DPDC SAE (Electrical) Model question

DPDC SAE (Electrical) Model (70 Marks).
এখানে বুয়েট ফরম্যাটে যে জব এক্সাম হয় তার একটি ফরম্যাট করা হয়েছে। এই মডেল SAE (Electrical) দের জন্য করা হয়েছে। বুয়েটে যে সব এক্সাম হয় সেখানে সাধারণত ডিপার্টমেন্ট থেকে ৭০ নম্বর এর প্রশ্ন হয় যার মধ্যে ৫০ নম্বর লিখিত প্রশ্নে এবং ২০ নম্বর MCQ, শূন্যস্থান এর হয়। তার একটি মডেল এখানে দেয়া হল, আশা করছি অনেকের উপকারে আসবে।
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Board (10×5 =50 Marks)
1. Find The Value It & Rt

dpdc-sae-1

Fig-1


2. A coil having a resistances of 10Ω and an inductance of 0.2H is connected in series with a capacitor of 59.7µF. The circuit is connected across a 100 V, 50Hz A.C supply. Calculate (a) the current following (b) the voltage across the capacitor (c) the voltage across the coil.

3. A 400V, 10hp, 4 pole, 50Hz, Y-connected induction motor operates at full load speed of 5%. Determine the synchronous speed, rotor speed and shaft torque at this operating condition.

4. A circuit breaker is rated as 1500 A, 1000 MVA, 33 kV, 3-second, 3-phase oil circuit breaker. Find (i) rated normal current (ii) breaking capacity (iii) rated symmetrical breaking current (iv) rated making current (v) short-time rating (vi) rated service voltage.

5. Draw single line diagram of power system.

6. A power station has a maximum demand of 15000 kW. The annual load factor is 50% and plant capacity factor is 40%. Determine the reserve capacity of the plant.

7. A 132 kV transmission line has the following data: Wt. of conductor = 680kg/km, Length of span = 260m, Ultimate strength = 3100kg, Safety factor = 2, Calculate the height above ground at which the conductor should be supported. Ground clearance required is 10 meter.

8. A power station has a maximum demand of 15000 kW. The annual load factor is 50% and plant capacity factor is 40%. Determine the reserve capacity of the plant.

9. Draw full wave bridge rectifier circuit with input and output wave.

10. Assuming an Ideal Op-Amp find the IL of the circuit?

DPDC Model SAE elec

Fig-2

Dept: MCQ-20

1.The resistivity of a wire depends on ____.
A. length
B. material
C. area of cross- section
D. all of the above.

2. One coulomb passing a point in one second is one:
A. Ampere
B. Volt
C. Ohm
D. Charge

3. The current sensitivity of meter is expressed in
A. Ampere
B.Ohm/ampere
C.Ohm/volt
D. Ampere/division

4. A device that is used to break an electric circuit is called_
A. fuse
B. switch
C. insulator
D. pole

5. Which of the following connection is best suited for 3 phase 4 wire service?
A. Delta-Delta
B. Delta-Star
C. Star-Delta
D. Star-Star

6. The rotor of an alternator has ……… slip rings for DC supply.
A. 2
B. 4
C. 6
D. 8

7. In an ideal transformer,
A. windings have no resistance
B. core has no losses
C. core has infinite permeability
D. all of the above.

8. Which of the following is not a basic element of a transformer ?
A. core
B. primary winding
C. secondary winding
D. mutual flux.

9. Which of the following is not a good conductor of electricity??
A. mercury
B. copper
C. plastic
D. aluminum foil

10. Which of the following has positive temperature coefficient ?
A. Germanium.
B. Gold
C. Paper
D. Rubber

11. Which of the following does not change in a transformer ?
A. Current
B. Voltage
C. Frequency
D. All of the above.

12. Speed of dc motor increases then back emf will be
A. increased
B. decreased
C. constant
D. none of above.

13. The number of oscillations completed in 1 second is called___
A. time period
B. velocity
C. frequency
D. wavelength.

14. Over-current protection for motor is provided by
A. cartridge fuses
B. high resistance fuses
C. over-current relay
D. all of the above

15. What is the name of the winding from which the supply is taken for load connections?
A. Primary winding
B. Secondary winding
C. Both
D. None of above

16. Which resistive component is designed to be temperature sensitive?
A. Thermistor
B. Rheostat
C. Potentiometer
D. Photoconductive cell

17. In a pnp transistor, the major carriers in the emitter are
A. Free electrons
B. Holes
C. Neither
D. Both

18. Zener diode is used as the main component in dc power supply for:
A. Rectification
B. Voltage regulation
C. Filter action
D. all of above.

19. Which of the following is not a transmission medium?
A. Telephone lines
B. Coaxial cables
C. Modem
D. Microwave systems

20. Which of the following sets represents a universal logic family?
A. NAND
B. XOR
C. AND
D. None of the above.

এই মডেল প্রশ্ন-উত্তরটি জাস্ট একটা ধারনা। এখান থেকে কোন প্রশ্ন হুবুহ আসবে এরকম মনে করে এক্সাম এর প্রস্তুতি নিবেন না। এক্সাম এর জন্য এই মডেল একটি সহায়ক হতে পারে। আরও ভাল প্রস্তুতি নেয়া প্রয়োজন।

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