16 . What is the typical battery voltage used in electric rickshaws in Bangladesh?

A. 12V
B. 24V
C. 48V
D. 72V

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Answer: Option C

Explanation:

The most typical battery voltage for electric rickshaws in Bangladesh is 48V, achieved by connecting four 12V lead-acid batteries in series. While some models may use 60V or 72V systems, 48V is the most common voltage for the main motor and is considered an industry standard.

48V: This is the most common voltage, achieved by linking four 12V batteries. It is widely used for passenger and cargo electric rickshaws.
60V: Some models, often referred to as "easy bikes," utilize a system with five 12V batteries for a 60V setup.
72V: Systems with a 72V configuration are also available and offer higher performance but are less common than 48V systems.

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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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Answer: Option D

Explanation:

The speed of an induction motor can be controlled by varying supply frequency and voltage.

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A. 100MW
B. 150MW
C. 310MW
D. 230MW

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Answer: Option D

Explanation:

The Kaptai Dam, the sole hydroelectric power station in Bangladesh, has an installed capacity of 230 megawatts. This capacity is generated by seven units across the Karnafuly River.

Installed Capacity: 230 megawatts (MW).
Location: Kaptai, Rangamati District, on the Karnafuly River.
History: Established in 1962, it was Bangladesh's first and only hydroelectric facility at the time.

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19 . The reactance of a capacitor at 50Hz is $5 Ω$ . If the frequency is increased to 100Hz, the new reactance is:

A. $5 Ω$
B. $10 Ω$
C. $12.5 Ω$
D. $2.5 Ω$

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Answer: Option D

Explanation:

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A. Frequency and phase modulation
B. Phase and Pulse modulation
C. Amplitude and frequency modulation
D. Amplitude and Pulse modulation

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Answer: Option C

Explanation:

For TV telecasting, the combination of modulation techniques used is Amplitude Modulation (AM) for video and Frequency Modulation (FM) for audio.

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A. Buchholz relay
B. Overload relay
C. Thermal relay
D. Distance relay

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Answer: Option D

Explanation:

The relay commonly used for the protection of transmission lines is the Distance relay.

Explanation:

Distance relays are designed to detect faults on transmission lines based on the impedance of the fault. They can quickly isolate the faulted section of the line, minimizing damage and preventing further propagation of the fault. This makes them ideal for high-voltage AC transmission lines and distribution lines.

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A. lightly doped p and n regions with narrow depletion layer
B. lightly doped p and n regions with wide depletion layer
C. heavily doped p and n regions with narrow depletion layer
D. heavily doped p and n regions with wide depletion layer

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Answer: Option A

Explanation:

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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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Answer: Option A

Explanation:

A net-metering system in a solar PV allows you to export excess electricity to the grid.

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A. Excessive rainfall
B. Lack of communication infrastructure
C. Too many substations
D. Abundant power supply

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Answer: Option B

Explanation:

The most critical challenge for smart grid deployment in rural Bangladesh is lack of communication infrastructure.

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A. Air gap
B. Laminated core
C. Insulation
D. Copper winding

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Answer: Option B

Explanation:

The part of a transformer used to reduce eddy current loss is the laminated core.

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26 . For a coil, L=5H and R = $20 Ω$ IF 100V is applied across the coil, the energy stored in the magnetic field, when current reaches its maximum value, is:

A. $60 j$
B. $65.5 j$
C. $62.5 j$
D. $68 j$

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Answer: Option C

Explanation:

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A. Gate current = ∞
B. Gate current = 0
C. Gate current =-∞
D. It is independent of gate current.

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Answer: Option B

Explanation:

The forward breakover voltage of a thyristor is maximum when Gate current = 0. A higher gate current lowers the forward breakover voltage, while a zero gate current (gate circuit open) results in the highest possible forward breakover voltage for the device.

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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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Answer: Option A

Explanation:

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29 . What is the maximum possible range of bitcount specifically in n-bit binary counter consisting of 'n' number of flip-flops?

A. $0 t o 2^{n}$
B. $0 t o 2^{n} + 1$
C. $0 t o 2^{n} - 1$
D. $0 t o 2^{n + \frac{1}{2}}$

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Answer: Option C

Explanation:

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A. +37
B. -31
C. +15
D. -27

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Answer: Option D

Explanation:

Since the original number was negative, the corresponding decimal number is -27.

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16 . What is the typical battery voltage used in electric rickshaws in Bangladesh?

17 . The speed of an induction motor can be controlled by:

18 . The Kaptai Dam, the only hydroelectric power station in Bangladesh, has an installed capacity of:

20 . TV programs are telecast using a combination of modulation techniques. Which of the following combination is used?

21 . Which relay is commonly used for the protection of the transmission lines?

22 . Zener diodes have:

23 . A net-metering system in a solar PV allows:

24 . Which of the following challenges is most critical for smart grid deployment in rural Bangladesh?

25 . Which part of the transformer is used to reduce eddy current loss?

27 . For a thyristor, the forward breakover voltage is maximum when:

28 . The maximum power point tracking (MPPT) in a solar system is used to:

30 . For 11100101 (in 2's complement form), the corresponding decimal number is:

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