বাংলাদেশ পল্লী বিদ্যুতায়ন বোর্ড || সহকারী প্রকৌশলী (Civil/EEE/Mechanical) (23-02-2024)

1.

An instantaneous change in voltage is not possible in a/an -

resistor

inductor

Capacitor

current source

resistor

inductor

Capacitor

current source

2.

The critical gradient for all soils is normally -

0.5

1

1.5

২.৫

0.5

1

1.5

২.৫

3.

The highest point on road surface is called -

crown

camber

gradient

beam

crown

camber

gradient

beam

4.

What is the firing order of a four stroke I.C engine?

1-3-4-2

1-4-3-2

1-3-2-4

1-2-4-3

1-3-4-2

1-4-3-2

1-3-2-4

1-2-4-3

5.

A 4 pole generator with 16 coil has a 2-layer lap winding. The pole pitch is -

8

৪

১৬

32

8

৪

১৬

32

6.

The power density spectrum is a _____ function.

Square

Linear

Odd

Even

Square

Linear

Odd

Even

7.

The primary current in a CT is dictated by the -

secondary burden

core

load current

all

secondary burden

core

load current

all

8.

Which of the following equation must be perfunctorily satisfied while dealing with fluid flow problems?

Newton's third law

Law of concentration of momentum

Continuity equation

Newton's Second law

Newton's third law

Law of concentration of momentum

Continuity equation

Newton's Second law

9.

The normal consistency of Portland cement is about -

১০%

15%

২০%

২৫%

১০%

15%

২০%

২৫%

10.

The Laplace transform od unit step function is -

S

S^{2}

1

1/s

S

S^{2}

1

1/s

11.

The normal way to close a SCR is by appropriate ____ current.

gate

cathode

anode

forward

gate

cathode

anode

forward

12.

Which of the following is having the lowest value of overall heat transfer coefficient?

Feed water heaters

Air condensers

Air to low viscosity liquids

Steam condensers

Feed water heaters

Air condensers

Air to low viscosity liquids

Steam condensers

13.

Isentropic nozzle flow states about the movement of a gas or fluid through a narrow surface without an increase or decrease in-

Pressure

Energy

displacement

Entropy

Pressure

Energy

displacement

Entropy

14.

The blade friction in the impulse turbine reduces the velocity of steam by _____ while it passes over the blades.

10-15%

15-20%

20-30%

30-40%

10-15%

15-20%

20-30%

30-40%

15.

Which of the following causes irreversibility?

electrical resistance, magnetic hysteresis

inelasticity

friction, viscosity

All

electrical resistance, magnetic hysteresis

inelasticity

friction, viscosity

All

16.

The main criterion for selection of the size for a radial distribution system is-

capital loss

corona loss

temp rise

voltage drop

capital loss

corona loss

temp rise

voltage drop

17.

Wien bridge is used for the measurement of -

R

C

L

F

R

C

L

F

18.

Loop gain vs phase plot is known as ______ plot/chart.

Nyquist

Bode

Nichol's

Inverse Nyquist

Nyquist

Bode

Nichol's

Inverse Nyquist

19.

The main function of the construction management is -

Planning

Organizing

Directing

all

Planning

Organizing

Directing

all

20.

Proximity effect is due to current flowing in the

Earth

sheath

neighboring conductor

all

Earth

sheath

neighboring conductor

all

21.

"Dead slow" is a ___ sign.

regulatory

warning

informatory

None

regulatory

warning

informatory

None

22.

If P_m is the maximum power transferred, the loss on the system is

P_{m} / 4

P_{m} / 2

3 P_{m} / 4

P_{m}^{2} / 2

P_{m} / 4

P_{m} / 2

3 P_{m} / 4

P_{m}^{2} / 2

23.

The loss of head at exit of a pipe is -

$v^{2} / 2 g$

$0.5 v^{2} / 2 g$

$0.375 v^{2} / 2 g$

$0.75 v^{2} / 2 g$

$v^{2} / 2 g$

$0.5 v^{2} / 2 g$

$0.375 v^{2} / 2 g$

$0.75 v^{2} / 2 g$

24.

Which of the following is the result of a reduction in operating pressure in the Air refrigeration cycle?

decrease in C.O.P

always decreases

increase in C.O.P

no change in C.O.P

decrease in C.O.P

always decreases

increase in C.O.P

no change in C.O.P

25.

A person who is unaffected by emotions is called -

stoic

Pessimist

Optimist

henpecked

stoic

Pessimist

Optimist

henpecked

26.

The moisture content in timber for framework should not exceed-

৫%

১০%

15%

২০%

৫%

১০%

15%

২০%

27.

A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is -

87.8%

86.7%

88.26%

88.9%

87.8%

86.7%

88.26%

88.9%

28.

A rectangular channel has cross sectional area of 50 m² If the channel section is to be most economical, calculate the depth. Take Breadth = 10m .

10 M

5 m

8 m

12 m

10 M

5 m

8 m

12 m

29.

The characteristic impedance of a lossless transmission line -

\sqrt{L C}

\sqrt{L / C}

1 / \sqrt{L / C}

\sqrt{C / L}

\sqrt{L C}

\sqrt{L / C}

1 / \sqrt{L / C}

\sqrt{C / L}

30.

Modulus of resilience is defined as Resilience _____

at ultimate stress

per unit volume

at proportional limit

at elastic limit

at ultimate stress

per unit volume

at proportional limit

at elastic limit

31.

If the fault current is 2000A, the relay setting is 50% and CT ratio is 400:5, then what is the PSM value?

25

১৫

50

10

25

১৫

50

10

32.

The compressible flow is assumed to be ____

Adiabatic only

Isentropic only

Polytropic

a+b

Adiabatic only

Isentropic only

Polytropic

a+b

33.

The thickness of the parapet wall, on the valley side of the roadway, is usually kept as

20 cm

40 cm

60 cm

80 cm

20 cm

40 cm

60 cm

80 cm

34.

A steel bar of 5 mm is heated from 15° to 40° and it is free to expand. The bar will induce . . . . . . stress.

NO

Shear

tensile

compressive

NO

Shear

tensile

compressive

35.

To refrain from separation in subsonic nozzles, the expansion angle must not be more than ______

১০°

20°

৩০°

40°

১০°

20°

৩০°

40°

36.

Reflector in nuclear power plants

decreases

has no effect

increases

all

decreases

has no effect

increases

all

37.

When a 400V, 50Hz, 6-pole induction motor is rotating at 960 rpm on no-load, its slip is -

১%

২%

৩%

৪%

১%

২%

৩%

৪%

38.

An angle made by a survey line with the prolongation of the proceeding line, is known as ...... angle.

Direct

vertical

horizontal

deflection

Direct

vertical

horizontal

deflection

39.

Transformer connection at the sending end of a transmission line is usually -

star-star

delta-delta

star-delta

delta-star

star-star

delta-delta

star-delta

delta-star

40.

The inverse Fourier transform of the function $F (ω) = π & (ω) / j ω$ is

sin ωt

cos ωt

sin (t)

u (t)

sin ωt

cos ωt

sin (t)

u (t)

41.

The pH value of water for public supplies is limited from

2.5-6.5

৬.৫-৮

8-10.5

10.5-15

2.5-6.5

৬.৫-৮

8-10.5

10.5-15

42.

Hook's law holds good up to

yield point

Elastic limit

plastic limit

breaking point

yield point

Elastic limit

plastic limit

breaking point

43.

The frictional torque transmitted in a flat pivot bearing, considering uniform pressure is

1 / 2 \times μ . W . R

2 / 3 \times μ . W . R

3 / 4 \times μ . W . R

μ . W . R

1 / 2 \times μ . W . R

2 / 3 \times μ . W . R

3 / 4 \times μ . W . R

μ . W . R

44.

When a shaft is subjected to a twisting moment, every cross section of the shaft will be under _____ stress.

tensile

compressive

Shear

Bending

tensile

compressive

Shear

Bending

45.

The available energy of a system _____ as its temperature or pressure decreases and approaches that of the surroundings.

remains constant

increases

decreases

None

remains constant

increases

decreases

None

46.

The power input to an induction motor is 50 kW when it is running at 4% slip. If the stator resistance and core losses are neglected, the rotor copper loss is

30 kW

20 kW

2 kW

4 kW

30 kW

20 kW

2 kW

4 kW

47.

The thermal efficiency of diesel engines is about

65%

50%

80%

70%

65%

50%

80%

70%

48.

The speed regulation of a synchronous motor is always

১%

0.5%

80%

0

১%

0.5%

80%

0

49.

Human ear can detect sound intensities of the order of _____ W/m².

10^{- 20}

10^{- 13}

10^{- 6}

10^{- 3}

10^{- 20}

10^{- 13}

10^{- 6}

10^{- 3}

50.

In an ideal Op-Amp, the input impedance is -

০

50

Infinite

1

০

50

Infinite

1

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