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Xem trước 25/165 câu hỏi trong đề. Bấm Vào thi để làm bài trực tuyến, được chấm điểm và xem đáp án chi tiết.
Câu 1. (CLO1) What is an electrical circuit?
- A. A device that generates electricity
- B. A device that stores electricity
- C. A path along which electric current can flow
- D. A device that measures electricity
Câu 2. (CLO1) What is the purpose of a circuit breaker in an electrical system?
- A. To convert AC power to DC power
- B. To regulate voltage
- C. To control current flow
- D. To protect electrical circuits from overcurrent and short circuits
Câu 3. (CLO1) Which type of circuit is used to convert AC power to DC power?
- A. Rectifier circuit
- B. Amplifier circuit
- C. Filter circuit
- D. Oscillator circuit
Câu 4. (CLO1) What is a transistor made up of
- A. Chip
- B. Insulator
- C. Semiconductor
- D. Metal
Câu 5. (CLO1) Anode is polarity in diodes
- A. Negative
- B. Positive
- C. Ground
- D. Hot side
Câu 6. (CLO1) Which of the following is made of semiconductors?
- A. Diode
- B. Resistor
- C. Capacitor
- D. Inductor
Câu 7. (CLO1) What is the purpose of a diode?
- A. To convert AC to DC
- B. To convert DC to AC
- C. To regulate voltage levels
- D. To allow current to flow in only one direction
Câu 8. (CLO1) The output is true if either of the input is true. This statement represents .............
- A. NAND gate
- B. OR gate
- C. AND gate
- D. XOR gate
Câu 9. (CLO1) Which of the following is made up of semiconductors?
- A. Transistor
- B. Resistor
- C. Capacitor
- D. Inductor
Câu 10. (CLO1) Which of the following gate is called an inverter
- A. NOT gate
- B. OR gate
- C. AND gate
- D. NAND gate
Câu 11. (CLO1) Which of the following is not a logic gate?
- A. NAND gate
- B. IF gate
- C. AND gate
- D. XOR gate
Câu 12. (CLO1) The is the quantity or condition that is varied by the controller so as to affect the value of the controlled variable. Normally, the controlled variable is the output of the system.
- A. controlled variable
- B. control signal
- C. control system
- D. controller
Câu 13. (CLO1) What is/are the advantage(s) of an open-loop control system?
- A. Simple
- B. Economical
- C. Low maintenance
- D. All of the above
Câu 14. (CLO1) What is/are the advantage(s) of closed-loop control systems?
- A. Reliable
- B. Fast
- C. Optimizable
- D. All of the above
Câu 15. (CLO1) Which of the following should be done before working on electrical equipment?
- A. Wear insulated gloves
- B. Use a metal ladder
- C. Keep the equipment plugged in
- D. Stand on a wet surface
Câu 16. (CLO1) Which of the following should be done before working on electrical equipment?
- A. Wear insulated gloves
- B. Use a metal ladder
- C. Keep the equipment plugged in
- D. Stand on a wet surface
Câu 17. (CLO1) Which of the following should be used to disconnect power to electrical equipment before servicing?
- A. Screwdriver
- B. Pliers
- C. Circuit breaker
- D. Hammer
Câu 18. (CLO1) In induction motor, greater the number of poles
- A. Lesser the speed
- B. Greater the speed
- C. Lesser the frequency
- D. All of these
Câu 19. (CLO1) Principal types of DC machine
- A. Shunt motors, series motors and compound motors
- B. Series motors and compound motors
- C. Compound motors
- D. None of the above
Câu 20. (CLO1) In the following motor, external resistance can be added to start the motor
- A. Slip ring induction motor
- B. Squirrel cage induction motor
- C. Salient pole synchronous motor
- D. Wound rotor synchronous motor
Câu 21. (CLO1) If in a 3-phase induction motor, two phases open accidentally, the motor will
- A. Run at dangerously high speed
- B. Stop
- C. Continue to run depending on load
- D. None of these
Câu 22. (CLO1) In a 3-phase squirrel cage induction motor
- A. Rotor conductors are short circuited through end rings
- B. Rotor conductor ends are short circuited through slip rings
- C. Rotor conductors are kept open
- D. None of the above
Câu 23. (CLO1) The stator of 3 phase induction motor has 3 slots per pole per phase. If supply frequency is 50Hz, Calculate speed of the rotating stator flux
- A. 500 rpm
- B. 900 rpm
- C. 800 rpm
- D. 1000 rpm
Câu 24. (CLO3) In solar-thermal power plants, the solar energy is collected by thousands of , called heliostats, that reflect the sun’s energy to a single receiver atop a centrally located tower.
- A. turbine generator
- B. sun-tracking mirrors
- C. solar photovoltaic
- D. boiler
Câu 25. (CLO3) The enormous amount of energy focused on the receiver is used to generate high temperature to melt salt. The hot molten salt is stored in a storage tank, and is used, when needed, to generate steam and drive the .
- A. turbine generator
- B. sun-tracking mirrors
- C. solar photovoltaic
- D. boiler
… và còn 140 câu nữa. Bấm Vào thi phía trên để làm toàn bộ 165 câu và xem đáp án.
