pgcb exam 2015

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Page No- 1 PGCB-Assistant Engineer Requiting Exam-2015 Venue - BUET (15-05-2015) Friday @ 10:00-11am. Collected by- MAP. Fill the circle or put ( ) Mark on the circle of the Top Page. MCQ 60x0.5=30 1. When Ice floating in a glass of water melts the level of water will- a) Increase b) Decrease c) Remain Constant d) First increase than decrease. 2. If earth stops rotating the impact of weight of a body will be minimum in which among the following places- a) Equator b) North Plate c) Tropic of center d) Tropic of Capricorn 3. Silk is produced by- a) Egg of Silkworm b) Pupa of silkworm c) Larva of Silkworm d) Insects itself 4. Which country has adopted “Bengali” language the status of second state language- a) Sierra Leone b) South Africa c) Ivory coast d) Japan 5. Which of the following Environmentalists first gave the concept of Biodiversity „hotspots‟? a) Gaylord Nelson b) Norman Myers c) John Muir d) Julia “Butterfly” Hill 6. Washing soda is the common name for a) Calcium carbonate b)Calcium bicarbonate c) Sodium carbonate d) sodium bicarbonate 7. Which among the following country is inside the European Union but outside the Euro zone? a) Slovakia b) Slovenia c) Spain d) Denmark 8. Which of the following type of Coal has maximum carbon content? a) Peat b) Lignite c) Bituminous d) Anthracite 9. Which of the following parts of the sun is easily visible only during a total solar eclipse? a) Core b) Photosphere c) Sunspots d) Corona 10. Who is the founder of Charukola Institute of Dhaka University? a) Mazharul Islam b) Abdur Razzak c) Shamim Shikder d) Masum Ahmed 11. Any moving object on earth finally comes to rest due to which among the following? a) Gravity b) Friction c) Inertia d) Momentum 12. Who is the administrative chief of any ministry of Government of Bangladesh? a) Minister b) State Minister c) Secretary d) Additional Secretary 13. Spinach leaves are rich source of a) Iron b) Vitamin A c) Carotene d) Vitamin E 14. Bangladesh University of Engineering was established- a) 1950 b) 1961 c) 1960 d) 1954 15. ESCAP stands for- a) European Society Council for Africa and Pacific b) Economic and Social Commission for Africa and Pacific c) Economic and Social Commission for Asia and Pacific d) None of the above

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PGCB exam 2015

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  • Page No- 1

    PGCB-Assistant Engineer Requiting Exam-2015 Venue - BUET (15-05-2015)

    Friday @ 10:00-11am. Collected by- MAP.

    Fill the circle or put ( ) Mark on the circle of the Top Page. MCQ 60x0.5=30

    1. When Ice floating in a glass of water melts the level of water will-

    a) Increase b) Decrease c) Remain Constant d) First increase than decrease.

    2. If earth stops rotating the impact of weight of a body will be minimum in which among the following

    places-

    a) Equator b) North Plate c) Tropic of center d) Tropic of Capricorn

    3. Silk is produced by-

    a) Egg of Silkworm b) Pupa of silkworm c) Larva of Silkworm d) Insects itself

    4. Which country has adopted Bengali language the status of second state language-

    a) Sierra Leone b) South Africa c) Ivory coast d) Japan

    5. Which of the following Environmentalists first gave the concept of Biodiversity hotspots?

    a) Gaylord Nelson b) Norman Myers c) John Muir d) Julia Butterfly Hill

    6. Washing soda is the common name for

    a) Calcium carbonate b)Calcium bicarbonate c) Sodium carbonate d) sodium bicarbonate

    7. Which among the following country is inside the European Union but outside the Euro zone?

    a) Slovakia b) Slovenia c) Spain d) Denmark

    8. Which of the following type of Coal has maximum carbon content?

    a) Peat b) Lignite c) Bituminous d) Anthracite

    9. Which of the following parts of the sun is easily visible only during a total solar eclipse?

    a) Core b) Photosphere c) Sunspots d) Corona

    10. Who is the founder of Charukola Institute of Dhaka University?

    a) Mazharul Islam b) Abdur Razzak c) Shamim Shikder d) Masum Ahmed

    11. Any moving object on earth finally comes to rest due to which among the following?

    a) Gravity b) Friction c) Inertia d) Momentum

    12. Who is the administrative chief of any ministry of Government of Bangladesh?

    a) Minister b) State Minister c) Secretary d) Additional Secretary

    13. Spinach leaves are rich source of

    a) Iron b) Vitamin A c) Carotene d) Vitamin E

    14. Bangladesh University of Engineering was established-

    a) 1950 b) 1961 c) 1960 d) 1954

    15. ESCAP stands for-

    a) European Society Council for Africa and Pacific

    b) Economic and Social Commission for Africa and Pacific

    c) Economic and Social Commission for Asia and Pacific

    d) None of the above

  • Page No- 2

    16. Evaluate the following limit

    a) - b) -3/4 c) 0 d)

    17. What is the radius of a sphere with a center at the origin and that passes through the point (8, 6, 1)

    a) 10 b) 65 c) 101 d) 100

    18. Which of the values of A that satisfies the expression: A-6/8 = 0,001?

    a) 10 b) 100 c) 1000 d) 10000

    19. What is the Laplace transform of e-at ?

    a) 1/a b) 1/(s+a) c) a/s d) 1/(s-a)

    20. If 2x is 32, what is x2 ?

    a) 5 b) 10 c) 25 d) 100

    21. How much longer in second, is required to drive 1mile at 40mph than at 60 mph?

    a) 5 b) 10 c) 20 d) 30

    22. Which one of the following in NOT a computer language

    a) MS-Excel b) BASIC c) COBOL d) python

    23. The scrambling of code is known as:

    a) Encryption b) a firewall c) Scrambling d) Password proofing

    24. If the sums of three consecutive integers is less than 75, what is the greatest possible value of the

    smallest one?

    a) 23 b) 24 c) 25 d) 26

    25. What does DMA stand for

    a) Distinct Memory Access

    b) Direct Memory Access

    c) Direct Module Access

    d) Direct Memory Allocation

    26. Programs stored in ROM are called

    a) Hardware b) Software c) Firmware d) None of these

    27. A fair coin is flipped three times. What is the probability that coin lands head each time?

    a) 1/2 b) 1/3 c) 1/4 d) 1/8

    28. ATM stands for

    a) Automatic Talking Machine

    b) Automatic Teller Machine

    c) Analog Teller Machine

    d) Automatic Ticketing Machine

    29. A list of instructions used by a computer is called

    a) Text b) CPU c) program d) output

    30. Which of the following computer memory has shortest access time?

    a) Secondary b) c) d) Cache memory

  • Page No- 3 wbPi AskUzKz co 31 bs nZ 37 bs cki Di w`b:

    Kx Awfgvb exiek cwiZvM Kwiqv wfLvixi ek aviY KwiqvQ? DPc` jvf KwiqvI wK Zvgvi wPi bxP fve hvq bvB? Rxebi GZ

    cwZK~jZv cvi nBqvI wK Zzwg wKQz wkwLqv jI bvB? wQ: wQ: mbvcwZi GB Kvh? ej Zv, AvR Kvb Kzmyg-Kvbbi czwUZ KgjQ

    mKj Mvcb nib Kwiqv Qekx nBj? Kx Awfcvq A gwjb emb, gyL PzbKvwj `Iqv, wfvi Szwj, wkI RxY AviY? GZ

    KcUZv Kvnvi Rb?

    31. cvi nBqv Gi PwjZic wK?

    a) AwZg Ki b) cvi nBq c) cvi nq d) cwiq

    32. AvR Kvb Kzmyg-Kvbbi czwUZ KgjQ mKj Mvcb nib Kwiqv Qekx nBj? GLvb Kzmyg Kvbbi Kvb KviK?

    a) Kg b) KiY c) Acv`vb d) AwaKiY

    33. wbPi KvbwU fzj evbvb?

    a) cwZK~jZv b) nib c) Qekx d) emb

    34. GLvb gyL PzbKvwj `Iqv A_ wK?

    a) Pnviv cwieZb b) fvb Kiv c) AKgY d) Kj jcb

    35. DwZZ DjwLZ ewi wfvi Szwj Kb?

    a) Mixe nIqvi KviY b) cvci KviY c) cwiPq Mvcb Kivi KviY d) Awfgvb

    36. DwZZ DjwLZ ewi cwiPq wK?

    a) Awfgvbx b) f I a~Z c) DPc` KgPvix d) wfLvix

    37. KgjQ mKj Kv_vq dzuU?

    a) mivei Rj b) Av Kvbb c) Mvjvc evMvb d) gwjb emb

    38. gxi gkviid nvmbi iwPZ welv` wmz wK aiYi M?

    a) b) ce c) Kve d) gb Kvwnbx

    39. weavZv w`Qb cvY- _vwK m`v wqgvb- kw gi fxwZi Kej- cvQ jvK wKQz ej- GLvb wqgvb ki A_ wK?

    a) welv` M b) ^Z:dzZ c) wavnxb d) mskqM

    40. KvK evsjv fvlvi Pj wekKvl ejv nZ?

    a) KvRx gvZvnvi nvmb b) gvwbK K`vcvavq c) kirP` Pvcvavq d)

    41. KvRx bRij Bmjvg Kvb Rjvq RbMnb Kib?

    a) KvjKvZv b) gqgbwmsn c) d) Pwek ciMbv

    42. G RMZ nvq, mB ekx Pvq AvQ hvi fzwi fzwi- ivRvi n Ki mg KvOvji ab Pzwi KwiZvskwU Kvi jLv?

    a) KvRx bRij Bmjvg b) c) iwdK AvRv` d) Rwmg Dwb

  • Page No- 4

    43. wbPi KvbwU ejxqvb ki mw weQ`?

    a) ej+Bqvb b) ejx+Avb c) ej+Avqvb d) ej+Cqvb

    44. wbPi KvbwU LuvwU evsjv k?

    a) ivw b) Avmeve c) Kqjv d) wmbgv

    45. wbPi KvbwU Abqx Aeq c`?

    a) A_ev b) gwi gwi c) bPr d) kb kb

    Question (46-60): For each question select the preposition(s) that most appropriately fill(s) in the gap.

    46. Please be true .. your word

    a) to b) for c) on d) at

    47. Nasimas passion ..music is well known.

    a) for b) to c) on d) at

    48. Farida is very loyal her grandmother.

    a) with b) to c) for d) on

    49. Professor Hassan is overwhelmed.. grief at his mothers death

    a) to b) with c) for d) at

    50. Invitation was limited .. teachers only.

    a) for b) with c) to d) on

    51. Poverty is an obstacle .. higher studies.

    a) on b) with c) to d) at

    52. Maheer is unequal . The task.

    a) on b) for c) with d) to

    53. Alberuni is in need money.

    a) for b) to c) from d) of

    54. Ferdousi is qualified the post of teacher.

    a) to b) on c) at d) for

    55. Rumi is zealous (eager) freedom.

    a) for b) to c) with d) on

    56. Ehsanul kabir was marred a pretty girl.

    a) to b) with c) at d) for

    57. We wondered his ignorance.

    a) to b) at c) with d) for

    58. He is suspicious . my motive.

    a) to b) of c) on d) with

    59. He is a victim .. the earthquake disaster.

    a) with b) to c) of d) on

    60. Students should be respectful . their teachers.

    a) with b) at c) to d) on

  • Page No- 5

    Section B Questions for Electrical and Electronic Engineering

    Section B has 13 questions

    Answer the following questions.

    1.Tick the most appropriate answer: (22x1=22)

    i) The output efficiency and voltage regulation at the condition of maximum power transfer of a circuit,

    respectively, are

    a) 50% and 50% b) 100% and 50% c)50% and 100% d) 100% and 100%

    ii) At what frequency will the output voltage vo(t) in the following figure be equal to the input

    voltage v(t)?

    a) 0 rad/s b) 1 rad/s

    b) c) rad/s d) None

    iii) Under a reverse-bias, the majority carriers in a p-n junction

    a) Moves toward the junction b) Moves away from the junction

    c) None of the above d) Indeterminate

    iv) Input impedance of an OP-AMP is

    a) Very low b) very high c) moderate d) zero

    v) The maximum collector efficiency of a class-B power amplifier is

    a) 25% b) 50% c) 78.5% d) 60%

    vi) For a full wave rectifier circuit the diodes should be so chosen that

    a) The peak inverse voltage must be higher than the break down voltage of the diodes

    b) The peak inverse voltage must be lower than the break down voltage of the diodes

    c) The peak inverse voltage must be nearly equal to the break down voltage of the diodes

    d) The peak inverse voltage cannot be related to the break down voltage of the diodes

    vii) In telephone systems load is expressed in the unit of

    a) Erlangs b) decibels c) bells d) watts

    viii) A cordless telephone using separate frequencies for transmission in bae and portable units is

    known as

    a) Duplex arrangement b) half duplex arrangement

    c) either (a) or (b) d) neither (a) or (b)

    ix) A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10000

    in one hour, the calling rate is

    a) 0.9 b) 10/9 c) 0.81 d) 0.1

  • Page No- 6

    x) In FM guard band is provided

    a) to limit upper frequency limit

    b) to limit lower frequency limit

    c) so that there is less adjacent channel interference

    d) to limit transmitted power of a station

    xi) Two massages m1, m2 have a probability of 0.5 each. The entropy is

    a) 0.25 b) 0.5 c) 0.75 d) 1

    xii) The main function of a fuse is to

    a) Protect the line b) Open the circuit c) Protect the appliance d) Prevent excessive currents

    xiii) Synchronous motor can operate at

    a) Lagging power factor d) Leading p.f only c) Unity p.f only d) All of the above

    xiv) The damping winding in a synchronous motor is generally used

    a) To provide starting torque only b) to reduce noise level

    c) To reduce eddy currents d) To prevent hunting and provide the starting torque

    xv) In DC generator, the electricity produced in armature is

    a) DC b) AC c) Armature is not present in DC generator d) None

    xvi) A thermal protection switch can protect against

    a) Short-circuit b) Temperature c) Overload d) Over voltage

    xvii) The arc voltage produced in circuit breaker is

    a) Leading the arc current by 90 degree

    b) Lagging the arc current by 90 degree

    c) In phase with the arc current

    d) In phase opposition to the arc current

    xviii) When a 200 load resistor is connected across the secondary winding of a transformer with a

    turns ration of 4, the source sees a reflective load of

    a) 50 b) 12.5 c) 800 d) 3200

    xix) The magnetizing inrush current in an unloaded transformer is maximum when the switch is closed

    with the voltage passing through

    a) Zero b) positive maximum c) negative maximum d) all of the above

    xx) Potential across the various discs of suspension type insulator is different because of

    a) Series capacitance b) shunt capacitance c) tower height d) none of these

    xxi) Most of the faults in a power system are

    a) Three phase fault b) double line to ground fault c) line to ground fault d) both a and c

    xxii) Transformers are rated in KVA instead of KW because

    a) Load power factor is often not known

    b) KVA is fixed whereas KW depends on load power factor

    c) Total transformer loss depends on volt ampere

    d) It has become customary

  • Page No- 7

    2. Determine Req in the following circuit.

    3. The switch in the following circuit has been closed for a long time, and it is opened at t=0. Find v(t)

    for t 0.

    4. Calculate the output voltage of the following amplifier. Input signals are V1= 0.3Cost and

    V2= 0.2 Cost.

    5. For the NMOS shown below, show the input output connections for i) Common Gate ii) Common

    Drain and iii) Common Source Amplifier

  • Page No- 8

    6. Draw the spectrum of x(t) of the system shown below

    7. Find the characteristic equation for the system in the following figure.

    8. What is meant by load angle of an Alternator? Upon what factors does the load angle depend?

    9. How do the synchronizing lamps indicate the correctness of phase sequence?

  • Page No- 9

    10. Why s synchronous motor is a constant speed motor?

    11. A 3-phase, 50Hz, 400V motor develops 74.6kW, the power factor being 0.75 lagging and efficiency

    93%. A bank of capacitors is connected in delta across the supply terminals and power factor raised

    to 0.95 lagging. Determine the kVAR rating of the capacitors connected in each phase.

    12. Draw a diagram for a biased differential protection scheme for unit connection.

    13. The sending end voltage of a transmission line as a function of receiving end voltage and is expressed

    as following .

    Vs=AVR+BIR

    Let, A=|A|