All Free Electrical Engineering MCQs with Answers
Every Electrical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
3,143 questions · page 148 of 158
- A. Little maintenance cost
- B. Ease in installation
- C. Low losses
- D. All of the above
Explanation: Static capacitors have no moving parts, making them easy to install and maintain, and their power losses are small.
Correct answer: All of the above2942. When the demand of consumers is not met by a power plant, it will resort to which of the following?
- A. Efficient plant operation
- B. Power factor improvement at the , generators
- C. Penalising high load consumers by increasing the charges for electricity
- D. Load shedding
Explanation: When available generation cannot meet demand, selected feeders or consumers are disconnected temporarily to balance the system.
Correct answer: Load shedding- A. Unskilled workers only
- B. Skilled workers only
- C. Equipment only
- D. All of the above
Explanation: Plant insurance commonly covers equipment and may also include employee injury or workmen-compensation coverage, covering both the plant…
Correct answer: All of the above- A. Shares
- B. Fixed deposits
- C. Cash certificates
- D. Bonds
Explanation: Shares represent ownership capital and normally have no fixed repayment date.
Correct answer: Shares- A. Poor voltage regulation
- B. Increased transmission losses
- C. High cost of equipment for a given load
- D. All of the above
Explanation: A low power factor requires higher current for the same useful power, causing greater transmission losses and poorer voltage regulation.
Correct answer: All of the above- A. Solar power plants
- B. Gas turbine power plants
- C. Nuclear power plants
- D. Hydro-electric power plants
Explanation: Nuclear plants require highly skilled engineers because reactor control, radiation safety, fuel handling, and complex protection systems…
Correct answer: Nuclear power plants- A. plant reserve capacity will be zero
- B. diversity factor will be unity
- C. load factor will be unity
- D. load factor will be nearly 60%
Explanation: Reserve capacity equals plant capacity minus maximum demand. If maximum demand reaches the entire plant capacity, no generating capacity…
Correct answer: plant reserve capacity will be zero- A. Soap
- B. Sugar
- C. Vegetable oil
- D. Caustic soda
Explanation: Vegetable-oil production generally consumes the least electrical energy per ton among these industries.
Correct answer: Vegetable oil- A. Hot reserve
- B. Cold reserve
- C. Spinning reserve
- D. Firm power
Explanation: Cold reserve consists of generating units that are shut down but maintained in working condition for emergency use.
Correct answer: Cold reserve- A. increased business activity
- B. increased water supply
- C. increased use of fans and air conditioners
- D. none of the above
Explanation: Summer demand rises mainly because fans and air conditioners operate more frequently and for longer periods.
Correct answer: increased use of fans and air conditioners- A. Steam
- B. Diesel
- C. Hydroelectric
- D. Any of the above
Explanation: Hydroelectric plants usually have the longest service life because their main civil structures, such as dams and waterways, can remain…
Correct answer: Hydroelectric- A. fuel cells
- B. solar cells
- C. MHD generators
- D. none of the above
Explanation: An MHD generator converts the thermal energy of a hot, electrically conducting gas directly into electricity without an intermediate…
Correct answer: MHD generators- A. arc lamps
- B. induction motors
- C. fluorescent tubes
- D. incandescent lamp
Explanation: An incandescent lamp is mainly a resistive load, so its current and voltage are nearly in phase and its power factor is close to unity.
Correct answer: incandescent lamp- A. plant is used for stand by purpose only
- B. plant is under maintenance
- C. plant is used for base load only
- D. plant is used for peak load as well as base load
Explanation: Utilization factor is the ratio of maximum demand to plant capacity. A low value means much of the installed capacity remains unused, as…
Correct answer: plant is used for stand by purpose only- A. total installed capacity of the plant
- B. sizes of the generating units
- C. operating schedule of generating units
- D. all of the above
Explanation: A load curve shows demand variation with time, so it determines the required installed capacity, suitable generating-unit sizes, and their…
Correct answer: all of the above- A. sinking fund depreciation
- B. straight line depreciation
- C. reducing balances depreciation
- D. none of the above
Explanation: Under reducing-balance depreciation, the annual depreciation is calculated as a fixed percentage of the plant's diminishing book value, so…
Correct answer: reducing balances depreciation- A. zero slope
- B. positive slope
- C. negative slope
- D. All of these
Explanation: A load curve may rise, fall, or remain constant over different time intervals, giving positive, negative, or zero slope.
Correct answer: All of these- A. operating schedule of generating units
- B. sizes of generating units
- C. total installed capacity of the plant
- D. all of the above
Explanation: The load curve provides both the magnitude and time variation of demand, allowing engineers to select plant capacity, unit sizes, and the…
Correct answer: all of the above- A. fixed cost of unit generated
- B. running cost of unit generated
- C. both A. and B.
- D. neither A. nor B.
Explanation: A higher diversity factor reduces the combined maximum demand compared with the sum of individual demands, lowering required plant…
Correct answer: fixed cost of unit generated- A. average demand
- B. energy consumed
- C. maximum demand
- D. none of the above
Explanation: The area under a load-versus-time curve is load multiplied by time, which gives electrical energy consumed, usually in kWh.
Correct answer: energy consumed