1 . Condition of electricity transmission is -
- A. high voltage transmission
- B. using heavy wire
- C. using copper conductor
- D. Using bundled conductor
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বিভিন্ন মন্ত্রণালয় | সহকারী ম্যানটেনেন্স প্রকৌশলী | 24-05-2022
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2 . In a step down transformer, there is a charge of 15A in the load current. This results in changing of supply current of
- A. Less than 15 A
- B. Greater than 21 A
- C. More Than 21A
- D. None
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বিভিন্ন মন্ত্রণালয় | সহকারী ম্যানটেনেন্স প্রকৌশলী | 24-05-2022
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3 . In absorption of inosolation the most signficant part is played by
- A. Ozone
- B. Oxygen
- C. Haze
- D. Carbon dioxide
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4 . The applied voltage of a certain transformer is increased by 50%, while the frequency is reduced by 50%. The maximum core flux density will
- A. become three times
- B. become 1.5 times
- C. become half
- D. remian the same
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বিভিন্ন মন্ত্রণালয় | সহকারী ম্যানটেনেন্স প্রকৌশলী | 24-05-2022
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5 . The emf generated in a dc generator is directly proportional to
- A. Flux per pole
- B. No, of oples
- C. Spped of armature
- D. all above
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বিভিন্ন মন্ত্রণালয় | সহকারী ম্যানটেনেন্স প্রকৌশলী | 24-05-2022
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6 . The speed of a DC shunt motor is required to be more than full load speed . This is possible by-
- A. reducing the field current
- B. decreasing the armature current
- C. increasing the armature current
- D. None of the above
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বিভিন্ন মন্ত্রণালয় | সহকারী ম্যানটেনেন্স প্রকৌশলী | 24-05-2022
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7 . Which of the following statement holds true for the divergence of electric and magnetic flux dendities?
- A. Both are zero
- B. These are zero for static flux dendities but non-zero for time -varying flux dendities
- C. It is zero for electric flux densities
- D. It is zero for magnetic flux densities
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বিভিন্ন মন্ত্রণালয় | সহকারী ম্যানটেনেন্স প্রকৌশলী | 24-05-2022
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8 . A cantilever beam of length L carries a gradually varying load form zero at free and w per unit length at the fixed end. The maximum deflection lies at
- A. free end
- B. fixed end
- C. L/3 sloping side
- D. none of these
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Assistant Director (Engineering -Mechanical) | 11.01.2019
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9 . A device which coverts chemical energy into electrical energy is called?
- A. Motor
- B. Generator
- C. Moving-col
- D. meter Battery
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10 . As the number of cylinders on multi cylinder engines increases the power to weight ratio
- A. Decreases
- B. Remains the same
- C. Increases
- D. Becomes zero
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Assistant Director (Engineering -Mechanical) | 11.01.2019
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11 . Determine power rating of an electric motor if it runs at 1440 rpm and line shaft transmits torque of 75 Nm. Assume Reduction ratio =1.6
- A. 10.36 kW
- B. 9.12kW
- C. 7.068kW
- D. 11.3 kW
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Assistant Director (Engineering -Mechanical) | 11.01.2019
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12 . Function of distribution sub-station is to:
- A. step-down voltage
- B. step-up voltage,
- C. increase power,
- D. increase engery
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পল্লী বিদ্যুতায়ন বোর্ড। এসিস্ট্যান্ট এনফোর্সমেন্ট কোঅডিনেটর। 31-12-2021
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13 . In a Diesel engine, during combustion the pressure may increase at a range of
- A. 55 - 75 atm
- B. 15 - 20 atm
- C. 10 - 15 atm
- D. 20 - 30 atm
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Assistant Director (Engineering -Mechanical) | 11.01.2019
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14 . Of the various non-conventional energy sources that are being tapped, which has the largest potential?
- A. water power
- B. wind power
- C. solar power
- D. biomass power
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15 . SMPS stands for-
- A. Switched Mode Power Supply
- B. Start Mode Power Supply
- C. State Mode Power Supply
- D. Single Mode Power Supply
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সমন্বিত পাঁচ ব্যাংক || অফিসার ক্যাশ - 06.11.2021
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