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.

The circuit shown represents a:

high pass filter

low pass filter

parallel tuned circuit

2.

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

3.

The electrolyte solution used in an alkaline battery is:

Potassium Hydroxide

Sulphuric Acid

Lead Sulphate

4.

What will happen to the frequency if the number of revolutions increases?

Remains the same

Decreases

Increases

Becomes zero

5.

When the voltage across a capacitor increases, what happens to the charge stored in it?

Decreases

Becomes zero

Increases

6.

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

Kirchhoff

Faraday

Lenz

7.

The power factor of an alternating current circuit is:

the sine of the phase angle

the cosine of the phase angle

the tangent of the phase angle

8.

In an induction motor:

the armature and field coils are connected in series

a rotor with no connections follows a rotating magnetic field

a DC –energised rotor follows a rotating magnetic field

9.

Ion current is found in:

conductors and semi-conductors

liquids and gasses

semi-conductors

10.

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

N/C

CN

C/N

C

11.

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

Decreases

Increases

Remains the same

Becomes zero

12.

Three capacitors having a capacitance equal to 2F, 4F and 6F are connected in parallel. Calculate the effective parallel.

10F

12F

11F

13.

An electrical force is produced when:

a conducting closed loop is at rest in a magnetic field

a conducting closed loop is passed through a magnetic field

a steady magnetic field is applied to a stationary conducting closed loop

14.

Unit of capacitance is

Farad

Henry

Volts

15.

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

195 approximately

205 approximately

199 approximately

16.

Which of the following is a low pass filter?

L type with series ‘C’ and shunt ‘L’

T type with series ‘C’ and shunt ‘L’

L type with series ‘L’ and shunt ‘C’

17.

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

a universal machine

a synchronous motor

an induction motor

18.

In a capacitive circuit, if the frequency is increased:

the current increases

reactance remains the same

impedance increases

19.

The Electron Valence of an Element with 5 electrons is:

5

3

1

20.

A low value of voltage in a very:

low resistance circuit produces a very large current

high resistance produces a very large current

low resistance produces a very low current

21.

If in an alternating current circuit, impedance is 26 ohm, capacitive reactance is 24 ohm, what is the resistance?

10 ohm

2 ohm

25 ohm

22.

In an inductive circuit, the current________ the voltage?

is less than

is greater than

Lags

Leads

23.

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

0.01 sec

0.1 sec

0.01 msec

0.1 msec

24.

When a capacitor is charged after 1 time constant the V across the capacitor.

Vsupply

0.632 x Vsupply

0.707 x Vsupply

25.

Friction can induce electrostatic charge of very:

high voltage on insulated surfaces

high voltage on conducting surfaces

ow voltage on insulated surfaces

26.

Siemens is the unit name for:

inductance and is given the symbol H

conductivity and is given the symbol G

resistivity and is given the symbol B

27.

Battery cells are connected in parallel to:

increase the current capacity

increase the voltage output

increase the internal resistance

28.

What is the value of capacitance of a capacitor which has a voltage of 4V and ha 8C of charge?

4F

2F

8F

29.

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

circuit losses are at a maximum

power in the load is at a maximum

voltage across the load is at maximum

30.

What happens to the current in the series circuit if the resistance is doubled?

It becomes half its original value

It becomes double its original value

It becomes infinity

It becomes zero

31.

A resistor colour coded Brown, Red, Red, Silver the value is:

120 Kohm

23 Kohm

1.2 Kohm

32.

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

6.25 watts

100 watts

20 watts

33.

An ion is:

a proton

a free- electron

an atom with unbalanced charges

34.

Armature reaction is caused by the:

reaction between the main field and the armature field

reaction between the rotor heat and the stator cooling

torque reaction due to bearing friction

35.

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:

80 ohm

60 ohm

20 ohm

36.

37.

38.

For very low frequencies, capacitor acts as

Open circuit

Short circuit

Amplifier

39.

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

VL and VR

IR and IL

VC and VL

40.

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

ceramic pressure transducer

photoconductive cell

Thermocouple unit

41.

In a star connected system, the phase voltage is:

the same as the line voltage

line voltage ÷ 1.73

line voltage × 1.73

42.

Which among the following equations is incorrect?

Q=CV

V=Q/C

C=Q/V

Q=C/V

43.

What is the correct relation between the peak value and peak to peak value for a sinusoidal waveform?

Vp-p=2Vp

Vp=Vp-p

Vp=2Vp-p

Vp=4Vp-p

44.

The commutator segments of a generator will:

prevent excessive armature reaction by changing over every cycle

change direct current into alternating current every half cycle

reverse the loop connections to the brush every half cycle

45.

The speed of an ac motor can be affected by varying the:

armature current

field current

number of pairs of poles

46.

The current in a circuit is 6 amps the amount of charge moved in 25 seconds is:

0.24 coulombs

150 coulombs

4.16 coulombs

47.

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

6ohm

90ohm

48ohm

48.

A 3 phase induction motor can be reversed by:

changing all three phases

changing any 2 phases

reversing the supply

49.

In a purely inductive circuit the current:

leads the voltage by pi radians

leads the voltage by 2pi radians

lags the voltage by pi/2 radians

50.

Three capacitors of value 4uF, 6uF and 12uF are connected in parallel. The total circuit capacitance is:

20uF

22uF

2uF

51.

Wave and Lap windings are designed to give:

high current and high voltage respectively

high voltage and high current respectively

high ripple and low ripple respectively

52.

A charge of 36 coulombs moves passed a point in 3 seconds. The flow in amps is: