The casting defect misrun occurs when:

This question was previously asked in
NPCIL Stipendiary Trainee ME 2018
View all NPCIL Scientific Assistant Papers >
  1. Liquid metal is not properly poured into the down sprue
  2. Metal solidifies before filling the cavity
  3. Microporosity occurs in the casting
  4. Globules of metal become entrapped in the casting

Answer (Detailed Solution Below)

Option 2 : Metal solidifies before filling the cavity
Free
NPCIL Scientific Assistant Quantum Mechanics Test
10 Qs. 10 Marks 13 Mins

Detailed Solution

Download Solution PDF

Concept:

  • A casting defect is an irregularity in the metal casting process that is undesired.
  • Misrun is caused when the metal is unable to fill the mould cavity completely and thus leaves improperly filled cavities it occurs due to low pouring temperature, lack of fluidity.
  • A casting defect is an irregularity in the metal casting process that is undesired.
  • Classification of casting defects is given as:

Casting defects

Surface

Defect

Internal

Defect

Visible

Defects

Blow

Blowholes

Wash

Scar

Porosity

Rattail

Blister

Pinholes

Swell

Drop

Inclusions

Misrun

Scab

Dross

Cold shut

Penetration

 

Hot tear

Buckle

 

Shrinkage/Shift

Latest NPCIL Scientific Assistant Updates

Last updated on Mar 27, 2025

-> NPCIL Scientific Assistant Recruitment Notification 2025 is out! 

->The Nuclear Power Corporation of India Limited (NPCIL) has released the NPCIL Scientific Assistant Recruitment notification for 45 vacancies.

-> Candidates can apply online start applying from 12 March 2025 till 1 April 2025.

-> NPCIL Exam Date 2025 is yet to be announced, candidates can keep a check on the official website for latest updates.

-> Candidates with diploma in Civil/Mechanical/Electrical/Electronics with a minimum of 60% marks are eligible to apply. 

Hot Links: teen patti classic teen patti joy mod apk teen patti master game teen patti lotus teen patti master new version