442A Practice Exam 1 PDF

# Industrial Electrician Interprovincial (Red Seal) Review Exam ## Question 1. How must an ammeter be connected when it is to be used to measure the current through a device? * It must be connected in **series** with the device. * It must be connected in **parallel** with the device. * It mus...

# Industrial Electrician Interprovincial (Red Seal) Review Exam ## Question 1. How must an ammeter be connected when it is to be used to measure the current through a device? * It must be connected in **series** with the device. * It must be connected in **parallel** with the device. * It must be connected across L1 and L2. ## Question 2. With scaffolds, the employer must ensure that the planks are ______ inches thick. * 3 * 2 * 1 * 1.5 ## Question 3. What is the amount of current that can cause severe burns and severe muscular contraction? * Over 200 mA * 100-200 mA * 20 - 75 mA * 8 - 15 mA ## Question 4. When using the Explosive Actuated Tool process on steel, a general recommendation is to drive the fasteners no closer than ____ mm from a weld. * 75 * 60 * 50 * 15 ## Question 5. With freestanding or rolling scaffolds, where outriggers are used to attain a ____ to one ratio, they must be firmly attached. * 5 * 4 * 3 * 2 ## Question 6. Work on live electrical apparatus is allowed under what conditions? * If the voltage is 240 or less. * When leather clothes are worn. * If approved protective equipment is in place. * When conductive mats are in place on the floor. ## Question 7. Oil analysis is a key part in the Condition Monitoring of equipment. * True * False ## Question 8. Stainless steel Explosive Actuated Tool pins should not be used in highly corrosive environments. * True * False ## Question 9. The term _______ refers to saving information from the web to a computer. * Uploading * Writing ## Question 10. What type is a medium duty ladder? * 3 * 2 * 1 * IA ## Question 11. Data from vibrational analysis can be used to predict component failure. * True * False ## Question 12. The above symbol indicates a/an: * Filter. * Cooler. * Filter with water trap. * Water trap. ## Question 13. Which of the following Explosive actuated tools can be used without a guard? * High velocity * Low velocity ## Question 14. Three coils with an impedance of 12 ohms and a power factor of 0.667 are connected in delta to a 480 Volt supply. What is the total power if three single-phase wattmeters are used to measure the power? * 38.4 kW * 64.5 kW * 19.3 kW * 86.2 kW ## Question 15. What happens when a coil in a relay is de-energized? * The magnetic field expands. * The magnetic field collapses. * The spring pushes the plunger in. * Retentivity of the coil goes up. ## Question 16. A three-phase wye connected system may be balanced even if the circuit power factor is not unity. * True * False ## Question 17. What is a location where corrosive liquids or vapors are likely to be present which are liable to interfere with the normal operation of electrical equipment? * Category 1 * Category 2 * Zone 1 * Division 2 ## Question 18. What is a benchmark when referring to a construction blueprint? * A designated point of elevation used as a reference for all other installation elevations. * A designated point of elevation used only as a reference for rafter installation. * A designated portion of a print listing construction material. * A designated portion of a print making reference to local code rules. ## Question 19. What type of diagram best shows equipment components in their actual physical arrangement? * The block diagram * The schematic diagram * The wiring diagram * The interconnection diagram ## Question 20. A load is connected in wye. Which one of the following statements is true? * The phase voltage lags the line voltage by 30 degrees. * The line voltage leads the phase voltage by 120 degrees. * The phase voltage leads the line voltage by 30 degrees. * The phase voltage lags the line voltage by 120 degrees. ## Question 21. What does laminating the armature and core of an AC relay help to reduce? * It reduces eddy current losses. * It reduces hysteresis losses. * It reduces the weight of the core. * It reduces chattering. ## Question 22. Sensing the value of current going to a motor is accomplished by the use of two basic methods of overload protection. What are these methods? * These methods are the bi-metal and thermal. * These methods are the thermal and electromagnetic. * These methods are the solder pot and thermal. * These methods are the dashpot and electromagnetic. ## Question 23. A 368 microfarad capacitor, a 25 Amp single-phase motor with a power factor of 0.9 and a 30 Amp single-phase motor with a power factor of 0.8 are connected in parallel to a 208 Volt 60 Hz supply. What is the line current of the circuit? * The line current of the circuit is 25.6 Amps. * The line current of the circuit is 28.9 Amps. * The line current of the circuit is 46.5 Amps. * The line current of the circuit is 54.9 Amps. ## Question 24. If the value of capacitance in a circuit is increased, then what will happen to the amount of capacitive reactance in the circuit? * The capacitive reactance in the circuit will increase. * The capacitive reactance in the circuit will decrease. * The capacitive reactance in the circuit will stay the same. * The capacitive reactance in the circuit will double. ## Question 25. What do wiring diagrams present? * Blocks of information connected to each other. * Electrical interconnection of the components and physical location. * A ladder description of an electrical operation. * Specifications of equipment and ratings. ## Question 26. Which of the above schematics is most suited for an automatic control of an air compressor? * Diagram D * Diagram C * Diagram B * Diagram A ## Question 27. What table is used to classify compressed natural gas fueling stations? * Table 63 * Table 64 * Table 69 * Table 70 ## Question 28. Three coils with an impedance of 12 ohms and a power factor of 0.667 are connected in wye to a 480 Volt supply. What will each wattmeter indicate if three single-phase wattmeters are used to measure the power? * Each wattmeter will indicate 12 810 W. * Each wattmeter will indicate 8 400 W. * Each wattmeter will indicate 6 400 W. * Each wattmeter will indicate 4 270 W. ## Question 29. Which of the following statements is correct for a balanced delta-connected load with a power factor of 0.766 lag? * In this circuit the line current lags phase voltage by 40 degrees. * In this circuit the line current lags line voltage by 10 degrees. * In this circuit the phase current lags the line voltage by 70 degrees. * In this circuit the phase current lags phase voltage by 40 degrees. ## Question 30. Three resistors are connected in a wye configuration. Each resistor has 10 Amps of current flowing through it. What is the value of the line current? * 17.3 Amps * 5.77 Amps * 30 Amps * 10 Amps ## Question 31. When capacitors are used for power factor correction in a three-phase circuit, what are the voltage rating of the capacitors required to be? * The voltage ratings are required to be 1.732 times more for a delta than a wye connection. * The voltage ratings are required to be 1.732 times less for a delta than a wye connection. * The voltage ratings are required to be 3 times more for a delta than a wye connection. * The voltage ratings are required to be 3 times less for a delta than a wye connection. ## Question 32. High voltage type TC cables shall not be installed in the same cable tray with low voltage conductors, except where the high voltage TC cables are separated from the low voltage conductors by a barrier of sheet metal not less than how many mm thick? * 2.34 * 1.39 * 1.34 * 0.88 ## Question 33. An impedance voltage of 15 Volts is obtained by a short-circuit test on a 480/240 Volt single-phase transformer. What is the percent impedance of the transformer? * The percent impedance of this transformer is 0.031%. * The percent impedance of this transformer is 2.5%. * The percent impedance of this transformer is 3.1%. * The percent impedance of this transformer is 31%. ## Question 34. A set of three dielectric filled capacitors with a volume of 5 liters oil in each tank is to be installed along a wall next to another set of three dielectric filled capacitors with a volume of 15 liters of oil in each tank. How close together can the two sets of capacitors be situated? * 2.41 m * 14.6 m * 3.3 m * 2.6 m ## Question 35. A balanced three-phase load and a balanced single-phase load (both are at unity) are supplied from a four-wire delta system. What would the line currents be? * The line currents would be three times the single-phase current. * The line currents would be unbalanced. * The line currents would be the difference between the three-phase current and the single-phase current. * The line currents would be balanced. ## Question 36. What is a network system also referred to as? * A ring system. * A digital flow. * A gradient. * A radial map. ## Question 37. What is the series-winding current in a step-down autotransformer the same as? * It is the same as the primary current. * It is the same as the secondary current. * It is the same as the common-winding current. * It is the same as the no-load current. ## Question 38. What is the maximum rating of fuse allowed on a potential transformer? * 3 Amps under 750 Volts. * 3 Amps over 750 Volts. * 10 Amps over 750 Volts. * 125% of the primary current of the transformer. ## Question 39. A set of three dielectric filled capacitors with a volume of 20 liters oil in each tank is to be installed along a wall next to another set of three dielectric filled capacitors with a volume of 15 liters of oil in each tank. How close together can the two sets of capacitors be situated? * 1.5 m * 14.6 m * 3.3 m * 2.6 m ## Question 40. What is the distance, in meters, or vertical isolation required, for a 27 kV high voltage line in an area likely to be traveled on by vehicles? * 8.1 * 6.6 * 5.2 * 4.7 ## Question 41. The following three-phase motors are connected to a common copper feeder conductor: 42 Amp FLC full voltage start continuous duty squirrel cage motor 62 Amp FLC full voltage start continuous duty squirrel cage motor 45 Amp FLC full voltage start intermittent duty 5 min rating squirrel cage motor 82 Amp FLC full voltage start intermittent duty 5 min rating squirrel cage motor What is the calculated ampacity of a copper feeder conductor for the motor bank? * 221 Amps * 227 Amps * 246 Amps * 301 Amps ## Question 42. Which circuit is the magnetization current of a transformer a component of? * The magnetization current of a transformer is a component of the load circuit. * The magnetization current of a transformer is a component of the supply circuit. * The magnetization current of a transformer is a component of the control circuit. * The magnetization current of a transformer is a component of the exciting current. ## Question 43. A bank of three 10 kVA 480-120/240 Volt single-phase transformers is connected in a wye-wye configuration to supply a 120/208 Volt three-phase load. What is the rated primary phase current? * The rated primary phase current is 8.33 Amps. * The rated primary phase current is 20.8 Amps. * The rated primary phase current is 36.1 Amps. * The rated primary phase current is 62.5 Amps. ## Question 44. What kind of device is a transformer? * A transformer is a dc device. * A transformer is an electrostatic device. * A transformer is an ac device. * A transformer is an electrochemical device. ## Question 45. What are the two components of core losses of a transformer? * The two components are copper losses and iron losses. * The two components are copper losses and line losses. * The two components are hysteresis losses and eddy current losses. * The two components are dielectric losses and copper losses ## Question 46. Which meter base has a "tickler" wire? * The three-wire network meter base has a "tickler" wire. * The four-wire delta meter base has a "tickler" wire. * The four-wire wye meter base has a "tickler" wire. * The three-wire single-phase meter base has a "tickler" wire. ## Question 47. In an open-delta/open-delta three-phase transformer bank connection, what is the phase voltage? * The phase voltage is impossible to calculate. * The phase voltage is the same as the line voltage. * The phase voltage is the same as primary line current. * The phase voltage is 1.732 times the line voltage. ## Question 48. What is a time delay fuse primarily designed to protect? * Circuits supplied by a delta system. * Circuits supplied by a wye system. * Motor circuits. * AFCI circuits. ## Question 49. When the secondaries of a wye-delta bank are connected in delta, what type of loads can be connected to it? * The lads connected to it must also be connected in delta. * The loads connected to it must be connected in wye only. * The loads connected to it can be either wye or delta. * No loads can be connected to that configuration. ## Question 50. When viewed from opposite the shaft end of a motor, what is the NEMA standard rotation for a motor with an ABC phase sequence? * It is a counter clockwise rotation. * It is a clockwise rotation. ## Question 51. A DC compound motor under no load condition suddenly has an open in its shunt field. What does this cause? * An open in the shunt field will cause no change. * An open in the shunt field will cause the motor speed to decrease. * An open in the shunt field will cause the motor to stop completely. * An open in the shunt field will cause the motor speed to increase to extreme level. ## Question 52. As a DC generator coil moves through a magnetic field, it is important that any given coil is periodically shorted out by the brushes. When should this happen? * It should happen when the coil is moving through the interpoles. * It should happen when the coil is moving through the main poles. * It should happen when the coil is moving perpendicular to the field. * It should happen when the coil is moving parallel to the field. ## Question 53. A six-pole 60 Hz SCIM has a 2.5% slip at full-load. What is the full-load speed of the motor? * The full-load speed of the motor is 1 800 RPM. * The full-load speed of the motor is 1 764 RPM. * The full-load speed of the motor is 1 200 RPM. * The full-load speed of the motor is 1 170 RPM. ## Question 54. Two alternators are synchronized and supplying power to a load. It is desired to increase the voltage only going to the load. What must you do to accomplish this? * You must increase the field excitation of one alternator while decreasing the other. * You must increase the power input to one alternator while decreasing the other. * You must increase the power input to both alternators at the same time. * You must increase the field excitation to both alternators at the same time. ## Question 55. What is a phase converter used for? * A phase converter is used to produce three-phase power from a single-phase source. * A phase converter is used to three-phase power from a dc source. * A phase converter is used to step up the voltage to an acceptable value. * A phase converter is used to converts dc to ac. ## Question 56. As load is added to a synchronous motor, the armature current will increase. What happens to the torque angle? * The torque angle will decrease. * The torque angle will increase. * The torque angle will stay the same. * The torque angle will become unity. ## Question 57. Why are AC alternators constructed with moving fields? * They are constructed that way because the fields are physically smaller than armatures. * They are constructed that way because the cooling systems are simpler. * They are constructed that way because the slip rings are fewer and smaller. * They are constructed that way for all of the above reasons. ## Question 58. A 30-pole synchronous motor is connected to a 60 HZ supply. The rotational frequency of the field will be how many r/min? * The rotational frequency of the field will be 480 r/min. * The rotational frequency of the field will be 240 r/min. * The rotational frequency of the field will be 200 r/min. * The rotational frequency of the field will be 180 r/min. ## Question 59. What are a DC generator series winding made of? * They are made of few turns and a small cross-sectional area. * They are made of many turns and a small cross-sectional area. * They are made of many turns and a large cross-sectional area. * They are made of few turns and a large cross-sectional area. ## Question 60. What is the most common reason for open windings in a single-phase motor? * The most common reason is loose connection. * The most common reason is overheating of the motor. * The most common reason is low voltage. * The most common reason is malfunction of centrifugal switch. ## Question 61. A 60 HZ, six pole, 1140 r/min split phase motor should have its centrifugal switch open at approximately how many r/min? * It should open at approximately 1200 r/min. * It should open at approximately 1130 r/min. * It should open at approximately 855 r/min. * It should open at approximately 600 r/min. ## Question 62. A three-phase synchronous motor is operating at a steady load. Operating at this load, its torque angle will never be at what angle? * It will never be at 0 degrees. * It will never be at 15 degrees. * It will never be at 45 degrees. * It will never be at 60 degrees. ## Question 63. What is the generated voltage in a DC generator proportional to? * The generated voltage is proportional to load voltage. * The generated voltage is proportional to load current. * The generated voltage is proportional to field flux density. * The generated voltage is proportional to the amount of field current. ## Question 64. Why is external resistance added to a WRIM during starting? * Resistance is added to increase the starting voltage. * Resistance is added to decrease the starting voltage. * Resistance is added to decrease the starting current. * Resistance is added to increase the starting current. ## Question 65. How do the starting torque of a single-phase split phase motor and a single-phase capacitor start motor compare for the same HP motor? * The starting torque will be the same. * The single-phase split phase motor will have a slightly higher starting torque. * The single-phase capacitor start motor will have a higher starting torque. ## Question 66. Which of the following is a correct statement? * The starting current to a motor is reduced in proportion to the reduction in starting voltage. * All motor starters reduce the voltage to motor at start-up. * Reduced voltage motor starters can be used with type of motor. * The starting voltage to a motor is based on the horsepower rating of the motor. ## Question 67. As load is applied to a synchronous motor, the angle between the center of the rotating magnetic pole on the stator and the center of the rotor pole will increase. What is this angle referred to as? * This angle is referred to as the displacement angle. * This angle is referred to as the power factor angle. * This angle is referred to as the torque angle. * This angle is referred to as the slip angle. ## Question 68. A 40 kW, 240 Volt long-shunt DC generator is operating at rated load. The series field has a resistance of 0.1 ohms and the shunt field has a resistance of 100 ohms. What would the voltage measured at the brushes of the generator be? * The voltage measured at the brushes of the generator would be 223.1 Volts. * The voltage measured at the brushes of the generator would be 240.0 Volts. * The voltage measured at the brushes of the generator would be 256.9 Volts. * The voltage measured at the brushes of the generator would be 265.9 Volts. ## Question 69. As load is increased on a separately-excited DC generator, why does the terminal voltage tend to decrease? * It decreases due to armature reaction and decreased voltage across field winding. * It decreases due to armature reaction and armature winding IR drop. * It decreases due to armature reaction and shifting of the neutral plane. * It decreases due to armature reaction and motor action. ## Question 70. What is the best motor starting method in terms of reducing the starting current while maintaining starting torque? * The best starting method would be the wound rotor starting. * The best starting method would be the autotransformer starting. * The best starting method would be the wye-delta starting. * The best starting method would be the part-winding starting. ## Question 71. The frequency of the output voltage from an inverter is limited to twice the frequency of the input voltage. * True * False ## Question 72. A squirrel cage induction motor will have slip rings on the rotor. * True * False ## Question 73. How fast in an IGBT is capable of switching? * It will switch in approximately 400-500 milliseconds. * It will switch in approximately 400-500 microseconds. * It will switch in approximately 400-500 nanoseconds. * It will switch in approximately 400-500 picoseconds. ## Question 74. The PWM type of VFD is the most common in industry? * True * False ## Question 75. A UPS unit has an input rating of 25 kVA three-phase 60Hz 120/208 Volt. What is the number of bus bars connecting the dc link from the rectifier to the inverter? * There is one bus bar connecting it. * There are two bus bars connecting it. * There are three bus bars connecting it. * There are four bus bars connecting it. ## Question 76. A PWM inverter has an output voltage of 340 Volts. What is average voltage of a pulse which is on for 4 micro-seconds out of a 15 micro-second time frame? * 340 Volts * 120 Volts * 170 Volts * 90. 7 Volts ## Question 77. What type of detector is most sensitive to smoldering fires? * Photoelectric * Magnetic * Ionization * Optic ## Question 78. What is the bandwidth requirements for residential land line telephones? (in kHz) * 22 * 12 * 7 * 3 ## Question 79. On what circuit would a smoke alarm in a house typically be connected to? * It would typically be connected to its own separate circuit. * It would typically be connected to the microwave circuit. * It would typically be connected to the ground fault circuit. * It would typically be connected to an adjacent lighting circuit. ## Question 80. Where does a Security System Central Processing Unit normally receive its electrical power? * From a dc supply. * From an ac supply. ## Question 81. Why are door mounted magnetic reed switches popular? * They require no wires. * They are inexpensive to buy. * They can handle high ambient temperatures. * The sound amplification is excellent. ## Question 82. What is one condition of a fire alarm system? * It could be a supervisory condition. * It could be an open circuit condition. * It could be a dead device condition. ## Question 83. How is plugging of a three-phase motor accomplished? * It is accomplished by decreasing the voltage to the armature. * It is accomplished by energizing the motor in forward and reverse at the same time. * It is accomplished by allowing the motor to coast to a stopped position. * It is accomplished by momentarily energizing the motor in the reverse direction. ## Question 84. In a PLC, what performs the function of decision making and solving of the logic program? * The devices connected to the input modules. * The input and output modules. * The central processor unit. * The programmer. ## Question 85. What type of interface is needed to convert an industrial voltage to a DC voltage that is appropriate to communicate with the logic of a PLC? * An input interface is needed. * An output interface is needed. * A binary interface is needed. * A complex interface is needed. ## Question 86. What is used to connect two PLC systems together? * Nothing; special as they can just be hard wired together. * A communication highway is used. * A fibre optic connection is the only thing that can be used. * A cellular communication system is the only system that can connect them together. ## Question 87. What kind of changes are required to modify a systems operation without the use of a PLC? * Many control systems require very minor changes. * Many control systems require hard wiring changes. * Many control systems require software program changes. * Many control systems require higher voltage changes. ## Question 88. What function does the CPU of a PLC perform? * It performs the writing information to the input modules. * It performs the preventing overload conditions within the I/O modules. * It performs the supplying power to the I/O devices. * It performs the processing the information according to the status of the I/O devices and the user program. ## Question 89. When will the BLUE light turn ON? * The BLUE light will turn on immediately. * The BLUE light will turn on 15 seconds later. * The BLUE light will turn on 20 seconds later. * The BLUE light will turn on 35 seconds later. ## Question 90. What type of switch is used on an anti-plugging circuit for a three-phase motor? * A normally open switch is used. * A normally closed switch is used. * A time delay switch is used. * A current sensitive switch is used. ## Question 91. Seventy seconds after the start button in the above circuit is pressed, M1 overload contacts (3 0.L.) open. What does this cause? * It causes only M1 and TR1 to de-energize. * It causes only M2 and TR2 to de-energize. * It causes only M3 and TR3 to de-energize. * It causes everything to de-energize. ## Question 92. How is information to the controller of a PLC provided? * It is provided by the use of limit switches. * It is provided by the use of relay contacts. * It is provided by the use of discrete inputs. * It is provided by the use of all of the above. ## Question 93. The heat that is added or removed and creates a change to the state of a material is called ______ heat. * Comfortable * Sensible * Latent ## Question 94. What does the heat exchanger contain? * It contains the air filter. * It contains the blower motor. * It contains the clean air that is circulated by the blower. * It contains the exhaust gases from the burning fuel. ## Question 95. Heat that can be measured with a thermometer is known as ______ heat. * Comfortable * Sensible * Latent ## Question 96. A safety device such as a high-temperature limit switch must be wired as what type of circuit? * It must be wired as a power. * It must be wired as a class 1. * It must be wired as a class 2. * It must be wired as a class 2 signal. ## Question 97. What does a liquid bulb type temperature sensing device consist of? * It consists of a small metallic bellow filled with liquid or gas. * It consists of two dissimilar metals in disc shape. * It consists of two wires of dissimilar metals connected in series. * It consists of a rigid metallic bulb attached to one end of a thin tube and a flexible diaphragm attached to the other end. ## Question 98. What does a thermostat used for a furnace consists of? * It consists of a thermocouple and a gas valve. * It consists of a gas burner and a fan motor. * It consists of a pyrometer and a control transformer. * It consists of a temperature sensing device attached to a set of contacts. ## Question 99. When the refrigerant in a cooling system enters the compressor, it is a low-pressure refrigerant, what is it when it leaves the compressor? * It is a high-pressure cool refrigerant. * It is a high-pressure hot refrigerant. * It is a high-pressure warm refrigerant. * It is a low-pressure cool refrigerant. ## Question 100. When troubleshooting an HVAC rooftop unit, what is the most useful meter to an Electrician? * Wattmeter * Voltmeter * Oscilloscope * Ammeter