MCQs on DMAES Part 2

Electrical Engineering MCQs — Energy Management & Power Systems

Electrical Engineering MCQs — Energy Management & Power Systems

Practice 25 MCQs. Click “Show Answers” to reveal the correct options.

  1. The main objective of energy management is to

    • Minimize energy cost
    • Minimum environmental effects
    • Maintain optimum energy procurement and utilization
    • Only A and B
    • All of these ✓ Correct

  2. Which is the major energy source to meet the Indian energy demand?

    • Coal ✓ Correct
    • Oil
    • Natural gas
    • Lignite

  3. Which country has the biggest coal reserves?

    • Russia
    • US ✓ Correct
    • China
    • India

  4. In the given options, the non-commercial source of energy is

    • Coal
    • Lignite
    • Firewood ✓ Correct
    • Refined petroleum products

  5. Which of the following circuit breakers has the lowest operating voltage?

    • SF6 circuit breaker
    • Air break ✓ Correct
    • Air blast
    • Minimum oil circuit breaker

  6. On what factor does the operating speed of the relay depend?

    • Rate of flux built up
    • Armature core air gap
    • Spring tension
    • All of these ✓ Correct

  7. Protective relays can be designed to respond to ___________.

    • Light intensity, impedance
    • Temperature, resistance, reactance
    • Voltage and current
    • All of these ✓ Correct

  8. What is the purpose of back up protection?

    • To increase the speed
    • To increase the reach
    • To leave no blind spot
    • To guard against failure of primary ✓ Correct

  9. A _________ distribution system is more reliable than the ______ distribution system.

    • parallel, radial ✓ Correct
    • parallel, ring
    • radial, parallel
    • ring, parallel

  10. What is infinite bus in power system?

    • A large system with infinite voltage
    • A large system in which the voltage and frequency varies
    • A large system whose voltage and frequency remains constant throughout. ✓ Correct
    • Both (a) and (b)
    • None of these

  11. What is the simplified diagram called, after omitting all resistances, static loads, capacitance of the transmission lines and magnetising circuit of the transformer?

    • Single line diagram
    • Resistance diagram
    • Reactance diagram ✓ Correct
    • Both (a) and (b)
    • None of these

  12. Which of these systems uses the 3 phase 4 wire system?

    • Primary distribution
    • Secondary distribution ✓ Correct
    • Primary transmission
    • Secondary transmission

  13. Which component connects the substation to the area where power is to be distributed?

    • Distributors
    • Service mains
    • Feeders ✓ Correct
    • All of these

  14. Name the cable which connects the distributor to the consumer terminals.

    • Distributors
    • Service mains ✓ Correct
    • Feeders
    • All of these

  15. Assertion (A): Transmission of electrical power by dc is economical than that with ac.
    Reason (R): In case of dc transmission, there is no charging current which contributes to the continuous load, even on no load.

    • Both A and R are true and R is the correct explanation of A
    • Both A and R are true and R is not the explanation of A ✓ Correct
    • A is true but R is false
    • A is false but R is true

  16. Line efficiency increases for ___________________ transmission voltages.

    • Higher ✓ Correct
    • Lower
    • Both (a) and (b)
    • None of these

  17. The most important disadvantage of using the high voltage for transmission is

    • The increased cost of insulating the conductors
    • The increased cost of transformers, switchgear and the other terminal apparatus
    • Both (a) and (b) ✓ Correct
    • There is a reduction in the corona loss

  18. A bus-bar is rated by

    • Current only
    • Voltage only
    • Current , voltage and frequency
    • Current, voltage, frequency and short circuit current ✓ Correct

  19. The material used for bus-bar should have

    • Low resistivity
    • Low-cost
    • High Softening temperature
    • All of the above ✓ Correct

  20. Which of the following bus-bar schemes has the lowest cost?

    • Ring bus-bar scheme
    • Single bus-bar scheme ✓ Correct
    • Breaker and a half scheme
    • Main and transfer scheme

  21. Which of the following can be used for bus-bars?

    • Tubes
    • Rods
    • Bars
    • Any of the above ✓ Correct

  22. Due to which of the following reasons aluminium is being favoured as bus-bar material?

    • Low-density
    • Low-cost ✓ Correct
    • Ease of fabrication
    • None of the above

  23. Which of the following bar schemes is the most expensive?

    • Double bus-bar double breaker ✓ Correct
    • Ring bus-bar scheme
    • Single bus-bar scheme
    • Main and transfer scheme

  24. When an alternator connected to the bus-bar is shut down the bus-bar voltage will

    • Fall
    • Rise
    • Remain unchanged ✓ Correct
    • None of the above

Tip: Use the “Show Answers” button for quick self-check.

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