Module 3 New 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.

What is the duration of one cycle known as

Instantaneous value

Period

Waveform

Peak value

2.

Which among the following equations is incorrect?

C=Q/V

V=Q/C

Q=C/V

Q=CV

3.

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:

20 ohm

80 ohm

60 ohm

4.

A circuit has a resistance of 2 ohms connected in series with a capacitance of 6F. Calculate the discharging time constant.

12

3

8

1

5.

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

IR and IL

VL and VR

VC and VL

6.

What is the power factor of a series RLC circuit under resonance condition?

0

1

Infinity

7.

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

45° out of Phase

90° out of Phase

8.

9.

A component is required to give a negative temperature coefficient value. It is likely to be made of:

aluminium

copper

carbon

10.

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

Cadmium Hydroxide

Cadmium

Potassium Hydroxide

11.

If 2V is supplied to a 3F capacitor, calculate the charge stored in the capacitor

3C

1.5C

6C

12.

A synchronous ac motor is most useful for applications requiring:

constant speed such as ventilation fans

varying loads such as fuel booster pumps

intermittent loads such as control surface or door operations

13.

In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor etc

Current

Neither voltage nor current

Voltage

Both voltage and current

14.

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

28V 60A/H

56V 60A/H

28V 120A/H

15.

The commutator segments of a generator will:

change direct current into alternating current every half cycle

prevent excessive armature reaction by changing over every cycle

reverse the loop connections to the brush every half cycle

16.

High torque low speed is given by:

series DC motor

shunt DC motor

compound DC motor

17.

In the diagram the resultant current is:

2mA

1.5mA

10mA

18.

Friction can induce electrostatic charge of very:

high voltage on insulated surfaces

ow voltage on insulated surfaces

high voltage on conducting surfaces

19.

Air has a dielectric constant of

Infinity

Unity

Zero

20.

What is the effective value of current?

RMS current

Instantaneous current

Average current

21.

Wave and Lap windings are designed to give:

high ripple and low ripple respectively

high voltage and high current respectively

high current and high voltage respectively

22.

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

N/C

C

C/N

CN

23.

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

zero

90

45

24.

Ohms Law states if the temperature stays constant the:

current flowing in a circuit is proportional to the voltage but inversely proportional to the resistance

voltage across the circuit is equal to the sum of all the voltage drops in that circuit

current flowing in a circuit is proportional to the resistance but inversely proportional to the voltage

25.

In accordance with Faraday’s Laws, the three prime factors affecting generated emf are:

Length of conductor, flux density, velocity of conductor

Resistivity of conductor, flux density, velocity of conductor

Length of conductor, flux, velocity of conductor

26.

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

Decreases

Becomes zero

Increases

Remains the same

27.

In an induction motor:

a rotor with no connections follows a rotating magnetic field

the armature and field coils are connected in series

a DC –energised rotor follows a rotating magnetic field

28.

Battery cells are connected in parallel to:

increase the internal resistance

increase the current capacity

increase the voltage output

29.

The power factor of an alternating current circuit is:

the cosine of the phase angle

the sine of the phase angle

the tangent of the phase angle

30.

Capacitor blocks__________ after long time.

alternating current

direct current

neither alternating nor direct current

both alternating and direct current

31.

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

200 mH

400 mH

100 mH

32.

What is the total capacitance when two capacitors C1 and C2 are connected in series?

(C1+C2)/C1C2

C1C2/(C1+C2)

C1+C2

1/C1+1/C2

33.

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:

2A

6A

18A

34.

If four Identical cells of 2.2 volt and 15 amp/hour (A/H) capacity are connected in series the voltage and A/H will be:

8.8V 15A/H

8.8V 60A/H

2.2V 15A/H

35.

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

0.0025 seconds

0.006 seconds

0.004 seconds

36.

The reciprocal of Resistance is:

Conductance

Insulation

Charge

37.

Inductance is _____________________ to number of turns in the coil.

inversely proportional

equal

directly proportional

38.

Coercive force is the:

max magnetic strength of a material once magnetising force removed from coil

max magnetic strength of a material even if magnetising force increased

magnetising force required to cancel magnetic strength of a material

39.

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

8

18

32

40.

The generator characteristic of:

high current and low voltage are found in a wave winding format

high current and low voltage are found in a lap winding format

low current and high voltage are found in a lap winding format

41.

A 2uF capacitor has 50 volts applied. The stored charge is:

25 X 10^-6 C

50 X 10^-6 C

100 X 10^-6 C

42.

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

100 volts

200 volts

56 volts

43.

In order to produce a substantial voltage and current from photovoltaic cells they should be connected in:

parallel with each other

series parallel arrangement

series with each other

44.

The combination of two 0.02uF 500V capacitors in parallel has a capacitance and working voltage rating of:

0.04uF 500V

0.01uF 1000V

0.02uF 500V

45.

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

Specific gravity

weight

level

46.

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

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

An electrical potential is generated

It distorts giving a mechanical energy output

47.

The best shield for a steady magnetic field is a:

magnetic shield with low permeability

magnetic shield with high permeability

Material with a high resistance

48.

Assuming the voltage stays constant. Deceasing the distance between the plates of a capacitor will:

have no effect on the amount of charge that can be stored

decrease the amount of charge that can be stored

increase the amount of charge that can be stored

49.

A 10 centimeter rod of specific resistance 0.5 and a cross sectional area of 1 centimeter, has a resistive value of:

2 Ω

5 Ω

1 Ω

50.

The filament of a lamp measures 2.5ohm when cold. With 120 volts applied across the filament, the lamp dissipates 60 Watts. What is the hot resistance of the lamp?

2 ohms

240 ohms

300 ohms

51.

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

199 approximately

205 approximately

195 approximately

52.

The voltage waveform in an ideal inductance would be: