Bharat Electronics Limited (BEL), a Navratna Defence Public Sector Undertaking (PSU) under the Ministry of Defence, conducts recruitment exams every year for the post of Probationary Engineer (E-II Grade) in various disciplines such as Electronics, Mechanical, Electrical, and Computer Science.
The BEL Probationary Engineer exam tests candidates on core engineering knowledge along with general aptitude, designed to evaluate their technical competence and analytical ability for engineering roles in Defence and R&D projects.
? BEL Probationary Engineer Sample Questions with Answers
Below are some important sample questions with answers to help candidates understand the type and difficulty level of the BEL E-II Grade Recruitment Exam.
? Electronics Engineering
Q1. The function of a Zener diode in a circuit is to — A. Rectify AC B. Regulate voltage ? C. Amplify signals D. Filter noise
Explanation: Zener diodes operate in reverse breakdown mode to maintain constant voltage across the load.
Q2. The modulation index of an AM wave is 0.5. If carrier power is 100 W, total power is — A. 112.5 W ? B. 125 W C. 150 W D. 100 W
?? Mechanical Engineering
Q3. The efficiency of an ideal Otto cycle depends on — A. Compression ratio ? B. Expansion ratio C. Fuel used D. Temperature
Q4. The area under the stress–strain curve represents — A. Elasticity B. Strength C. Toughness ? D. Hardness
? Electrical Engineering
Q5. The power factor of a purely resistive circuit is — A. 0 B. 0.5 C. 1 ? D. –1
Q6. Laminating the core of a transformer is done to — A. Reduce hysteresis loss B. Reduce eddy current loss ? C. Improve insulation D. Reduce weight
? Computer Science Engineering
Q7. Which data structure is used for recursion? A. Queue B. Stack ? C. Linked list D. Array
Q8. Which sorting algorithm has the best average-case time complexity? A. Bubble Sort B. Merge Sort ? C. Insertion Sort D. Selection Sort
? General Aptitude
Q9. A train 180 m long crosses a platform 120 m long in 9 seconds. Find its speed. A. 60 km/h B. 80 km/h C. 120 km/h ? D. 100 km/h
Q10. The synonym of “Eloquent” is — A. Silent B. Fluent ? C. Harsh D. Weak
? Preparation Tips for BEL Probationary Engineer Exam
Focus on GATE-level concepts — BEL questions are usually similar in depth but slightly simpler.
Revise basic formulas and problem-solving techniques for each core subject.
Practice previous BEL papers and timed mock tests.
Improve your speed and accuracy in solving numerical questions.
Work on communication and interview skills for the final stage.
? Why Practice Question Sets Matter
Practicing with BEL-style MCQs improves familiarity with the pattern, boosts confidence, and helps identify weak areas. Candidates preparing for the BEL E-II Grade exam are advised to go through topic-wise question banks and take at least 5 full-length mock tests before the actual exam.
