1 . Which motor is commonly used in small electric vehicles?
- A. DC motor
- B. Stepper motor
- C. Induction motor
- D. Brushless DC motor
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2 . The torque of squirrel cage induction motor is:
- A. Constant at all speeds
- B. Maximum at synchronous speed
- C. Zero at synchronous speed
- D. Proportional to rotor speed
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3 . Which component is used to control voltage in long transmission lines?
- A. Transformer
- B. Reactor
- C. Synchronous condenser
- D. Isolator
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4 . A three phase fault is considered the most severe because:
- A. It results in the highest fault current
- B. It causes insulation breakdown
- C. High frequency occurs
- D. If causes harmonics
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5 . The main function of a bus bar in a sub-station is to :
- A. Convert AC to DC
- B. Distribute power to outgoing feeder
- C. Reduce short-circuit current
- D. Step down voltage
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6 . What is the main barrier to large-scale solar-park development in Bangladesh?
- A. Low demand
- B. Excess sunlight
- C. Lack of PV technology
- D. Land Scarcity
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7 . In a transistor, the operating point is most stable when using:
- A. Two battery Bias
- B. Fixed Bias
- C. Collector-to-Base Bias
- D. Self-Bias
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8 . Which modulation technique is commonly used in voltage source inverters?
- A. Pulse width shift modulation
- B. Frequency shift Keying
- C. Phase angle control
- D. Sinusoidal PWM
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9 . What are the features of instrumentation amplifier?
- A. Low noise
- B. High gain accuracy
- C. Low thermal and time drift
- D. All of the above
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10 . A thyristor (SCR) is a:
- A. PNP device
- B. NPN device
- C. PNPN device
- D. PN device
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11 . The efficiency of a typical crystalline silicon solar PV panel is:
- A. 5%-8%
- B. 15%-22%
- C. 25%-30%
- D. 35%-40%
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12 . In Power system, the main purpose of load flow studies is to determine:
- A. Frequency stability
- B. Voltage and current at different buses
- C. Relay coordination
- D. Power factor correction
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13 . Which of the following devices is used to protect power system from lighting surges?
- A. Circuit breaker
- B. Isolator
- C. Lightning arrester
- D. Switch gear
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14 . A transistor in saturation region acts like a:
- A. High resistance
- B. Closed switch
- C. Open switch
- D. Variable resistor
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15 . The main function of a freewheeling diode in a power converter is to:
- A. Increase output voltage
- B. Provide a path for inductive load current
- C. Protect a switch from overvoltage
- D. Regulate input current
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