1.Which of the following is NOT an important outcome of estimation?
Explain:- Quality management system is not an important outcome of estimation. A quality management system is a set of policies, processes and procedures required for planning and execution in an organization.
2.According to BIS, the panel board and meter board are to be kept at a height of______?
Explain:- According to BIS -
1.The panel board and meter board are to be kept at a height of 1.5 meter.
2.The maximum number of points in a sub-circuit is 10.
3.The maximum load for single light and fan sub circuit should not exceed 800 W.
3.Earth resistance does NOT depend on _____.
Explain:- The resistance of earth is the resistance between the earth and earth electrode. It depends on -
1. The resistance of earth electrode the contact resistance between electrode surface and soil.
2. The resistivity of soil between the electrode and earth.
3. Salt content in the soil.
4. Nature of soil
5. Content of iron
4.The pipe electrode used for earthing shall not be less than minimum length requirement of
Explain:- Pipe earthing - In pipe earthing method the galvanized steel and perforated pipe of approved length and diameter in place upright in permanently wet soil.
The size of the pipe depends upon the current to be carried and the type of soil. The size of the pipe used for earthing is of diameter 40 mm and 2.5 meters in length for ordinary soil or greater length in case of dry and rocky soil.
The depth at which the pipe must be buried depends on the moistures of the ground.
The depth at which the pipe must be buried depends on the moistures of the ground. The pipe is placed at 3.7 meters.
5.Which of the following is used for connection from starter to the motor as it is to be taken over the foundation bed on which the motor is placed?
Explain:- Flexible conduits is used for connection from starter to the motor as it is to be taken over the foundation bed on which the motor is placed. According to Indian electricity rules, the maximum length of the flexible conduits in motor installation is should be less than 1.25m.
6.The logical method of estimating for electrical works does NOT involve which of the following processes?
Explain:- Following processes is involve in the logical method of estimating for electrical works-
1.Average costing of accessories.
2. Price items at net cost.
3. Provide overhead charges.
But ascertain the quantities does not involve accurately
7.Earthing is required to protect apparatus, equipment, machines etc. from________.
Explain:- Earthing:- The process of connecting the metallic frame of electrical equipment to earth is called earthing.
2.It is required to protect apparatus equipment machines etc from leakage current.
8.Comparative statement is an important document to evaluate ____.
Explain:- Comparative statement is an important document to evaluate offers received against an enquiry. It is also used to compare a particular financial statement with prior statement
9.Tenders are ordinarily invited on tender forms prescribed for the purpose. If any alteration is to be made, it should be done after taking prior sanction of the ______
Explain:- Tenders are ordinarily invited on tender forms prescribed for the purpose. If any alteration is to be made, it should be done after taking prior sanction of the competent authority.
10.If the contractor fails to submit with bill the document of handing over charge on inventory form duly signed by the user department concerned, then the amount deducted will generally be ____.
Explain:- If the contractor fails to submit with bill the document of handing over charge on inventory form duly signed by the user department concerned, then the amount deducted will generally be 5%.
11.In a comparative statement while compiling information on the tender evaluation sheet/format , which of the following is NOT of a special attention?
Explain:- A comparative statement is a document used to compare a particular financial statement with period statements. Previous financials are presented alongside the latest figures in side-by-side columns, enabling investors to identify trends, track a company's progress and compare it with industry rivals. In a comparative statement while compiling information on the tender sheet the name of the supplier is not a special attention.
12.The earnest money of unsuccessful tenders is refunded to the tenderers as soon as possible after_______.
Explain:- The earnest money of unsuccessful tenders is refunded to the tenderers as soon as possible after disposal of tenders.
13.Rates offered in the tender remain valid for _____from the date of opening of the tender.
Explain:- Rates offered in the tender remain valid for 3 months from the date of opening of the tender.
14.The estimator should have knowledge of works, labour, reliability and possible faults, and his cost statements must be based on ______.
Explain:- The estimator should have knowledge of works, labour, reliability and possible faults, and his cost statements must be based on reliable evidence
15.Which of the following information is NOT required for a purchase order?
Explain:- Purchase order -
1. Buyer's name of address.
2. Seller's name and address.
3. A purchase order number.
4. Name and address of the supplier.
5. Due date of delivery
16.Rate should be given for each item of work , separately in words and in figures. In case there is any difference in rates between words and figures, then ___.
Explain:- Rate should be given for each item of work , separately in words and in figures. In case there is any difference in rates between words and figures, then the lowest of the two will be taken.
17. A tender is usually accompanied with an amount called ______.
Explain:- A tender is usually accompanied with an amount called earnest money.
1. Earnest money deposit is a financial guarantee to be furnished by the bidder along with its tender.
2. Earnest money is also known as bid security.
18.A tender is usually accompanied with an amount called ______.
Explain:- A tender is usually accompanied with an amount called earnest money.
1.Earnest money deposit is a financial guarantee to be furnished by the bidder along with its tender.
2.Earnest money is also known as bid security.
19.All tenders received for the same contract are opened by the competent authority in person at the advertised time and place in the presence of _______.
Explain:- All tenders received for the same contract are opened by the competent authority in person at the advertised time and place in the presence of either agents or contractors.
20.Before taking work in hand, even the contractor following good management practices may be unaware of _________.
Explain:- Before taking work in hand, even the contractor following good management practices may be unaware of contingencies.
21.In house wiring the total connected load per sub- circuit can be-
Explain:- 1. In house wiring for one light and fan circuit total connected load = 800 Watt
Maximum number of point = 10
2.In one power sub-circuit the maximum load that can be normally connected = 3000 Watt
3. Number of socket–outlets which can be provided = 2
22.What is the maximum number of point of light, fan and socket-outlets that can be connected in one sub-circuit?
Explain:- 1. Light, fan and 5A socket, there will be a circuit for total 10 points or 800 watt.
2.15A socket fall under the category of power circuits for which there will be a circuit of two points or 3000 watt.
23.The cheap and temporary system of internal wiring is-
Explain:- 1.Cleat wiring system is used where temporary work need to be performed at low cost.
2.Cleat wiring is the cheapest method of wiring. The wire remain exposed to view, and these wires are drawn through cleats made of porcelain or plastic or some other approved material.
24.Branch circuit must not feed more than............. points.
Explain:- 1. Branch circuit must not feed more than 10 points and 800 watt.
2.In power circuit only two circuit and maximum power 3000 watt is allowed according to IE Rule.
25.…………. earthing is the best form of earthing and is very cheap in cost-
Explain:-Pipe earthing is best form of earthing and it is cheap also in this system of earthing a GI pipe of 38mm dia and 2.5 meter length is embedded vertically in the ground to work as earth electrode
26.The conductor, by means of which the metal body of an equipment or an application is connected to the earth, is known as-
Explain:- The electrode, which is connected by a conductor is connected to earth to protect an equipment is called earth continuity conductor. It gives return path to equipment at abnormal condition.
Nature of electrodes depends upon following- 1.It should be smooth
2.Resistance is very low.
3.Soil depth
4.Nature of soil
27.The earth’s potential is taken as–
Explain:- Electric potential at a point is defined with respect to a reference point. We take potential at the surface of earth as reference and is defined as zero. By convention, electrostatic potential of earth is taken to be zero. It is considered that earth is a storehouse of infinite negative charges.
28.According to Indian Electricity Act, the permissible voltage drop at the consumer terminals of a distribution feeder is-
Explain:- According to Indian Electricity Act rule number 54, the permissible voltage drop at the consumer terminals of a distribution feeder is ± 6%.
29.The another name of neutral earthing is-
Explain:- The another name of neutral earthing is system earthing.
30.The size of neutral wire as compared to that of line wire should be in case of single phase supply-
Explain:- The size of neutral wire as compared to that of line wire should be equal in case of single phase supply because the neutral wire carries the same current as the line wire carries single phase circuit.
31.________is used to manufacture stay wire, earth wire, and structural components-
Explain:- Galvanised steel is used to manufacture stay wire, earth wire etc. The use of Galvanised steel does not cause rust. It is made by zinc coating on steel.
32.In case of stair case wiring which type of switch is used?
Explain:- Stair case wiring is a common multi-way switching or two-way light switching connection. Here one lamp is controlled by two switches from two different position.
33.If a live wire comes in contact with metal casing, excess current moves to............
Explain:- If the live wire come in contact with the metal casing accidentally, current will flow through the casing and if the user touch the casing, will get an electrical shock. But the earth wire has a resistance much lower than the human body. This will allow the leakage current to flow through it to the earth instead of through the user's body.
34.Wiring clips are usually made of -
Explain:- Wiring clips are usually made of steel. These are made in size of 25 mm and 30 mm. Wiring clip is placed at a distance of 15 cm for vertical run and 10 cm for horizontal run, wiring clip is flexible to organize and fix the wiring. In order to make it easy to install at flame and chassis of machine.
35.The switch unit need not be on the what type of wire ?
Explain:- There is no need of switch on neutral type of wire. Switches are always used in phase wire and In case of D.C. (Direct current), switch can be placed at earth wire also. Neutral wires carry currents back to power source to better control and regulate voltage. Its overall purpose is to serve as a path to return energy
36.What is the meaning of sweep in case of ceiling fan ?
Explain:-1. Meaning of sweep in case of ceiling fan is blade size. 2.Sweep helps to consider the volume of air that can be moved by the fan.
37.Which type of wiring having very long life ? Conduit wiring have –
Explain:-(i) Very long life
(ii) Appearance is better
(iii) No risk of fire or mechanical wear and tear.
(iv) Safe from humidity, smoke, steam etc.
(v) No risk of shock
38.During arcing ground conditions, the phase voltage of the system rises to-
Explain:- The phenomenon of arcing ground occurs in the ungrounded 3-phase systems because of the flow of the capacitance current. During the fault, the voltage across the capacitance reduces to zero in the faulted phase, while in the other phases the voltage is increased by the factor of √3 times.
39.Which type of earthing is also called as 'fire
earthing'?
i. Plate earthing
ii. Rod earthing
iii. Strip earthing
Explain:- Rod earthing is also called as fire earthing, when an electric device, appliance or electrical installation is connected to the earth electrode without any fuse, circuit breaker or resistance/ impedance. It is called solidly earthed or rod earthing.
40.What type of earthing is used by transmission lines?
Explain:- 1. Strip earthing is used in transmission line. Strip earthing electrode is not less than 25mm × 4mm of GI or steel.
2.Strip earthing electrode is not less than 25mm×1.6mm of copper.
41.For large power stations, the maximum permissible value of earth resistance is-
Explain:-
42.What is the diameter of the GI pipe through which the earth wire needs to be taken out?
Explain:- The GI pipe through which the earth wire needs to be taken out it's diameter is 13mm.
43...............should be provided as the working space the main switchboard according to Indian Electricity Rule 51.
Explain:-According to the Indian Electricity Rule 51 provisions applicable to medium high or extra-high voltage installations the following provision shall be observed where energy at medium, high or extra-high voltage is supplied, converted transformed or used. A clear space of not less than 3 feet (or 0.914m) in width shall be provided in front of the switch board.
44.Which among these is a type of internal
wiring?
i. Cleat wiring
ii. Conduit wiring
iii. CTS wiring
Explain:- Cleat wiring- This system of wiring comprise of ordinary VIR or PVC insulated wire braided and compounded held on walls or ceilings by means of porcelain cleats, plastic or wood. Cleat, conduit, CTS these three wiring is internal wiring.
45.For earthing of electric motors upto 10 HP, the size of copper and GI earth electrode are-
Explain:- 1.Size of copper electrode- 60cm × 60cm × 3.18 mm.
2.Size of GI earth electrode- 60 cm × 60 cm × 6.35 mm.
46.In batten wiring the cables are carried on seasoned teak wood perfectly straight and well varnished teak wood batten of thickness not less than-
Explain:- Batten wiring:- This is when a single wire or some group of wire is laid over a wooden batten. These wires are held to the batten for using a brass clip and spaud at an interval of 10 cm for horizontal runs and 15 cm for vertical runs. The teak wood batten of thickness not less than 1cm.
47.For cleat wiring and 250 volts supply, the cables will be placed _____ a part centre to centre for single core cables.
Explain:- The cleat should be provided every 60 cm to avoid sag in the cables. Sharp bends should be avoided in the wiring and the spacing between the cleats should be reduced to prevent the touching of the wall and sagging the distance between the cables should be 2.5 cm in the case of branch circuit and 4 cm apart in the case of sub-mains.
48.Which type of fire extinguisher is to be used on electrical equipment or installation under fire?
Explain:- Halon fire extinguisher are a special type of fire extinguisher that contain a gas that interrupts the chemical reaction that takes place when fuels burn. This type of fire extinguisher is often used to protect valueable electrical equipment since they leave no residue.
49.How will you test the supply in plug point?
Explain:- The supply of plug point is tested using tester, multimeter and voltmeter. AC power plug and socket allow electrical equipment to be connected to the primary alternating current power supply in foiling and other supply sites.
50.The ground wire is used to-
Explain:- 1. The ground wire is used to connect a circuit conductor or other device to an earth plate.
2.The purpose of a ground wire is to give excess electrical charges a safe place to go. The solid mass of earth below out feet has negative electrical charge, which means positive electrical charges are naturally attracted to it.
51.The earth pit should not be located near-
Explain:- The earth pit should not be located near roads rail tracks and pavements. Difference between earth pit and place where is to be done should be minimum 1.5 m distance. Material of earth wire and earth electrode should be same. Earthing is done for safety of human life, building, equipment, voltage stabilization, over voltage protection etc.
52.In wiring and winding an abbreviation for S.W.G. is-
Explain:- SWG is an abbreviation for 'standard wire gauge' in wiring and winding. Standard wire gauge is a set of wire sizes given by BS3737; 1964. It is also known as British standard gauge and Imperial wire gauge. It is still used as a measure of thickness in guitar strings and some electrical wire.
53.No ceiling fan should be installed at height of less than-
Explain:- No ceiling fan should be installed at a height of less than 2.5 meter. It should be in the middle of the room. For maximum air flow there should be at least 10 inches of air space between the blades and the ceiling.
54.Replacement of wiring is not easy in which type of wiring ……
Explain:-Replacement of concealed wiring is not easy because this is done inside the plaster of walls. Concealed conduct wiring is most commonly used wiring system because it protects the wires from external damage and increases their longevity.
55.In an electric heater, the metal case is connected to …..
Explain:- In an electric heater, we connect the metal case to the earth wire that protects us from fault occurring over heater and protects from electric shock. Heating coils are commonly made up of metal alloys, which are a combination of two or more elements. The most commonly used metal alloy in nichrome (alloy of nickel 80% and chromium 20%).
56.The insulating material suitable for low temperature applications is ……..
Explain:- Diatomaceous earth is the most suitable insulating material for low temperature application. Diatomaceous earth is a naturally occurring, soft, siliceous sedimentary rock that is easily crumbled into a fine white to off-white powder. Diatomaceous earth powder is inserted into the vacuum space to aid in the effectiveness of vacuum insulation.
57.Which type of fan is called as fresh air fans?
Explain:- A balanced ventilation system usually has two duct fans and two fans system. Fresh air supply and exhausts vents can be installed in every room, but a typical balanced ventilation system is designed to supply fresh air to bedrooms and living rooms where occupants spend the most time.
58.The sweep of ceiling fan is indicated by-
Explain:- The sweep of ceiling fan is indicated by milimeter. Ceiling fans are measured by full size of their blade span (Blade sweep), which is diameter of the circle that you see when the fan blades are in motion.
59.Find the current carrying capacity of wire from meter to main distribution board having three light/fan circuits of 800 W each and two 15 A power circuits of 1.5 kW each . Take the permissible power factor as 0.8 and safety factor as 1.5.
Explain:-
60.Which of the following types of wiring is preferred for workshop lighting?
Explain:- Concealed conduit wiring is preferred for workshop lighting.
In concealed wiring, conduit pipes are buried under the plaster of the wall with GI wire inside. After with the use of GI wires, the main PVC is insulated cables are drawn through the conduit.