Aspen HYSYS® Certified User Exam_

Exam Instructions
This exam is divided into two sections: Section 1 measures your understanding of the concepts and
Section 2 consists of a lab. The exam is multiple choice with only one correct answer per question.
You will have up to 4 hours to complete the exam. Aids are permitted during the exam and limited to
AspenTech training material and AspenTech software. Mobile phones must be shut off and put away.
Good luck!
77,
If a user adds a component list using HYSYS Databank, which Property Package
database/s can be used to define the Fluid Package?. Single choice.
(1 Point)
A. HYSYS Databank
B. Only Aspen Properties
C. COMThermo
D. Either A or C
88,
For Aspen HYSYS to estimate the hypothetical component’s unknown properties,
the following minimum information must be supplied. Single choice.
(1 Point)
A. Enthalpy
B. Molecular Weight and Liquid Density
C. Normal Boiling Pt
D. Either B or C
99,
What type of information is exported as a binary file with the extension ‘.fpk’?.
Single choice.
(1 Point)
A. Component list defined in the Component Lists folder only
B. Property Package selected including binary coefficients only
C. Component list defined and Property Method Package Selected
D. None of the above
1010,
What kind of options can be used for characterizing a crude assay with TBP
distillation data in Aspen HYSYS?. Single choice.
(1 Point)
A. Correlation Manager
B. HYSYS Petroleum Assay Manager
C. Component list with hypothetical component
D. Either A or B
1111,
What are the necessary steps to characterize a crude assay using Aspen
Petroleum Assay Manager?. Single choice.
(1 Point)
A. Characterize the assay, specify/import assay data, and attach assay data with a material
stream
B. Specify/import assay data, characterize the assay, and attach assay data with a material stream
C. Install material stream and specify/import assay data
D. Import assay data and attach assay data with a material stream
1212,
What is the main difference between the Oil Manager and Petroleum Assay
Management characterization tools?. Single choice.
(1 Point)
A. Both Oil Manager and Assay Manager uses the cut point on Midpoint basis
B. Oil Manager uses end point basis
C. Assay Manager uses End Point basis
D. Oil Manager does not create hypo components for its blend
1313,
What is the minimum information needed to solve a material stream?. Single
choice.
(1 Point)
A. Composition and temperature
B. Mass flowrate and temperature
C. Composition, temperature, pressure, and flowrate (mass/molar/volumetric)
D. Composition and flowrate (mass/molar/volumetric)
1414,
Identify the mathematical/logical operations in Aspen HYSYS from the following:.
Single choice.
(1 Point)
A. Pump, Cooler
 B. Balance, Adjust, Set
C. Balance, Heater
D. Set, User Property
1515,
A user needs to achieve a target liquid product rate from the separator by
manipulating the feed temperature. Select the logical operation(s) that should be
used.. Single choice.
(1 Point)
A. Recycle
B. Set
C. Adjust
D. B and C
1616,
A Recycle operation should be used when. Single choice.
(1 Point)
A. Downstream material streams are mixed with upstream material streams
B. Closed loop flowsheet
C. Both A & B
D. Either A or B
1717,
Which of the following is TRUE regarding Adjust Operation?. Single choice.
(1 Point)
A. The Independent variable cannot be a calculated value; it must be specified.
B. The Independent variable can be a calculated value.
C. The Adjust is a steady state operation; HYSYS ignores it in dynamic mode.
D. Both A&C
1818,
Identify the types of Stream Analysis in Aspen HYSYS types from the following:.
Single choice.
(1 Point)
A. Hydrate Formation, Envelope, Critical Properties
B. User Property, Correlation Manager, Oil Manager
C. Either A or B
D. Both A & B
 1919,
If a user wants to review the trend of the stream density along with the stream T
& P, how can that be achieved in Aspen HYSYS?. Single choice.
(1 Point)
A. Open the stream, add the stream analysis from Attachments | Analysis, then select Property
Table.
B. Add the Stream Analysis - Property Table to this stream from the Home Ribbon.
C. Add a Property Table on the Stream Analysis folder in the left Navigation.
D. Either A, B or C
2020,
If a user has petroleum assay attached to a stream and would like to check the
ASTM D86 boiling curve and TBP of the petroleum product stream, which of the
following tools should be used?. Single choice.
(1 Point)
A. Stream Analysis tools - Boiling Point Curves
B. Stream Analysis tools - Petroleum Assay
C. Stream Analysis tools - Property Table
D. Case Studies
2121,
Which of the following statements is FALSE regarding Envelope Stream Analysis?.
Single choice.
(1 Point)
A. Using Envelope Analysis, Vapor-Liquid Envelopes can be plotted for Pressure-Enthalpy,
Pressure-Temperature variables.
B. The Envelope Analysis is restricted to the Peng-Robinson, SRK, and Glycol property packages.
C. A hydrate curve can be plotted with the Envelope Analysis.
D. The Envelope Analysis is restricted to the Peng-Robinson, SRK, SourPR, and SourSRK.
2222,
While building an open loop flowsheet, the user decides to mix a downstream
material stream with the upstream material. The user can include the Recycle
operation in the flowsheet by. Single choice.
(1 Point)
Procedure (1) Estimate the recycle stream, then solve the flowsheet, then add a recycle operation and
finally attach the estimated and calculated streams Procedure (2) Add a recycle operation, then attach
the calculated and estimated streams and finally connect the estimated stream to the flowsheet
A. Procedure (1) ALONE is sufficient, but Procedure (2) alone is NOT sufficient.
 B. Procedure (2) ALONE is sufficient, but Procedure (1) alone is NOT sufficient.
C. BOTH Procedure TOGETHER are sufficient, but NEITHER Procedure ALONE is sufficient.
D. EACH Procedure ALONE is sufficient.
2323,
If a user has multiple feeds with one vapor and two liquid product streams, which
of the following separator operations should be selected?. Single choice.
(1 Point)
A. Separator
B. Tank
C. 3-Phase Separator
D. 2-Phase Separator
2424,
Which of the following simulation analysis tool allows the user to monitor the
steady state response of key variables to changes in their process?. Single choice.
(1 Point)
A. Property Table
B. Case Study
C. Workbook
D. None of the above
2525,
If a user has setup a Nested Case Study for 2 independent variables (Variable A &
B) to monitor the response of 1 dependent variable and the number of steps for
Variable A is 7 and for Variable B is 4. How many total states will the case study
run for?. Single choice.
(1 Point)
A. 11
B. 28
C. 22
D. 32
2626,
What type of exchanger specification should be provided if the user wants to
include the minimum temperature difference between the hot and cold stream
(not necessarily at the inlet or outlet)?. Single choice.
(1 Point)
A. Delta Temperature
 B. Minimum Approach
C. LMTD
D. Duty
2727,
A simple heat exchanger unit is required in the simulation to estimate the UA for
a gas condensing process. No sizing data is available for the unit. What type of
heat exchanger model is required?. Single choice.
(1 Point)
A. Simple Weighted
B. Simple End Point
C. Simple Steady State Rating
D. Either B or C
2828,
There are several correlation methods for calculating pressure drop of a pipe
segment, which of the following methods could be used for flow through a
horizontal pipe with expected liquid hold-up calculated and the ability to define a
flow regime map?. Single choice.
(1 Point)
A. Beggs & Brill (1973 or 1979)
B. HTFS Homogeneous, HTFS Liquid Slip
C. Aziz, Govier, & Fogarasi
D. Either A or C
2929,
A pipe is buried 1.5 m deep underground and has a Urethane Foam insulation of
0.05 m, which of the following heat transfer options can be selected for
performing the rigorous heat transfer calculation for this pipe operation?. Single
choice.
(1 Point)
A. Overall HTC option and Heat Loss option to calculate heat transfer
B. Segment HTC option to define heat transfer for each pipe segment
C. Estimate HTC option
D. None of the above
3030,
Which of the following is correct for a 100 m long horizontal pipe segment?.
Single choice.
(1 Point)
A. Elevation Change is -100.0
B. Elevation Change is 100.0
C. Elevation Change is 0.0
D. None of the above
3131,
If the fluid temperature is lower than the hydrate formation temperature, then
there is a potential problem in the process. How does one check the hydrate
formation temperature in the pipeline?. Single choice.
(1 Point)
A. Use the Hydrate Formation Stream Analysis tool for the inlet and out streams
B. Perform Hydrates Profile Calculation (Flow Assurance) in the pipe
C. Perform Slug Analysis or Wax Deposition
D. Either A or B
3232,
Which of the following Pipe Flow Assurance studies can be applied for studying
the continuous impact of particles (liquids or solids) on the pipe wall surface?.
Single choice.
(1 Point)
A. CO2 Corrosion
B. Wax Deposition
C. Erosion
D. Either A or B
3333,
A compressor operation has curves at 4 different speeds. The inlet and outlet
stream compositions, inlet temperature, inlet pressure and inlet flowrate are
known. What additional inputs are required to solve the compressor?. Single
choice.
(1 Point)
A. Discharge pressure
B. Speed
C. Discharge temperature
D. Either A or B
3434,
In Aspen HYSYS, a heat exchanger block has been added onto the flowsheet and
inlet/outlet streams have been connected. Both the hot side and cold side inlet
streams have been fully solved. Meanwhile, we have provided the pressure drop
on the shell side and tube side of the exchanger. What else do we need to specify
in order to solve the heat exchanger block?. Single choice.
(1 Point)
Statement (1) The duty of the exchanger. Statement (2) The outlet temperature of shell side stream.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
3535,
The Reboiled Absorber template consists of ____________.. Single choice.
(1 Point)
A. a Tower and a bottom reboiler.
B. a Tower and an overhead Condenser (partial or total).
C. Both A & B
D. Either A or B
3636,
The degrees of freedom for a refluxed column with a partial condenser and a
liquid pump around from stage 6 to stage 5 is_______________.. Single choice.
(1 Point)
A. 1
B. 2
C. 3
D. 4
3737,
Which of the following Column Specification Types should be used to specify the
molar ratio of a set of components over another set of components for the liquid
phase on any stage?. Single choice.
(1 Point)
A. Component Recovery
B. Component Ratio
C. Component Fractions
 D. Component Flow Rate
3838,
Which of the following reasons apply here for the column unconverged status
due of Degrees of Freedom as shown below?. Single choice.
(1 Point)

A. Column is unconverged as fewer column specifications are given than needed

B. Column is unconverged as more column specifications are given than needed
C. Column is unconverged as no column specifications are given
D. None of the above
3939,
In order to view flowrate in tonnes/hr, what are the necessary steps to be taken?.
Single choice.
(1 Point)
A. Go to File | Options and select SI Units of Measure default set
B. Go to File | Options, copy SI Units of Measure default set to create custom set, change the
units of Mass Flow to tonnes/hr
C. Go to File | Options and select Field Units of Measure default set
D. Go to File | Options, copy Field Units of Measure default set to create custom set, change the
units of Molar Flow to tonnes/hr
4040,
Which of the following is TRUE about the Spreadsheet Operation?. Single choice.
(1 Point)
A. Drag & drop variable values from a stream or unit operation to the Spreadsheet
B. Only variables that are calculated by the Spreadsheet are exportable to the flowsheet
C. A variety of mathematical operations are supported, such as formulas, functions, inequalities,
logical operations, IF/THEN/ELSE statements, etc.
D. All of the above
4141,
How can a user customize General user preferences, options, and default settings
in Aspen HYSYS?. Single choice.
(1 Point)
 A. The user can customize/configure the general options and default setting under File | Options.
B. The user can customize General user preferences from the Customize Ribbon.
C. The user can customize General user preferences and default settings in each Unit Operation
and Stream.
D. The user cannot configure the general options and default settings.
4242,
If the inlet stream of a cooler is fully specified, what parameters should be
defined to solve the cooler?. Single choice.
(1 Point)
A. Delta P, Delta T, and Duty
B. Duty and outlet stream T
C. Delta P and Delta T
D. Outlet stream pressure and Delta P
4343,
There is a V-L Vessel, inlet stream pressure is 6156.5 kPa, Vapour outlet stream
pressure is 6106.5 kPa and liquid outlet stream pressure is 6136.5 kPa, how can a
user define this vessel Delta P to obtain the correct pressure profile?. Single
choice.
(1 Point)
A. Define Delta P for Inlet as 50 kPa and Delta P for Vapour outlet as 0 kPa.
B. Define Delta P for Inlet as 20 kPa and Delta P for Vapour outlet as 30 kPa.
C. Define Delta P for Inlet as 30 kPa and Delta P for Vapour outlet as 20 kPa.
D. Define Delta P for Inlet as 0 kPa and Delta P for Vapour outlet as 50 kPa.
4444,
Cooling water is used to cool a gas stream. All heat exchanger inlet streams are
fully specified, both shell and tube side pressure drops are given, and gas stream
outlet T is specified. The heat exchanger is converged, however, after checking
the performance, the user found that Min. Approach is 30°C, and the duty is
lower than expected. Which of the following is the best option to maximize the
heat exchanger duty?. Single choice.
(1 Point)
A. Delete the gas stream outlet T, define LMTD as the Specification to effectively use the cold
utility.
B. Adjust the gas stream outlet T until the Min. Approach is lower to effectively use the cold
utility.
 C. Delete the gas stream outlet T, define Min. Approach larger than 5°C but smaller than 30°C as
the Specification to effectively use the cold utility.
D. There is no way to optimize the heat exchanger because all parameters are defined.
4545,
Which kind of heat transfer operations can be integrated with Aspen Exchanger
Design and Rating (EDR) tools?. Single choice.
(1 Point)
A. Heat Exchanger, Cooler, Heater
B. Heat Exchanger, Fired Heater
C. Air Cooler, LNG Exchanger
D. Both B and C
4646,
What kind of report can be added to the flowsheet?. Single choice.
(1 Point)
A. Data Table
B. Workbook
C. Model Summary
D. Both A & B
4747,
Which of the following can be sources for Sub-Flowsheet?. Single choice.
(1 Point)
A. Previously saved process template file (*.tpl)
B. Previously saved HYSYS flowsheet file (*.hfl)
C. Previously saved HYSYS compound file (*. hscz)
D. Both A & B
4848,
What does the following message indicate?. Single choice.
(1 Point)
 A. Stream ‘Process In’ Pressure is underspecified
B. Stream ‘Process In’ Pressure is overspecified
C. Solver is ‘On Hold’
D. Both B & C
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Aspen HYSYS® Certified User Exam_

Section 2: Aspen HYSYS Lab

Problem Statement: You have been tasked to construct a simulation for the treatment of an NGL
feed. The NGL will be processed in a depropanizer column for the recovery of desired hydrocarbon
products. The feed contains light gases which must be separated before feeding the depropanizer
column. Process Description: NGL is first separated from vapor in a 2-phase separator. The light
gases from the separator will be compressed before exporting to the pipeline. The liquid product
from the separator is pumped to a heat exchanger and then to a heater before feeding the
depropanizer column. The column will separate most light gases (ethane and propane). The bottom
liquid product will be transported to a third-party facility for further fractionation. You will not be
simulating the third-party facility. The depropanizer has 24 stages, a reboiler, a partial condenser,
and has an operating pressure of 18.25 bar_g. The specification of the column is adjusted such that
the top product contains mostly light products (ethane and propane). To complete the lab, you will
start with a new case, add the components, select the correct fluid package, and build the flowsheet
according to the Flowsheet image and Input Data provided in the next section. After building the
process flowsheet, answer questions 52-67 that follow.

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Aspen HYSYS® Certified User Exam_

Flowsheet
 4949,

Stream Data. Single choice.

 Yes, I've entered stream data.

5050,

Unit Operation Data. Single choice.

yes, I've entered the above unit operation data

5151,

Unit Operation Data. Single choice.

 yes, I've entered the above unit operation data

5252,

What is the duty and LMTD of the Heat Exchanger?. Single choice.

(4 Points)

A. Duty less than 4.920e5 kJ/h and LMTD less than 100C.

B. Duty more than 4.920e6 kJ/h and LMTD less than 100C.

C. Duty between 4.920e6 kJ/h and 5.20e6 kJ/h and LMTD between 120C and 125C
 D. Duty between 4.920e5 kJ/h and 5.20e5 kJ/h and LMTD between 100C and 110C

5353,

If there is requirement to restrict the LMTD of the Heat Exchanger to 118°C, what
is the duty of the Heat Exchanger?. Single choice.

(4 Points)

A. Duty less than 4.920e5 kJ/h

B. Duty more than 5.20e6 kJ/h

C. Duty more than 4.920e7 kJ/h

D. Duty between 4.920e5 kJ/h and 5.20e5 kJ/h

5454,

The Cricondentherm and Two-Phase Critical Temperature for the NGL Feed
stream are:. Single choice.

(3 Points)

A. Cricondentherm is above 190°C and Two-Phase Critical Temperature is below 190°C

B. Cricondentherm is above 170°C and Two-Phase Critical Temperature is above 170°C

C. Cricondentherm is below 170°C and Two-Phase Critical Temperature is below 170°C

D. None of the above

5555,

What is the mole fraction of C2 +C3 in Propane stream?. Single choice.

(4 Points)

A. Less than 0.2

B. Between 0.2 and 0.6

C. Between 0.85 and 0.95

D. More than 0.95

 5656,

What is the Reboiler and Condenser duty of the Depropanizer?. Single choice.

(4 Points)

A. Condenser Duty less than 2.10e6 kJ/h and Reboiler duty more than 5.70e7 kJ/h.

B. Condenser Duty more than 2.10e8 kJ/h and Reboiler duty less than 5.70e8 kJ/h.

C. Condenser Duty between 2.10e7 kJ/h and 3.101e7 kJ/h and Reboiler duty between 4.70e7
kJ/h and 4.90e7 kJ/h

D. Condenser Duty between 2.00e7 kJ/h and 2.25e7 kJ/h and Reboiler duty between 5.60e7 kJ/h
and 5.90e7 kJ/h

5757,

You are required to modify the process so that the lights from the top of the
column contains mostly ethane and propane. Add a new specification such that
the mole fraction for C2+C3 in the Propane stream is 0.98. The reflux ratio is still
mainlined at 2. How does the flowrate of stream C4+ change?. Single choice.

(4 Points)

A. Flowrate did not change

B. Flowrate increased

C. Flowrate decreased

5858,

How do the Reboiler and Condenser duties change after the new specification
modification?. Single choice.

(3 Points)

A. Reboiler and Condenser duty did not change

B. Reboiler duty increased and Condenser duty decreased

C. Reboiler duty decreased and Condenser duty decreased

 D. Reboiler duty increased and Condenser duty increased

5959,

The condenser and reboiler use utilities for cooling and heating. Report the
cooling water flow rate in the condenser, and HP steam flowrate in the reboiler..
Single choice.

(4 Points)

A. Cooling Water Flowrate is more than 9.10e5 kg/h and HP Steam Flowrate is less than 3.10e3
kg/h

B. Cooling Water Flowrate is less than 9.10e4 kg/h and HP Steam Flowrate is more than 3.17e5
kg/h

C. Cooling Water Flowrate is more than 9.10e5 kg/h and HP Steam Flowrate is more than 3.00e5
kg/h

D. Cooling Water Flowrate is less than 9.10e5 kg/h and HP Steam Flowrate is more than 3.00e4
kg/h

6060,

What is the power of the compressor and pump?. Single choice.

(4 Points)

A. Compressor Power is less than 40 kW and Pump Power is less than 130 kW

B. Compressor Power is more than 40 kW and Pump Power is less than 130 kW

C. Compressor Power is less than 45 kW and Pump Power is less than 100 kW

D. Compressor Power is more than 40 kW and Pump Power is more than 130 kW

6161,

You have just received the compressor curves from the vendor (see table below)
and need to add the curves data for accurate calculations of efficiency, power and
speed of the compressor. Report the compressor power, speed, and adiabatic
efficiency after implementing the curves. How do the curves impact the Adiabatic
efficiency of the Compressor?. Single choice.
(3 Points)

A. Compressor Efficiency decreased

B. Compressor Efficiency increased

C. Compressor Efficiency had no impact

6262,

You are required to calculate the dewpoint temperature of the Process Out
stream using a Balance Operation at the same pressure, flow rate and
composition. What is the calculated dew point temperature?. Single choice.

(4 Points)

A. Less than 135°C

B. Between 125°C and 135°C

C. Between 135°C and 140°C

D. More than 140°C

6363,

Without doing any manual calculations, what is the total flow inlet & outlet
streams to achieve an overall mass balance for the flowsheet?. Single choice.
(3 Points)

A. The total flow inlet streams is between 3.5e5 Kg/h and 3.6e5 Kg/h

B. The total flow inlet & outlet streams is between 1.5e5 Kg/h and 1.6e5 Kg/h

C. The total flow outlet streams is between 1.5e7 Kg/h and 1.6e7 Kg/h

D. None of the above

6464,

If an insulation (Urethane Foam) of 0.05 m thickness is used while the pipe is still
buried 1 m deep in Ground, how does the heat loss of the pipe change?. Single
choice.

(3 Points)

A. Heat Loss increased more than 75%

B. Heat Loss decreased between 45% and 55%

C. Heat Loss decreased less than 35%

D. None of the above

6565,

You are required to study the impact of NGL feed throughput to heat exchanger,
pump and compressor. Configure a case study for NGL feed flow rate from 160
m3/h to 280 m3/h with a step of 20 m3/h and report the heat exchanger process
out temperature, and the power requirements by the compressor and pump.
What are the trends of the temperature and pump power vs NGL feed flow rate?.
Single choice.

(4 Points)

A. The power increases and the temperature increases with higher flowrates

B. The power decreases and the temperature decreases with higher flowrates

C. The power increases and the temperature decreases with higher flowrates
 D. The power decreases and the temperature increases with higher flowrates

6666,

Using the Rigorous Shell & Tube exchanger model, design the exchanger (E-100)
for the following specifications and determine the duty of the Heat Exchanger..
Single choice.

(4 Points)

A. Duty less than 4.50e5 kJ/h

B. Duty between 4.50e5 kJ/h and 5.50e5 kJ/h

C. Duty more than 5.20e7 kJ/h

D. Duty between 5.20e6 kJ/h and 5.50e6 kJ/h

6767,

If the COL Feed temperature is targeted to be 55℃, what should be the NGL feed
flowrate?. Single choice.

(3 Points)

A. Flowrate less than 150 m3/h

B. Flowrate more than 180 m3/h

C. Flowrate is between 150 m3/h and 180 m3/h

D. None of the above

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