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Hot Working Processes Quiz

Total questions: 102

Worksheet time: 54mins

Name
Class
Date
1.

Hot working is a metal forming process carried out:

a)

Below recrystallization temperature

b)

At room temperature

c)

Above recrystallization temperature

d)

At freezing temperature

2.

One of the main advantages of hot working is:

a)

Produces rough surface

b)

Reduces ductility

c)

Improves grain structure and mechanical properties

d)

Reduces temperature of metal

3.

Which of the following is not an advantage of hot working?

a)

No residual stress

b)

Low power requirement

c)

Improved ductility

d)

Grain refinement

4.

In hot working, the metal is:

a)

Strained above melting point

b)

Crystallized during deformation

c)

Hardened by cold working

d)

Always cast first

5.

Rolling is a type of:

a)

Joining process

b)

Heat treatment

c)

Hot working process

d)

Casting process

6.

In forging, the operation where metal is shaped by repeated blows of hammer is called:

a)

Drop forging

b)

Press forging

c)

Hammer or Smith forging

d)

Upset forging

7.

Drop forging is characterized by:

a)

Constant load application

b)

Rolling between dies

c)

Sudden impact by falling hammer

d)

Heating and quenching

8.

Upset forging increases the:

a)

Length of workpiece

b)

Width of workpiece

c)

Diameter or cross-section by reducing length

d)

Internal porosity

9.

Press forging differs from drop forging because it:

a)

Uses high-speed hammering

b)

Applies gradual pressure

c)

Is done cold

d)

Requires no dies

10.

Which type of forging is best suited for high-volume, high-precision parts?

a)

Hand forging

b)

Drop forging

c)

Upset forging

d)

Press forging

11.

Roll forging is a combination of:

a)

Extrusion and casting

b)

Rolling and forging

c)

Drawing and piercing

d)

Machining and pressing

12.

In smith forging, what tool is commonly used to apply force?

a)

Mechanical press

b)

Rolling mill

c)

Sledge hammer

d)

Drill

13.

The process where a heated bar is increased in diameter by applying axial pressure is called:

a)

Roll forging

b)

Upset forging

c)

Coining

d)

Smith forging

14.

Which of the following forging methods is not suitable for producing thin, intricate parts?

a)

Drop forging

b)

Press forging

c)

Hammer forging

d)

Open die forging

15.

Which forging method uses dies with pre-cut impressions?

a)

Open die forging

b)

Drop forging

c)

Hand forging

d)

Rotary forging

16.

A benefit of press forging over hammer forging is:

a)

Less tooling cost

b)

More metal wastage

c)

Better control and accuracy

d)

Faster operation

17.

Roll forging is ideal for manufacturing:

a)

Flat plates

b)

Hollow pipes

c)

Tapered shafts and leaf springs

d)

Bearings

18.

In hot working, the flow stress of the material is:

a)

Constant

b)

Low

c)

High

d)

Zero

19.

Forging improves mechanical properties by:

a)

Increasing porosity

b)

Refining the grain structure

c)

Adding impurities

d)

Surface oxidation

20.

The temperature range for hot working steel is typically:

a)

100∞C – 300∞C

b)

500∞C – 700∞C

c)

900∞C – 1300∞C

d)

1400∞C – 1700∞C

21.

In drop forging, the force is applied using:

a)

Hydraulic press

b)

Pneumatic hammer

c)

Screw press

d)

Gravity hammer

22.

Hot working is preferred over cold working when:

a)

High surface finish is needed

b)

High strength and hardness are required

c)

Large plastic deformation is needed

d)

No heating is possible

23.

In hot working, internal cracks are:

a)

Enlarged

b)

Unchanged

c)

Welded or healed

d)

Hardened

24.

Roll forging is used to produce:

a)

Threads

b)

Spherical balls

c)

Tapered leaf springs and axles

d)

Pipes

25.

What is the main disadvantage of hot working?

a)

Poor surface finish

b)

Internal stress formation

c)

Hardening of the surface

d)

Crack development

26.

In open-die forging, the workpiece is:

a)

Fully enclosed in dies

b)

Forged in open atmosphere with simple dies

c)

Machined to final shape

d)

Welded and then shaped

27.

Which forging process gives high dimensional accuracy?

a)

Hammer forging

b)

Open-die forging

c)

Press forging

d)

Drop forging

28.

In which forging process does the material flow in three dimensions?

a)

Rolling

b)

Smith forging

c)

Upset forging

d)

Press forging

29.

During hot forging, which of the following properties decreases?

a)

Ductility

b)

Strength

c)

Hardness

d)

Grain size

30.

Cold forging is not suitable for:

a)

Soft metals

b)

High-precision parts

c)

Hard metals

d)

Small parts

31.

Which operation is generally performed after forging to relieve stresses?

a)

Hardening

b)

Normalizing

c)

Surface finishing

d)

Coating

32.

The energy requirement for hot working is:

a)

Less than cold working

b)

More than cold working

c)

Equal to cold working

d)

Same for all metals

33.

In hammer forging, the number of blows required depends on:

a)

Shape of die only

b)

Skill of the worker

c)

Type of material and size of workpiece

d)

Lubrication

34.

Flash formation is intentionally allowed in:

a)

Open-die forging

b)

Cold forging

c)

Closed-die forging

d)

Upset forging

35.

Which of the following processes is suitable for bulk production?

a)

Hand forging

b)

Drop forging

c)

Open-die forging

d)

Die-less forging

36.

In which process is a billet passed through rotating dies?

a)

Drop forging

b)

Roll forging

c)

Press forging

d)

Upset forging

37.

What is the main purpose of lubrication in hot forging?

a)

Improve cooling

b)

Reduce die wear and friction

c)

Reduce hardness

d)

Increase porosity

38.

In press forging, the flow of metal is:

a)

Uncontrolled

b)

Sudden and random

c)

Uniform and controlled

d)

Directionless

39.

Which forging technique uses horizontal movement of dies?

a)

Roll forging

b)

Press forging

c)

Open-die forging

d)

Coining

40.

What is the main reason for reheating during long forging operations?

a)

Reduce time

b)

Improve hardness

c)

Maintain working temperature

d)

Control grain growth

41.

The most suitable forging process for large shafts is:

a)

Open-die forging

b)

Press forging

c)

Drop forging

d)

Upset forging

42.

The forging load is highest in:

a)

Open-die forging

b)

Cold forging

c)

Hot forging

d)

Drop forging

43.

Which of the following is not a hot working operation?

a)

Extrusion

b)

Rolling

c)

Drawing

d)

Shot peening

44.

Which of the following forging methods is used for mass production of bolts and rivets?

a)

Hand forging

b)

Drop forging

c)

Upset forging

d)

Press forging

45.

The rate of strain in hammer forging is:

a)

Very slow

b)

Uniform

c)

High and instantaneous

d)

Negligible

46.

What is the main cause of forging defects?

a)

Improper machining

b)

Incorrect die lubrication

c)

Poor forging temperature control

d)

Weak material

47.

In which forging operation is maximum deformation achieved in one blow?

a)

Hand forging

b)

Press forging

c)

Drop forging

d)

Roll forging

48.

Which forging process requires less maintenance and has a quieter operation?

a)

Hammer forging

b)

Drop forging

c)

Press forging

d)

Upset forging

49.

Why is grain flow important in forging?

a)

To increase surface finish

b)

To reduce weight

c)

To improve strength and fatigue resistance

d)

To make the shape symmetrical

50.

Which of the following metals is best suited for cold forging?

a)

Cast iron

b)

Mild steel

c)

Brass

d)

Tool steel

51.

Roll forging is not suitable for producing:

4 lines
52.

best suited for cold forging?

a)

Cast iron

b)

Mild steel

c)

Brass

d)

Tool steel

53.

Roll forging is not suitable for producing:

a)

Axles

b)

Rods

c)

Flat plates

d)

Tapered leaf springs

54.

The dies used in forging are usually made from:

a)

Mild steel

b)

Cast iron

c)

High carbon steel

d)

Tool steel

55.

An example of a hot rolling product is:

a)

Screw

b)

TMT bar

c)

Bolt

d)

Gear

56.

Which defect occurs due to incomplete die filling in closed-die forging?

a)

Cold shut

b)

Scale pits

c)

Laps

d)

Underfill

57.

What is forging tolerance?

a)

Allowable variation in temperature

b)

Allowable error in shape or size

c)

Variation in surface finish

d)

Allowable porosity

58.

What is the main reason for using lubricants during forging?

a)

Increase heat

b)

Avoid oxidation

c)

Reduce friction and die wear

d)

Improve grain flow

59.

Press forging is mostly used where:

a)

High surface finish is needed

b)

Dimensional accuracy is not important

c)

Continuous high pressure is required

d)

Drop hammer is not available

60.

Which of the following is a forging defect?

a)

Hot tear

b)

Blowhole

c)

Lap

d)

Sink mark

61.

Forging operation where metal is squeezed in a closed cavity is called:

a)

Open-die forging

b)

Drop forging

c)

Coining

d)

Hot rolling

62.

Which forging method is best suited for making complex shapes with high accuracy?

a)

Drop forging

b)

Open-die forging

c)

Cold forging

d)

Roll forging

63.

The main difference between hot forging and cold forging is:

a)

Type of dies used

b)

Rate of production

c)

Temperature at which metal is deformed

d)

Weight of the component

64.

What happens to grain structure during hot forging?

a)

Grain size becomes larger

b)

Grain structure remains the same

c)

New grains are formed (recrystallization)

d)

Cracks develop along grain boundaries

65.

Which of the following processes helps eliminate porosity in the metal?

a)

Casting

b)

Welding

c)

Hot forging

d)

Machining

66.

In which process is the stock (metal bar) upset or shortened by increasing its diameter?

a)

Drawing

b)

Upset forging

c)

Rolling

d)

Heading

67.

Which forging method is best suited for axial symmetrical components?

a)

Open-die forging

b)

Roll forging

c)

Upset forging

d)

Drop forging

68.

What does 'flash' mean in forging?

a)

Cooling rate of metal

b)

Surface finish defect

c)

Excess metal squeezed out of die

d)

Heat produced in forging

69.

A common defect in forging due to improper die alignment is:

a)

Cold shut

b)

Misalignment

c)

Crack

d)

Flash

70.

Which of the following operations can be performed by mechanical press forging?

a)

Only hot forging

b)

Only cold forging

c)

Both hot and cold forging

d)

Only extrusion

71.

Which metal is most difficult to forge due to low ductility?

a)

Copper

b)

Mild steel

c)

Cast iron

d)

Aluminium

72.

What is the effect of hot forging on residual stresses?

a)

Increases them

b)

Has no effect

c)

Eliminates or relieves them

d)

Makes them worse

73.

Coining is a type of:

a)

Rolling operation

b)

Hammer forging

c)

Precision forging in closed dies

d)

Extrusion

74.

Which of the following is not an advantage of forging?

a)

Superior grain flow

b)

Improved mechanical properties

c)

Complex internal shapes

d)

Reduced porosity

75.

Cold forging is generally carried out:

a)

At room temperature

b)

At 200∞C

c)

Just below recrystallization

d)

Just above melting point

76.

During hot forging, which of the following forms on the surface?

a)

Scale

b)

Rust

c)

Flash cracks

d)

Blowholes

77.

Which of the following is a closed-die forging process?

a)

Upset forging

b)

Hand forging

c)

Smith forging

d)

Open-die forging

78.

What does the term 'draft' mean in forging dies?

a)

Slope provided for easy removal of forged part

b)

Cooling system

c)

Depth of die cavity

d)

Clearance between dies

79.

Which equipment is not commonly used in forging?

a)

Power hammer

b)

Hydraulic press

c)

Milling machine

d)

Drop hammer

80.

Which process requires least flash loss?

a)

Drop forging

b)

Open-die forging

c)

Closed-die forging

d)

Press forging

81.

Forging improves toughness by:

a)

Changing chemical composition

b)

Aligning grain structure with shape

c)

Rapid quenching

d)

Increasing porosity

82.

The reduction ratio in forging refers to:

a)

Die wear rate

b)

Tool pressure

c)

Ratio of initial to final cross-sectional area

d)

Temperature drop

83.

The primary purpose of forging is to:

a)

Weld two parts together

b)

Reduce machining time

c)

Improve the mechanical properties by refining grain flow

d)

Improve casting shape

84.

Which of the following is not a type of forging hammer?

a)

Power hammer

b)

Steam hammer

c)

Screw hammer

d)

Milling hammer

85.

In forging, burring is a defect caused by:

a)

Excessive heating

b)

Misalignment of die

c)

Die overfill and improper trimming

d)

Undersized billet

86.

Which hot working process uses two rotating rolls to reduce thickness?

a)

Drop forging

b)

Rolling

c)

Upset forging

d)

Coining

87.

In which forging operation is impact energy used?

a)

Press forging

b)

Drop forging

c)

Roll forging

d)

Rotary forging

88.

In hot forging, the flow stress is generally:

a)

Higher than cold forging

b)

Zero

c)

Lower than cold forging

d)

Irregular

89.

A typical hot working temperature for aluminum alloys is:

a)

100–200∞C

b)

300–400∞C

c)

450–500∞C

d)

600–700∞C

90.

What is the purpose of draft angle in die design?

a)

Better cooling

b)

Increase material strength

c)

Easy removal of forged component

d)

Create tighter fit

91.

A forging defect that occurs due to sharp corners in the die is called:

a)

Cold shut

b)

Scale pit

c)

Blowhole

d)

Mismatch

92.

In press forging, the deformation of the material occurs:

a)

Slowly and uniformly

b)

Suddenly with impact

c)

By rolling

d)

At room temperature

93.

In smith forging, which tool is used to cut hot metal?

a)

Fullering tool

b)

Flatter

c)

Chisel

d)

Punch

94.

Which forging process gives the best grain flow for load-bearing parts?

a)

Casting

b)

Drop forging

c)

Open-die forging

d)

Roll forging

95.

A forging operation that increases the length while reducing cross-sectional area is called:

a)

Heading

b)

Drawing out

c)

Upsetting

d)

Coining

96.

Which of the following is not a forging machine?

a)

Screw press

b)

Hydraulic press

c)

Lathe

d)

Drop hammer

97.

Which type of forging is used when very high accuracy and fine detail are required?

a)

Open-die forging

b)

Upset forging

c)

Coining

d)

Smith forging

98.

Flashless forging is also known as:

a)

Closed-die forging

b)

Open-die forging

c)

Precision forging

d)

Coining

99.

In rolling, the metal is:

a)

Pressed in a mold

b)

Deformed using shear

c)

Passed between two rollers

d)

Forged with a hammer

100.

Which property is enhanced due to hot working?

a)

Hardness

b)

Porosity

c)

Ductility

d)

Brittleness

101.

The upsetting operation is performed mostly on:

a)

Gears

b)

Pipes

c)

Rods for bolts, rivets

d)

Bearings

102.

In forging terminology, 'billet' refers to:

a)

Final forged product

b)

Scrap metal

c)

Raw metal bar or stock

d)

Die impression

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