SSC JE Exam - generation transmission distribution power stations load factor diversity factor tariffs faults protection switchgear cables earthing estimation costing utilization of electrical energy basic electronics Question Bank with Options

1. Which of the following is a semiconductor material commonly used in electronic devices?

A) Copper

B) Aluminum

C) Silicon

D) Gold

2. In the context of electrical energy utilization, what is 'Illumination'?

A) The process of generating electricity

B) The provision of artificial light

C) The measurement of voltage

D) The transmission of power

3. What is the primary role of a 'Fuse' in an electrical circuit?

A) To increase the current carrying capacity

B) To protect the circuit from overcurrent by melting and breaking the circuit

C) To regulate the voltage

D) To store electrical energy

4. The process of converting Alternating Current (AC) to Direct Current (DC) is called:

A) Inversion

B) Modulation

C) Rectification

D) Amplification

5. Which electronic component is used to store electrical energy in an electric field?

A) Resistor

B) Inductor

C) Capacitor

D) Diode

6. An 'Integrated Circuit' (IC) consists of:

A) A single transistor

B) A single resistor

C) A complex network of transistors, resistors, and capacitors on a single chip

D) A power transformer

7. What is the main function of a 'Transistor' in electronic circuits?

A) To store electrical energy

B) To act as a switch or an amplifier

C) To generate heat

D) To convert AC to DC

8. A 'Diode' is a semiconductor device that primarily allows current to flow in:

A) Both directions

B) Only one direction

C) No direction

D) Alternating directions

9. Basic electronics deals with the behavior and control of:

A) Mechanical systems

B) Electrical charges (electrons and holes) in semiconductor devices

C) Chemical reactions

D) Thermal energy

10. Which type of electric motor is commonly used for applications requiring high starting torque, such as in electric trains?

A) DC Series Motor

B) DC Shunt Motor

C) Synchronous Motor

D) Induction Motor

11. In electric lighting, the luminous efficacy is a measure of:

A) The brightness of the light

B) The power consumption of the lamp

C) The amount of light produced per unit of power consumed (lumens per watt)

D) The color temperature of the light

12. The 'Utilization of Electrical Energy' primarily deals with:

A) How electricity is generated

B) How electrical energy is converted into other useful forms of energy (light, heat, mechanical work)

C) The transmission losses in power lines

D) The design of power stations

13. Which electrical appliance uses energy for heating purposes?

A) Electric Fan

B) Electric Heater

C) Television

D) Computer

14. When estimating the quantity of wiring for a room, factors like the number of points, length of runs, and:

A) The color of the walls

B) The type of ventilation system

C) Provision for future expansion and wastage

D) The ambient temperature

15. 'Costing' in electrical projects involves:

A) Determining the total expenditure incurred or to be incurred

B) Only calculating the price of materials

C) Designing the electrical circuits

D) Ensuring safety standards

16. Which of the following is typically NOT included in an electrical 'Estimation'?

A) Cost of conductors

B) Cost of labor

C) Cost of insulation material

D) Cost of power generation at the source

17. 'Estimation' in electrical work refers to:

A) The physical installation of wiring

B) The process of calculating the cost and quantity of materials required for a project

C) The testing of electrical equipment

D) The design of the electrical layout

18. What is the main purpose of the 'Sheath' in a power cable?

A) To increase the conductor's resistance

B) To provide mechanical protection and prevent moisture ingress

C) To act as the primary conductor

D) To radiate heat

19. The primary insulation material used in high-voltage cables is typically:

A) Cotton

B) Paper

C) Impregnated Paper and Polymers (like XLPE)

D) Rubber

20. A 'Cable' is a conductor or group of conductors insulated from each other and enclosed in a protective sheath, used for:

A) Generating electrical power

B) Transmitting and distributing electrical energy

C) Controlling motor speed

D) Measuring electrical quantities

21. Which type of earthing is commonly used for domestic appliances?

A) Direct Earthing

B) System Earthing

C) Equipment Earthing (e.g., Protective Earthing)

D) Electrode Earthing

22. The main function of 'Earthing' in an electrical system is:

A) To improve power factor

B) To provide a low resistance path for fault current to flow to the ground, ensuring safety

C) To increase the voltage supplied to appliances

D) To reduce energy consumption

23. An 'Overcurrent Relay' operates when the circuit current:

A) Falls below a predetermined value

B) Exceeds a predetermined value

C) Becomes zero

D) Reverses direction

24. What is the purpose of 'Protection Relays' in a power system?

A) To increase power factor

B) To detect abnormal conditions and initiate circuit breaker operation

C) To control voltage levels

D) To distribute power to consumers

25. SF6 (Sulfur Hexafluoride) is a highly effective insulating and arc-quenching medium used in:

A) Low voltage circuit breakers

B) Medium and High voltage circuit breakers

C) DC circuit breakers

D) Fuse boxes

26. Which type of circuit breaker uses oil as a dielectric medium to extinguish the arc?

A) Air Blast Circuit Breaker

B) Vacuum Circuit Breaker

C) SF6 Circuit Breaker

D) Oil Circuit Breaker

27. What is the primary function of a 'Circuit Breaker'?

A) To continuously regulate voltage

B) To automatically interrupt fault currents

C) To increase power factor

D) To measure energy consumption

28. A 'Single Line-to-Ground' fault involves a connection between:

A) One phase conductor and two phases

B) One phase conductor and earth

C) Two phase conductors

D) All three phase conductors and earth

29. Which type of fault is the most severe in an AC power system?

A) Single line-to-ground fault

B) Line-to-line fault

C) Double line-to-ground fault

D) Three-phase symmetrical fault

30. A 'Two-Part Tariff' typically includes charges for:

A) Energy consumed only

B) Fixed charges plus energy consumed

C) Maximum demand only

D) Power factor and energy consumed

31. Which type of tariff is often used for industrial consumers to penalize high peak demands?

A) Flat Rate Tariff

B) Block Rate Tariff

C) Maximum Demand Tariff

D) Two-Part Tariff

32. The 'Simple Tariff' charges a:

A) Variable rate per unit of energy

B) Fixed rate per unit of energy, regardless of consumption

C) Rate based on maximum demand

D) Rate based on connected load

33. A 'Maximum Demand Tariff' charges consumers based on:

A) The total energy consumed

B) The highest power drawn during the billing period

C) A fixed rate per unit of energy

D) The number of electrical appliances used

34. Which type of tariff aims to charge consumers based on the amount of energy consumed?

A) Flat Rate Tariff

B) Block Rate Tariff

C) Maximum Demand Tariff

D) Simple Tariff

35. A higher diversity factor implies that the system's peak load is:

A) Higher than the sum of individual peak loads

B) Lower than the sum of individual peak loads

C) Equal to the sum of individual peak loads

D) Zero

36. Diversity Factor is defined as the ratio of:

A) Sum of maximum demands of individual consumers to the maximum demand of the whole system

B) Maximum demand of the whole system to the sum of maximum demands of individual consumers

C) Average load to the maximum demand

D) Connected load to the maximum demand

37. The 'Diversity Factor' is always:

A) Less than 1

B) Equal to 1

C) Greater than 1

D) Zero

38. What is the formula for Load Factor?

A) Maximum Demand / Average Load

B) Average Load / Connected Load

C) Average Load / Maximum Demand

D) Energy Consumed / (Maximum Demand * Time Period)

39. A high load factor for a power station indicates:

A) Inefficient utilization of capacity

B) Efficient utilization of capacity

C) Excessive peak demand

D) Low energy generation

40. What does 'Load Factor' represent in power system analysis?

A) The ratio of maximum demand to average load

B) The ratio of average load to connected load

C) The ratio of maximum demand to connected load

D) The ratio of energy consumed to the time period

41. The final voltage delivered to a typical household in many countries is:

A) 132 kV

B) 33 kV

C) 400 V / 230 V

D) 11 kV

42. Distribution substations typically receive power at what voltage level?

A) High voltage (e.g., 132 kV, 220 kV)

B) Medium voltage (e.g., 11 kV, 33 kV)

C) Low voltage (e.g., 400 V, 230 V)

D) Very low voltage (e.g., 50 V)

43. Which component is used to reduce the voltage from transmission levels to distribution levels?

A) Generator

B) Synchronous Condenser

C) Step-down Transformer

D) Circuit Breaker

44. What is the main purpose of stepping up the voltage during power transmission?

A) To increase power delivery

B) To reduce current and thus reduce line losses (I^2R losses)

C) To make the transmission lines safer

D) To simplify the design of transmission towers

45. Which of the following is NOT a primary component of a typical AC transmission system?

A) Generators

B) Transformers

C) Switchgear

D) Batteries

46. Geothermal power stations harness energy from which natural source?

A) Solar radiation

B) Wind currents

C) Earth's internal heat

D) Ocean tides

47. In a nuclear power station, what is the primary function of the moderator?

A) To absorb neutrons

B) To slow down fast neutrons

C) To control the chain reaction rate

D) To generate heat

48. What is the main disadvantage of a thermal power station concerning environmental impact?

A) Radioactive waste disposal

B) High water consumption for cooling

C) Greenhouse gas emissions

D) Risk of nuclear accidents

49. Which type of power station primarily relies on the potential energy of water stored at a height?

A) Thermal Power Station

B) Nuclear Power Station

C) Hydroelectric Power Station

D) Geothermal Power Station

generation transmission distribution power stations load factor diversity factor tariffs faults protection switchgear cables earthing estimation costing utilization of electrical energy basic electronics - Question Bank