generation transmission distribution power stations load factor diversity factor tariffs faults protection switchgear cables earthing estimation costing utilization of electrical energy basic electronics - One Line Questions
1.
The final voltage delivered to a typical household in many countries is: —
400 V / 230 V
2.
An 'Integrated Circuit' (IC) consists of: —
A complex network of transistors, resistors, and capacitors on a single chip
3.
Which type of circuit breaker uses oil as a dielectric medium to extinguish the arc? —
Oil Circuit Breaker
4.
A 'Diode' is a semiconductor device that primarily allows current to flow in: —
Only one direction
5.
Which of the following is a semiconductor material commonly used in electronic devices? —
Silicon
6.
Which of the following is typically NOT included in an electrical 'Estimation'? —
Cost of power generation at the source
7.
The primary insulation material used in high-voltage cables is typically: —
Impregnated Paper and Polymers (like XLPE)
8.
Which type of electric motor is commonly used for applications requiring high starting torque, such as in electric trains? —
DC Series Motor
9.
'Costing' in electrical projects involves: —
Determining the total expenditure incurred or to be incurred
10.
Which type of earthing is commonly used for domestic appliances? —
Equipment Earthing (e.g., Protective Earthing)
11.
Which electrical appliance uses energy for heating purposes? —
Electric Heater
12.
A 'Two-Part Tariff' typically includes charges for: —
Fixed charges plus energy consumed
13.
An 'Overcurrent Relay' operates when the circuit current: —
Exceeds a predetermined value
14.
Which type of tariff aims to charge consumers based on the amount of energy consumed? —
Block Rate Tariff
15.
Which type of tariff is often used for industrial consumers to penalize high peak demands? —
Maximum Demand Tariff
16.
A 'Cable' is a conductor or group of conductors insulated from each other and enclosed in a protective sheath, used for: —
Transmitting and distributing electrical energy
17.
Which component is used to reduce the voltage from transmission levels to distribution levels? —
Step-down Transformer
18.
Which of the following is NOT a primary component of a typical AC transmission system? —
Batteries
19.
Distribution substations typically receive power at what voltage level? —
Medium voltage (e.g., 11 kV, 33 kV)
20.
A higher diversity factor implies that the system's peak load is: —
Lower than the sum of individual peak loads
21.
The 'Utilization of Electrical Energy' primarily deals with: —
How electrical energy is converted into other useful forms of energy (light, heat, mechanical work)
22.
A high load factor for a power station indicates: —
Efficient utilization of capacity
23.
The process of converting Alternating Current (AC) to Direct Current (DC) is called: —
Rectification
24.
The 'Diversity Factor' is always: —
Greater than 1
25.
SF6 (Sulfur Hexafluoride) is a highly effective insulating and arc-quenching medium used in: —
Medium and High voltage circuit breakers
26.
What is the formula for Load Factor? —
Average Load / Maximum Demand
27.
Basic electronics deals with the behavior and control of: —
Electrical charges (electrons and holes) in semiconductor devices
28.
A 'Single Line-to-Ground' fault involves a connection between: —
One phase conductor and earth
29.
What is the main disadvantage of a thermal power station concerning environmental impact? —
Greenhouse gas emissions
30.
Which electronic component is used to store electrical energy in an electric field? —
Capacitor
31.
Which type of fault is the most severe in an AC power system? —
Three-phase symmetrical fault
32.
Geothermal power stations harness energy from which natural source? —
Earth's internal heat
33.
Diversity Factor is defined as the ratio of: —
Sum of maximum demands of individual consumers to the maximum demand of the whole system
34.
In electric lighting, the luminous efficacy is a measure of: —
The amount of light produced per unit of power consumed (lumens per watt)
35.
When estimating the quantity of wiring for a room, factors like the number of points, length of runs, and: —
Provision for future expansion and wastage
36.
'Estimation' in electrical work refers to: —
The process of calculating the cost and quantity of materials required for a project
37.
In the context of electrical energy utilization, what is 'Illumination'? —
The provision of artificial light
38.
What does 'Load Factor' represent in power system analysis? —
The ratio of average load to connected load
39.
A 'Maximum Demand Tariff' charges consumers based on: —
The highest power drawn during the billing period
40.
Which type of power station primarily relies on the potential energy of water stored at a height? —
Hydroelectric Power Station
41.
In a nuclear power station, what is the primary function of the moderator? —
To slow down fast neutrons
42.
What is the primary function of a 'Circuit Breaker'? —
To automatically interrupt fault currents
43.
The main function of 'Earthing' in an electrical system is: —
To provide a low resistance path for fault current to flow to the ground, ensuring safety
44.
What is the main purpose of stepping up the voltage during power transmission? —
To reduce current and thus reduce line losses (I^2R losses)
45.
What is the purpose of 'Protection Relays' in a power system? —
To detect abnormal conditions and initiate circuit breaker operation
46.
What is the main purpose of the 'Sheath' in a power cable? —
To provide mechanical protection and prevent moisture ingress
47.
What is the primary role of a 'Fuse' in an electrical circuit? —
To protect the circuit from overcurrent by melting and breaking the circuit
48.
What is the main function of a 'Transistor' in electronic circuits? —
To act as a switch or an amplifier
49.
The 'Simple Tariff' charges a: —
Fixed rate per unit of energy, regardless of consumption