100+ Free Junior Engineer Practice Questions

Pass your NHPC Junior Engineer Computer Based Test (Civil / Electrical / Mechanical / E&C) exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: Junior Engineer Exam

200 MCQs

Official CBT question count in 180 minutes

NHPC JE CBT scheme / Advt pattern

140 + 30 + 30

Discipline / GA / Reasoning split

NHPC JE examination scheme

+1 / −0.25

Marking for correct and wrong answers

NHPC CBT marking scheme

40% / 35%

Minimum CBT qualifying marks by category

NHPC JE selection process

₹708

Gen/EWS/OBC fee including taxes (Advt 04/2025)

NHPC Advt NH/Rectt./04/2025

NHPC JE: 200 MCQs / 180 min CBT (140 discipline + 30 GA + 30 reasoning), +1/−0.25, 40%/35% qualifying, CBT-only merit then DV. Fee ₹708 or exempt by category.

Sample Junior Engineer Practice Questions

Try these sample questions to test your Junior Engineer exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1The SI unit of electrical resistance is the ohm (Ω). One ohm is equal to:

A.1 V / 1 A

B.1 A / 1 V

C.1 W / 1 A

D.1 J / 1 C

Explanation: By Ohm's law, R = V/I. Therefore 1 Ω is the resistance that allows 1 A when 1 V is applied across it.

2Kirchhoff's Current Law (KCL) states that at any electrical node:

A.Algebraic sum of currents entering equals algebraic sum of currents leaving

B.Sum of voltage drops equals zero only in open circuits

C.Power consumed always equals zero

D.Resistance of all branches must be equal

Explanation: KCL is charge conservation at a node: sum of currents in equals sum of currents out (algebraic sum of all currents is zero).

3A resistor of 10 Ω carries a current of 2 A. The power dissipated in the resistor is:

A.40 W

B.20 W

C.5 W

D.12 W

Explanation: P = I^2 R = (2)^2 x 10 = 40 W. Equivalently P = VI with V = IR = 20 V gives 40 W.

4The RMS value of a sinusoidal AC voltage with peak value Vm is:

A.Vm / √2

B.Vm / 2

C.Vm × √2

D.2 Vm / π

Explanation: For a pure sine wave, Vrms = Vm/√2 ≈ 0.707 Vm. This is the effective DC-equivalent heating value.

5In a series R-L-C circuit at resonance, the impedance is:

A.Minimum and equal to R

B.Maximum and equal to XL

C.Equal to XL − XC only

D.Infinite

Explanation: At series resonance XL = XC, so net reactive impedance cancels and Z = R (minimum). Current is then maximum for a given supply voltage.

6The unit of magnetic flux is the weber (Wb). One weber equals:

A.1 volt-second

B.1 ampere-metre

C.1 newton

D.1 henry

Explanation: From Faraday's law e = -dφ/dt, so φ has units of volt·second. 1 Wb = 1 V·s.

7A single-phase transformer has primary voltage 230 V and turns ratio Np:Ns = 10:1. Neglecting losses, the secondary voltage is approximately:

A.23 V

B.2300 V

C.230 V

D.46 V

Explanation: Vp/Vs = Np/Ns, so Vs = Vp x (Ns/Np) = 230 x (1/10) = 23 V.

8In a three-phase star (Y) connection with line voltage VL, the phase voltage Vph is:

A.VL / √3

B.VL × √3

C.VL / 2

D.Equal to VL

Explanation: In star connection, VL = √3 Vph, hence Vph = VL/√3. Line current equals phase current.

9A Megger is primarily used to measure:

A.Insulation resistance

B.Earth resistance only by fall-of-potential

C.Power factor of a load

D.Frequency of supply

Explanation: A Megger (megohmmeter) applies a high DC test voltage to measure insulation resistance of cables, windings, and equipment.

10The synchronous speed of a 4-pole, 50 Hz three-phase induction motor is:

A.1500 rpm

B.3000 rpm

C.750 rpm

D.1000 rpm

Explanation: Ns = 120f/P = 120×50/4 = 1500 rpm. Rotor speed is slightly less due to slip.

About the Junior Engineer Exam

The NHPC Junior Engineer CBT is the merit exam for diploma-holder JE posts in Civil, Electrical, Mechanical, and Electronics & Communication. Per NHPC's non-executive scheme, candidates face 200 objective MCQs in 180 minutes (140 discipline + 30 General Awareness + 30 Reasoning) with +1/−0.25 marking. Minimum qualifying marks are 40% for Gen/OBC/EWS and 35% for SC/ST/PwBD. Selection is based on CBT merit followed by document verification and medical examination—there is no interview stage in the JE merit process. Application fee for Gen/EWS/OBC is ₹600 plus taxes (₹708 in Advt NH/Rectt./04/2025); SC/ST/PwBD/Ex-Servicemen/Female candidates are exempt. This free practice bank provides 100 exam-aligned questions weighted toward diploma technical topics.

Assessment

Part I Concerned Discipline 140; Part II General Awareness 30; Part III Reasoning Ability 30. +1 correct / −0.25 wrong. Duration 180 minutes.

Time Limit

180 minutes

Passing Score

Gen/OBC/EWS 40%; SC/ST/PwBD 35% minimum in CBT; final offer by CBT merit after DV

Exam Fee

Gen/EWS/OBC ₹708 (₹600 + taxes); SC/ST/PwBD/Ex-Servicemen/Female exempt (Advt NH/Rectt./04/2025) (NHPC Limited (Navratna CPSE))

Junior Engineer Exam Content Outline

70.00%

Concerned Discipline

Diploma-level Civil, Electrical, Mechanical, or E&C topics from the official NHPC JE syllabus

15.00%

General Awareness

National awareness and power-sector context at JE aptitude level

15.00%

Reasoning Ability

Verbal and non-verbal general intelligence and reasoning

How to Pass the Junior Engineer Exam

What You Need to Know

Passing score: Gen/OBC/EWS 40%; SC/ST/PwBD 35% minimum in CBT; final offer by CBT merit after DV
Assessment: Part I Concerned Discipline 140; Part II General Awareness 30; Part III Reasoning Ability 30. +1 correct / −0.25 wrong. Duration 180 minutes.
Time limit: 180 minutes
Exam fee: Gen/EWS/OBC ₹708 (₹600 + taxes); SC/ST/PwBD/Ex-Servicemen/Female exempt (Advt NH/Rectt./04/2025)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Junior Engineer Study Tips from Top Performers

1Spend most study time on your diploma branch—Part I is 140 of 200 marks.

2Practice numerical engineering problems in SI units; NHPC notes questions are set in SI units.

3Train for −0.25 negative marking; eliminate options before guessing.

4Keep a short daily GA + reasoning drill so the 60 non-technical marks stay secure.

5Use full-length timing (180 minutes) once weekly in the final month.

Frequently Asked Questions

What is the NHPC JE exam pattern?

The Computer Based Test has 200 MCQs in 180 minutes: 140 from the concerned diploma discipline, 30 General Awareness, and 30 Reasoning Ability, with +1/−0.25 marking.

Is there an interview for NHPC Junior Engineer?

No. For JE non-executive posts, NHPC selects on CBT merit (subject to minimum qualifying marks), then document verification and medical fitness.

What are the minimum qualifying marks?

Gen/OBC/EWS candidates need at least 40% in the CBT; SC/ST/PwBD candidates need at least 35%.

What is the application fee?

Under Advt NH/Rectt./04/2025, Gen/EWS/OBC pay ₹600 plus applicable taxes (₹708). SC/ST/PwBD/Ex-Servicemen/Female candidates need not pay the registration fee.

Who is eligible for NHPC JE?

Candidates with a full-time three-year regular Diploma in the relevant engineering branch meeting the percentage criteria. Higher BE/B.Tech without the prescribed diploma is not eligible.

Where is the official syllabus?

NHPC hosts an indicative CBT syllabus PDF for JE Civil/Electrical/Mechanical/E&C (and related non-executive posts) on nhpcindia.com under recruitment documents.

100+ Free Junior Engineer Practice Questions

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