Module 3

Module 3 quiz contains 52 question based on the syllabus for module 3 examination for B1.1, B1.3 and B2 category.

The time limit for the quiz is 65 min.

The number of attempts allowed are unlimited.

All the best.

Name
1. 
In the diagram an unknown resistance is being measured using a Wheatstone bridge. The bridge is balanced. The unknown resistance is:

2. 
An alternating current generator is operating at 50kVA in a circuit with a power factor of 0.8. The real power is

3. 
Three branches in a circuit have currents entering of 3A, 4A and 5A. A fourth branch has 10A leaving. A fifth branch must have:

4. 
The average Value of an "alternating current" voltage is calculated as:

5. 
An inductor of 50mH is connected in series with a resistance of 10kΩ. The time taken for the current to reach 63.2% of the maximum is:

6. 
In an RLC circuit, the power factor is always

7. 
Diamagnetic materials have a permeability of:

8. 
The aircraft power supply frequency is 400 hertz. The period is:

9. 
The maximum variation between the maximum positive and the maximum negative value is known as?

10. 
A synchronous ac motor is most useful for applications requiring:

11. 
When making up electrolyte for lead acid batteries:

12. 
A 24V source is connected across a 30 Kohm resistor. In order to achieve a current flow of 6mA the resistor must be changed to

13. 
An alternating current circuit contains resistance and no reactance the phase angle between voltage and current will be:

14. 
Two 10V 20AH batteries are connected in parallel and connected across a 10Ω load. How long could they supply the required load current before the voltage began to decay?

15. 
The retentivity of a material is given by

16. 
5 amps passes through a 4 ohm resistor, the amount of power the resistor has to dissipate is:

17. 
The power factor of an alternating current circuit is:

18. 
Unit of capacitance is

19. 
Calculate the time constant of a series RC circuit consisting of a 100microF capacitor in series with a 100ohm resistor.

20. 
In a lead acid cell, there are:

21. 
A coil induces 200 mV when the current changes at the rate of 1 amp per second. The inductance L is:

22. 
Calculate the current across the 20 ohm resistor

23. 
A transformer has 100V applied to the primary. If the ratio is 1:3 and the secondary current is 6A, the primary current will be:

24. 
A generator produces Voltage by:

25. 
What is relative permittivity?

26. 
The charge of 25 x 10^18 electrons is Approximately:

27. 
An alternating current series circuit contains resistance of 100 ohms, XL reactance of 100 ohms and XC reactance of 100 ohms. The impedance will be:

28. 
The unit of Siemens with the symbol G is:

29. 
Two resistors in parallel. If they are of unequal value it is true that:

30. 
An AC motor which rotates at the same speed as supply frequency is called:

31. 
A coil has an inductance of 8 mH with 125 turns. When the number of turns is doubled within the same length, the inductance will become:

32. 
If the resistance of a conductor is 10Ω then it’s conductance is?

33. 
When the supply frequency increases, what happens to the capacitive reactance in the circuit?

34. 
The torque speed characteristic of a series motor is:

35. 
Battery cells are connected in parallel to:

36. 
An AC generator connected in star with a phase voltage of 115v will have a line voltage of:

37. 
What is the maximum number of Electrons in the N shell of an Atom?

38. 
For very low frequencies, capacitor acts as

39. 
N capacitors having capacitance C are connected in series, calculate the equivalent capacitance.

40. 
The Electron Valence of an Element with 5 electrons is:

41. 
Air has a dielectric constant of

42. 
An eight pole generator rotates at 6,000 RPM. The frequency produced is:

43. 
In the Diagram the two unknown resistors are of equal value and their value is:

44. 
The statement that "the sum of all voltages around any closed path must equal the applied voltage" is attributed to:

45. 
A battery of 18V with an internal resistance of 1.5Ω is connected in a circuit with three resistors in parallel of values 6Ω, 12Ω and 12Ω. The total circuit resistance is:

46. 
An alternating current voltage waveform has a root mean square value of 70.7 volts the peak voltage is:

47. 
20 volts is applied across two resistors in series one 10 Kohm the other 30 Kohm. The current taken from the battery will be:

48. 
In a magnetic circuit:

49. 
What is the effective value of current?

50. 
Resistance is:

51. 
The voltage waveform in an ideal inductance would be:

52. 
In a parallel network of resistors which are unequal the current is:

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