46 . Which component is used to control voltage in long transmission lines?
  • A. Transformer
  • B. Reactor
  • C. Synchronous condenser
  • D. Isolator
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47 . What is the typical battery voltage used in electric rickshaws in Bangladesh?
  • A. 12V
  • B. 24V
  • C. 48V
  • D. 72V
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48 . 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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49 . What is a major benefit of implementing smart grid technology in Bangladesh?
  • A. Real time monitoring and fault detection
  • B. Automatic load control only
  • C. Decrease fuel consumption
  • D. Increase generator efficiency
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50 . 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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51 . Vcc=10 V সহ একটি CE অ্যামপ্লিফায়ার হতে সর্বোচ্চ অবিকৃত আউটপুট সিগনাল পেতে হলে Vce(Q) এর মান কত হওয়া উচিত?
  • A. 5 V
  • B. 10 V
  • C. 6 V
  • D. 0.1 V
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Military Engineer Services||Sub-Assistant Engineer(E/M)(15-02-2025)||2025
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52 . TV programs are telecast using a combination of modulation techniques. Which of the following combination is used?
  • A. Frequency and phase modulation
  • B. Phase and Pulse modulation
  • C. Amplitude and frequency modulation
  • D. Amplitude and Pulse modulation
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53 . 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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54 . The speed of an induction motor can be controlled by:
  • A. Changing motor field current
  • B. Changing rotor resistance only
  • C. Varying supply frequency only
  • D. Varying supply frequency and voltage
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55 . The maximum power point tracking (MPPT) in a solar system is used to:
  • A. Extract maximum power under varying condition
  • B. Inverts DC to AC
  • C. Protect panel from over voltage
  • D. Facing solar panel to the sun
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56 . 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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57 . 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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58 . The Kaptai Dam, the only hydroelectric power station in Bangladesh, has an installed capacity of:
  • A. 100MW
  • B. 150MW
  • C. 310MW
  • D. 230MW
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59 . 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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60. The open circuit voltage between terminals 'A' and 'B' is:
  • A. 12V
  • B. 24V
  • C. 20V
  • D. 40V
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