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 an inductive circuit, the current________ the voltage?

is greater than

Leads

is less than

Lags

2.

Calculate the current across the 20 ohm resistor

20A

60A

10A

3.

Connecting two 28volt 60 Amp/Hour batteries in parallel will produce:

28V 60A/H

28V 120A/H

56V 60A/H

4.

Ion current is found in:

liquids and gasses

conductors and semi-conductors

semi-conductors

5.

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

Remains the same

Increases

Becomes zero

Decreases

6.

Armature reaction is caused by the:

reaction between the rotor heat and the stator cooling

torque reaction due to bearing friction

reaction between the main field and the armature field

7.

The capacity of a cell can be increased by:

Decreasing the area of the plates

increasing the number of the plates

increasing the amount of electrolyte

8.

The total resistance of three resistors in series of values R1=60ohm R2=20ohm R3=10ohm is:

90ohm

6ohm

48ohm

9.

Strength of the electric field is

Inversely proportional to the force applied

Directly proportional to the force applied

Directly proportional to the square of the force applied

Inversely proportional to the square of the force applied

10.

When comparing 2 alternating current waveforms, one is at its maximum value while the other is at zero. The two waveforms are:

of opposite phase angle

90° out of Phase

45° out of Phase

11.

Which among the following equations is incorrect?

V=Q/C

C=Q/V

Q=CV

Q=C/V

12.

A sine-wave voltage has a peak value of 180 volts. What is its value at 30°?

90 volts

120 volts

60 volts

13.

A charge of 12 coulombs moves past a given point in 2 seconds. Intensity of the charge flow in amps is:

6

24

10

14.

Wave and Lap windings are designed to give:

high ripple and low ripple respectively

high current and high voltage respectively

high voltage and high current respectively

15.

he 'Seebeck' effect is commonly found as the resultant current flow in

photoconductive cell

Thermocouple unit

ceramic pressure transducer

16.

In a parallel circuit, with a number of resistors, the voltage across each resistor is

The same for all resistors

Is divided equally among all resistors

Is divided proportionally across all resistors

17.

The state of charge of a lead/acid battery may be determined from the electrolyte:

level

weight

Specific gravity

18.

If 4 equal resistance conductors are connected in parallel their total resistance is:

a quarter the of one wire

half the resistance of one wire

an eighth of one wire

19.

If an EMF (Electromotive Force) of 120V is applied to a circuit of three equal value resistors in series and a current of 2A flows, the value of total resistance is:

60 ohm

80 ohm

20 ohm

20.

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

400 mH

200 mH

100 mH

21.

A capacitor consists of

Two dielectrics

Two insulators

Two conductors

Two semiconductors

22.

Of the following phases, which two are 180 degrees apart?

IR and IL

VC and VL

VL and VR

23.

In an RLC circuit, the power factor is always

Depends on the circuit

Zero

Positive

Negative

24.

Where the resistance of the load equals the internal resistance of the battery:

power in the load is at a maximum

circuit losses are at a maximum

voltage across the load is at maximum

25.

A sine wave has a periodic time of 0.5 milliseconds. What is the frequency?

20kHz

2kHz

200Hz

26.

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

56 volts

100 volts

200 volts

27.

The specific gravity of the electrolyte in a:

nickel-cadmium cell will be unchanged with a change in the state of charge

lead acid battery will remain fixed despite a change in the state of charge

nickel-cadmium cell will increase as the state of charge increases

28.

If the output of a generator drops from 100V with zero current flowing to 80V with 2A flowing then the internal resistance is:

90 ohm

120 ohm

10 ohm

29.

Two waveforms are 90 degrees out of phase:

when one peaks positive while the other passes through zero

both pass through zero at the same time but in opposite directions

both peak at the same time but one positive and one negative

30.

Calculate the total capacitance

15F

10F

13F

31.

Capacitor blocks__________ after long time.

direct current

neither alternating nor direct current

alternating current

both alternating and direct current

32.

When capacitors are connected in parallel, the total capacitance is always __________ the individual capacitance values.

Cannot be determined

Equal to

Greater than

Less than

33.

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

205 approximately

195 approximately

199 approximately

34.

A charge of 10 coulombs moves passed a point in 2 seconds. The flow in amps is:

5

12

20

35.

If a length of wire is cut in half and the two halves connected in parallel the resistance is”

Quarter of the original

Half the original

The same as the original

36.

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

an induction motor

a universal machine

a synchronous motor

37.

In a thermocouple, the EMF is produced by:

the difference in potential between hot and cold junctions

a self-contained battery

Connecting it to the aircraft battery

38.

When a changing pressure is applied to opposite faces of a crystal:

An electrical potential is generated

It distorts giving a mechanical energy output

It will be damaged because force should only be applied to adjacent faces

39.

Siemens is the unit name for:

inductance and is given the symbol H

resistivity and is given the symbol B

conductivity and is given the symbol G

40.

The retentivity of a material is given by

Remanence / Coercive Force

Coercive Force / Remanence

Coercive Force x Remanence

41.

Remanence is the:

magnetic flux in a material when saturation has been reached

remaining magnetic flux in a material after the magnetising force has been removed

the amount of force required to get the remaining magnetism back to zero

42.

The peak-to-peak value of a sine wave of 150V is:

424.4V

300 V

212.2V

43.

The negative plate of a discharged NiCad battery would be coated with?

Cadmium

Potassium Hydroxide

Cadmium Hydroxide

44.

When the current in circuit increases, Lenz’s law says that the self-induced voltage will:

In opposition to the increasing current

Aid the applied voltage

Tend to add to and increase the amount of current

45.

The value of a given waveform at any instant time is termed as

Waveform

Period

Cycle

Instantaneous value

46.

Time constant of an inductor is:

L/R

R/L

LR

47.

What is the resistance and tolerance value of a resistor colour coded, yellow, Violet and brown:

4.7 ohm +/-10%

470 ohm +/-20%

47ohm +/-20%

48.

The unit in which chemical energy produces opposite charges on 2 dissimilar metals is:

a battery cell

a photocell

a capacitor

49.

The dielectric in a capacitor is

an insulator

a conductor

a semiconductor

50.

An ion is:

a proton

an atom with unbalanced charges

a free- electron

51.

For very low frequencies, capacitor acts as

Open circuit

Short circuit

Amplifier

52.

A 10V battery supplies a resistive load of 10Ω. What is the power supplied?