NEA Electrical Level 3/4/5 – Set 2
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NEA Electrical Level 3/4/5 – Set 2 - sample questions with answers
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1. Which material is commonly used in electrical heating devices?
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Answer: Nichrome
Nichrome is used in heating elements due to its high electrical resistance and high melting point.
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2. What type of energy does an alternator convert into electrical energy?
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Answer: Mechanical energy
An alternator converts mechanical energy into AC electrical energy.
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3. For which of the following tasks can solar energy be used?
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Answer: Battery charging, water pumping, and lighting
Solar energy can be effectively used for battery charging, water pumping, and lighting.
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4. How are interpole windings connected in DC machines?
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Answer: In series with the armature
In DC machines, interpole windings are connected in series with the armature.
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5. Which type of motor is suitable for applications requiring frequent starting and stopping?
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Answer: Capacitor start motor
Capacitor start motors provide high starting torque, making them suitable for applications requiring frequent starting and stopping.
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6. Which test is performed to determine the core losses of a transformer?
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Answer: Open circuit test
The open circuit test of a transformer is used to measure the core losses (hysteresis and eddy current losses).
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7. Which method is adopted to measure copper losses in a transformer?
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Answer: Short circuit test
Copper losses (I²R losses) of a transformer are determined using the short circuit test.
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8. Which device is commonly known as an alternator?
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Answer: Synchronous generator
A synchronous generator is also known as an alternator as it produces AC electricity.
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9. Which device is used to interrupt or break the electrical current?
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Answer: Circuit breaker
A circuit breaker is a device that interrupts the electrical current during a fault or as required.
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10. What determines the boundary of the protective zone in a power system?
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Answer: Location of Current Transformer (CT)
The location of the current transformer (CT) determines the boundary of the protective zone.
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11. What is used in power line carrier communication to minimize the effect of high frequencies?
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Answer: Wave traps
Wave traps are used in power line carrier communication to filter out and minimize high-frequency effects.
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12. Which type of substation is most suitable for locations where space is limited?
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Answer: Gas insulated substation
Gas insulated substations (GIS) are used in space-constrained locations because they require significantly less area.
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13. For what primary purpose is transmission line transposition performed?
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Answer: To balance the line voltage drop
Transmission line transposition is performed to balance the line voltage drop by equalizing the impedance of the phases.
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14. Which insulator is preferred for dead end or sharp bend applications?
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Answer: Strain insulator
Strain type insulators are preferred for dead end or sharp bend applications to withstand the mechanical tension of the conductor.
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15. Which cable is used to connect the distributor to the consumer terminals?
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Answer: Service mains cable
Service mains cables connect the distributor to the consumer terminals.
This chapter has 77 questions. Practise them all with timing, answers and explanations.