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Manufacturing Processes II Mcqs

Q:

The gear hob is a formed tooth milling cutter with helical teeth.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: The gear hob is a formed tooth milling cutter with helical teeth arranged like the thread on a screw. These teeth are fluted to produce required cutting edges.

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122
Q:

5in (125 mm) capacity machine can generate gears upto_____ pitch diameter.

A) 5in B) 10in
C) 15in D) 20in
 
Answer & Explanation Answer: A) 5in

Explanation: The number signifies the maximum pitch diameter of a gear that can be produced by that machine. Therefore 5in capacity means the largest gear manufactured by that machine will have pitch diameter equal to 5in.

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172
Q:

Hobbing machines are characterised by _____

A) production rate B) largest module or PCD it can generate
C) accuracy of the machine D) size of the machine
 
Answer & Explanation Answer: B) largest module or PCD it can generate

Explanation: Hobbing machines are characterised by the largest module or pitch diameter it can generate as they can produce anything from tiny instrument gears to 10ft diameter marine gears.

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309
Q:

For helical gears, the angle between hob’s spindle axis and workpiece’s spindle axis must be _____ as the helix angle of the helical gear.

A) increased by the same amount B) increased by the half amount
C) decreased by the same amount D) decreased by the half amount
 
Answer & Explanation Answer: A) increased by the same amount

Explanation: For manufacturing the helical gear, one has to consider helix angle of the gear. While hobbing the helical gear, angle between hob spindle axis and workpiece spindle axis should be increased by an angle equal to helix angle of the gear.

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1679
Q:

For spur gear manufacturing, angle between the hob’s spindle axis and the workpiece’s spindle axis should be equal to____

A) (helix angle of the hob)/2 B) 2*(helix angle of the hob)
C) (helix angle of the hob) D) (helix angle of the hob)2
 
Answer & Explanation Answer: C) (helix angle of the hob)

Explanation: As hob has helical threads, it has to be oriented making some angle with the workpiece as per the requirement and then it is fed into the workpiece. For spur gears, that angle should be equal to the helix angle of the hob.

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1170
Q:

In the process of gear cutting by hobbing, the angle between the hob’s spindle axis and the workpiece’s spindle axis is fixed.

A) True B) False
 
Answer & Explanation Answer: B) False

Explanation: The angle between the hob’s spindle axis and the worpiece’s spindle axis varies depending upon the type of product being manufactured.

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138
Q:

Hobbing is a special type of which of the following?

A) Casting B) Grinding
C) Drilling D) Milling
 
Answer & Explanation Answer: D) Milling

Explanation: Hobbing is a special type of milling in which teeth are cut by a series of cuts made by a tool known as a hob.

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552
Q:

Hobbing process is also used for which of the following application?

A) Punching B) Metal bending
C) Rust removal D) Sprocket cutting
 
Answer & Explanation Answer: D) Sprocket cutting

Explanation: Hobbing is a machining process widely used for cutting gears, splines and sprockets. The tool used for cutting is called as a hob.

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