Description : The function of fuse in an electrical circuit is (a) avoid electric shocks (b) regulate the flow of current (c) break the circuit in case of overloading or short circuiting (d) switch off current
Last Answer : Ans:(c)
Description : Before servicing the device indicated as 'A' in panels #1 and #3 of the illustration, the device labeled 'CT' must __________. EL-0003 A. have the disconnected leads taped to prevent ... D. have one lead grounded to discharge static electricity for the prevention of damage to electronic components
Last Answer : Answer: C
Description : In testing a three-phase delta winding for an open circuit using a megohmmeter, you must ______________. A. test each phase with all connections intact B. measure the voltage across the open ... groups to avoid short circuiting D. open the delta-connections to avoid shunting the phase being tested
Last Answer : Answer: D
Description : The purpose of a motor undervoltage protection device is to _____________. A. prevent high armature current when power is restored B. start the motor at a very low voltage C. trip the load off the motor in case of fire D. protect personnel from low voltage shocks
Last Answer : Answer: A
Description : Moisture accumulating in electric motors and generator windings having a cold insulation resistance greater than 50,000 ohms may be baked out with internal heat. This heat can be developed by ____________. ... an electric welder and feeding it into the armature while running the motor at full speed
Description : The main function of a fuse is to (a) protect the line (b) open the circuit (c) protect the appliance (d) prevent excessive currents (e) none of the above
Last Answer : (d) prevent excessive currents
Description : How can you prevent getting electrical shock from an appliance cord?
Last Answer : The cord should be in good shape with no breaks in the coating, no fraying, no exposed wires. Plug the appliance in by holding the plastic housing, not the prongs. Don't use the appliance around ... the area directly outside the plug. If the plug is slowly removed the chances of shock are lower.
Description : A bird sitting on a high tension electric wire does not get electrocuted because – (1) it has high resistance (2) the body is earthed (3) it does not form a closed path for the flow of current (4) its feet are good insulators
Last Answer : (3) it does not form a closed path for the flow of current Explanation: Electricity travels from a place of high voltage to low voltage, just as water travels from high elevation to low ... When electricity travels through a body in this fashion, electrocution takes place, and the bird can die.
Description : A bird sitting on a high tension electric wire does not get electrocuted because (1) it has high resistance (2) the body is earthed (3) it does not form a closed path for the flow of current (4) its feet are good insulators
Last Answer : it does not form a closed path for the flow of current
Description : What is the most likely thing to happen if I must plug in the very short cord of a small electrical appliance into an extension cord or power strip rather than a wall outlet? What's the worst that could happen?
Last Answer : For some reason toasters have notoriously short cords and I've never received a reasonable excuse. The best I could come up with was that the cord was kept short to prevent the thing from falling ... has a 3 prong plug (grounded) you want a grounded extension cord plugged into a grounded outlet.
Description : Which of the following are consumer semi-durable goods? (1) Cars and television sets (2) Milk and Milk products (3) Foodgrains and other food products (4) Electrical appliance like fans and electric irons.
Last Answer : (3) Foodgrains and other food products Explanation: Goods which are neither indestructible nor lasting are defined as Semi Durable Goods. They fall in the category between Durable Goods and ... are clothing or preserved foods: vehicles and electronic home appliances are classified as Durable Goods.
Description : Which of the following are consumer semi-durable goods ? (1) Cars and television sets (2) Milk and Milk products (3) Foodgrains and other food products (4) Electrical appliance like fans and electric irons.
Last Answer : Foodgrains and other food products
Description : When one turns off the car with out powering down the a/c, fan, and radio does it contribute to short circuiting?
Last Answer : As long as the car is operating correctly, none of these actions will cause any harm. Manufacturers do not expect you to power down everything before shutting off the car.
Description : Under what condition, the current passing through the resistance R can be increased by short - circuiting the battery of emf `E_2` The internal resist
Last Answer : Under what condition, the current passing through the resistance R can be increased by short - circuiting the battery of ... (1)r_(2)gtE_(2)(R+r_(1))`
Description : An open occurring within the field rheostat of an AC generator can be detected by short circuiting its terminals and observing a ____________. A. negative deflection of the wattmeter pointer B. ... of the wattmeter pointer C. buildup of alternator voltage D. low, but constant alternator voltage
Description : Which of the following is a characteristic of fractional horsepower repulsion start motors? A. They start with a rotating stator field. B. The short circuiting ring is removed from the commutator while ... brushes are removed from the commutator while starting. D. They have a low starting torque.
Last Answer : Answer: B
Description : Temporary repairs to an open DC propulsion armature coil can be made by _____________. A. connecting the coil ends directly to a pair of negative brushes B. disconnecting coil ends, insulating ... C. grounding the coil ends and short circuiting the commutator bar D. removing the sparking brushes
Description : [75] Two transformers are connected in parallel. These transformers do not have equal percentage impedance which results A. Short-circuiting of the secondaries B. Power factor of one of the ... have negligible core losses D. Loading of the transformers not in proportion to their kVA ratings.
Last Answer : D. Loading of the transformers not in proportion to their kVA ratings
Description : Underground cables are laid at sufficient depth (a) to minimise temperature stresses (b) to avoid being unearthed easily due to removal of soil (c) to minimise the effect of shocks and vibrations due to gassing vehicles, etc. (d) for all of the above reasons
Last Answer : (c) to minimise the effect of shocks and vibrations due to gassing vehicles, etc.
Description : A circuit breaker is designed to protect an electrical circuit from damage caused by : (A) Over load (B) Short circuit (C) Over current (D) All of the above
Last Answer : A circuit breaker is designed to protect an electrical circuit from damage caused by : (A) Over load (B) Short circuit (C) Over current (D) All of the above
Description : Air gap readings for electrical generating equipment should be taken periodicly. This is to _______. I. determine the condition of the bearings II. prevent damage to the rotor and stator A. I only B. II only C. both I and II D. neither I or II
Description : The purpose of staking is to a. Protect the trunk b. Prevent root damage due to wind action c. Prevent wind injury to branches d. Prevent damage due to fros
Last Answer : Prevent wind injury to branches
Description : what can I use to protect the trunks of my citrus trees against sprinkler damage
Last Answer : All fruit and nut trees do better if the trunks are painted with a white interior latex paint mixed 50/50 with water. This keeps the trunk from sunburning. I imagine your landscaper wants to avoid ... roots down into the ground, not up seek water where they might cause heaving of concrete, etc.
Description : That's probably a fabrication, isn't it? Where would she take the current.
Last Answer : Electric eel live in the waters of South American rivers and swamps. It grows to a length of two and a half meters and a full four-fifths of the length of its body is occupied ... to communicate with each other. http://www.lidovky.cz/jeste-nabitejsi-uhor-0rr-/veda.aspx?c=A081007_084657_ln_veda_mtr
Description : The process by which RBI or any Central bank protects the economy against adverse economic shocks is known as : a) protection b) liberalization c) stabilization d) sterilization
Last Answer : d) sterilization
Description : On electrical generators one of the bearings is isolated from the bedplate. This insulating block should not be painted and must be kept clean to ___________. A. protect operating personnel from shock ... the prime mover as it warms up D. eliminate shaft currents to prevent damaging the bearings
Description : The air gap in an induction motor should be periodically checked with a feeler gage to prevent possible ___________. A. rotor contact with the stator B. axial misalignment of the rotor C. damage to the motor bearings D. electrical damage to the bearings
Description : Which of the listed procedures should be carried out to prevent moisture damage to electrical apparatus during extended periods of idleness? A. Fill the motor housing with CO2 to inert the space. B. Strap ... C. Place heat lamps in the motor housings. D. Cover the equipment with a canvas tarpaulin.
Description : The proper way to apply plastic electrical tape to an electric cable splice is to _____________. A. apply tape to the braided cover, but avoid touching it B. wind the tape so that each turn overlaps ... tape in one non-overlapping layer only D. heat the tape with a soldering iron for good bonding
Description : Why control transformer is earthed?
Last Answer : If it is not earthed grounding of control circuit at two different places can cause bypassing of logics. In case of primary and secondary of the control transformer is getting the main fuse ... 415v will be superimposed in the control circuit during short circuit of primary and secondary winding)
Description : Why the neutral is earthed through earthing resistance in case of UT and SUT?
Last Answer : This is done to limit the earth fault current.
Description : Can I wear any type of footwear and still be earthed?
Last Answer : No. Standard plastic/rubber or composite soles do not conduct the Earth's electric energy. Most shoes today are made from those materials. You need leather or hide soles, which used to be ... . Hopefully soon shoe companies will begi shoe companies will begin making n making grounded grounded shoes.
Description : In a semiconductor diode, p-side is earthed and to n-side is applied a potential of -2 volt; the diode shall (a) Conduct (b) Not conduct (c) Conduct partially (d) Break down
Last Answer : a) Conduct
Description : A thermostat is a device for (a) switching off an electrical appliance (b) measuring temperature (c) regulating temperature (d) producing heat
Description : What is The amount of energy transferred per unit time by an electrical appliance is measured in what?
Last Answer : tme
Description : One kilowatt-hour is the amount of electrical energy that is consumed by 1000 watt appliance in ____. A. 30 minutes B. 45 minutes C. 1 hour D. 1 our and 15 minutes
Last Answer : ANSWER: C
Description : One kilowatt-hour is the amount of electrical energy that is consumed by 1000 watt appliance in ____. A. 30 minutes B. 45 minutes C. 1 hour 24 D. 1 our and 15 minutes
Description : What is the purpose of the green conductor in a power tool or electrical appliance cable?
Last Answer : To prevent electrical shock to the operator in case there is an electrical short to the frame of the appliance or too.
Description : A. active power B. reactive power C. apparent power D. A & C E. B & C
Last Answer : D
Description : Which of the following represents the accepted method of cleaning dust and foreign particles from electrical equipment while limiting damage to electric components? A. Carefully wiping off the components ... the components. D. Using carbon tetrachloride as a cleaning solvent to clean the components.
Description : The earth-wire of a cable is connected to – (1) the outer metallic body of the appliance (2) the fuse of the appliance (3) the filament of the appliance (4) short circuitry of the appliance
Last Answer : (2) the fuse of the appliance Explanation: Earth wire prevents Electric shocks. It is connected to the electrical cable of an appliance to prevent electric shocks. Actually it has very low resistance and allows current to pass through it easily.
Description : The earth-wire of a cable is connected to (1) the outer metallic body of the appliance (2) the fuse of the appliance (3) the filament of the appliance (4) short circuitry of the appliance
Last Answer : the fuse of the appliance
Description : Thermal overload relays are used to protect the motor against over current due to (a) short-circuits (b) heavy loads (c) grounds (d) all of the above
Last Answer : (b) heavy loads
Description : A thermal protection switch can protect against (a) short-circuit (b) temperature (c) overload (d) over voltage
Last Answer : (c) overload
Description : When preparing a class III cavity for composite restoration; in which situation should acid itching be used: A. Always should be performed to minimise marginal leakage B. Should not be ... extra retention is required D. Only in situations where cavity is shallow to avoid pulp irritation
Last Answer : A. Always should be performed to minimise marginal leakage
Description : When measuring AC current flow, you must always connect the meter _____________. A. in series with the power source and load B. in parallel with the power source and load C. insuring correct polarity D. using the lowest range possible to prevent instrument damage
Description : A low-voltage protection circuit is used in electric motor starting equipment to _____________. A. trip circuit contactors when the motor overspeeds due to low voltage B. trip circuit ... voltage without manually resetting D. prevent the motor from restarting automatically on restoration of voltage
Description : One should not connect a number of electrical appliances to the same power socket because 1. this can damage the appliances 2. this can damage the domestic wiring due to overheating 3. the appliances will not get full voltage Which ... valid reasons? (a) 2 and 3 (b) 2 only (c) 1 and 2 (d) 3 only
Last Answer : Ans:(b)
Description : During burning of magnesium, we should wear sun glasses to protect our eyes from white dazzling light as it: (a) damage the retina (b) leads to loss of our vision (c) both (a) & (b) (d) none of these
Last Answer : (c) both (a) & (b)