MCQ questions with answers for JE Electrical JKSSB | PART 1

Here are MCQ questions with answers for JE Electrical JKSSB exam preparation, covering core electrical engineering topics:

### **Basic Electrical Engineering**
1. **Q:** The SI unit of electric current is:
**A)** Volt
**B)** Ampere
**C)** Ohm
**D)** Watt
**Ans: B**

2. **Q:** Ohm’s Law states that:
**A)** \( V = I/R \)
**B)** \( I = VR \)
**C)** \( V = IR \)
**D)** \( R = VI \)
**Ans: C**

3. **Q:** The resistance of a conductor increases with:
**A)** Increase in cross-sectional area
**B)** Decrease in length
**C)** Increase in temperature
**D)** Decrease in temperature
**Ans: C**

4. **Q:** Kirchhoff’s Voltage Law (KVL) states that:
**A)** The sum of currents at a junction is zero
**B)** The sum of voltages in a closed loop is zero
**C)** The power dissipated equals power supplied
**D)** Voltage is proportional to current
**Ans: B**

5. **Q:** The power factor of a purely resistive circuit is:
**A)** 0
**B)** 0.5
**C)** 1
**D)** Infinite
**Ans: C**

—

### **Electrical Machines**
6. **Q:** In a transformer, the primary and secondary windings are:
**A)** Electrically linked but magnetically isolated
**B)** Magnetically linked but electrically isolated
**C)** Both electrically and magnetically linked
**D)** Neither electrically nor magnetically linked
**Ans: B**

7. **Q:** The slip of an induction motor at standstill is:
**A)** 0
**B)** 0.5
**C)** 1
**D)** Infinite
**Ans: C**

8. **Q:** The starting torque of a squirrel-cage induction motor is:
**A)** Very high
**B)** Very low
**C)** Moderate
**D)** Zero
**Ans: B**

9. **Q:** DC generators work on the principle of:
**A)** Electromagnetic induction
**B)** Faraday’s law
**C)** Fleming’s left-hand rule
**D)** Fleming’s right-hand rule
**Ans: D**

10. **Q:** The speed of a DC motor is inversely proportional to:
**A)** Armature current
**B)** Field flux
**C)** Applied voltage
**D)** Armature resistance
**Ans: B**

—

### **Power Systems**
11. **Q:** The standard transmission voltage in India for long distances is:
**A)** 11 kV
**B)** 33 kV
**C)** 132 kV
**D)** 400 kV
**Ans: D**

12. **Q:** The primary function of a relay in a power system is:
**A)** Voltage regulation
**B)** Fault detection and isolation
**C)** Power factor correction
**D)** Load balancing
**Ans: B**

13. **Q:** The main advantage of bundled conductors in transmission lines is:
**A)** Reduced mechanical stress
**B)** Reduced corona loss
**C)** Increased current capacity
**D)** Lower cost
**Ans: B**

14. **Q:** The frequency of AC power supply in India is:
**A)** 50 Hz
**B)** 60 Hz
**C)** 100 Hz
**D)** 120 Hz
**Ans: A**

15. **Q:** Skin effect occurs in:
**A)** DC transmission
**B)** AC transmission
**C)** Both AC and DC
**D)** Underground cables only
**Ans: B**

—

### **Control Systems**
16. **Q:** The transfer function of a system is defined for:
**A)** Non-linear systems
**B)** Time-invariant systems
**C)** Linear time-invariant systems
**D)** Unstable systems
**Ans: C**

17. **Q:** A PID controller improves system response by:
**A)** Reducing damping
**B)** Increasing steady-state error
**C)** Providing proportional, integral, and derivative action
**D)** Decreasing stability
**Ans: C**

18. **Q:** The gain margin of a system is the factor by which gain can be increased to make it:
**A)** Oscillatory
**B)** Stable
**C)** Marginally stable
**D)** Unstable
**Ans: C**

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### **Power Electronics**
19. **Q:** A thyristor can be turned OFF by:
**A)** Applying gate pulse
**B)** Forward voltage
**C)** Reverse voltage
**D)** Increasing temperature
**Ans: C**

20. **Q:** In a half-wave rectifier, the output frequency is:
**A)** Same as input
**B)** Twice the input
**C)** Half the input
**D)** Zero
**Ans: A**

21. **Q:** The primary function of a snubber circuit is to:
**A)** Limit \( \frac{di}{dt} \)
**B)** Limit \( \frac{dv}{dt} \)
**C)** Reduce switching losses
**D)** Increase efficiency
**Ans: B**

—

### **Measurements & Instrumentation**
22. **Q:** The instrument used to measure insulation resistance is:
**A)** Multimeter
**B)** Wattmeter
**C)** Megger
**D)** Oscilloscope
**Ans: C**

23. **Q:** A moving-coil instrument measures:
**A)** AC only
**B)** DC only
**C)** Both AC and DC
**D)** None
**Ans: B**

24. **Q:** The error caused by the insertion of an ammeter in a circuit is:
**A)** Loading error
**B)** Hysteresis error
**C)** Parallax error
**D)** Instrument error
**Ans: A**

—

### **Network Theory**
25. **Q:** The time constant of an RC circuit is:
**A)** \( RC \)
**B)** \( 1/RC \)
**C)** \( R/C \)
**D)** \( C/R \)
**Ans: A**

26. **Q:** Norton’s equivalent circuit consists of:
**A)** Voltage source and series resistance
**B)** Voltage source and parallel resistance
**C)** Current source and parallel resistance
**D)** Current source and series resistance
**Ans: C**

—

### **Digital Electronics**
27. **Q:** The binary equivalent of decimal 13 is:
**A)** 1101
**B)** 1110
**C)** 1011
**D)** 1001
**Ans: A**

28. **Q:** A flip-flop is a:
**A)** Combinational circuit
**B)** Sequential circuit
**C)** Analog circuit
**D)** Power circuit
**Ans: B**

—

### **Microprocessors**
29. **Q:** The 8085 microprocessor has a ___ bit data bus.
**A)** 8
**B)** 16
**C)** 32
**D)** 64
**Ans: A**

30. **Q:** The stack pointer in 8085 is a:
**A)** 8-bit register
**B)** 16-bit register
**C)** 32-bit register
**D)** 64-bit register
**Ans: B**

—

### **Utilization of Electrical Energy**
31. **Q:** The most efficient lighting source is:
**A)** Incandescent lamp
**B)** Fluorescent lamp
**C)** LED
**D)** Halogen lamp
**Ans: C**

32. **Q:** Electric traction systems in India use:
**A)** 1.5 kV DC
**B)** 25 kV AC
**C)** 50 kV AC
**D)** 230 V AC
**Ans: B**

—

### **Safety & Protection**
33. **Q:** The minimum earth resistance for domestic wiring should be:
**A)** 0.1 Ω
**B)** 1 Ω
**C)** 5 Ω
**D)** 10 Ω
**Ans: C**

34. **Q)** A fuse protects against:
**A)** Overvoltage
**B)** Overcurrent
**C)** Short circuit
**D)** Both B and C
**Ans: D**

—

### **Advanced Topics**
35. **Q:** The unit of magnetic flux density is:
**A)** Weber
**B)** Tesla
**C)** Henry
**D)** Gauss
**Ans: B**

36. **Q:** Hysteresis loss in a transformer core depends on:
**A)** Frequency and volume
**B)** Flux density and frequency
**C)** Voltage and current
**D)** Temperature and resistance
**Ans: B**

—

**[Download Full PDF](https://example.com/je-electrical-mcqs)** (Link for complete 100 questions with detailed solutions)

**Key Areas Covered:**
– Transformers, DC/AC Motors, Generators
– Transmission Lines, Switchgear, Protection
– OP-Amps, Feedback Systems
– Diodes, Thyristors, Inverters
– Bridges, Transducers, Measurement Errors
– Theorems (Thevenin, Norton), Resonance
– Logic Gates, Counters, Registers
– 8085 Architecture, Addressing Modes
– Illumination, Heating, Traction
– Earthing, Circuit Breakers, Safety Codes

**Preparation Tips:**
1. **Revise Core Concepts:** Focus on Ohm’s Law, Kirchhoff’s Laws, machine principles.
2. **Practice Diagrams:** Draw equivalent circuits of transformers/motors.
3. **Solve Numericals:** Emphasize transmission line losses, efficiency calculations.
4. **Memorize Standards:** Indian Electricity Rules, IS/IEC codes.
5. **Mock Tests:** Time-bound practice to improve speed.

*For JKSSB-specific syllabus weightage, refer to the official notification.*