MES Departmental • 2025 • Paper-I
The product of voltage and alternating current measured in unit of volt-amperes is called-
A)
Apparent Power
B)
Real Power
C)
Active Power
D)
Reactive Power
Option A is correct: Apparent Power.
MES Departmental • 2025 • Paper-I
Which one of the following work is not included in annual operation and maintenance of Deposited Works as per General condition for execution and maintenance of Deposit works.
A)
Annual painting
B)
Replacement of GOAB Switch
C)
Jungle cutting
D)
Topping up of Transformer oil.
Option A is correct: Annual painting.
MES Departmental • 2025 • Paper-I
Who is responsible for Right of Way issue in any type of electrical works executed under Deposit-III?
A)
The estimate approving authority
B)
The authority who procured materials
C)
Paying authority
D)
Interested party. The person who deposited the Deposit-III
Option D is correct: Interested party. The person who deposited the Deposit-III.
MES Departmental • 2025 • Paper-I
In a Guranteed Standard, Power Restore time in the case of normal fuse-off calls, fuses at the distribution transformer or at the consumer premises from receiving the complaint in Class-I Cities is-
A)
One day
B)
6 Hours
C)
4 Hours
D)
10 hours
Option C is correct: 4 Hours.
MES Departmental • 2025 • Paper-I
In an Overall Standard of performance, the percentage Licensee shall achieve the standards of performance in release of new connection is-
A)
93%
B)
99%
C)
95%
D)
90%
Option C is correct: 95%.
MES Departmental • 2025 • Paper-I
The higher contracted load permissible as per JERC Supply code for Single Phase LT Domestic Consumer is-
A)
5 kW
B)
6 kW
C)
10 kW
D)
8 kW
According to the Joint Electricity Regulatory Commission (JERC) Supply Code applicable to the North Eastern states (including Mizoram), there are specific limits for the contracted load based on the phase of the connection to ensure grid stability and prevent overloading of single-phase transformers. For a Single Phase Low Tension (LT) Domestic connection, the maximum permissible contracted load is generally capped at 5 kW. If a consumer's load requirement exceeds 5 kW, the Supply Code mandates that the consumer must apply for a Three Phase connection to balance the load across the phases of the distribution system. Therefore, 5 kW is the upper limit for single-phase domestic consumers.
MES Departmental • 2025 • Paper-I
What is the interval of periodical inspection and testing to be carried out by the electrical Inspectorate or by the Department if the party/consumer carry out annual Operation and maintenance by himself.
A)
Annually
B)
Two years
C)
Five years
D)
10 years
Option A is correct: Annually.
MES Departmental • 2025 • Paper-I
Calculate the Load security to be deposited by the consumer with the help of parameter given below: (a) Applicable Tariff: Monthly fixed charge : Rs 90/contracted load, Monthly energy charge : Rs 11.1 for all Unit; (b) Load factor : 30%; (c) Contracted load of consumer : 5kW; (d) Contracted load is same as Connected load
MES Departmental • 2025 • Paper-I
What are the safety equipment and tools to be used for the lineman? Write down the importance of those equipment to protect the lineman.
MES Departmental • 2025 • Paper-I
The load in kW (kilo Watt) or kVA (kilo Volt Ampere), agreed to be supplied by the licensee and indicated in the agreement executed between the licensee and the consumer is known as-
A)
Contracted load
B)
Demand Load
C)
Connected load
D)
Peak load
Option A is correct: Contracted load.
MES Departmental • 2025 • Paper-I
The Name of the instrument used for measuring insulation resistance of power distribution line is-
A)
Meggar
B)
Multi meter
C)
Earth Tester
D)
Synchronoscope
Option A is correct: Meggar.
MES Departmental • 2025 • Paper-I
The Generating Station having Black Start capability is called-
A)
Starter
B)
Black Starter
C)
Self Sufficient station
D)
Black Start Station
Option D is correct: Black Start Station.
MES Departmental • 2025 • Paper-I
The minimum required breakdown voltage value for Transformer Oil at 2.5mm gap for 132kV Voltage level as per Operation and maintenance guidelines for lines & Sub-Station is-
A)
40 kV
B)
60 kV
C)
30 kV
D)
50 kV
Option A is correct: 40 kV.
MES Departmental • 2025 • Paper-I
That period in a day when the electrical power demand is lowest as described by JERC Grid Code is-
A)
Scheduled Period
B)
Isolation period
C)
Lean Period
D)
Off Peak period
According to the JERC (Joint Electricity Regulatory Commission) Grid Code and general power system terminology, the daily load curve is divided into different periods based on demand.
1. **Off Peak Period**: This is the specific time interval during a 24-hour cycle when the electrical power demand is at its lowest (typically during late night or early morning hours).
2. **Peak Period**: The time when demand is at its highest (usually evening hours).
3. **Lean Period**: While 'lean' refers to low demand, in the context of Grid Codes and power tariffs, 'Lean Period' usually refers to a seasonal low (e.g., non-summer months) rather than a daily time period.
4. **Scheduled Period**: This refers to a time slot allocated for a specific activity (like maintenance or power transfer) and does not describe demand levels.
5. **Isolation Period**: This is a technical term referring to the time a piece of equipment is disconnected from the power source for safety/maintenance.
MES Departmental • 2025 • Paper-I
What is the latest name of Electricity Regulatory commission for the State of Mizoram?
A)
Mizoram State Electricity Regulatory Commission
B)
Mizoram Electricity Regulatory Commission
C)
Joint Electricity Regulatory Commission
D)
Electricity Regulatory Commission for Mizoram
Under the Electricity Act, 2003, state governments are required to establish a State Electricity Regulatory Commission (SERC) to regulate the electricity sector. For the state of Mizoram, the statutory body established to perform these functions is the 'Mizoram Electricity Regulatory Commission' (MERC). While it is a 'State' commission by nature, the official nomenclature used in government notifications and official documentation is the Mizoram Electricity Regulatory Commission. Option (a) adds an unnecessary word 'State', and options (c) and (d) are incorrect as Mizoram does not operate under a Joint Commission (which is a shared body between multiple states) nor is the phrasing in (d) the official title.
MES Departmental • 2025 • Paper-I
The condition of a generating station which is loaded but is not running at its declared availability is called as-
A)
Off Peak load
B)
Part Load
C)
Partial load
D)
Plant load
Option B is correct: Part Load.
MES Departmental • 2025 • Paper-I
In a Guaranteed Standard, the Licensee shall restore supply in the case of distribution transformer failures by replacement of transformer in Class-I Cities & Urban Areas
A)
Within One day
B)
Within 48 Hours
C)
Within 12 Hours
D)
Within 3 days
Option B is correct: Within 48 Hours.
MES Departmental • 2025 • Paper-I
Define what is ‘Renewable Rich State’ as describe in CEA (Deviation Settlement Mechanism and Related Matters) Regulations, 2014.
MES Departmental • 2025 • Paper-I
In an Overall Standard of performance, the percentage of distribution transformers replaced within the time limits should be-
A)
90%
B)
95%
C)
85%
D)
70%
Option B is correct: 95%.
MES Departmental • 2025 • Paper-I
The minimum operating safety distance for live line upto 33kV as per safety manual issued by P&E Department is-
A)
Two feet
B)
Five feet
C)
Three Feet
D)
Four Feet
According to the safety guidelines and manuals issued by the Power & Electricity (P&E) Department of Mizoram for electrical safety, specific minimum approach distances (MAD) are mandated to prevent accidental flashovers or electric shocks. For live lines with a voltage rating up to 33kV, the minimum operating safety distance is established as three feet. This distance acts as a safety buffer to ensure that personnel working in the vicinity of energized conductors are protected from electrical arcs. Distances shorter than three feet (such as two feet) are considered unsafe for this voltage level, while distances like four or five feet, though safer, are not the 'minimum' required standard specified in the departmental safety manual for this specific voltage bracket.
MES Departmental • 2025 • Paper-I
Write notes on procedure for temporary supply as per JERC Supply Code regulation.
MES Departmental • 2025 • Paper-I
The name of the seller those generating station based on other than wind or solar or hybrid of wind-solar resources as described in CEA (Deviation Settlement Mechanism and Related Matters) Regulations, 2014 is known as-
A)
General Seller
B)
Hydro Electric Seller
C)
Conventional Seller
D)
Ancillary Seller
Option C is correct: Conventional Seller.
MES Departmental • 2025 • Paper-I
The permissible limit of voltage in High Tension as per JERC Supply Code is-
A)
Plus or minus 6%
B)
Plus or minus 9%
C)
Plus or minus 10%
D)
Plus or minus 5%
According to the Joint Electricity Regulatory Commission (JERC) Supply Code (which governs electricity supply in the North Eastern states including Mizoram), the standards for voltage variation are strictly defined to ensure equipment safety and grid stability. For High Tension (HT) consumers, the permissible limit of voltage variation is typically maintained at ±9% of the nominal voltage. In contrast, Low Tension (LT) supply usually has a tighter or different tolerance (often ±6%) depending on the specific section of the code. Therefore, for HT supply, the correct permissible limit is ±9%.
MES Departmental • 2025 • Paper-I
Write short notes on maintenance schedule to be followed in maintenance of 33kV and 11kV line. What are the major components to be checked for preventive maintenance of lines before monsoon season.
MES Departmental • 2025 • Paper-I
In a Guaranteed Standard, the Licensee shall inspect and check the correctness of the meter in Rural Areas
A)
Within One week
B)
Within 4 Days
C)
Within 10 Day
D)
Within 15 days
Option A is correct: Within One week.
