SSC JE Electrical Engineering MCQs

SSC JE Electrical Engineering (EE) MCQs are an essential part of preparation for candidates appearing in the Junior Engineer examination conducted by the Staff Selection Commission. These multiple choice questions help aspirants strengthen their technical knowledge, improve accuracy, and understand the exam pattern in a structured way.

The SSC JE EE exam mainly focuses on core electrical engineering subjects along with general awareness, reasoning ability, and quantitative aptitude. The technical section plays a major role in selection, so regular practice of MCQs is very important for success.

Electrical Engineering MCQs generally cover topics such as electrical circuits, network theory, electromagnetic fields, machines, power systems, control systems, measurements, and electrical instrumentation. Candidates are expected to have a strong understanding of both theoretical concepts and practical applications.

Practicing SSC JE EE MCQs helps candidates improve speed and accuracy in solving numerical and concept-based problems. Since the exam is time-bound, efficient problem-solving is necessary to complete the paper within the given duration. Continuous practice also helps in identifying important and frequently asked topics.

Apart from technical subjects, the exam also includes general awareness, reasoning, and quantitative aptitude. General awareness covers current affairs, Indian history, geography, polity, and basic science. Reasoning questions test logical thinking and analytical ability, while quantitative aptitude includes topics like percentage, ratio, time and work, and data interpretation.

To prepare effectively for SSC JE Electrical Engineering MCQs, candidates should follow a structured study plan. This includes daily MCQ practice, revision of formulas and concepts, and regular mock tests. Understanding basic electrical principles is very important before attempting advanced-level questions.

Previous year question papers are highly useful for understanding exam trends and difficulty levels. They help candidates focus on important topics and improve their preparation strategy accordingly.

Mock tests play a crucial role in preparation as they simulate real exam conditions and improve time management skills. After each test, analyzing mistakes is essential for continuous improvement and better performance in the final exam.

Consistency is the key to success in SSC JE EE exams. Candidates should dedicate fixed study hours daily for both technical and non-technical subjects. Breaking the syllabus into smaller sections makes preparation more manageable and effective.

Understanding the syllabus is the first step in preparation. It allows candidates to prioritize important topics such as circuit theory, machines, and power systems while maintaining balance with other sections.

In conclusion, SSC JE Electrical Engineering MCQs are a powerful tool for exam preparation. With regular practice, strong conceptual clarity, and proper planning, candidates can significantly improve their performance. A disciplined approach that includes mock tests, revision, and topic-wise study increases the chances of success in SSC JE EE recruitment exams. Staying consistent and focused is essential for achieving a successful engineering career in the government sector.

Q1. Ohm law relates which electrical quantities?

Correct Answer: A

Ohm law states that current flowing through a conductor is directly proportional to the voltage across it, provided temperature and physical conditions remain constant. It is expressed as V equals IR.

Q2. The SI unit of electrical resistance is?

Correct Answer: C

The SI unit of electrical resistance is ohm. Resistance opposes the flow of electric current in a circuit and is represented by the symbol R.

Q3. Kirchhoff current law is based on conservation of?

Correct Answer: B

Kirchhoff current law is based on conservation of charge. It states that the algebraic sum of currents entering and leaving a junction in an electrical network is zero.

Q4. Kirchhoff voltage law is based on conservation of?

Correct Answer: A

Kirchhoff voltage law is based on conservation of energy. It states that the algebraic sum of all voltages around any closed loop in a circuit is zero.

Q5. The reciprocal of resistance is called?

Correct Answer: B

Conductance is the reciprocal of resistance. It represents the ability of a material or circuit to allow electric current to pass through it. Its unit is siemens.

Q6. The SI unit of capacitance is?

Correct Answer: B

The SI unit of capacitance is farad. A capacitor stores electrical energy in an electric field and its capacitance depends on plate area, distance, and dielectric material.

Q7. The SI unit of inductance is?

Correct Answer: B

The SI unit of inductance is henry. Inductance is the property of a coil or circuit by which it opposes change in current through induced emf.

Q8. In a purely inductive AC circuit, current lags voltage by?

Correct Answer: C

In a purely inductive AC circuit, current lags the voltage by 90 degrees. This happens because the inductor opposes changes in current due to self induction.

Q9. In a purely capacitive AC circuit, current leads voltage by?

Correct Answer: C

In a purely capacitive AC circuit, current leads the voltage by 90 degrees. The capacitor charges and discharges with alternating voltage, causing current to lead voltage.

Q10. Power factor of a pure resistive circuit is?

Correct Answer: B

In a pure resistive circuit, voltage and current are in phase. Therefore, the phase angle is zero and power factor is cos zero, which is equal to unity.

Q11. The unit of electrical energy commonly used in electricity bills is?

Correct Answer: B

Electrical energy in electricity bills is commonly measured in kilowatt hour. One kilowatt hour means one kilowatt of power consumed for one hour.

Q12. One kilowatt hour is equal to?

Correct Answer: C

One kilowatt hour equals 1000 watts used for 3600 seconds. Therefore, it equals 3.6 million joules or 3.6 megajoules of energy.

Q13. Which theorem is used to replace a complex network by a single voltage source and series resistance?

Correct Answer: B

Thevenin theorem replaces a linear active network by an equivalent voltage source in series with an equivalent resistance. It simplifies circuit analysis across a load.

Q14. Which theorem is used to replace a complex network by a current source and parallel resistance?

Correct Answer: B

Norton theorem replaces a linear active network by an equivalent current source in parallel with an equivalent resistance. It is useful for simplifying load current calculations.

Q15. Maximum power transfer occurs when load resistance is equal to?

Correct Answer: B

Maximum power transfer in a DC circuit occurs when load resistance is equal to the internal or Thevenin resistance of the source network.

Q16. Transformer works on the principle of?

Correct Answer: B

A transformer works on the principle of mutual induction. Alternating current in the primary winding produces changing magnetic flux, which induces emf in the secondary winding.

Q17. A transformer is used to change?

Correct Answer: B

A transformer changes the voltage level of alternating current. It can step up or step down voltage but does not work directly on steady DC supply.

Q18. The core of a transformer is laminated to reduce?

Correct Answer: B

Transformer cores are laminated to reduce eddy current loss. Laminations increase resistance to circulating currents in the core and improve transformer efficiency.

Q19. The main function of transformer oil is?

Correct Answer: B

Transformer oil provides cooling and electrical insulation. It removes heat from windings and core while also preventing electrical breakdown inside the transformer.

Q20. Which loss in a transformer is also called iron loss?

Correct Answer: B

Iron loss or core loss occurs in the transformer core. It includes hysteresis loss and eddy current loss and is almost constant at normal voltage and frequency.

Q21. The speed of a DC motor is mainly controlled by varying?

Correct Answer: A

Speed of a DC motor can be controlled by varying armature voltage or field flux. These methods are commonly used in industrial DC motor drives.

Q22. The function of commutator in a DC machine is to?

Correct Answer: B

The commutator in a DC machine acts as a mechanical rectifier. It converts alternating emf induced in the armature conductors into unidirectional voltage at the terminals.

Q23. Which DC motor is preferred for electric traction?

Correct Answer: B

DC series motor is preferred for electric traction because it provides very high starting torque. This makes it suitable for trains, cranes, and heavy starting applications.

Q24. The speed of a synchronous motor is given by?

Correct Answer: A

Synchronous speed is given by Ns equals 120f by P, where f is supply frequency and P is the number of poles. The motor runs at this constant speed.

Q25. Slip in an induction motor is zero at?

Correct Answer: B

Slip is the difference between synchronous speed and rotor speed expressed as a fraction of synchronous speed. At synchronous speed, this difference becomes zero.

Q26. At starting, slip of a three phase induction motor is?

Correct Answer: B

At starting, the rotor is stationary, so rotor speed is zero. Therefore, slip equals one or 100 percent at the instant of starting.

Q27. Which starter is commonly used for small induction motors?

Correct Answer: A

Direct online starter is commonly used for small induction motors. It connects the motor directly to the supply and is simple, economical, and easy to maintain.

Q28. Star delta starter is used to reduce?

Correct Answer: B

A star delta starter reduces starting current of a three phase induction motor. The motor starts in star connection and later runs in delta connection.

Q29. Which device protects an electrical circuit from overcurrent?

Correct Answer: A

A fuse protects an electrical circuit from overcurrent. When current exceeds the rated value, the fuse element melts and disconnects the circuit.

Q30. MCB stands for?

Correct Answer: B

MCB stands for Miniature Circuit Breaker. It automatically switches off the circuit during overload or short circuit conditions and can be reset after fault clearance.

Q31. The main function of a circuit breaker is to?

Correct Answer: B

A circuit breaker interrupts current during fault conditions such as short circuit or overload. It protects equipment, cables, and power systems from damage.

Q32. Which relay is commonly used for protection against excessive current?

Correct Answer: A

An overcurrent relay operates when current exceeds a preset value. It is commonly used in feeders, motors, transformers, and distribution protection schemes.

Q33. Buchholz relay is used for protection of?

Correct Answer: B

Buchholz relay is used in oil immersed transformers. It detects internal faults by sensing gas accumulation or sudden oil movement between the main tank and conservator.

Q34. The power factor can be improved by using?

Correct Answer: A

Power factor is commonly improved by using capacitor banks. Capacitors supply leading reactive power and reduce the lagging reactive power demand of inductive loads.

Q35. Which instrument is used to measure electrical power?

Correct Answer: C

A wattmeter is used to measure electrical power. It has current and voltage coils and can measure power in DC and AC circuits.

Q36. Which instrument is used to measure insulation resistance?

Correct Answer: A

A megger is used to measure insulation resistance of cables, motors, transformers, and electrical installations. It applies high DC voltage for testing insulation condition.

Q37. Moving iron instruments can be used for?

Correct Answer: C

Moving iron instruments can be used for both AC and DC measurements. They work on magnetic attraction or repulsion and are commonly used as ammeters and voltmeters.

Q38. PMMC instrument is suitable for measuring?

Correct Answer: A

PMMC instruments are suitable for DC measurements only. In AC, the average torque becomes zero unless a rectifier is used with the instrument.

Q39. The SI unit of magnetic flux is?

Correct Answer: B

The SI unit of magnetic flux is weber. Magnetic flux represents the total magnetic field passing through a given area.

Q40. The SI unit of magnetic flux density is?

Correct Answer: B

Magnetic flux density is measured in tesla. It represents magnetic flux per unit area and is an important quantity in magnetic circuits and machines.

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