Fundamentals of ElectricityAircraft & Engines — DGCA CPL practice questions
Question 1 of 6
A voltmeter and an ammeter are connected, respectively:
All 6 questions — Fundamentals of Electricity
Aircraft & Engines · DGCA CPL. The correct option is marked on each.
Q1. A voltmeter and an ammeter are connected, respectively:
- A.Both in series
- B.Both in parallel
- C.Voltmeter in parallel, ammeter in series✓
- D.Voltmeter in series, ammeter in parallel
Why: Voltage is measured across a component (parallel); current must flow through the meter (series).
Q2. Ohm's law states:
- A.V = I × R✓
- B.V = I / R
- C.V = R / I
- D.V = I² × R
Why: Voltage = Current × Resistance; and electrical power P = V × I watts.
Q3. A trip-free circuit breaker:
- A.Cannot be reset
- B.Cannot be held closed against a fault current✓
- C.Trips only on the ground
- D.Replaces the battery
Why: Even if held in, a trip-free CB will open under fault current — it cannot be forced to feed a short.
Q4. Once fully charged, a capacitor in a DC circuit:
- A.Passes DC freely
- B.Blocks the flow of DC✓
- C.Becomes a resistor
- D.Reverses the current
Why: A capacitor stores charge, appears to pass AC, but blocks steady DC once charged.
Q5. A lead-acid battery is fully charged when its electrolyte's specific gravity is about:
- A.1.00
- B.1.15
- C.1.30✓
- D.1.60
Why: SG ≈ 1.30 indicates full charge; capacity is rated in ampere-hours and at least 80% charge is required before flight.
Q6. Nickel-cadmium batteries are more susceptible than lead-acid to:
- A.Freezing
- B.Thermal runaway during charging✓
- C.Low voltage output
- D.Sulphation
Why: NiCd batteries are lighter and better in cold, but can overheat uncontrollably (thermal runaway) while charging.