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WorksheetsPractical lab test
Total questions: 27
Worksheet time: 28mins
Control Valve – What is the main purpose of this experiment? (Select all that apply)
To study heat transfer in fluids
To understand I/P and control valve operation
To compare signal trends for Air-to-Open (ATO) and Air-to-Close (ATC) control valves
To test pump discharge performance
Control valve - The I/P converter receives a current signal of ___ mA and converts it into a pneumatic output pressure of ___ psig.
4–20 mA and 3–15 psig
0–20 mA and 0–10 psig
10–30 mA and 5–25 psig
4–12 mA and 3–9 psig
True or False for control valve - The Instrument Air Supply (IAS) for the I/P converter should be set to 1.4 bar during the experiment.
True
False
Control valve - Explain the purpose of performing a five-point calibration on the I/P converter.
To verify the linear relationship between input current and output pressure and identify any zero drift or span error
To increase the instrument air supply pressure to its maximum rating
To determine the valve body material and actuator type
To select the appropriate piping schedule for the control loop
Control valve - Which terminals are used for adjusting the zero and span of the I/P converter?
'—○—' and '<– –>'
'Zero+' and 'Span-'
'mA+' and 'mA-'
'SUP' and 'OUT'
Control valve - In an Air-to-Open (ATO) control valve, the valve is ___ when the input current is 4 mA and ___ when the current is 20 mA.
fully open, fully closed
fully closed, fully open
partially open, partially closed
fully open, fully open
Control valve - In an Air-to-Close (ATC) control valve, the valve is ___ when the input current is 4 mA and ___ when the current is 20 mA.
fully open, fully closed
fully closed, fully open
partially closed, partially open
fully closed, fully closed
Control valve - If the input current is 8 mA, calculate the theoretical output pressure for a 3–15 psig range.
3 psig
6 psig
9 psig
12 psig
Control valve - During calibration, if the measured output pressure is higher than the theoretical value, what adjustment should be made?
Reduce the span using the '<– –>' terminal on the I/P converter
Increase the zero using the '—○—' terminal on the I/P converter
Increase the instrument air supply pressure
Reverse the I/P converter input polarity
Level Measurement (DLT 912) – Which of the following level measurement methods are studied in this experiment? (Select all that apply)
DP-diaphragm
DP-bubble tube
Ultrasonic sensor
Millimetres scale
Level Measurement (DLT 912) - The main objective of this experiment is to study the fundamental principles of _____ and compare different level measurement methods.
level/hydrostatic principles
pressure/thermodynamic cycles
electromagnetic induction
optical interference
Level Measurement (DLT 912) - True or False: LT1 measures level using a bubble tube arrangement, and LT2 uses diaphragm seals.
True
False
Level Measurement (DLT 912) - What should be the instrument air supply (IAS) pressure during the experiment setup?
20 psig
25 psig
32 psig
40 psig
Level Measurement (DLT 912) - Why must tank T3 be filled with water up to the marked level before beginning the experiment?
To ensure proper circulation and accurate level measurement across the system
To reduce the pump power consumption
To prevent cavitation in LT1
To calibrate the stirrer speed
Level Measurement (DLT 912) - During the experiment, the pump P1 and the stirrer should be switched _____ before observing the level rise in tank T1.
ON
OFF
Standby
Auto
Level Measurement (DLT 912) - In Experiment 1A, the level in Tank T1 is adjusted to what value before taking readings?
450 mm
500 mm
550 mm
600 mm
Level Measurement (DLT 912) - If the measured pressure difference (DP) at LT1 is 148.6 mmH2O, what is the corresponding level h in mm? Use the calibration formula h = (Measured DP + 557).
696.0 mm
705.6 mm
712.4 mm
734.0 mm
Level Measurement (DLT 912) - According to the hydrostatic principle, the level in a tank can be calculated using which relationship?
h=ρgDP
h=ρg/DP
h=DP×ρg
h=ρDP2
Water flow measurement - Which of the following flow meters are used in this experiment for volumetric flow measurement? Select all that apply.
Turbine flow meter
Orifice / Differential Pressure flow meter
Variable Area flow meter
Electromagnetic flow meter
Water flow measurement - Fill in the blanks in the main flow path: T32 → P32 → ____ → FT31 (FE31) → ____ → T31 → P31 → APPLY CONDITION 2 → ____ → T32. Choose the correct set of components for the three blanks.
FI31, LCV31, FT32
FI31, LIC31, FT31
FE31, LCV31, FT31
FI31, LCV31, FT31
Water flow measurement - In the WLF 922 setup, the LCV31 acts as the final control element that regulates the flow rate.
True
False
Water flow measurement - What is the function of LIC31 in this experiment?
To indicate and control the water level in T31
To measure the temperature of the water
To control the pump operation
To measure the pressure difference across the orifice plate
Water flow measurement - The instrument air supply (IAS) should be set to ____ psig and must not be disturbed during the experiment.
20 psig
32 psig
40 psig
60 psig
Water flow measurement - In the start-up checklist, why must the tank T32 be filled up to the level of its overflow drain pipe before starting the experiment?
To ensure a continuous water supply and maintain constant head for accurate flow measurement
To prevent air entering FI31 only
To protect P32 from overheating
To minimize turbulence in FT31
Water flow measurement - Which of the following conditions correspond to Condition 2 during the start-up procedure?
P32 suction valve closed, discharge valve closed
P31 suction valve open, both discharge valves open
P32 suction valve open, bypass valve open
T31 gate and globe valves fully shut
Water flow measurement - Using the formula Fv=0.03h , calculate the flow rate (in m^3/hr) when h=1600 mmH2O.
0.8 m^3/hr
1.2 m^3/hr
1.6 m^3/hr
3.0 m^3/hr
Water flow measurement - According to the theoretical verification section, what relationship should hold true if the level in the tank is kept constant?
FI31 = FT31 = FT32
FI31 < FT31
FI31 > FT32
FT31 = 0
