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IP Electrical Exam – Electrical Trade
Certification – study material
It is used to allow the motor to come up to speed before changing to delta. - correct answer ✔✔Why would a timing relay be used in a wye/delta starter? The transformer primary and the fan control switch. - correct answer ✔✔Which devices are found in the 120 Volt circuit of a domestic furnace? It is located on the intake side of the fan. - correct answer ✔✔Where is the filter located? 35 - correct answer ✔✔In an average house, what percent of the air should be exchanged in an hour? can be rated and sized independently - correct answer ✔✔Control circuit wiring and power circuit wiring used in low voltage switching systems: They are found in restaurants, body shop paint booths, and parkades. - correct answer ✔✔In what applications are "Make-up air units" ideally found in? controlled by a switch near the entrance. Rule 26-356 - correct answer ✔✔Electrical equipment vaults must have adequate lighting: The insulation rating should be the same as the ungrounded conductors. Rule 4-016 - correct answer ✔✔What must happen when insulated neutrals conductors are used?
It would increase due to motor slowing down, CEMF decreasing, and less current limiting in Gen effect. - correct answer ✔✔As load on a DC motor is increased why would the armature current increase? It is known as a differential-compounded generator. - correct answer ✔✔What is a "constant-current" DC generator known as? hot surface igniter (symbol of it) - correct answer ✔✔In a HVAC unit, which component heats up to the combustion temperature of gas to provide ignition? They provide the sequential order of operation in its simplest form. - correct answer ✔✔Why are schematic diagrams are useful for troubleshooting furnaces? It is mounted indoors and absorbs heat from the blower air. - correct answer ✔✔Where is the evaporator coil of a cooling system mounted? 562500 cmils. - correct answer ✔✔What is the cross sectional area of a conductor that has a diameter of 0.75 of an inch? No. 14 AWG copper. Rule 22-104 - correct answer ✔✔Referring to Section 22, pendant lampholders must be of the weatherproof type and hung from insulated stranded conductors of not less than: 10.5 times the diameter of the cable for low voltage cable. (High volt is 18 times) Found in Rule 12-614 - correct answer ✔✔What is the minimum bending radii measured at the innermost surface of the conduit when armoured cables are installed in accordance with rule 12-602? There are third guardrail secured in place. - correct answer ✔✔When can an electrician carry out work on top of a scaffolding?
The ambient temperature. Rule 6-302 - correct answer ✔✔When determining the insulation requirements for overhead service conductors, which of the following variables are important? 6 kW; Explanation in Rule 8-202 - correct answer ✔✔An apartment has 13 suites with living areas of 110 meters squared. What is the basic load applied toward the apartment feeder, based on the area of the suite? True; Found in Rule 46-304 - correct answer ✔✔Emergency lighting unit equipment (240V) may be connected using the flexible cord and attachment plug supplied with the unit if the marked input rating is not more than 24 A. The block diagram. - correct answer ✔✔What type of diagram has only one line carried between the pieces of equipment? It would be connected to terminals 5 and L2. - correct answer ✔✔A pilot light to indicate that a motor is running in the reverse direction is to be connected to a NEMA reversing starter. What terminals would it be connected to? It has 6 sets of contacts in its power circuit. - correct answer ✔✔A three- phase reversing magnetic starter has how many sets of contacts in its power circuit? The largest motor should be started first. - correct answer ✔✔When several motors are supplied with a rotary phase converter, which motors should be started first? It stops as soon as heat exchanger and the air in the plenum has cooled down. - correct answer ✔✔When does the fan in a domestic gas furnace stop?
To use approved connectors only. (Wire nuts with oxidation paste) - correct answer ✔✔What must be taken into account when connecting copper and aluminum together? A voltage rating equal to the voltage rating of the original insulation. Rule 12- 112 - correct answer ✔✔What must insulation used to cover an electrical splice consist of? Its response time is relatively slow. - correct answer ✔✔What is the main disadvantage of a thermocouple flame-proving circuit? It uses an intermittent. - correct answer ✔✔A rooftop unit that has a main and pilot gas valve uses what type of ignition? Red. - correct answer ✔✔What colour must the WHMIS label on a black container be? 3 - correct answer ✔✔The minimum number of conductors required to connect a three-way switch for proper operation is: Rule 4-006, Table 4 and 24; 180A ----> T24 = 50 Kohms - correct answer ✔✔What is the minimum insulation resistance of three number 4/0 AWG RW90XLPE aluminum conductors, when installed in a run of rigid conduit and terminated in fusible switch with no marked equipment termination temperature? Orthographic drawings - correct answer ✔✔What is used to make construction drawings of a building? Cutting Plane line. - correct answer ✔✔What do you call the line used to "slice" through a wall that shows a cross-section of that wall?
The motor cycles on the overload relay. - correct answer ✔✔What happens when a single-phase motor with internal overload protection has a shorted run winding? 100 - correct answer ✔✔The third colour band on a general purpose resistor is red. What multiplier does this represent? They are numbered 3,2 and 5,4. - correct answer ✔✔How are the holding contacts on a NEMA forward/reversing motor magnetic starter numbered? The reason is that the heaters are incorrectly sized. - correct answer ✔✔A magnetic motor starter is controlling a ten horsepower motor. After a prolonged overload the starter does not drop out. What may the reason be this? A spiral bimetal, disc bimetal and liquid bulb. - correct answer ✔✔What three types of temperature sensing devices can be used in a high limit switch? It is indicating an expected reading. - correct answer ✔✔An ohmmeter is connected across terminals 3 and 5 of a reversing motor magnetic and the meter reads 200 ohms. What is the reading most likely indicating? They are called the Alternate and the American Standard. - correct answer ✔✔What are the two ways to connect the secondaries of a delta-delta transformer, to provide a three-wire output called? It changes electrical energy into linear motion. - correct answer ✔✔What is the function of a solenoid? An advantage of an autotransformer is that they require less iron and copper to construct than mutual induction transformers of the same kVA rating. - correct answer ✔✔What is an advantage of autotransformers?
It consists of two windings and a common core of iron. - correct answer ✔✔What does a basic single-phase transformer consist of? The core losses of a transformer can be calculated by performing the open circuit test. - correct answer ✔✔The core losses of a transformer can be calculated by performing what type of test? 3 - correct answer ✔✔A smoke alarm used to interconnect to another unit must have at least how many wires connect to the unit itself? 600 Volts - correct answer ✔✔What is the maximum voltage rating of a service that may be installed without instrument transformers? White - correct answer ✔✔Which conductor color cannot be used as a switch leg? The high limit, thermostat and main gas valve. - correct answer ✔✔Which devices are connected in series in the 120 Volt heating system? A possible cause is that an overload heater has burnt out. - correct answer ✔✔Pushing the armature of a NEMA motor magnetic starter in and then performing a continuity test between L1 and T1 indicates infinity. What is a possible cause for this? 600V; Found in rule 64-302 - correct answer ✔✔What is the maximum voltage allowed for small wind systems turbine output circuits connected to single dwellings? 680 ohms - correct answer ✔✔If a 1 watt resistor has the following colour bands: Blue, Grey, Brown, Silver. What is the resistance value of the resistor?
It will go into single phasing when a fuse blows in the power circuit. - correct answer ✔✔When will a three-phase motor go into single phasing condition? At one point only at the consumer service. Found in Rule 10-204 - correct answer ✔✔Where must the connection be made for the grounding conductor in a single family dwelling? False - correct answer ✔✔A squirrel cage induction motor will have slip rings on the rotor. #8 AWG Rule 26-208 - correct answer ✔✔A three-phase capacitor bank is rated at 15 000 VAR. The supply voltage is three-phase 240 Volts 60 Hz. All conductor terminations are rated at 90 °C.. What is the minimum size of R copper conductor required to connect the capacitor bank? 1300; Rule 28-210 - correct answer ✔✔When used for branch circuit protection, an instantaneous-trip circuit breaker shall be rated or adjusted for an AC motor to trip at not more than _____% of the motor full load current. A normally closed switch is used. - correct answer ✔✔What type of switch is used on an anti-plugging circuit for a three-phase motor? Double pole - correct answer ✔✔Two load conductors can be switched using a _______ switch. It consists of a temperature sensing device attached to a set of contacts. - correct answer ✔✔What does a thermostat used for a furnace consists of?
It consists of a solid state device with a positive temperature coefficient. - correct answer ✔✔What does a Resistance Temperature Detector - RTD consists of? The WRIM has reduced starting current. - correct answer ✔✔Given a SCIM and a WRIM of equal horsepower ratings which of the following is correct? Resistance value and tolerance. - correct answer ✔✔What are ratings commonly found on color-coded composition resistors? It measures energy - correct answer ✔✔What does a kilowatt-hour meter measure? 1 - correct answer ✔✔How many travelers are energized at the same time in a 3 way switching circuit? It remains open if the flue was blocked. - correct answer ✔✔When will the combustion air-prove switch remain open? 27.7 kVA - correct answer ✔✔A 48 kVA load is supplied by an open-delta/open delta transformer bank. What is the minimum calculated kVA rating required for each transformer? The covering must be removed at terminals and splices to avoid creepage of current over it. Explained in Rule 12-104 - correct answer ✔✔What must occur to conductors that have a flame tested covering? A group of solar panels joined in parallel. - correct answer ✔✔What is an "array" when referring to Photovoltaic systems?
High Pressure Sodium (orange color) - correct answer ✔✔What type of lamp is ideal for application in warehouse, parking lot? Rule 8-102, Table D3 (2 questions) - correct answer ✔✔Do you know how to use the volt drop table? Before the work start. - correct answer ✔✔When do you need to get a permit? Class C - correct answer ✔✔What is the Fire Extinguisher class for Fire involving energized electrical equipment? Rule 2-130, App.B - correct answer ✔✔Questions on FT conductors Current below the fuse rating - correct answer ✔✔What would be the cause of fuse holder to heat up? Should be within sight and within 9m; Rule 28-604 - correct answer ✔✔Where are the disconnect located for a motor? Should be within sight and within 3m; Rule 28-604 - correct answer ✔✔Where's the motor disconnecting means for air conditioner and refrigeration equipment? 60 degree table 19 - correct answer ✔✔What is the maximum temperature rating for a cable in a plenum? Perimeter and internal. - correct answer ✔✔What are the two groups that intrusion-sensing devices are divided into?
Where the calculated load on the service conductors exceeds 250 kVA. Found in Rule 2-110 - correct answer ✔✔When can branch circuits in dwelling units have a voltage exceeding 150 Volts to ground? 90 - correct answer ✔✔Luminaries installed where combustible material is liable to be stored shall be equipped with shades or guards so as to limit the temperature to which the combustible material may be subjected to a maximum of ______ degrees C. 10%. Found in Rule 26-218 - correct answer ✔✔With motor circuit capacitors time delay devices shall be installed in the motor control circuit of motors driving high inertia loads so that the motor can not be restarted until the residual voltage is reduced by _____% of the nominal voltage Almost all branch circuits supplying 120 Volt receptacles at 20 Amps or less. Found in Rule 26-656 - correct answer ✔✔Which circuits in a dwelling unit must be protected by an AFCI? Crosstalk - correct answer ✔✔What is the term used to describe a signal that is induced into a conductor by signals being transmitted in another conductor? 75% of the basement area based on inside dimensions. Found in Rule 8-110 - correct answer ✔✔How is the basement area taken into consideration toward the main service calculation for a single dwelling? Use a clamp to clamp it down - correct answer ✔✔When cutting a 3/ rod,there are lot of vibration. What can you do to eliminate it.
Table D6, p.757 - correct answer ✔✔What is the tighten torque for connector hexagonal head (split bolt) #8 AWG wire size? To prevent a chemical reaction with the copper and the rubber - correct answer ✔✔Why are high voltage copper cable conductors sometimes coated with tin or lead? 50, Rule 26-222 - correct answer ✔✔After a capacitor circuit has been discharged a voltmeter reading on the capacitor must show _____V or less It should be connected in the forward stop circuit. - correct answer ✔✔It is desired to be able to go directly from forward to reverse without pressing the stop button therefore the normally closed contacts of the reverse start button should be connected in which circuit of the reversing motor magnetic? It good for controlling high current loads. - correct answer ✔✔In a disc type temperature-sensing device, the snap action contacts are suitable for controlling what type of loads? When temperature differential is not as important as in residences. - correct answer ✔✔When are 120 Volt heating systems used in commercial and industrial buildings? It controls the fan blower and the combustion air blower. - correct answer ✔✔What does the 120 V section of the electronic control board control? KV/mm. - correct answer ✔✔The unit of measurement for dielectric strength is
You need to interchange the armature leads. - correct answer ✔✔A single- phase universal motor can have its direction of rotation changed by interchanging the which leads? The "pigtails" in a DC dynamo connected to the brushes. - correct answer ✔✔What are the "pigtails" in a DC dynamo connected to? By a sliding contact. - correct answer ✔✔How can the ohmic value of a variable resistor be changed? In a vacuum tube. - correct answer ✔✔In what is an alarm system magnetic reed switch housed? 11875 Watt; Rule 8-106, Rule 62-118 - correct answer ✔✔What is the demand towards the main service calculation of a single dwelling for a space heating load of 12,500 watts and a 8700VA air conditioner? (Loads are interlocked so only one can used at a time)
6, Rule 8-202 - correct answer ✔✔An apartment has 12 suites each with an
area of 92 meters squared. Each suite has one-12 kW range, one-4 kW dryer, and two-2400 Watt special lighting loads. What AWG conductor size is required using RW90 copper for the suite feeder. (120/240 V service) Equipment termination temperature is 75 degrees Celsius. It is limited by an alternator's armature current capacity. - correct answer ✔✔What is an alternator's total loading capacity limited by? You would have to decrease the shunt field current. - correct answer ✔✔What do you have to do to operate a DC motor at above base speed?
1 m; Rule 2-308 - correct answer ✔✔What is the minimum working space for low voltage MCC? 40A, Rule 30-104 - correct answer ✔✔What is the maximum Overcurrent device rated for HID luminaires in a warehouse, where the input voltage is not over 120V input? True, Rule 26-722 - correct answer ✔✔Is that true, all receptacles installed outdoors and within 2.5m of finished grade shall be protected with a ground fault circuit interrupter of the Class A type? 5-20R. Rule 26-710 - correct answer ✔✔For rooftop unit, a receptacle is provided for maintenance, what is it CSA configuration? L9-20R, Diagram 2 (p.525) - correct answer ✔✔What is the CSA configuration for locking receptacle for a 20A at 600V? 600mm, Rule 12-012, Table 53 - correct answer ✔✔A metal sheath of 600V in a Vehicular areas, what is its minimum cover for those direct buried cables? 60A, Table D2, Table 29 - correct answer ✔✔What is the max O/C rating of a 5hp, 120V DC? True, Rule 46-400 - correct answer ✔✔Where exit signs are connected to an electrical circuit, that circuit shall be used for no other purpose. Exit signs are required by the National Building Code of Canada. Steel wool - correct answer ✔✔What should be used to clean a flame sensor on a precision boiler?
Two dissimilar metals combined which expand at different rates as temperature increases - correct answer ✔✔Define a thermistor? 18.3m; Table D4 - correct answer ✔✔A 6V circuit is supplying remote lamps 10.2m away using #8 AWG Cu conductor. What is maximum current the circuit is permitted to supply? 38.5A From T44 @ 230V note (1) (28A x 1.10)= 30.8A x 1.25 (any ≥ 1.15 S.F will be 1.25) - correct answer ✔✔The setting of the overload device for a 3ф 208V, 10hp 1.15 service factor motor should be: =1249.075A = 24981.502A=====> 25000A - correct answer ✔✔What minimum interrupting rating in amperes would you specify for the overcurrent protection of a 450KVA, 208V 3ф transformer. The IZ% = 5% 100A cables with over current located at the panel board - correct answer ✔✔When costs are considered, what is the minimum requirement to supply a 100A panel board from a 600A splitter when they are located 17.5m apart? In exit light; From 46-108 (4) (b) - correct answer ✔✔When do DC and AC commonly occupy the same enclosure? Not exceeding 15m, Rule 36-006 - correct answer ✔✔What is the max distance for a warning notices on a station fence shall be placed? Strip to length, folding back the shield, slide on the connector and use the crimp to compress. - correct answer ✔✔What is the process of termination for CATV cable (Coax cable, F stype crimp, RG-59...) 7, 20, 25, 27 or so... 7, there are seven symbols in the plans. - correct answer ✔✔Blue print of Medical Clinic, with a lightning lay out on the floor plan. A
