61 . JFET কে কি ধরনের ডিভাইস বলা হয়?
- A. কারেন্ট কনট্রলড
- B. ভোল্টেজ কনট্রলড
- C. A & B উভয়
- D. কোনটিই নয়
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62 . 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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63 . 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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64 . For a thyristor, the forward breakover voltage is maximum when:
- A. Gate current = ∞
- B. Gate current = 0
- C. Gate current =-∞
- D. It is independent of gate current.
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65 . For 11100101 (in 2's complement form), the corresponding decimal number is:
- A. +37
- B. -31
- C. +15
- D. -27
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66 . DC মোটরের গতি কোনটির উপর নির্ভরশীল?
- A. ফ্ল্যাক্স
- B. আর্মেচার সার্কিট রেজিস্ট্যান্স
- C. ভোল্টেজ
- D. সবগুলোই
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67 . At T = OK, the Fermi-level in an n-type semiconductor lies:
- A. Below the donor level
- B. half-way between the bottom of conduction band and donor level
- C. half-way between the top of valence band and acceptor level
- D. coincides with intrinsic fermi level
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68 . A transistor in saturation region acts like a:
- A. High resistance
- B. Closed switch
- C. Open switch
- D. Variable resistor
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69 . A thyristor (SCR) is a:
- A. PNP device
- B. NPN device
- C. PNPN device
- D. PN device
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70 . 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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71 . A net-metering system in a solar PV allows:
- A. Exporting excess electricity to the grid
- B. Preventing grid access
- C. Protecting the grid system
- D. Importing the grid energy during night
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72 . Which of the following challenges is most critical for smart grid deployment in rural Bangladesh?
- A. Excessive rainfall
- B. Lack of communication infrastructure
- C. Too many substations
- D. Abundant power supply
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75 . 250V, 200W একটি বাতির রোধ হবে-
- A. 625 Ω
- B. 312.5 Ω
- C. 1250 Ω
- D. 31.25 Ω
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Military Engineer Services||Sub-Assistant Engineer(E/M)(15-02-2025)||2025
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