DESCO Previous Exam Question Solution

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DESCO Previous Exam Question Solution:

Post Name And Vacancy:

1. Assistant Engineer (Technical)-38

2. Assistant Manager (Admin)-04

3. Sub -Assistant Engineer (Technical)-67

4. Junior Assistant Manager (Admin)- 07

5. Junior Assistant Manager (Finance & Accounts)- 20

6. Assistant Cable Jointer-02

7. Office Assistant- 17

8. Sub Station Attendant -28

9. Machine Operator- 02

10. Assistant Complaint Supervisor-22

11. Assistant Lineman-05

12. Receptionist-09

13. Electrician-02

14.Special Guard (KPI)- 04

15. Messenger-02

Total Vacancy: 229

Exam Date: 22 March 2019

Exam Time: 3:30 PM to 4:30 PM (1 hour exam)

Exam Taker: IBA, DU

Exam Type–MCQ.

আমাদের সমাধানের কোন অংশ কপি করা সম্পুর্ণ নিষিদ্ধ। কোন বাণিজ্যিক উদ্দ্যেশে আমাদের পোষ্ট শেয়ার করা যাবে না। কেউ ফেসবুকে গ্রুপে শেয়ার করতে চাইলে সমাধানের লিঙ্ক বা এর নাম কার্টেসী আকারে দিতে হবে।

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DESCO Exam Question Solution 2019

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DESCO recruitment test written Questions

Recruitment Test Question of Dhaka Electric Supply Company Limited (DESCO)
Post: All Subject
Time: unknown Full Marks: unknown
Exam Date: 12.12.2010 Venue: unknown

1. Why we use Y connection in alternator?

2. For the following circuit, prove that, f = 1/√ ( 1/L – R/L )
3. What is the maximum efficiency of 100 KVA transformer if core loss is 900W and full load copper
loss is 1600 W.
4. A battery is having 100 Ah capacity and 25% charge. If 10A load is continued for 6 hours then what is the final condition of the battery?
5. Differentiate between diode rectifier and thyristor rectifier.
6. What is biasing? Write down it’s significance.
7. What is back emf? Write down it’s significance.
8. If per primary winding voltage is 1V then what will be the per secondary voltage?
9. Why transformer is rated in KVA?
10. What is Ferranti effect?
11. When quality factor ά = 100, C=10 pF, then R=?
12. Define Real power, Reactive power and apparent power.
13. Without power factor meter, how can we measure the power factor of a circuit?
14. Why impedance is greater in AC rather than in DC?
15. We have 100A dc and 100A ac. Which will produce high heat and why?
16. What would be the minimum applied voltage at AB point:
17. Given that, I = , l= , B= . What will be the value of force, F ?
18. Draw the circuit diagram of florescent lamp and incandescent lamp.
19. When speed = 950 rpm, pole = 6, f = 50 Hz then slip = ?
20. Why glass insulators are more used than porcelain insulators?
21. What are tha advantages of underground cable?
22. Why low voltage side is short circuited in short circuit test?
Courtesy: Engr. Md. Towhidul Islam, B.Sc Engineer (CUET)


যেকোন পরীক্ষার প্রশ্ন এই ইমেইল পাঠালে আমরা সমাধান করে দেব।

Written Part

[Note: Questions serial may not match]

Q1. (i) Which type of JOIN is used to find not matched data from table?

(ii) In which keyword is used for retrieving data from table without duplicate row data?

(iii) What is the output of the following query –

        SELECT  *

         FROM myTbale

        WHERE id>0


(iv) Why indexing is used in database? How hash table works?

Q2.  Java Programming: Write a class named Bicycle and create a constructor of its and initialize the class member names cadense as Integer, gear as Integer speed as Integer. Write another class MountainBike and create also a constructor of its and add this field seatHeight as Integer and a method to set its from this class and extend Bicycle class.  

Q3. Write the output of the following program

#define MAX(A,B) ((A)>(B)) ? A:B

void main()

int i=1;

int j=2;

int val=max(++i,++j);



[Note: My written variable may not match]

Q4. Write a program in any programming language to find maximum number from given three numbers.

Q5. Write the output of the following program

int sum(int val)

static int myResult=0;

myResult += val;

return myResult;

void main(){

int i, value;




Q6. (i) Divide and Conquer method is used in

(a) Merge Sort

(b) Bubble Sort

(c) Quick Sort

(d) Both a & c

(ii) Dynamic programming approach is used to solve

(a) Dijkstra algorithm

(b) Kruskal’s Algoritm

(c) Prim’s Algorithm

(d) None of these

(iii) Binary search worst time complexity is 

(a) O(n)

(b) O(1)

(c) O(log n)

(d) O(n^2)

Q7. A company have a web based survey system where visitor browse the website login page. Only authorized visitor can access this survey system by using username and password. After login, visitor get a survey form and submit by filling the required information.

Now draw the use-case diagram of this web based survey system.

Q8. Drawing interface from following diagram


Now draw a interface of this system for the user in a convenient way from where user get proper instruction. 

Q9. IP related questions

Q10. Program analyzing and writing output

Q11. Fill out the table from given circuit

Q12. Describe different part of given microprocessor block diagram

Q13. Write the device name according to the given criteria. (This question is related with Router, Switch, Hub, Gateway)


MCQ Part : 60 Questions

[Note: Questions serial will not match. I just write up those here what I remembered]

Q1. Which countries prime minister has resigned after “Panama Papers” fallout?

(a) Belgium

(b) Korea

(c) Iceland

(d) Ireland


Q2. G-7  countries are UK, USA, Japan, France and

(a) Canada, Netherlands, Iceland

(b) Canada,Italy, Germany

(c) Italy, Netherlands, Chaina

(d) Germany, Italy, Netherlands


Q3. আরণ্যক কার লেখা ?

(a) শহীদুল্লাহ কায়সার

সকল চাকরির পরীক্ষার সময়সূচী ও ফলাফল মোবাইলে Notification পেতে নিচের Android apps মোবাইলে রাখেন: Jobs  EXam Alert 

(b) বিভূতিভূষণ বন্দোপ্যাধায়

(c) শরৎচন্দ্র চট্টোপাধ্যায়

(d) আহসান হাবীব


Q4. বেগম রোকেয়া রচিত

(a) শেষের কবিতা

(b) সুলতানার স্বপ্ন

(c) জীবনের গান

(d)  কোনটিই নয়


Q5. সঠিক বানান কোনটি

(a) মুমূর্ষু


(c) মুমূর্ষূ


Q6. আঞ্চলিক ভাষার আপর নাম

(a) উপভাষা

(b) চলিত ভাষা

(c) সাধু ভাষা

(d) কথ্য ভাষা


Q7. বাক্যে কমা অপেক্ষা বেশি থামার প্রয়োজন হলে কোনটি ব্যবহার করতে হয় ?
(a) সেমিকোলন
(b) কোলন
(c) হাইপেন
(d) দাঁড়ি


Q8. যে নারীর হাসি সুন্দর
(a) সূচিস্মিতা
(b) সুচিস্মীতা
(c) সুচিস্মিতা
(d) সুচীস্মিতা


Q9. Which is the faster Memory?

(a) RAM

(b) Secondary Memory

(c) DRAM

(d) Cache


Q10. Which is not a application software? 

(a) Redhat Linux

(b) MS Office

(c) Open Office

(d) Adobe illustrator


Q11. Microprocessor is used first in which generation computers? 

(a) Second Generation

(b) Third Generation

(c) Fourth Generation

(d) Fifth Generation


Q12. When we browse internet, browser store some data in the computer. We are talking about 

(a) Session

(b) File

(c) Memory

(d) Cookie


Q13. In client-server system what does the client program?

(a) Share data with other computer

(b) Serve information to others computer

(c) Control others connected computers

(d) Asked for information


Q14. What is the opposite word of accept

(a) Approve

(b) Boisterous

(c) Reject

(d) Elated


Q15. Who is the current president of FIFA?

(a) Daniel Burley Woolfall

(b) Rodolphe Seeldrayers

(c) Giovanni  Infantino

(d) Sepp Blatter






Courtesy: To all authorities from where documents are collected

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DESCO Previous Exam Question Solution:

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