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4th Class ABSA Exam Part A Practice Questions And Answers Solved 100% Correct!!

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4th Class ABSA Exam Part A Practice Questions And Answers Solved 100% Correct!! Absolute pressure is: gauge pressure plus atmospheric pressure The motion of moving parts is _____ by friction: A: Prevented B: Improved C: controlled D: resisted E: Regulated D: resisted Voltage is a) the rate of current flow b) the rate of electron flow c) electromotive force d) Kinetic energy e) A form of power c) electromotive force The resistance of a conductor is affected by: 1. Cross section area 2. Length 3. Temperature 4. Type of material a) 1,2,3 b) 1,2,4 c) 1,3 d) 1,2,3,4 e) 1,2 d) 1,2,3,4 The movement of electrons in a conductor can be measured in: a) Amperes b) Ohms c) Volts d) Watts e) Micrometer a) Amperes An electric motor has a 3/4 horse power output rating. Calculate the rating in kilowatts: a) 0.56 b) 0.75 c) 0.70 d) 7.5 e) 1.005 a) 0.56 The connection provided on DC motors to supply the armature with power: a) are slip rings b) are field poses c) is a rheostat d) commutator e) is a rotating conductor d) commutator The unit for the oppostion to current flow is the: a) volt b) amperes c) ohm d) watt e) resistance c) ohm In an electric circuit protected by a single fuse the current flowing through the fuse must be: a) Equal to the voltage in the circuit b) Equal to the resistance in the circuit c) All of the current in the circuit d) Equal to the rated value of the fuse e) 1.732 times the applied current d) Equal to the rated value of the fuse Electric overloads may be due to 1. Applying too heavy load to an electric motor 2. Lightning strike 3. A short circuit 4. Overloading a circuit with too many devices 5. Addition of circuit breakers a) 1,2,3,4 b) 1,3,4,5 c) 1,2,5 d) 2,3,4 e) 1,3,5 a) 1,2,3,4 Since the discovery of electrons, it has been determined that electrons are a negative charge and flow from: Select one: a. positive to negative b. north to south c. south to north d. a lower potential to a higher potential e. a higher potential to a lower potential d The yoke that supports the main components of the DC machine is frequently made of: a) Copper or brass b) Mica and carbon c) Copper and carbon d) Cast steel or iron e) Stainless steel d Electrical current flow through a conductor is caused by the drift of: a) Photons b) Neutrons c) Electrons d) Proteins e) Protons c A device used to change the voltage and current from one level to another is known as: a) Conductor b) Resistor c) Alternator d) Transformer e) Shunt d Three resistances of 4, 8, 12, Ohms are connected in parallel in a DC circuit. The total resistance in the circuit will be: a) 24 ohms b) 12 ohms c) 0.58 ohms d) 0.46 ohms e) 2.18 ohms e A thermocouple consists of: Select one: a. A filament that is compared to the object being measured b. Two dissimilar wires connected together c. Two dissimilar wires connected to a battery d. Two similar wires separated by another metal e. Two dissimilar wires connected to a computer b The electrical resistance of the conductor on a strain gauge will increase when a tensile force is applied because the wire grid of the strain gauge will: a) Decrease in length and cross-sectional area b) Increase in length and cross-sectional area c) Decrease in length d) Increase in length and decrease in cross-sectional area e) Decrease in cross-sectional area d Modulating combustion controls: a) regulate the steam and feedwater supply b) Regulate the fuel and air supply c) Control the oil atomizer d) Control the back draft damper e) Modulate the water supply proportional to the air supply b A pyrometer is used to measure: a) specific gravity b) Temperature c) Viscosity d) The composition of flue gases e) sensible heat b Which of the following controls would you expect to find on a hot water control? 1. Low water fuel cut-off 2. Operating temperature control 3. High limit pressure control 4. High limit temperature control a) 1, 2, 4 b) 2, 3, 4 c) 1, 2, 3 d) 1, 3, 4 e) 3, 4 a ASME Section IV requires that hot water heating boilers must be equipped with a a) thermometer b) fusible plug c) return trap d) hartford loop e) stop and check valve a When air is heated without changing the moisture content which type of heat is added? a) sensible heat b) latent heat c) effective heat d) relative heat e) measurable heat a The amount of water vapour air can hold depends on which of the following: a) humidity b) dew point c) temperature d) volume e) all of the above c What is the percent by volume of methane in natural gas? a) 15% b) 25% c) 50% d) 95% e) 100% d Very large steam boiler uses a) induced draft b) forced draft c) balanced draft d) natural draft c Balanced draft a) means furnace pressure is maintained at some desired value b) means air flow is always constant c) requires an FD and ID fan, never just an FD fan d) can be accomplished with just a chimney e) means air and fuel quantities are the same per unit time a A way of increasing natural draft is to a) incorporate a forced draft fan b) have the outside air temperature increase c) install an induced draft fan d) increase stack height e) decrease the amount of excess air d Watertube boilers are better suited to higher pressures than firetube boilers, because they: 1. incorporate a bent tube design 2. are larger than firetube boilers 3. do not have flat surfaces subjected to pressure 4. usually have smaller diameter tubes 5. have smaller diameter drums a) 1, 2 b) 1, 3, 5 c) 2, 3, 5 d) 1, 2, 5 e) 1, 3, 4, 5 e A firetube boiler is one which has a) water on the inside of the tubes and the hot gas of combustion on the outside. b) the furnace as the first pass of the burner flame. c) water on the outside of the tubes and hot water on the inside of the tubes. d) water on the outside of the tubes and the hot gas on the inside of the tubes. e) internally fired tubes surrounded by water d Advantage of firetube, watertube, and electric boilers What is a packaged boiler? What happens to a wires resistance when it is stretched? Lowest boiling point of water is at? a) 3000m above the sea level b) Just below sea level c) at 1000m above sea level d) at 101.3kPa Method of Sulphur dioxide removal - Non regenerable and regenerable Flue gas cleaning question - Answer was lime or limestone and diluted sulphuric acid is used to clean flue gas SO2 What is ratio of load to effort called? Power definition? the rate at which work is done Cylinder foot ring used for what? Definition of velocity the speed of something in a given direction. Best way to dispose off hazardous liquid is to Natural refrigerant that replaces CFC's What is a fuse: Inductor, Inducer, Resistor or Capacitor? Efficiency of an electrostatic precipitator: 10%, 50% 90% 99% 99 Type of a weld on a dished head to shell? fillet How do we separate oil from water? coagulation centrifugal separation neutralization incineration Centrifugal Separation Why do we use expansion bends in a pipe? What type of heat transfer produces heat outside of a pipe (pipe surface)- (conduction, radiation, convection). A cold pipe becomes hot from condensate. This is based on what? Why is an electrode coated in arc welding process? Bourdon tube rotational degree? 270 degrees Corrosive fluid piping color coding? Linear expansion definition? Proportional and reset action Double seated valve Advantage of water cooled furnace What is electromotive force? This is really just the effect of electric potential difference or the tendency for a positive charge to travel from high electric potential to lower potential. Define all metal properties (hardness, brittelness, elasticity, etc.) Sulphur dioxide component if it is atom, mole or molecule? Purpose of a gasket Make up small imperfections in a flange Plastic foam insulation used in ________ services ; High temp, Low temp, Refrigeration, High pressure Aluminum is made from what? Bauxite Most common material used for pipe fittings in a plant? TAP plugs? Tapered plug valves Shutoff valve between check valve and the boiler Circular piping weld supports Newton's Laws of Motion INCLUDES 3 LAWS. 1. AN OBJECT AT REST WILL REMAIN AT REST UNLESS ACTED UPON BY AN (UNBALANCED) FORCE, AND AN OBJECT IN MOTION WILL CONTINUE TO STAY IN MOTION WITH THE SAME SPEED AND IN THE SAME DIRECTION UNLESS ACTED UPON BY AN (UNBALANCED) OUTSIDE FORCE. (THIS LAW IS ALSO CALLED "INERTIA") 2. ACCELERATION IS PRODUCED WHEN A FORCE ACTS ON MASS AND THE GREATER THE MASS OF THE OBJECT BEING ACCELERATED, THE GREATER THE AMOUNT OF FORCE NEEDED TO ACCELERATE THAT OBJECT. 3. FOR EVERY ACTION, THERE IS AN EQUAL AND OPPOSITE REACTION. second law of thermodynamics What thread does a pipe tap make? female connection? 70% of ash content fuel for FBC Absolute pressure calculation Why is bourdon tube not used for low pressure or vacuum, stiffness of material Difference between flow nozzle and Venturi tube Variable area meter 3rd class power engineer can take charge of what HEATING PLANT a) ALL b) 1000kW c) 15000kW d) 10000kW 5th class power engineer can work as shift engineer in a power plant rated at what capacity a) 500kW b) 1000kW c) 5000kW d) 10000kw What is the enthalpy of 1kg of saturated water at 200kPa How do you tighten a flange - Cross sectional (star pattern) Superheater PRV discharge capacity a) 50% b) 65% c) 75% d) 85% Chemical composition of SO2

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