Additional Assistant Engineer (Electrical) – Verified PYQ Authority Guide
Additional Assistant Engineer (Electrical) is an exam authority hub based on SRO’s verified mapped PYQs. It helps students see the papers/years and technical areas represented in the current corpus and move directly into solved exam questions. Every factual learning cue below is drawn from the existing verified, published and approved English PYQ corpus or from its Knowledge Graph relationships; the hub does not invent unsupported technical claims.
PYQ evidence snapshot
200 verified PYQs are currently mapped to this Exam hub. The represented years include 2026. Exam coverage currently includes Additional Assistant Engineer (Electrical). Subject context includes Electrical Engineering, General Awareness, English Language, Gujarati Language. These values come from live mappings and can expand automatically when new verified PYQs are added.
Most useful verified PYQs to solve first
Start with the actual questions rather than memorising a generic note. The links below are ranked from the mapped corpus using repeat history and editorial quality, while the complete explanation stays on the individual question page.
- The transformation ratio of an isolation transformer is usually:
Additional Assistant Engineer (Electrical) · 2026 · Unity Transformation Ratio
A — 1 : 1. A usual isolation transformer has equal primary and secondary turns so that it transfers approximately the same AC voltage… - Which of the following systems is not a part of single phase energy meter?
Additional Assistant Engineer (Electrical) · 2026 · Operating Systems of Energy Meter
C — Damping System. In the conventional single-phase induction energy meter, the four named systems are driving, moving, braking and registering. A separate damping… - For a power inverter circuit that demands fast switching and high efficiency, which MOSFET type would be most effective?
Additional Assistant Engineer (Electrical) · 2026 · N-Channel Enhancement MOSFET
D — N-channel enhancement-mode MOSFET. Among the listed device types, it combines normally-off gate control with the low conduction resistance commonly sought in efficient… - A balanced delta-connected load of (4+j3) Ω per phase is connected to a balanced three-phase 440V supply. The phase current is 10A. Find the total active power.
Additional Assistant Engineer (Electrical) · 2026 · Three-Phase Active Power
A is the intended option if the stated phase current of 10 A and the 440 V line voltage are used: P = √3… - Which of the following statements is not true about a vertical amplifier?
Additional Assistant Engineer (Electrical) · 2026 · Gain and Sensitivity
D — “Sensitivity is inversely proportional to the gain” is the incorrect statement under the question’s deflection-per-volt definition of sensitivity. Increasing vertical gain increases… - Voltage magnification factor of a series resonance circuit is:
Additional Assistant Engineer (Electrical) · 2026 · Voltage Magnification / Q-Factor
B — Q = ωL/R, with ω evaluated at resonance (ω = ω₀). The quality factor equals the voltage across either reactive component divided… - Which type of wire is typically used to connect a ceiling fan to the power supply in residential buildings?
Additional Assistant Engineer (Electrical) · 2026 · Ceiling Fan Wiring
A — Flexible copper wire. An appropriately rated, insulated flexible copper conductor is the suitable choice among the given options for the fan’s final… - To prevent an alternator from operating in motor mode due to prime mover failure, a/an __________ relay is used.
Additional Assistant Engineer (Electrical) · 2026 · Reverse Power Relay
A — Reverse Power relay. It detects active power flowing from the energized system into the alternator when the prime mover can no longer…
Formula & key-relationship bank from verified solutions
Ideal transformer: V₂/V₁ = N₂/N₁. For equal turns, N₂ = N₁ and V₂/V₁ = 1.T_d ∝ VIcosφ; T_b ∝ n. At steady speed, n ∝ P and accumulated revolutions ∝ ∫P dt = energy.P_cond ≈ I_D,rms² × R_DS(on), using the MOSFET current RMS over the full switching period. Gate-drive power ≈ Q_g × V_drive × f_s.Δ: V_ph = V_L; I_L = √3I_ph; cosφ = R/|Z|; P = 3V_phI_phcosφ = √3V_LI_Lcosφ. Given-current route: 10.56 kW. Voltage–impedance route: 92.928 kW.y = kA_vV_in; S = y/V_in = kA_v; vertical scale in V/div = 1/S when S is in div/V.ω₀ = 1/√(LC); f₀ = 1/(2π√(LC)); Q = V_L/V = V_C/V = ω₀L/R = 1/(ω₀CR).
Use these as revision triggers and open the linked PYQ before applying a formula numerically; variable definitions and assumptions belong to the exact solved question.
Core ideas repeatedly reinforced by the solved corpus
- A — 1 : 1. A usual isolation transformer has equal primary and secondary turns so that it transfers approximately the same AC voltage while providing galvanic separation between the circuits.
- C — Damping System. In the conventional single-phase induction energy meter, the four named systems are driving, moving, braking and registering. A separate damping system is not included in this classification.
- D — N-channel enhancement-mode MOSFET. Among the listed device types, it combines normally-off gate control with the low conduction resistance commonly sought in efficient power switching.
- A is the intended option if the stated phase current of 10 A and the 440 V line voltage are used: P = √3 × 440 × 17.32 × 0.8 ≈ 10.56 kW. However, the supplied voltage, impedance…
- D — “Sensitivity is inversely proportional to the gain” is the incorrect statement under the question’s deflection-per-volt definition of sensitivity. Increasing vertical gain increases screen deflection for the same input voltage.
Exam tips already validated in SRO solutions
- Select 1:1 when “usual isolation transformer” is asked. Separately check for electrically separate windings when galvanic isolation is the issue.
- Disc speed indicates the rate of energy use (power); the accumulated revolution count indicates energy.
- Use the gate voltage at which the datasheet specifies R_DS(on). Threshold voltage indicates the onset of small channel current, not full enhancement.
- Before calculating three-phase power, label every voltage and current as line or phase and check V_ph = I_ph|Z|.
- The question asks which statement is NOT true. Select the false statement, not one of the three correct properties.
Common mistakes to avoid
- Do not assume that equal voltages mean the circuits are electrically connected, or that every transformer providing isolation must have a 1:1 ratio.
- Do not equate energy with power or assume that braking means the disc must stop while the load is consuming power.
- Do not assume zero switching loss or use the gate-threshold voltage as the required full-load drive voltage.
- Do not hide the inconsistent data by using |Z| only to find power factor. A correct-looking option does not make conflicting input values consistent.
- Do not confuse increased sensitivity with an increased numerical V/div setting. They move in opposite directions.
Topic and concept coverage
Mapped topic labels include Current Affairs / GK, Grammar & Vocabulary, Arithmetic / Mensuration, Analogy / Series / Relations, Transmission Lines, 8051 Microcontroller, Circuit Breakers. The concept trail includes General Studies, English Language Skills, Gujarati Language Skills, Quantitative Reasoning, Analytical Reasoning, Arc Voltage, Arc Voltage-Current Phase Relation, Armature Resistance and Inductance. Use these labels as a revision map: move from the broad area to the narrow concept, solve a verified PYQ, inspect the detailed reasoning, and then attempt another question from the same cluster.
Knowledge Graph navigation
Continue with Gujarat Panchayat Service Selection Board (GPSSB), CBRT Examination, Electrical Engineering, General Studies, Facts & Policies, Current Affairs / GK, General Awareness, General Awareness. These are canonical SRO entity links based on the Knowledge Graph and shared question mappings, not keyword-stuffed tag pages.
How to revise this authority page efficiently
- Solve before reading: answer a mapped PYQ first.
- Read the exact explanation: verify the correct principle, formula, distractor logic and common mistake on that question page.
- Move one level in the graph: use the closest concept/sub-topic/topic link rather than opening unrelated content.
- Reattempt: solve another verified PYQ from this hub and check whether the same error repeats.
Quality scope: this page is automatically maintained from SRO’s verified mapped corpus. It enriches one canonical authority URL instead of generating multiple near-duplicate pages for keyword variants. Manual authority articles are never overwritten by the automated engine.