core Making of Casting-Forming-Welding I
Answer» Correct option is (d) It is USED as a part of furnace To explain: All of the above functions are that of a core except that the core is never a part of the furnace. SOMEHOW it may be used to a path to enhance the flow of molten metal.

Discussion

66.	Cores are generally made of relatively low strength for better utilization in the production of castings.(a) True(b) FalseThe question was asked during a job interview.Origin of the question is Core Application in chapter Core and Core Making of Casting-Forming-Welding I
Answer» Right option is (a) True To EXPLAIN I WOULD SAY: In general, cores are made of two types which are green sand cores and dry sand cores, and both types of cores are made of relatively low strength than that of mould. This is basically done for easy REMOVAL of cores after solidification of castings so that the cores are easily break off and removed from the CASTING part.

Discussion

67.	Name the material in place of the question mark?(a) Mold cavity(b) Core seat(c) Chaplet(d) Molding sandI got this question in a national level competition.My doubt stems from Setting the Cores topic in section Core and Core Making of Casting-Forming-Welding I
Answer» The CORRECT answer is (d) Molding sand The explanation: The MATERIAL which is in the place of the question mark is molding sand. The molding sand is an IMPORTANT component as, on this the entire APPARATUS is KEPT.

Discussion

68.	Which of the following is not a core machine?(a) Jolt machine(b) Core blower(c) Sand slinger(d) Mill setterI had been asked this question in class test.My enquiry is from Making the Cores in section Core and Core Making of Casting-Forming-Welding I
Answer» The correct CHOICE is (d) Mill setter For explanation I would say: AMONG the FOLLOWING, mill setter is not any TYPE of a core machine, while the other three are few of the types of core machine.

Discussion

69.	What is positioned between mold and core surface?(a) Chaplets(b) Molding surface(c) Core seat(d) Mold cavityI got this question in homework.My doubt is from Setting the Cores in chapter Core and Core Making of Casting-Forming-Welding I
Answer» The correct answer is (a) Chaplets The best explanation: Chaplets are a TYPE of metal shape which are positioned between mold and core SURFACE. These chaplets first MELT and then they become a part of the CASTINGS.

Discussion

70.	Name the material in place of the question mark?(a) Mold cavity(b) Core seat(c) Chaplet(d) Molding sandI have been asked this question in final exam.My doubt is from Setting the Cores topic in portion Core and Core Making of Casting-Forming-Welding I
Answer» CORRECT answer is (B) Core seat The explanation is: The apparatus in place of the QUESTION MARK is a core seat. The core seat plays a vital role in this operation. It helps in holding the core FIRMLY.

Discussion

71.	A sand slinger works at a high speed.(a) True(b) FalseI got this question in my homework.Query is from Making the Cores in portion Core and Core Making of Casting-Forming-Welding I
Answer» Right answer is (a) True Explanation: A SAND slinger uses a high speed ROTATING IMPELLER which is used for throwing sand in the core BOX.

Discussion

72.	For small cores mass production, dielectric core bakers can be preferred over continuous type ovens used for baking cores.(a) True(b) FalseI had been asked this question during an interview.Question is taken from Dielectric Core Bakers in chapter Core and Core Making of Casting-Forming-Welding I
Answer» Correct answer is (b) False To elaborate: Dielectric core BAKERS are FASTER in operating the system but cannot be preferred over continuous type OVENS for small cores mass production. Continuous type ovens are MAINLY preferred for mass production. In this baking system, core carrying conveyors are used which continuously MOVES through the oven.

Discussion

73.	For removing cores from the castings, the hydraulic cleaning method is much safer than the method of caustic bath.(a) True(b) FalseI got this question during a job interview.Origin of the question is Core Application topic in chapter Core and Core Making of Casting-Forming-Welding I
Answer» The correct CHOICE is (a) True For explanation I would say: In the caustic bath or mechanical agitation, some CHEMICALS are used which are generally associated with the high level of health, SAFETY and environmental risks. So to AVOID such types of risks and to perform safer, hydraulic cleaning method is used in which a high pressure water jet is used which ERODES the core particles from the casting part.

Discussion

74.	Why should the finishing of the core be made good enough?(a) The intricate shapes made are difficult for machine finishing(b) The size of the cavities and contours must be accurate to enable perfect assemblies(c) It reduces machining cost and time invested for that(d) All of the mentionedI have been asked this question during an interview.My question is based upon Finishing of Cores topic in section Core and Core Making of Casting-Forming-Welding I
Answer» The CORRECT option is (d) All of the mentioned For explanation I WOULD say: The cores are used where machining cost or time is the foundation or is difficult to ACHIEVE and hence finishing is DONE on the CORE itself.

Discussion

75.	What does the following figure represent?(a) Core plate(b) Core drier(c) Core oxidizer(d) Core rackThis question was posed to me during an interview.The doubt is from Baking the Cores topic in chapter Core and Core Making of Casting-Forming-Welding I
Answer» Correct answer is (b) CORE drier To explain I would SAY: The given figure is a core drier. It is a WOODEN PIECE which is having a semi circular groove used for supporting a round core.

Discussion

Explore topic-wise InterviewSolutions in .

Core dryers are basically the flat surfaces used for supporting the cores in the moulding box.(a) True(b) FalseThis question was addressed to me in an interview for job.I'd like to ask this question from Core Application topic in portion Core and Core Making of Casting-Forming-Welding I

Silica gel is formed when sodium bicarbonate reacts with carbon monoxide.(a) True(b) FalseI had been asked this question during an interview.My query is from Types of Cores in division Core and Core Making of Casting-Forming-Welding I

What does the following figure represent?(a) Half core box(b) Split core box(c) Gang core box(d) Loose piece core boxThe question was posed to me during an interview for a job.My question comes from Making the Cores in division Core and Core Making of Casting-Forming-Welding I

Using what are core ovens heated?(a) Gases or oils(b) Infrared heating(c) Ultraviolet heating(d) Solar heatThe question was asked in an internship interview.My enquiry is from Baking the Cores in division Core and Core Making of Casting-Forming-Welding I

It is not necessary for the chaplets to be of the same material as the material being casted in the mould.(a) True(b) FalseThis question was posed to me during an internship interview.The origin of the question is Core Application topic in portion Core and Core Making of Casting-Forming-Welding I

Cores are baked up to what temperature?(a) 600°F(b) 650°F(c) 700°F(d) 750°FThe question was asked in a national level competition.Asked question is from Baking the Cores topic in division Core and Core Making of Casting-Forming-Welding I

Cylindrical cores are made using Dump core boxes.(a) True(b) FalseI got this question in an interview.Enquiry is from Making the Cores topic in chapter Core and Core Making of Casting-Forming-Welding I

What does the following figure represent?(a) Sand slinger(b) Core extrusion machine(c) Pattern and core prints(d) Core blowing machineThe question was asked in unit test.This is a very interesting question from Making the Cores topic in section Core and Core Making of Casting-Forming-Welding I

A permeability of a core should be _________(a) Low(b) Moderate(c) High(d) Has no effect on castingThe question was asked in exam.My question is taken from Different Functions of Core topic in portion Core and Core Making of Casting-Forming-Welding I

Cores are generally made of relatively low strength for better utilization in the production of castings.(a) True(b) FalseThe question was asked during a job interview.Origin of the question is Core Application in chapter Core and Core Making of Casting-Forming-Welding I

Name the material in place of the question mark?(a) Mold cavity(b) Core seat(c) Chaplet(d) Molding sandI got this question in a national level competition.My doubt stems from Setting the Cores topic in section Core and Core Making of Casting-Forming-Welding I

Which of the following is not a core machine?(a) Jolt machine(b) Core blower(c) Sand slinger(d) Mill setterI had been asked this question in class test.My enquiry is from Making the Cores in section Core and Core Making of Casting-Forming-Welding I

What is positioned between mold and core surface?(a) Chaplets(b) Molding surface(c) Core seat(d) Mold cavityI got this question in homework.My doubt is from Setting the Cores in chapter Core and Core Making of Casting-Forming-Welding I

Name the material in place of the question mark?(a) Mold cavity(b) Core seat(c) Chaplet(d) Molding sandI have been asked this question in final exam.My doubt is from Setting the Cores topic in portion Core and Core Making of Casting-Forming-Welding I

A sand slinger works at a high speed.(a) True(b) FalseI got this question in my homework.Query is from Making the Cores in portion Core and Core Making of Casting-Forming-Welding I

For small cores mass production, dielectric core bakers can be preferred over continuous type ovens used for baking cores.(a) True(b) FalseI had been asked this question during an interview.Question is taken from Dielectric Core Bakers in chapter Core and Core Making of Casting-Forming-Welding I

For removing cores from the castings, the hydraulic cleaning method is much safer than the method of caustic bath.(a) True(b) FalseI got this question during a job interview.Origin of the question is Core Application topic in chapter Core and Core Making of Casting-Forming-Welding I

What does the following figure represent?(a) Core plate(b) Core drier(c) Core oxidizer(d) Core rackThis question was posed to me during an interview.The doubt is from Baking the Cores topic in chapter Core and Core Making of Casting-Forming-Welding I