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3RD TSSA PART 3 A1 EXAM QUESTIONS & CORRECT
ANSWERS WELL ACED
In the expression 4² = 16, the number '4' is called the _____ of 16. **- CORRECT ANSWER
** Square root. Construction drawings will be drawn to scale and will show: - CORRECT ANSWER >>> Three different views, usually plan, front and side view In the given triangle, calculate the ratio of BC to AC, when angle ADC = 40 degrees, angle BDC = 20 degrees, angle ACD = 90 degrees, and side DC = 8m. https://ibb.co/C9ydKct - CORRECT ANSWER >>> 0. The common logarithm of a number is _________ times its natural logarithm. - CORRECT ANSWER >>> 2.3026. A rhomboid is a plane figure that has four (4) sides, with: - CORRECT ANSWER >>> Opposite sides parallel and opposite angles equal Referring to the diagram below, the point marked as 3 represents https://ibb.co/JpsBDn9 - CORRECT ANSWER >>> Dry saturated steam An I-beam under compressive load is, found to be 0.023 mm shorter than the original length. Given the original length we can find the: - CORRECT ANSWER >>> Linear strain Heat transfer due to movement of a fluid is called: - CORRECT ANSWER >>> Convection Molten pig iron is used to produce: - CORRECT ANSWER >>> Cast iron, wrought iron and steel
A body with a gravitational force of 2000 N is pulled along a horizontal surface at constant speed by a rope, which makes an angle of 20° above the horizontal. If the force on the rope is 150 N, the coefficient of sliding friction is: - CORRECT ANSWER >>> 0. A steel storage tank is 5 m long, 2 m wide and 4 m high. It is 60% full of ethylene glycol with a relative density of 1.1. What is the force load exerted by the fluid on one end? - CORRECT ANSWER >>> 62.2 kN White metal used for slow speed and light load applications is composed of: - CORRECT ANSWER >>> 10% tin, 15% antimony and 75% lead The energy that a body contains due to its motion is referred to as: **- CORRECT ANSWER
** Kinetic MgCl2 + Na2Z --> In a balanced equation for this reaction, the product side should be shown as:
- CORRECT ANSWER >>> MgZ + 2NaCl A material that is able to stand up under a sudden impact or hard blow is described as: - CORRECT ANSWER >>> Tough or having high impact strength If the temperature of a mild steel bar 10 m long is increased from 15 to 75°C, the change in length will be: - CORRECT ANSWER >>> 7.2 mm The figure below shows a hydraulic jack system used for hoisting cars. Assuming the pressure of the air is equal to the pressure on the piston, the piston diameter of 27.5 cm, and the pressure value of 600 kPa that compressor can generate, what is the maximum load (in Newtons) the piston can raise? https://ibb.co/jG8r06G - CORRECT ANSWER >>> 35.64 kN One radian is equal to: - CORRECT ANSWER >>> 57.3 degrees
A solid cylinder is 31 cm in diameter by 2.4 m long. It has the same mass as a lead cube with 0. m sides. What material is the cylinder likely made of? - CORRECT ANSWER >>> Mild steel What temperature change is required to cause a rigidly supported copper pipe 12 m long to develop a stress of 650 MPa? E = 110 x 106 kPa - CORRECT ANSWER >>> 358.1°C A boiler generates 10 kg of dry steam per 2 kg of coal burned. The heating value of the coal is 21,000 kJ/kg. The boiler produces 1500 kPa steam from 60°C feedwater. Calculate the efficiency.
- CORRECT ANSWER >>> 60.5% Ionic compounds are formed by the: - CORRECT ANSWER >>> Transferring of electrons between the atoms The title block on a PFD usually includes the company name plus: 1. The plant in which the equipment is located 2. The name of the plant system covered in the PFD 3. The drawing number 4. The normal operating parameters of the equipment - CORRECT ANSWER >>> 1, 2, 3 The potential energy contained in a mass of 20 kg located 15 m above ground level is: - CORRECT ANSWER >>> 2.943 kJ The term that describes the rate and the direction of motion is: - CORRECT ANSWER >>> Velocity A proton has: - CORRECT ANSWER >>> A positive electrical charge Solve the following equation for r2: Q = 2sL(T2-T1)/ln(r2/r1) when: Q=1,500,000, s=30, T2=275, T1=22, L=10, r1=6. - CORRECT ANSWER >>> 6.
The work done in a constant pressure expansion can be determined by: **- CORRECT ANSWER
** P(V2 - V1) A 20 m^3 volume of perfect gas, initially at 415C and 4250 kPa, undergoes two step changes. First, the gas is cooled at constant volume to a final pressure of 1750 kPa. Second, it is compressed at a constant temperature to 9235 kPa. Calculate the final temperature and volume of the gas. - CORRECT ANSWER >>> T2 = 10.3°C, V2 = 3.79 m³ In order to completely burn 60 kg of carbon the oxygen necessary will be: **- CORRECT ANSWER ** 160 kg The amount of heat transferred through a layer of material by conduction will depend upon the:
- Temperature difference across the layer
- Total time of transfer
- Thickness of the layer
- Surface area of the layer
- Ambient temperature of air surrounding the object - CORRECT ANSWER >>> 1, 2, 3, 4 What is the area of a triangle whose sides measure 4 km, 5 km and 7 km? - CORRECT ANSWER >>> 9.80 km² What is the area of a triangle whose sides measure 4 km, 5 km and 7 km? - CORRECT ANSWER >>> 9.80 km² From the Superheat Tables the symbol "v" means the specific: - CORRECT ANSWER >>> Volume of the steam
min., 14 km in 12 min., 16 km in 18 min., 12 km in 10 min. The average speed during the whole trip is: - CORRECT ANSWER >>> 60.0 km/h A material that does not have ductility will be: - CORRECT ANSWER >>> Brittle A coal conveyor belt, 60 m long, rises at an angle of 18 degrees to the horizontal and then discharges into a bunker. How high above the starting point is the discharge? - CORRECT ANSWER >>> 18.54 m Find the magnitude and direction of the resultant of the given force system. https://ibb.co/XyJ2Spr - CORRECT ANSWER >>> 79.0 N at 57° E of S Stray Currents can be found by: - CORRECT ANSWER >>> Measuring voltage drops and current flows along buried structures and metal pipelines Referring to the triangle ABC below, the ratio of opposite side/adjacent side (b/a) for angle B is called the: https://ibb.co/bmHC2rR - CORRECT ANSWER >>> Tangent of angle B or Tan B A block of stone of 40 kg is hauled along a horizontal floor by a force inclined 20 degrees to the horizontal. If the coefficient of friction between the stone and the floor is 0.3, determine the effort required to just move the stone from rest. - CORRECT ANSWER >>> 112.9 N Calculate the number of 8 cm diameter tubes that can be attached to a circular tube sheet of a heat exchanger that is 1.0 m in diameter. Assume that 50% of the sheet area is used for spacing between the tubes. - CORRECT ANSWER >>> 78 The Characteristic Constant of each perfect gas is - CORRECT ANSWER >>> Unique to that particular gas
A pipe has an inside diameter of 4 cm with an water flow of 5,000 L/hr. The pipe diameter increases to 6 cm. What is the velocity of the water in the larger section? **- CORRECT ANSWER
** 0.49 m/s Sacrificial Anodes are used to reduce galvanic corrosion of tanks and/or vessels by: - CORRECT ANSWER >>> Accepting the corrosion action in place of, or instead of, the main equipment surface The characteristic constant for a gas is given as: - CORRECT ANSWER >>> KJ/Kg K As the acceleration due to gravity is a known constant, the final velocity of a falling body may be found by the formula: - CORRECT ANSWER >>> v = u + at In the following triangle, what is the value of tan A? https://ibb.co/v4gLLDt **- CORRECT ANSWER ** 1. An equilateral triangle has an area of 63.92 m². What is the height of this triangle? - CORRECT ANSWER >>> 10.52 m Steam that is superheated: - CORRECT ANSWER >>> Has a greater specific volume than saturated steam at the same pressure A steam engine has a piston 20 cm in diameter and a piston rod of 4 cm diameter. If the ultimate strength for the rod material is 400,000 kPa and the factor of safety for the rod is 12 then calculate the maximum allowable steam pressure. - CORRECT ANSWER >>> 1,333 kPa Given that one side of a triangle is equal to 8 m, the base is equal to b m and the height is 4 m, the area of this triangle is equal to: - CORRECT ANSWER >>> 2b m²
A body having a mass of 50.97 kg is pulled along a horizontal flat surface at a constant speed by a force of 180 N, which makes an angle of +30° with the horizontal. Find the coefficient of kinetic friction for the surfaces. - CORRECT ANSWER >>> 0. Actual mechanical advantage divided by velocity ratio is equal to: **- CORRECT ANSWER
** Efficiency In the following triangle, find the value of Cos B and its corresponding angle: https://ibb.co/v4gLLDt - CORRECT ANSWER >>> 0.80, 36.87 degrees Compression and expansion in real life cases will always follow the polytropic process that is described by the formula(s):
- P1V1 = P2V
- P1V1 n = P2V2 n
- PVn = Constant
- PV = Constant - CORRECT ANSWER >>> 2, 3 A beam 40 m long overhangs at both ends. If it carries distributed loads of 100 kN/m and 200 kN/m as shown, calculate the reactions at the supports. https://ibb.co/XyQZcxM - CORRECT ANSWER >>> R1 = 1161.54 kN, R2 = 2638.46 kN White liquor, used in Kraft pulp mills to cook the wood chips, is made up of a mixture of: - CORRECT ANSWER >>> Sodium hydroxide, sodium sulphide and water Find the magnitude of equilibrant and resultant forces for the force system shown. Use the scale of 1 cm = 5 N. https://ibb.co/JcvVZFp - CORRECT ANSWER >>> 75 N A simple beam carries a pointed load of 2000 N as shown. Calculate the reactions at supports. https://ibb.co/XtLGHPj - CORRECT ANSWER >>> R1 = 1000 N, R2 = 1000 N
If the enthalpy of each kg of steam is only 2650.3 kJ and the pressure is 4000 kPa, calculate the dryness fraction. - CORRECT ANSWER >>> 91% Radiant energy waves are: - CORRECT ANSWER >>> All of the above In a speed test, a car traveling at 40 km/h increases its velocity uniformly for 4 seconds, while traveling the controlled distance of 100 m. Its acceleration in m/s² is: **- CORRECT ANSWER
** 6.945 m/s² The kinetic energy of a 1000 kg automobile travelling at 60 km/h is: **- CORRECT ANSWER ** 138.8 kJ MgSO4 + Ca(OH)2 - > In a balanced equation for this reaction, the product side be shown as: - CORRECT ANSWER >>> Mg(OH)2 + CaSO In the following right triangle, find the length of side c, if a = 2 m and b = 6 m. https://ibb.co/bmHC2rR - CORRECT ANSWER >>> 6.325 m A butane molecule is a straight chain hydrocarbon molecule with the following chemical formula: - CORRECT ANSWER >>> C4H In the following triangle, what is the value of sin B and what is the size of the angle B? - CORRECT ANSWER >>> 0.6, 36,87 degrees The first layer of an absorbed film type of corrosion inhibitor is: **- CORRECT ANSWER ** Strongly bonded to the metal surface
In a neutral atom the number of protons equals the number of: **- CORRECT ANSWER
** Electrons, therefore the electrical charge within the atom is balanced An octagon is machined from a circle having a diameter of 8 cm. How much area needs to be removed from the circle? https://ibb.co/2yB5vg4 - CORRECT ANSWER >>> 5.012 cm² A rope block hangs from a beam. The rope is passing around two sheaves (sheave = wheel or disk with a grooved rim, especially one used as a pulley) in each block as illustrated below. Find the mass that can be lifted with an effort of 40 N. https://ibb.co/9bxRzF8 **- CORRECT ANSWER ** 16.30 kg Cast iron contains ________ percent carbon. - CORRECT ANSWER >>> 2 - 4% Using the formulas, F = (9/5)C + 32 and K = C + 273, convert 68o - CORRECT ANSWER >>> 293 K. One of the laws of indices states: - CORRECT ANSWER >>> To raise a power to a higher power, multiply the indices. Critical pressure, critical temperature and critical volume are the terms given to those points in the state of a substance at which: - CORRECT ANSWER >>> Liquid and vapor have identical properties What is 'ln N' if log N = 3.825 - CORRECT ANSWER >>> 8. Balance the following chemical equation for the combustion of cetane. C16H34 + O2 - > CO2 +
H2O + Heat - CORRECT ANSWER >>> 2C16H34 + 49O2 - > 32CO2 + 34H2O + Heat
________ metals do not have iron as their main constituent. **- CORRECT ANSWER
** Nonferrous Find the characteristic constant for a gas if 112 kg of the gas has a volume of 5.7 m³ at 1500 kPa absolute and 27.5°C. - CORRECT ANSWER >>> 0.254 kJ/kg K Average velocity is determined by: - CORRECT ANSWER >>> V(ave) = (u + v)/ The heat required to change a unit of mass of a liquid to the vapor phase without change in temperature is called the latent heat of: - CORRECT ANSWER >>> Evaporation The work required to move a mass of 20 kg up a vertical distance of 10 m in one minute is: **- ** 16.30 kg Cast iron contains ________ percent carbon. - CORRECT ANSWER >>> 2 - 4% Using the formulas, F = (9/5)C + 32 and K = C + 273, convert 68o - CORRECT ANSWER >>> 293 K. One of the laws of indices states: - CORRECT ANSWER >>> To raise a power to a higher power, multiply the indices. Critical pressure, critical temperature and critical volume are the terms given to those points in the state of a substance at which: - CORRECT ANSWER >>> Liquid and vapor have identical properties What is 'ln N' if log N = 3.825 - CORRECT ANSWER >>> 8. Balance the following chemical equation for the combustion of cetane. C16H34 + O2 - > CO2 + H2O + Heat - CORRECT ANSWER >>> 2C16H34 + 49O2 - > 32CO2 + 34H2O + Heat ________ metals do not have iron as their main constituent. - CORRECT ANSWER >>> Nonferrous Find the characteristic constant for a gas if 112 kg of the gas has a volume of 5.7 m³ at 1500 kPa absolute and 27.5°C. - CORRECT ANSWER >>> 0.254 kJ/kg K Average velocity is determined by: - CORRECT ANSWER >>> V(ave) = (u + v)/ The heat required to change a unit of mass of a liquid to the vapor phase without change in temperature is called the latent heat of: - CORRECT ANSWER >>> Evaporation The work required to move a mass of 20 kg up a vertical distance of 10 m in one minute is: - CORRECT ANSWER >>> 1962 J Specific weight is - CORRECT ANSWER >>> A term used in the Imperial System only In the formula H2 there are two: - CORRECT ANSWER >>> Atoms of hydrogen A kilomol of a substance is an amount equal to its _____ in kilograms. **- CORRECT ANSWER ** Molecular mass If we find the maximum load applied to a sample being subjected to an ultimate tensile strength test, and know the cross-sectional area of the sample prior to testing, we can calculate the ultimate tensile strength of the sample by: - CORRECT ANSWER >>> Dividing the original cross- sectional area into the maximum load applied Any substance that cannot be broken down into simpler form by chemical means is a/an: - CORRECT ANSWER >>> Element
Compounds that are classified as acids have which of the following characteristics?
- They have a soapy feeling
- They have a sour taste
- They change blue litmus paper red
- They will conduct electricity - CORRECT ANSWER >>> 2, 3, 4 The power required to drive a pump which has an output of 15 kW and an efficiency of 90% is: - CORRECT ANSWER >>> 16.67 kW Oxygen is lanced into the molten metal in the Electric Arc Furnace to:
- Increase the heat and promote faster melting of the pig iron
- Form oxides that float to the surface
- Lower the carbon content to the desired levels
- Enhance the electrical current flow - CORRECT ANSWER >>> 2, 3 Each circular half of the figure-8 race track shown here has an outside radius of 145 m. Calculate the minimum size, in hectares, of the rectangular lot that can contain this race track. https://ibb.co/bWK09Nk - CORRECT ANSWER >>> 16.82 ha A flywheel changes speed uniformly from 400 rpm to 100 rpm in 1 minute. What is the angular retardation of the flywheel in rad/s²? - CORRECT ANSWER >>> 0.523 rad/s² In chemistry, bases are also called: - CORRECT ANSWER >>> Alkalines Work done in a cylinder at constant pressure can be defined using the formulas:
- Work Done (J) = Pressure (kPa) x Area (m²)
- Work Done (J) = Pressure (kPa) x Area (m²) x Distance (m)
- Work Done (J) = Force (N) x Area (m²)
- Work Done (J) = Force (N) x Distance (m) the force moves - CORRECT ANSWER >>> 2, 4 A sliding face of a slide valve of a steam engine is 150 mm by 300 mm, and the steam pressure on the back of the valve is 1200 kN/m². If the coefficient of friction is 0.02, what is the force required to move the valve? - CORRECT ANSWER >>> 1080 N The unit of relative density is: - CORRECT ANSWER >>> None How many kJ of heat is required to produce 32 kg of steam 88% dry at 3000 kPa from feedwater at 90°C? - CORRECT ANSWER >>> 70774.9 kJ The information boxes at the bottom of a Construction Drawing give exact details about:
- Parts of the equipment
- Operating parameters
- Connections to the equipment
- Direction of flow of the fluids through the equipment
- The composition of the fluids flowing through the equipment
- Auxiliary piping requirements - CORRECT ANSWER >>> 1, 3, 6 Aqueous solutions of acids have the following characteristics:
- They have a value between 0 - 7 on the pH scale
- They have a value between 7 - 14 on the pH scale
- They change the color of litmus paper from red to blue
- They change the color of litmus paper from blue to red
- Brinell test - CORRECT ANSWER >>> 2, 3 Boyle's Law is one of constant: - CORRECT ANSWER >>> Temperature From the Superheat Tables the symbol "v" means the specific: - CORRECT ANSWER >>> Volume of the steam A Brinell hardness number of "65 HB 10/500/25" means: - CORRECT ANSWER >>> That a Brinell hardness of 65 was obtained using a 10 mm diameter hardened steel ball with a 500 kg load applied for a period of 25 seconds
