IOCL Junior Operator Fitter MCQ || IOCL Junior Operator General Science Questions and Answers

• The primary function of a vice is holding workpieces.
• A vice is a tool used to securely hold an object while you work on it.
• It provides a stable and fixed position, allowing you to perform operations like sawing, filing, drilling, or assembling parts.
• They are essential for various tasks in woodworking, metalworking, and other crafts.

• The common name for a vice used in bench work is bench vice or Engineer’s vice.
• A bench vice is a mechanical tool designed to hold a workpiece in place while it is being worked on.
• It is an essential tool in any workshop or garage and is used to firmly hold a workpiece in place during cutting, drilling, filing, or any other operation that requires stability

• A bench vice is mostly used to hold things still while you file, saw, or make screw threads on them. It keeps your hands free to do the work.
• They provide a stable grip, allowing for precise control and hands-free operation.
• Other operations bench vices can be used for are gluing, sanding, and pounding

• The primary purpose of a hacksaw frame is to hold and guide the hacksaw blade.
• The frame provides tension and support to the blade, allowing for controlled and accurate cutting.

• Without a frame, the thin, flexible blade would buckle and be impossible to use effectively.
• The frame also provides a handle for the user to grip and apply force.

• The most accurate way to specify a hacksaw frame is by the type and maximum length of blade it can hold.
• The frame needs to be the correct size to properly tension and support the blade for effective cutting.
• Standard hacksaw blade lengths are 10 to 12 inches (250 to 300 mm), but blades can be as small as 6 inches (150 mm).

The types of hacksaw frames include:

1. Solid Frame:
   • Designed for a specific blade length (e.g., 300mm or 250mm).
   • Offers rigidity and simplicity.
   • Less versatile compared to adjustable frames.
2. Adjustable Frame (Flat Type):
   • Accommodates multiple standard blade lengths (e.g., 250mm and 300mm).
   • Uses strips and notches for adjustment.
   • Provides flexibility in blade selection.
3. Adjustable Frame (Tubular Type):
   • Most common type.
   • Made of steel tubes, adjustable using a screw.
   • Offers better grip, control, and versatility.

An adjustable hacksaw frame described as “tubular – 250-300mm or 8″-12″” indicates the adjustable blade length range it can accommodate.

• Adjustable: You can make the frame longer or shorter.
• 250-300mm or 8″-12″: This tells you the size of saw blades the frame can hold. It can hold blades that are between 8 inches and 12 inches long (or 250 to 300 millimeters).

The parts of a hacksaw blades include.

1. Back Edge: This is the non-cutting edge of the blade. It provides structural support and maintains the blade’s shape during cutting.
2. Sides: These are the flat surfaces of the blade that run parallel to the cutting edge. They provide a surface for the blade to slide against the material being cut.
3. Center Line: An imaginary line running through the middle of the blade’s width. This helps ensure accurate and straight cuts.
4. Pin Holes: These are the small holes at each end of the blade that fit onto the pins of the hacksaw frame, allowing the blade to be securely mounted.

• The primary use of an all-hard hacksaw blade is Cutting hard metals like tool steel.
• All-hard blades are made from high-speed steel hardened throughout, making them rigid and strong.
• This makes them best for cutting tough stuff like hardened steel.

• Flexible blades are more elastic and less likely to break, making them suitable for cutting curves.
• All-hard blades are rigid and better for straight cuts on hard materials