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PIPE SET 16

Total questions: 100

Worksheet time: 50mins

Name
Class
Date
1.

Which is the primary function of heat exchangers in industrial plants?

a)

Transfer heat between two fluids

b)

Generate electricity

c)

Store heat permanently

d)

Increase fluid pressure

2.

Which law governs heat transfer in heat exchangers?

a)

Fourier's law

b)

Newton's law of cooling

c)

Stefan–Boltzmann law

d)

Pascal's law

3.

Which is the general heat exchanger design equation?

a)

Q=UAΔTQ = U A \Delta T

b)

Q=mCpΔTQ = m C_p \Delta T

c)

Q=kA (ΔT/L)Q = k A\,(\Delta T/L)

d)

Q=σ ε T4Q = \sigma \, \varepsilon \, T^4

4.

Which parameter is represented by "U" in the design equation?

a)

Overall heat transfer coefficient

b)

Internal energy

c)

Flow velocity

d)

Fouling resistance

5.

Which heat exchanger type has concentric tubes, one fluid inside and one outside?

a)

Plate heat exchanger

b)

Shell-and-tube heat exchanger

c)

Double-pipe heat exchanger

d)

Air-cooled heat exchanger

6.

Which type of heat exchanger is most widely used in power plants?

a)

Plate

b)

Spiral

c)

Double-pipe

d)

Shell-and-tube

7.

Which type of heat exchanger has high compactness and uses thin plates?

a)

Shell-and-tube

b)

Double-pipe

c)

Plate heat exchanger

d)

Air-cooled

8.

Which type of flow arrangement gives the highest thermal effectiveness?

a)

Parallel flow

b)

Counterflow

c)

Crossflow

d)

Mixed flow

9.

Which formula defines log-mean temperature difference (LMTD)?

a)

ΔTm=(ΔT1+ΔT2)/2\Delta T_m = (\Delta T_1 + \Delta T_2)/2

b)

ΔTm=Q/(m Cp)\Delta T_m = Q/(m \, C_p)

c)

ΔTm=(ΔT1−ΔT2)/ln⁡(ΔT1/ΔT2)\Delta T_m = (\Delta T_1 - \Delta T_2)/\ln(\Delta T_1/\Delta T_2)

d)

ΔTm=ΔT×Cp\Delta T_m = \Delta T \times C_p

10.

Which dimensionless number represents heat exchanger effectiveness?

a)

Reynolds number

b)

Prandtl number

c)

NTU (Number of Transfer Units)

d)

Nusselt number

11.

Which relation links heat exchanger effectiveness and NTU?

a)

ε=f(NTU, Cr)\varepsilon = f(\mathrm{NTU}, \, C_r)

b)

ε=NTU×Cr\varepsilon = \mathrm{NTU} \times C_r

c)

ε=Nu×Re\varepsilon = \mathrm{Nu} \times \mathrm{Re}

d)

ε=ΔT×Cp\varepsilon = \Delta T \times C_p

12.

Which factor reduces overall heat transfer coefficient in exchangers?

a)

Higher fluid velocity

b)

Fouling resistance

c)

Turbulent flow

d)

Counterflow arrangement

13.

Which component in shell-and-tube exchangers directs shell-side flow?

a)

Tubesheets

b)

End covers

c)

Baffles

d)

Nozzles

14.

Which type of baffles are used to support tubes and improve turbulence?

a)

Straight baffles

b)

Spiral baffles

c)

Segmental baffles

d)

Rod baffles

15.

Which code provides standards for shell-and-tube heat exchangers?

a)

NFPA 30

b)

API 610

c)

ASME Section IX

d)

TEMA

16.

Which material is commonly used for heat exchanger tubes in seawater service?

a)

Carbon steel

b)

Aluminum

c)

Cast iron

d)

Admiralty brass

17.

Which type of condenser mixes cooling water directly with steam?

a)

Evaporative condenser

b)

Jet condenser

c)

Surface condenser

d)

Air-cooled condenser

18.

Which type of condenser separates steam and cooling water with tubes?

a)

Jet condenser

b)

Spray condenser

c)

Surface condenser

d)

Contact condenser

19.

Which type of evaporator is widely used in sugar industries?

a)

Rising film evaporator

b)

Falling film evaporator

c)

Multiple-effect evaporator

d)

Forced circulation evaporator

20.

Which device increases efficiency of evaporators?

a)

Single effect only

b)

Using large clearance

c)

Reducing steam pressure

d)

Multiple effects with vapor reuse

21.

Which cooling equipment rejects heat using ambient air with fins?

a)

Shell-and-tube exchanger

b)

Plate heat exchanger

c)

Air-cooled heat exchanger

d)

Spray pond

22.

Which arrangement of flow has both fluids entering at same end?

a)

Counterflow

b)

Mixed flow

c)

Parallel flow

d)

Crossflow

23.

Which flow arrangement provides uniform wall temperature difference?

a)

Crossflow

b)

Counterflow

c)

Parallel flow

d)

Random flow

24.

Which parameter is minimized by increasing turbulence in exchangers?

a)

Flow velocity

b)

Fouling

c)

Heat transfer coefficient

d)

Pressure drop

25.

Which heat exchanger type is best for compact, high-efficiency service?

a)

Shell-and-tube

b)

Double-pipe

c)

Plate heat exchanger

d)

Air-cooled exchanger

26.

Which factor limits heat exchanger surface area increase?

a)

Fluid velocity

b)

Shell diameter

c)

Tube diameter

d)

Pressure drop considerations

27.

Which unit is used for overall heat transfer coefficient (U)?

a)

W/m^2·K

b)

W/m·K

c)

W/K

d)

W/m^3·K

28.

Which is the main advantage of multiple-effect evaporators?

a)

Steam economy

b)

Compactness

c)

Simple design

d)

Single-stage operation

29.

Which heat exchanger is best for viscous fluids?

a)

Plate heat exchanger

b)

Double-pipe exchanger

c)

Scraped surface heat exchanger

d)

Finned tube exchanger

30.

Which parameter is represented by "ΔT1" and "ΔT2" in LMTD formula?

a)

Pressure difference

b)

Flow velocity

c)

Volume flow

d)

Temperature differences at exchanger ends

31.

Which type of reboiler is commonly used in distillation columns?

a)

Kettle reboiler

b)

Plate heat exchanger

c)

Falling film evaporator

d)

Forced circulation evaporator

32.

Which problem is common in surface condensers?

a)

Tube fouling and scaling

b)

Steam carryover

c)

Direct contamination

d)

Thermal runaway

33.

Which is the purpose of an economizer in boilers?

a)

Cool exhaust gases

b)

Increase boiler pressure

c)

Increase steam velocity

d)

Preheat feedwater using flue gases

34.

Which type of heat exchanger uses rotating drums for drying?

a)

Plate exchanger

b)

Shell-and-tube

c)

Rotary drum dryer

d)

Spiral exchanger

35.

Which type of air cooler rejects heat without water consumption?

a)

Spray pond

b)

Cooling tower

c)

Air-cooled finned exchanger

d)

Jet condenser

36.

Which parameter increases fouling resistance?

a)

Smooth tube surface

b)

Proper chemical treatment

c)

High turbulence

d)

Impurities in fluids

37.

Which parameter is increased in finned tube heat exchangers?

a)

Tube diameter

b)

Pressure drop

c)

Heat transfer area

d)

Flow velocity

38.

Which cooling method is most effective when water is scarce?

a)

Water cooling

b)

Air cooling

c)

Jet condensation

d)

Spray ponds

39.

Which heat exchanger design gives highest heat recovery?

a)

Counterflow arrangement

b)

Parallel flow

c)

Crossflow

d)

Mixed flow

40.

Which factor increases LMTD correction factor?

a)

Pure counterflow

b)

Parallel flow

c)

Crossflow or multi-pass

d)

Small ΔT1/ΔT2

41.

Which parameter is reduced by using baffled shell-and-tube exchangers?

a)

Gas velocity

b)

Dead zones

c)

Pressure drop

d)

Fouling

42.

Which is the main limitation of plate heat exchangers?

a)

High turbulence

b)

Compact design

c)

High efficiency

d)

Cannot handle very high pressure

43.

Which problem occurs if exchanger tubes vibrate excessively?

a)

Increased heat transfer

b)

Improved efficiency

c)

Reduced pressure drop

d)

Tube rupture and leakage

44.

Which code governs pressure vessel design including exchangers?

a)

ASME Section VIII

b)

API 610

c)

TEMA

d)

ASTM A36

45.

Which is the main advantage of crossflow heat exchangers?

a)

Maximum temperature difference

b)

No fouling

c)

Very low pressure drop

d)

Compact design with good effectiveness

46.

Which is the function of expansion joints in exchangers?

a)

Increase turbulence

b)

Absorb thermal expansion

c)

Increase area

d)

Increase fluid velocity

47.

Which arrangement provides maximum mean temperature difference?

a)

Parallel flow

b)

Crossflow

c)

Multi-pass

d)

Counterflow

48.

Which is the role of condensers in power plants?

a)

Reheat steam

b)

Reduce turbine efficiency

c)

Increase boiler pressure

d)

Condense exhaust steam and improve cycle efficiency

49.

Which type of exchanger is widely used in food processing?

a)

Plate heat exchanger

b)

Spiral exchanger

c)

Shell-and-tube

d)

Air-cooled

50.

Which factor reduces pressure drop in exchangers?

a)

More tube passes

b)

Small tube diameter

c)

Large tube diameter and shorter length

d)

Higher turbulence

51.

Which is the primary purpose of material handling equipment?

a)

Reduce product quality

b)

Replace production equipment

c)

Increase energy consumption

d)

Move, store, and control materials efficiently

52.

Which is the most common conveyor in industries?

a)

Screw conveyor

b)

Chain conveyor

c)

Belt conveyor

d)

Pneumatic conveyor

53.

Which formula expresses capacity of a belt conveyor?

a)

Q = F x d

b)

Q = m x Cp x T

c)

Q = A x V x p

d)

Q = P x V

54.

In Q = A × v × ρ, what does v represent?

a)

A conveyor length

b)

Belt velocity

c)

Bulk density

d)

Cross-sectional area

55.

Which conveyor is used for vertical lifting of bulk solids?

a)

Screw conveyor

b)

Pneumatic conveyor

c)

Bucket elevator

d)

Roller conveyor

56.

Which conveyor uses a rotating helical blade inside a tube?

a)

Screw conveyor

b)

Roller conveyor

c)

Chain conveyor

d)

Belt conveyor

57.

Which factor increases belt conveyor capacity?

a)

Lower speed

b)

Larger belt width and higher speed

c)

Reduced area

d)

Lower bulk density

58.

Which conveyor is used for moving unit loads?

a)

Screw conveyor

b)

Roller conveyor

c)

Pneumatic conveyor

d)

Bucket elevator

59.

Which conveyor is best for dusty materials like cement?

a)

Belt conveyor

b)

Pneumatic conveyor

c)

Bucket elevator

d)

Chain conveyor

60.

Which conveyor uses flights attached to chains?

a)

Belt conveyor

b)

Drag conveyor

c)

Screw conveyor

d)

Roller conveyor

61.

Which factor increases belt tension in conveyors?

a)

Longer length and higher load

b)

Reduced load

c)

Smaller pulley diameter

d)

Low friction

62.

Which equation expresses effective belt tension?

a)

Te=T1−T2T_e = T_1 - T_2

b)

Te=P×vT_e = P \times v

c)

Te=F/AT_e = F / A

d)

Te=m×gT_e = m \times g

63.

Which factor determines minimum pulley diameter in belt conveyors?

a)

Belt construction and flexibility

b)

Belt speed

c)

Conveyor length

d)

Ambient temperature

64.

Which device keeps belt tight and prevents slippage?

a)

Take-up pulley

b)

Idler roller

c)

Head pulley

d)

Snub pulley

65.

Which is the main advantage of screw conveyors?

a)

Very long-distance transport

b)

Low power consumption at all capacities

c)

Dust-free only in vertical operation

d)

Can handle semi-fluid materials

66.

Which material handling device is used for lifting heavy loads vertically in plants?

a)

Roller conveyor

b)

Screw conveyor

c)

Hoist

d)

Drag conveyor

67.

Which type of crane moves on parallel runways with a bridge across?

a)

Jib crane

b)

Overhead crane

c)

Gantry crane

d)

Tower crane

68.

Which crane is mounted on a wall or column?

a)

Overhead crane

b)

Gantry crane

c)

Jib crane

d)

Tower crane

69.

Which type of conveyor is most energy-intensive?

a)

Belt conveyor

b)

Screw conveyor

c)

Pneumatic conveyor

d)

Chain conveyor

70.

Which factor reduces spillage in belt conveyors?

a)

Higher belt speed

b)

Larger pulley diameter

c)

Reduced friction

d)

Proper skirt boards and sealing

71.

Which material handling system uses pipelines to transport materials with air?

a)

Screw conveyor

b)

Pneumatic conveyor

c)

Drag conveyor

d)

Roller conveyor

72.

Which factor increases pneumatic conveyor efficiency?

a)

Low air velocity

b)

High leakage

c)

Reduced blower capacity

d)

Proper air velocity and pressure balance

73.

Which conveyor type is best for fragile materials like grains?

a)

Belt conveyor

b)

Screw conveyor

c)

Chain conveyor

d)

Pneumatic conveyor

74.

Which factor reduces belt conveyor power consumption?

a)

Higher friction

b)

Low rolling-resistance idlers

c)

Smaller pulley

d)

Loose belt tension

75.

Which is the primary advantage of roller conveyors?

a)

Long-distance bulk transport

b)

Dust-free handling of cement

c)

Pneumatic efficiency

d)

Simple and suitable for unit loads

76.

Which type of conveyor has buckets attached to a chain or belt?

a)

Screw conveyor

b)

Pneumatic conveyor

c)

Roller conveyor

d)

Bucket elevator

77.

Which factor increases the risk of belt mistracking?

a)

Correct tension

b)

Centered loading

c)

Misaligned pulleys and idlers

d)

Proper alignment

78.

Which formula is used to calculate power of belt conveyor?

a)

P=Q×Cp×ΔTP = Q \times C_p \times \Delta T

b)

P=F/AP = F / A

c)

P=m×g×hP = m \times g \times h

d)

P=(Te×v)/1000P = (T_e \times v) / 1000

79.

Which factor increases wear of conveyor belts?

a)

Smooth materials

b)

Abrasive materials

c)

Proper alignment

d)

Correct speed

80.

Which is the function of idlers in belt conveyors?

a)

Lift the belt vertically

b)

Support and guide the belt

c)

Reduce belt width

d)

Provide drive power

81.

Which type of conveyor is used in coal handling plants?

a)

Screw conveyor

b)

Belt conveyor

c)

Pneumatic conveyor

d)

Roller conveyor

82.

Which factor reduces conveyor downtime?

a)

Preventive maintenance

b)

Ignoring misalignment

c)

High speed only

d)

Overloading

83.

Which type of lift is suitable for moving materials between floors?

a)

Passenger elevator

b)

Freight elevator

c)

Screw conveyor

d)

Jib crane

84.

Which device prevents reverse movement of bucket elevators?

a)

Idler

b)

Backstop

c)

Counterweight

d)

Snub pulley

85.

Which is the main limitation of screw conveyors?

a)

Ability to handle liquids

b)

Simple design

c)

Dust-free operation

d)

Limited conveying distance

86.

Which factor increases the load capacity of roller conveyors?

a)

Larger roller diameter and closer spacing

b)

Smaller roller diameter

c)

Lower roller strength

d)

Reduced roller spacing

87.

Which type of conveyor is used in cement pneumatic systems?

a)

Screw conveyor

b)

Roller conveyor

c)

Air slide conveyor

d)

Belt conveyor

88.

Which factor improves belt conveyor safety?

a)

Misaligned pulleys

b)

Higher belt speed only

c)

Loose tension

d)

Emergency stop pull cords

89.

Which device reduces dust during material transfer?

a)

Backstop

b)

Snub pulley

c)

Dust collection hood

d)

Skirt board

90.

What is the purpose of conveyor chutes?

a)

Reduce belt width

b)

Guide material from one conveyor to another

c)

Dust-free material flow

d)

Increase conveyor speed

91.

Which material handling device uses rope and drum mechanism?

a)

Hoist

b)

Screw conveyor

c)

Pneumatic conveyor

d)

Roller conveyor

92.

Which type of crane is used outdoors with rails on ground?

a)

Overhead crane

b)

Jib crane

c)

Gantry crane

d)

Tower crane

93.

Which conveyor is best for handling hot clinker?

a)

Pneumatic conveyor

b)

Screw conveyor

c)

Drag chain conveyor

d)

Belt conveyor

94.

Which factor increases noise in conveyors?

a)

Proper lubrication

b)

Correct alignment

c)

Balanced pulley

d)

Worn-out idlers and rollers

95.

Which type of bucket elevator is suitable for fine powders?

a)

Centrifugal bucket elevator

b)

Roller elevator

c)

Belt lift

d)

Continuous bucket elevator

96.

Which is the typical inclination limit of belt conveyors for bulk solids?

a)

30–35 degrees

b)

45–50 degrees

c)

18–20 degrees

d)

5–8 degrees

97.

Which factor improves energy efficiency of conveyors?

a)

Overloading

b)

Variable speed drives

c)

Worn-out belts

d)

Excess friction

98.

Which material handling system uses vacuum for transport?

a)

Pneumatic conveyor

b)

Screw conveyor

c)

Roller conveyor

d)

Chain conveyor

99.

Which factor increases capacity of pneumatic conveyors?

a)

Proper solids-to-air ratio

b)

Low air pressure

c)

High leakage

d)

Small pipeline diameter

100.

Which type of conveyor is widely used in airports for baggage handling?

a)

Belt conveyor

b)

Screw conveyor

c)

Roller conveyor

d)

Bucket elevator

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