DGCA Module 03
1st Session of 2026
1. Coulomb’s law.
A) Directly proportional to field strength
B) Inversely proportional to distance between them
C) Directly proportional to square of distance
Answer
2. Resistance depends on.
A) Length
B) Cross-sectional area
C) Material and temperature
D) All of the above
Answer
3. Resistance is proportional to.
A) 1/A
B) A
C) A²
Answer
4. Power factor is.
A) Apparent power / True power
B) True power / Apparent power
C) Reactive power / Apparent power
Answer
5. Capacitor is combination of two.
A) Conducting and insulator
B) Non-conducting and insulator
C) Two insulators
Answer
A) Conducting and insulator
6. A thermistor is defined as which type of temperature-dependent resistor.
A) PTC (Positive Temperature Coefficient)
B) NTC (Negative Temperature Coefficient)
C) RTC (Resistance Temperature Constant)
Answer
7. Wheatstone bridge is used for.
A) Variable resistance
B) Current measurement
C) Precision measurement
Answer
8. Which of the following quantities are related to magnetism.
A) Absolute permittivity
B) Absolute permeability
C) Relative permeability
D) Both absolute permeability and relative permeability
Answer
9. Pressure measurement is related to which of the following effects.
A) Piezoelectric effect
B) Thermocouple effect
C) Photoelectric effect
Answer
10. Good shield has ______ permeability.
A) High
B) Low
C) Very low
Answer
11. Inductors and capacitors are used in.
A) AC but not in DC
B) DC but not in AC
C) Both AC and DC
Answer
12. The power factor of a pure sine wave AC circuit is.
A) 1.14
B) 1.0
C) 1.1
D) 1.41
Answer
B) 1.0
13. Parallel circuit formula.
A) Rt = (R1 × R2) / (R1 + R2)
B) Rt = (R1 + R2) / (R1 × R2)
C) Rt = R1 + R2
Answer
14. Which of the following materials is a good electrical insulator.
A) Copper
B) Aluminium
C) Glass
Answer
15. Which device is used to convert electrical energy into mechanical energy.
A) DC converter
B) DC motor
C) Transformer
Answer
B) DC motor
16. One milliampere (mA) is equal to which of the following.
A) One millionth of one ampere
B) One thousandth of one ampere
C) One tenth of one ampere
D) One millionth of admittance
Answer
17. The watt is the unit of which of the following quantities.
A) Magnetic flux
B) Power
C) Electromagnetic field strength
D) Breakdown voltage
Answer
18. Transformer efficiency depends on.
A) Copper and iron loss
B) Copper loss is greater than iron loss
C) Iron loss is less than copper loss
Answer
19. Motors are used for power factor improvement.
A) Synchronous motor
B) Asynchronous motor
C) Both
Answer
20. In AC generator alternator, where it is used.
A) High speed alternator
B) Low and medium alternator (engine driven)
C) Both alternators
Answer
21. the quantity of substance deposited during electrolysis of an electrolyte is governed by which law.
A) Faraday’s First Law of Electrolysis
B) Faraday’s Second Law of Electrolysis
C) Polarisation of electrolyte
Answer
22. 5A battery indication system is designed to alert the technician about which condition.
A) Battery voltage increasing
B) Battery working normally
C) Battery failing
Answer
23. A frequency selective device is formed using components.
A) Inductor and capacitor
B) Resistor and capacitor
C) Transformer and resistor
Answer
24. Induced electromotive force (EMF) is produced due to.
A) Produced due to heat
B) Produced due to resistance
C) Produced due to change in magnetic flux
Answer
25. Induced electromotive force (EMF) follows which principle.
A) Increases current always
B) Reduces voltage only
C) Opposes the cause producing it
Answer
26. Dew point is defined as.
A) The temperature at which condensation actually occurs
B) The temperature below which condensation occurs
C) The temperature above which condensation occurs
Answer
27. The battery which is reversible is called.
A) Primary cell
B) Secondary cell
C) Hydrometer
Answer
28. In parallel DC circuit voltage across branches is.
A) Less
B) More
C) Equal
Answer
29. In a parallel circuit, which of the following quantities remains the same across all branches and which one changes.
A) Voltage remains same, current changes
B) Current remains same, voltage changes
C) Charge remains same, voltage changes
Answer
30. Back EMF of a DC motor.
A) Often exceeds supply voltage
B) Aids the applied voltage
C) Helps in energy conservation
Answer ✅ Helps in energy conservation
Answer
31. Induction motor compared to DC motor is.
A) Superior
B) Equal
C) Inferior
Answer
32. The increasing order of magnetic properties of materials is.
A) Diamagnetic < Paramagnetic < Ferromagnetic
B) Ferromagnetic < Paramagnetic < Diamagnetic
C) Paramagnetic < Diamagnetic < Ferromagnetic
Answer
33. Which type of material is weakly magnetised in the same direction as the applied magnetic field.
A) Diamagnetic
B) Ferromagnetic
C) Paramagnetic
Answer
34. The transformation ratio of an autotransformer is generally which of the following.
A) Less than 1
B) Greater than 1
C) Usually equal to 1
Answer
35. One joule is equal to how many watt-seconds.
A) 1 watt in 1 second
B) 2 watt in 2 seconds
C) 1 watt in 2 seconds
D) 2 watt in 1 second
Answer
36. In a parallel circuit, which quantity remains the same across branches and which quantity changes.
A) Charge remains same, potential difference changes
B) Potential difference remains same, charge changes
C) Current remains same, voltage changes
Answer
37. In a step-up transformer, what happens to the current.
A) It increases along with voltage
B) It remains unaffected
C) It steps down in the same ratio as voltage increases
Answer
38. The ratio of back EMF (Eb) to supply voltage (V) in a DC motor indicates what.
A) Efficiency of the motor
B) Speed of rotation
C) Starting torque
Answer
39. During charging of a capacitor, the voltage across it varies in which manner.
A) Increases linearly
B) Increases instantly
C) Increases exponentially
Answer
40. An inductor behaves like a capacitor at condition.
A) At resonant frequency
B) At 50 Hz
C) At 5 Hz
Answer
41. The inductance of a coil is related to the number of magnetic flux lines in which way.
A) Directly proportional
B) Inversely proportional
C) Equal
Answer
42. A star connection in electrical systems is also known as what.
A) Mesh connection
B) Wye connection
C) Delta connection
Answer
43. When a battery is fully charged, it behaves like.
A) Open circuit
B) Short circuit
C) Resistance coil
Answer
44. The speed with which the effect of e.m.f is experienced at all parts of the conductor resulting in flow of current is called.
A) Magnetic field
B) Electric pressure
C) Electrical field
Answer
45. MTCS.
A) Electron is negatively charged and has definite mass
B) Electron is negatively charged and has negligible mass
C) Proton is positively charged and has no mass
Answer
46. In RLC circuit, if inductance increases then what will happen to resonant frequency.
A) Increase
B) Decrease
C) Same
Answer
47. For an alternating current system having a frequency of 50 Hz, the angular frequency is.
A) 50
B) 50/1
C) 100
D) 50/2
Answer
C) 100
Given: f = 50 Hz
Formula: ω = 2πf
Calculation: ω = 2 × π × 50 = 100π rad/s
Numerical value ≈ 314
If π not in options → use 2f = 100
Final: Actual = 100π, Exam = 100
48. A conductor has given resistance, cross-sectional area, and length. The resistivity of the material is.
A) 5 × 10⁻⁷ Ωm
B) 5 × 10⁻⁸ Ωm
C) 5 × 10⁻⁹ Ωm
Answer
Formula: ρ = (R × A) / L
Concept: Resistivity depends on material property & Units: Ωm
Resistivity: 5 × 10⁻⁷ Ωm
49. The power dissipated in a circuit when current is 2 A and resistance is 100 Ω is.
A) 20 W
B) 200 W
C) 400 W
Answer
Given: I = 2 A, R = 100 Ω
Formula: P = I²R
Calculation: P = (2)² × 100 = 4 × 100 = 400 W
50. An electrical device rated at 120 W and 120 V will draw current equal to.
A) 1 A
B) 2 A
C) 0.5 A
Answer
A) 1 A
Given: P = 120 W, V = 120 V
Formula: I = P / V
Calculation: I = 120 / 120 = 1 A
51. If a current of 6 A flows for 2 minutes, the total charge transferred is.
A) 12 C
B) 720 C
C) 20 C
Answer
B) 720 C
Given: I = 6 A, time = 2 min = 120 sec
Formula: Q = I × t
Calculation: Q = 6 × 120 = 720 C
52. Two inductors of 4 H and 6 H are connected in parallel with mutual inductance of 3 H opposing self-inductance. The equivalent inductance is.
A) 1.94 H
B) 0.94 H
C) 2.94 H
Answer
B) 0.94 H
Given: L₁ = 4 H, L₂ = 6 H, M = 3 H
Mutual inductance opposes
Concept Formula: Parallel + opposing → effective reduces
Final (standard result): L ≈ 0.94 H
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