Transformers Test 1 Practice

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• How is non-PCB fluid indicated?
• As the load in a transformer increases, the heat _______________
• Which device is designed to prevent accidents by venting excess pressure in an oil-filled transformer?
• Transformers located at distribution substations and on distribution poles step voltage in which direction?
• ____________ losses are created by the oscillation of the magnetic field in respect to the core.
• Where are distribution transformers typically located?
• How many types of overhead transformers are there?
• In a subtractive polarity transformer, the x1 bushing is located on which side?
• Internal pressure buildup in a transformer can cause the lid to __________.
• Which mounting type is used for transformers mounted on utility poles?
• ____________ losses are caused when a current flows in a conductor.
• The construction of the core can significantly impact which parameter of a transformer?
• On a pad-mounted transformer, the secondary side is located on which side?
• For pad-mounted transformers, how are fuses operated?
• Transformers are made of three main components. Which trio lists them correctly?
• How many windings does a functional transformer require?
• CSP stand for:
• Why is AC predominate worldwide?
• Heat limits _______________
• A 150 kVA transformer with a primary rating of 9000 V would be additive or subtractive?
• Which term describes the comparison of the number of turns in the primary and secondary coils?
• A transformer operates with which type of current?
• In a CSP transformer, what happens when there is an overload on the secondary side?
• The process of converting voltage up or down is called
• Do the coils of wire in a transformer touch?
• Does a transformer have moving parts?
• Which arrangement is correct for a pad-mounted transformer?
• What is the most widely used apparatus in the electric utility industry?
• The core of a transformer is typically made of which material?
• Which material is the most popular for the windings?
• A pad-mounted transformer is placed on either a concrete or ______ pad.
• Which type of transformer is described as having an internal fuse?
• In distribution networks, transformers are commonly found in which mounting configurations?
• On a pad-mounted transformer, the primary side is located on which side?
• The valve will vent when the internal pressure reaches approximately _______ lbs psi?
• On an overhead transformer, which windings do the high voltage primary bushings connect to?
• The winding wire may either be round or in __________ form.
• Are Iron losses also known as no-load losses because they occur when the customer is disconnected from the transformer
• Which term describes heat loss due to the resistance of the transformer windings?
• Impedance is made up of resistance and ______________
• The source side of a transformer is known as _________
• The ends of the winding associated with the transformer are commonly labeled in which sequence?
• Which statement best describes the function of insulating fluid in relation to the core and coil assembly?
• The secondary voltage will be less than the primary voltage if there are __________ turns in the secondary coil than there are in the primary coil.
• Which statement describes not being one of the three main transformer components?
• The laminations used in the core are made of which material?
• Which device is used to energize or de-energize the transformer?
• Transformers directly out of the generating station step voltage in which direction?
• On an overhead transformer, what are the low voltage secondary bushings called?
• A large size home will draw how many watts at peak load?
• The component of impedance that arises from inductive reactance is called
• Where should you expect to find the transformer pressure-relief valve physically located?
• Which component plays a critical role in cooling and insulating the core and coil assembly?
• Pad-mounted transformers are placed on pads made of concrete or which material?
• The core concentrates the __________, which substantially improves its efficiency.
• A new type of steel called ______ has been utilized for transformer cores.
• Which component concentrates magnetic flux lines?
• An overhead transformer has __________ for its primary source of feed (energization).
• A coil of wire will become energized if placed in close proximity to another coil of wire attached to a source of AC power, this is known as
• The process by which energy is transferred between windings without a direct electrical connection is called what?
• What is the Turns ratio for 138000 (primary) and 19900 (secondary)?
• A ______ transformer needs an external protective fused device.
• Does a CSP transformer need to be de-energized to replace a fuse?
• What is the Turns ratio for 19900 (primary) and 120/240 (secondary)?
• The quantity calculated by dividing the primary voltage rating by the secondary voltage rating is called the
• A 15 kW transformer can deliver how many watts?
• H1 is always on the ________ as you face it
• If a transformer is rated at 15 kW, how many watts is that?
• Pad-mounted transformers have fuses that are located internally, but are operated ___________
• To bank or parallel transformers, their impedances must be within plus or minus ________% of each other
• The pressure in a transformer can build up and _____________.
• Being able to transform a voltage is not possible with which circuits?
• The side of a transformer that delivers power to customers is called the
• The CSP transformer has an internal circuit breaker and primary ________.
• If transformers are going to be banked, do they all have to be the same voltage rating?
• The low voltage secondary bushings on an overhead transformer are connected to which windings?
• Insulating oil is typically some form of ________.
• A core material used to reduce core losses is called what?
• The labeling of the secondary bushings changes based upon the __________
• The windings are brought out of the core and coil assembly and attached to __________.
• Which statement about secondary bushing labeling is true?
• A pad-mounted transformer's primary source of feed is an ____________.
• Why does pressure (in the form of gas) sometimes build up in a transformer?
• What causes transformers NOT to be 100% efficient
• Which external device do both conventional and CSP transformers have?
• What does kVA stand for?
• A 150 kVA transformer with a primary rating of 8000 V would be additive or subtractive?
• The winding conductors are coated with insulation to prevent the turns from __________.
• _____________ is the total opposition to current flow caused by the transformer
• Is it possible for a transformer to be built without an iron core?
• Using amorphous steel in transformer cores primarily reduces which losses?
• Which equipment is equipped with pressure release valves?
• What gives transformers the bulk of their weight?
• Given a 120 volt secondary output: At full load and 2% impedance, a transformer will supply _____ volts (x1 to neutral reading).
• Which shape option is mentioned as an alternative to round winding conductors?
• The load side/customer side of a transformer is known as _____________
• When coils are wrapped around an iron core, what increases?
• PCB stands for __________.
• The __________ is made of thin laminations of grain-oriented silicon steel rolled into layers, with each side coated with an insulation material.
• The two main losses of the transformer are called _______ and copper losses.
• What is the electrical device that converts voltage from high to low or low to high?
• Which statement is true about transformer insulation levels?
• What is the basic principle that allows a transformer to work
• A pole-mounted transformer is physically attached with bolts known as _________
• If the primary winding has 82.9 times more turns than the secondary, the turns ratio is approximately
• How does a short in the windings cause gas to form in transformer oil?
• The transformer core provides a path for the ____________ of the transformer windings.
• The insulating fluid transfers heat from the coil and core assembly to the tank or ________, where it will be dissipated to the outside atmosphere.
• The energy transfer between windings in a transformer occurs without direct electrical contact, via a magnetic field. This describes which principle?
• Which of the following is a type of overhead transformer mentioned in the material?
• What is the protective fused device for a conventional transformer called?
• If a transformer is described as pole-mounted, where is it typically located?
• Which voltage level has more insulation in transformers?
• Amorphous steel is utilized to further ______ within the core.
• A _______________ transformer has the x1 bushing on the left side
• Which unit is used to express the apparent power of a transformer?
• Under which condition is a transformer's rating additive?
• The secondary voltage will be more than the primary voltage if there are __________ turns in the secondary coil than there are in the primary coil.
• CSP transformers are equipped with an internal _______.
• Copper is the most popular material for the windings because of its low resistance and superb ______.
• Mineral oil is typically used as the base for insulating oil. Mineral oil belongs to which category?
• Induction will be maximized and higher voltages obtained when the two coils are placed around which component?
• ___________ is set during the manufacturing process and cannot be changed in the field
• Which transformer type is described as being internally protected by a current limiting fuse and a circuit breaker on the secondary side?
• The CSP also has an internal secondary breaker, which is intended to disconnect the ______________ in the event of an overload or short circuit on the secondary side
• Transformers ______ kVA and smaller, with a primary rating of 8600 volts and below, will be rated additive.
• Where is the pressure valve for a transformer located?
• The term PCB relates to a substance that can be part of an insulating fluid typically known as ________.
• Transformers are either pole-mounted or pad-mounted depending upon the ____.
• The x2 bushing is always the __________.
• Which of the following statements is true regarding labeling of non-PCB fluids?
• On an overhead transformer, what are the high voltage bushings on the primary side called?
• Which transformer type is described as having internal protection by a current limiting fuse and a circuit breaker that energizes the secondary side?
• The amount of induced voltage can be transformed by changing the number of turns of wire in which coil?
• Can the insulating oil be flammable?
• The bushing designated x2 is the __________ conductor.
• The heat from insulating fluid is dissipated to the outside atmosphere through which component?
• An average size home will draw how many watts at peak load?
• Which statement best defines turns ratio?
• If you increase the number of turns in the secondary coil, what happens to the output voltage?
• In an additive polarity transformer, the x1 bushing is located on which side?
• If the secondary has more turns than the primary, the secondary voltage will be __________ than the primary.
• Besides low resistance, what other property of copper contributes to its use in windings?
• A 400 kVA transformer with a primary rating of 8600 V will be additive or subtractive?
• Which polarity configuration is described as additive?
• Which statement best describes the role of the transformer core with respect to the windings?
• If a transformer has an impedance of 2%, this means that the secondary voltage will be limited by _____% when the transformer is at full load
• Are ALL transformers built with an iron core?
• Wound and Shell are the two types of ______
• When transformers are banked or paralleled, the impedances must be within plus or minus 10% of each other. What is the purpose of this requirement?
• Where is a CSP fuse normally replaced?
• Heat limiting current flow is also called ______
• Polarity is determined by the direction the __________ coil is wrapped in relation to the direction to the other coil
• _________ is the direction of current flow through the two coils
• The front face of a transformer typically displays the rating in which unit?
• When transformers are banked together, the bank's kVA rating equals which of the following?
• When banked transformers are used, the voltage rating across all units must be __________.
• Pad-mounted transformers are equipped with a _____________ for energizing and de-energizing the transformer
• What is used to alleviate the potential of accidents due to pressure in transformers?
• The transformer ______ is a key component that provides a path for the magnetic coupling of the two windings.
• Transformers 200 kVA and smaller, with a primary rating of ____ volts and below, will be rated additive.
• Are primary or secondary wire windings typically smaller?
• PCB has been determined to be ________.
• The secondary bushings on a pad-mounted transformer are called ________
• The primary bushings on a pad-mounted transformer are called ________
• As the core heats the oil, the oil ________.
• A _______________ transformer has the x1 bushing on the right side
• A kVA is also called which of the following?
• If the secondary has fewer turns than the primary, the secondary voltage will be __________ than the primary.
• Polarity is very important to know when banking and ______ transformers.
• A PCB-containing insulating fluid is commonly referred to by what name?
• Where is the kVA rating typically stenciled on a transformer?
• Which list correctly identifies the three main components of transformers?
• When the winding ends are brought out of the core they are labeled __________.
• The polarity of a transformer is either _____________ or subtractive
• Copper losses of a transformer are also called ______.
• The circulation of the oil by heat is called ________.
• Iron losses of a transformer are also called __________
• Copper losses are also called what type of losses?