DGCA Module 03 Electrical Fundamentals, 1st Session of 2017 covered electricity, All Laws, electrical units, AC/DC principles, resistors, circuit analysis, units and mixed type questions.
DGCA Module 03
1st Session of 2017
1. 1 watt = ___.
A) 600 J/s
B) 3600 J/s
C) 3600 J/hr
Answer
3. Which filter is used to pass low frequency but attenuates higher frequency.
A) Low pass
B) High pass
C) Band pass
Answer
4. Which is used to measure rate of flow of charge.
A) Coulomb
B) Ampere
C) Ampere/sec
Answer
5. Which is used for a particular band of frequency.
A) Band pass
B) Band stop
C) Band rejection
Answer
6. Which is used as a frequency selection device.
A) Oscillator
B) Rectifier
C) Filter
Answer
7. When cells are connected in series, voltage is.
A) Additive
B) Subtractive
C) Same as source voltage
Answer
8. Photo electric effect is used in.
A) Satellites
B) EGT
C) Microphone
Answer
9. Element having less than 4 electrons is.
A) Conductor
B) Insulator
C) Non-metal
Answer
10. Element consists of electrons having ___ charge and protons ___ charge.
A) +ve, -ve
B) -ve, +ve
C) -ve, -ve
Answer
11. Electron mass is.
A) Small
B) Large
C) Very small
Answer
12. Resistance is independent of.
A) Temperature
B) Mass of conductor
C) Material of conductor
Answer
13. Ni-Cd and Li-ion are ___ cells and Li batteries are ___ cells.
A) Primary, Secondary
B) Secondary, Primary
C) Secondary, Secondary
Answer
14. The 3rd band from left to right in a resistor indicates.
A) Multiplier
B) Tolerance
C) Error
D) 1st value
Answer
15. Color of green and blue indicates value.
A) 65
B) 66
C) 56
Answer
16. Kirchhoff’s current law is applicable to only.
A) Closed loop in a network
B) Electronic circuit
C) Junction in a network
D) Electric circuit
Answer
17. The 4th band indicates.
A) Multiplier
B) Tolerance
C) Value
Answer
18. Rheostat is used to vary current and potentiometer is used to vary voltage; both are.
A) Variable resistor
B) Fixed resistor
C) Variable capacitor
Answer
19. MTCS.
A) Inductance is more, more number of flux lines
B) Inductance is less, less number of flux lines
C) More inductance, less number of flux lines
Answer
20. Capacitance is ___ proportional to area.
A) Directly
B) Inversely
Answer
21. When capacitors are in series.
A) Plate separation increases, charge decreases
B) Plate separation decreases, charge increases
Answer
22. Transformer having no loss is called.
A) Voltage transformer
B) Step-up transformer
C) Ideal transformer
Answer
23. Reactive power is.
A) Power associated with inductive reactance of circuit
B) Power actually used in circuit
C) Power dissipated in circuit
D) None
Answer
24. To counteract the effect of field distortion, shifting the brushes is inconvenient, so which winding is used.
A) Field winding
B) Compensating winding
C) Armature winding
Answer
25. Construction of DC motor consists of.
A) Field assembly, brush, commutator
B) Armature field assembly, brush
C) Field assembly, armature assembly and end frame
Answer
26. Which property is associated with magnetism.
A) Permittivity
B) Coercivity
C) Both
Answer
27. A material has low permittivity.
A) Dielectric
B) Paramagnetic
C) Ferromagnetic
Answer
28. The magnet holds some of its magnetism; this property is called.
A) Reluctance
B) Retentivity
C) Permittivity
Answer
29. The opposition to magnetic lines of force is called.
A) Reluctance
B) Retentivity
C) Permittivity
Answer
30. Match the following: i. Flux ii. Flux density iii. Units.
A) I-b, ii-c, iii-a
B) I-a, ii-b, iii-c
Answer
31. Eddy current losses are reduced by.
A) Thick lamination
B) Thin lamination
C) Increasing current
Answer
32. RMS value is.
A) 1.414 × Vp
B) 0.707 × Vp
C) Vp
Answer
33. Three-phase induction motor is used because.
A) They look powerful
B) No need of phase sequence
C) High efficiency, self-starting, rugged
Answer
34. Transformer rating is given in.
A) kVAR
B) kW
C) kVA
D) All
Answer
35. Battery vent cap provides escape of ___ and allows exit of ___.
A) Gas, gas
B) Water, electrolyte
C) Gas, electrolyte
Answer
36. Numerical: r = 0.2 Ω/m, L = 20 m, V = 10 V. Current is.
A) 2.50 A
B) 25 A
C) 2.5 A
Answer
37. Trickle charging is required for.
A) Maintaining full charge
B) Only for lead-acid
C) High current condition
Answer
38. In a purely capacitive circuit.
A) Current leads voltage by 90°
B) Current lags voltage by 90°
C) Between 0° and 90°
Answer
39. When coil and magnetic field are parallel, induced voltage is.
A) Zero
B) Minimum
C) Maximum
Answer
40. Which is used for protection.
A) Shielding
B) Induction
C) Conduction
Answer
41. Unit of work is.
A) Joule
B) Joule/sec
C) Joule × sec
Answer
42. Element having more than four valence electrons is.
A) Conductor
B) Metal
C) Insulator
Answer
43. Electric current is defined as.
A) Drift of electrons
B) Generation of heat
C) Generation of light
Answer
44. Gravitational unit of force is.
A) Newton
B) Kilogram
C) Kilogram-weight
Answer
45. Kirchhoff’s Voltage Law is concerned with.
A) IR drops
B) Battery EMF
C) Junction voltage
D) Both A and B
Answer
46. According to KVL, algebraic sum in a loop is.
A) Zero
B) Positive
C) Negative
D) Depends
Answer
47. If thermistor temperature increases, resistance.
A) Increases
B) Decreases
C) Same
Answer
48. Gravitational unit of work is.
A) Joule
B) m-kg
C) Nm
Answer
49. The algebraic sign of an IR drop depends upon.
A) Current amount
B) Resistance value
C) Direction of current
D) Battery
Answer
50. In a parallel circuit, if one branch becomes open, what will happen.
A) Total resistance increases and total current decreases
B) Total resistance decreases
C) Entire circuit stops working
D) Voltage across remaining branches becomes zero
Answer
51. A voltage of 12 V is applied across a resistance of 6 Ω. The current is.
A) 0.5 A
B) 2 A
C) 6 A D) 72 A
Answer
B) 2 A
52. The charge flowing in a circuit is 10 Coulombs in 2 seconds. The current is.
A) 5 A
B) 0.2 A
C) 20 A
D) 12 A
Answer
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