RRB Junior Engineer Recruitment Exam Question Answers

1. Q: What is the main ingredient of cement?
   A: Limestone
2. Q: Which type of foundation is used for heavy structures on weak soil?
   A: Pile Foundation
3. Q: Which cement type is used for underwater construction?
   A: Portland Slag Cement
4. Q: The maximum water-cement ratio for reinforced concrete is:
   A: 0.45
5. Q: What is the slump test used for?
   A: Determining workability of concrete
6. Q: Which type of brick is suitable for foundation work?
   A: Engineering Brick
7. Q: The modulus of elasticity of concrete depends mainly on:
   A: Cement content and water-cement ratio
8. Q: Which soil is best for foundations?
   A: Gravel and Sand
9. Q: What is the function of a retaining wall?
   A: To prevent soil erosion or landslide
10. Q: The main purpose of reinforcement in concrete is:
    A: To resist tensile forces
11. Q: What is the ratio of cement, sand, and aggregate in standard concrete mix?
    A: 1:2:4
12. Q: The maximum temperature of concrete should not exceed:
    A: 32°C
13. Q: Which type of steel is used for reinforcement?
    A: Mild Steel or TMT Bars
14. Q: What is a cantilever?
    A: A projecting beam fixed at one end
15. Q: What type of arch is semicircular?
    A: Roman Arch
16. Q: The unit of moment of resistance in concrete beam is:
    A: kN·m
17. Q: What is the purpose of a damp-proof course (DPC)?
    A: To prevent rising of moisture
18. Q: Which type of cement is used in cold weather concreting?
    A: Rapid Hardening Cement
19. Q: The field test for checking quality of bricks is:
    A: Water Absorption Test
20. Q: The span of a simply supported beam is:
    A: Distance between two supports
21. Q: The standard thickness of plaster on walls is:
    A: 12–15 mm
22. Q: The basic component of mortar is:
    A: Cement and Sand
23. Q: Which type of load is permanent on a structure?
    A: Dead Load
24. Q: The purpose of expansion joints in concrete structures is:
    A: To absorb thermal expansion
25. Q: The permissible stress in mild steel is:
    A: 140–165 N/mm²

RRB Junior Engineer Recruitment Exam Question Answers -Electrical Engineering (25 Questions)

RRB Junior Engineer Recruitment Exam Question Answers for Electrical Engineers Listed below

26. Q: The SI unit of electric current is:
    A: Ampere
27. Q: What is the purpose of a transformer?
    A: To increase or decrease AC voltage
28. Q: Which type of motor is used in fans?
    A: Induction Motor
29. Q: Ohm’s law states that:
    A: V = IR
30. Q: What does a circuit breaker do?
    A: Protects electrical circuits from overcurrent
31. Q: A fuse protects a circuit by:
    A: Melting when current exceeds limit
32. Q: What is the unit of electrical resistance?
    A: Ohm
33. Q: The power factor of a purely resistive AC circuit is:
    A: 1
34. Q: What is the function of a relay?
    A: To operate a high-power circuit using low-power input
35. Q: The frequency of standard AC mains in India is:
    A: 50 Hz
36. Q: What is the purpose of a capacitor in AC circuit?
    A: To improve power factor
37. Q: Which type of motor has high starting torque?
    A: DC Shunt Motor
38. Q: Which material is used for electrical insulation?
    A: Bakelite or PVC
39. Q: The EMF induced in a conductor moving in magnetic field depends on:
    A: Speed of motion, magnetic field, and length of conductor
40. Q: Star-delta starter is used for:
    A: Starting induction motors
41. Q: The unit of electrical energy is:
    A: Kilowatt-hour (kWh)
42. Q: The main component of an electric generator is:
    A: Armature
43. Q: In a 3-phase system, voltage difference between two phases is:
    A: Line Voltage
44. Q: A transformer works on the principle of:
    A: Electromagnetic induction
45. Q: In a parallel AC circuit, voltage across each branch is:
    A: Same
46. Q: Which instrument measures current?
    A: Ammeter
47. Q: The function of a diode is:
    A: Allows current in one direction only
48. Q: Which motor is self-starting?
    A: Squirrel Cage Induction Motor
49. Q: The insulation resistance is measured by:
    A: Megger
50. Q: What is a rectifier?
    A: Converts AC to DC

Mechanical Engineering (25 Questions)

51. Q: What is the purpose of a governor in an engine?
    A: To regulate engine speed
52. Q: Which material is used for making boiler tubes?
    A: Steel
53. Q: What is the function of a clutch?
    A: To connect/disconnect power transmission
54. Q: What type of gear is used to transmit motion between non-parallel shafts?
    A: Bevel Gear
55. Q: Rankine cycle is associated with:
    A: Steam Power Plants
56. Q: What is the function of a flywheel?
    A: To store rotational energy
57. Q: The purpose of lubrication is:
    A: To reduce friction and wear
58. Q: What is the unit of torque?
    A: N·m
59. Q: The main purpose of a radiator in engines is:
    A: To remove excess heat
60. Q: A single-acting engine does work in:
    A: One direction of piston movement
61. Q: What is the function of a cam in a machine?
    A: Converts rotary motion to reciprocating motion
62. Q: Which type of bearing is used for high-speed shafts?
    A: Ball Bearing
63. Q: What is the efficiency of an ideal machine?
    A: 100%
64. Q: What is the main function of a boiler?
    A: To generate steam
65. Q: What is the purpose of a thermostat?
    A: To regulate temperature
66. Q: A gear ratio is defined as:
    A: Ratio of number of teeth on driving gear to driven gear
67. Q: The function of a piston ring is:
    A: Prevent leakage of gas
68. Q: Which type of energy is present in a moving object?
    A: Kinetic Energy
69. Q: What is the function of a coupling?
    A: To connect two shafts
70. Q: The main component of refrigeration cycle is:
    A: Compressor
71. Q: The unit of power in SI system is:
    A: Watt
72. Q: What is the purpose of a boiler mountings?
    A: To ensure safe operation
73. Q: Steam turbines work on which principle?
    A: Impulse or Reaction principle
74. Q: The ideal gas equation is:
    A: PV = nRT
75. Q: In a 4-stroke engine, number of strokes per cycle is:
    A: 4

General Science & General Awareness (25 Questions)

76. Q: Who is the current Chairman of the Railway Board?
    A: [Update latest info]
77. Q: What is the chemical formula of water?
    A: H?O
78. Q: The hardest natural substance is:
    A: Diamond
79. Q: Which gas is used in electric bulbs?
    A: Argon
80. Q: The national railway museum is located in:
    A: New Delhi
81. Q: Who invented the telephone?
    A: Alexander Graham Bell
82. Q: The capital of India is:
    A: New Delhi
83. Q: Which planet is known as the Red Planet?
    A: Mars
84. Q: The atomic number of Oxygen is:
    A: 8
85. Q: Who wrote the Indian National Anthem?
    A: Rabindranath Tagore
86. Q: The largest organ in human body is:
    A: Skin
87. Q: Speed of light in vacuum is approximately:
    A: 3 × 10? m/s
88. Q: Who discovered penicillin?
    A: Alexander Fleming
89. Q: Which is the largest planet in the solar system?
    A: Jupiter
90. Q: What is the boiling point of water at sea level?
    A: 100°C
91. Q: Which element is represented by symbol ‘Na’?
    A: Sodium
92. Q: The first railway line in India was between:
    A: Mumbai (Bori Bunder) – Thane
93. Q: The Earth revolves around the Sun in:
    A: 365 days
94. Q: The full form of ISRO is:
    A: Indian Space Research Organisation
95. Q: What is the SI unit of force?
    A: Newton
96. Q: Which is the national bird of India?
    A: Peacock
97. Q: Who is known as the father of Indian Railways?
    A: Lord Dalhousie
98. Q: Water expands on:
    A: Freezing
99. Q: Who wrote the book “India Wins Freedom”?
    A: Maulana Abul Kalam Azad
100. Q: Which gas is essential for respiration?
     A: Oxygen

RRB Junior Engineer Recruitment Exam 10 Sample Question Answers- Multiple Choice

1. Which of the following is a semiconductor material?

A) Copper
B) Silicon
C) Iron
D) Aluminum
Answer: B) Silicon

2. What is the unit of electrical resistance?

A) Ohm
B) Ampere
C) Volt
D) Farad
Answer: A) Ohm

3. In which year was the first railway line in India started?

A) 1853
B) 1857
C) 1862
D) 1875
Answer: A) 1853

4. Which of the following is used to convert AC to DC?

A) Transformer
B) Rectifier
C) Inductor
D) Oscillator
Answer: B) Rectifier

5. What does CPU stand for in computers?

A) Central Processing Unit
B) Control Process Unit
C) Central Programming Unit
D) Computer Process Utility
Answer: A) Central Processing Unit

6. Which of the following forces is responsible for the rotation of a fan?

A) Gravitational force
B) Magnetic force
C) Centrifugal force
D) Electric force
Answer: D) Electric force

7. The SI unit of power is:

A) Newton
B) Joule
C) Watt
D) Pascal
Answer: C) Watt

8. Which of the following is a renewable source of energy?

A) Coal
B) Petroleum
C) Solar energy
D) Natural gas
Answer: C) Solar energy

9. Which Indian organization conducts the Junior Engineer Recruitment Examination?

A) SSC
B) UPSC
C) RRB
D) DRDO
Answer: C) RRB (Railway Recruitment Board)

10. In civil engineering, cement and sand are mixed in what ratio for plastering?

A) 1:2
B) 1:3
C) 1:4
D) 1:6
Answer: C) 1:4

Key Highlights of the Exam

• Exam Mode: Computer-Based Test (CBT)
• Subjects Covered:
  • General Intelligence & Reasoning
  • General Awareness & Current Affairs
  • General Science & Engineering Concepts (Civil, Electrical, Mechanical)
• Duration: 90–120 minutes depending on the stage
• Marking Scheme: Positive and negative marking included

RRB Junior Engineer Recruitment Exam – Sample Questions and Answers

Here are some important questions that appeared in recent RRB JE exams, along with answers:

1. General Awareness Question

Q: Who is the current Chairman of the Railway Board?
A: [Answer with latest information]

2. General Science Question

Q: What is the main function of a transformer?
A: To increase or decrease AC voltage levels.

3. Civil Engineering Question

Q: Which type of foundation is preferred for heavy structures on weak soil?
A: Pile foundation.

4. Electrical Engineering Question

Q: What does an insulator do in an electric circuit?
A: It resists the flow of electric current, providing safety.

5. Mechanical Engineering Question

Q: What is the purpose of a governor in an engine?
A: To regulate the engine speed automatically.

(Add 10–15 more questions in a similar format depending on your post length.)

Tips for Preparing RRB JE Exam

1. Understand the syllabus thoroughly – Focus on Civil, Electrical, and Mechanical Engineering core topics.
2. Practice previous year question papers – Helps in understanding the question pattern.
3. Time management – Attempt questions wisely; avoid spending too much time on one.
4. Revision – Regularly revise formulas, concepts, and current affairs related to Railways.
5. Mock Tests – Take online mock tests to improve speed and accuracy.