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.

In an inductive circuit, the current________ the voltage?

Leads

is greater than

is less than

Lags

None

2.

One of the laws of magnetism states-'the force between two magnetic poles of constant strength is:

inversely proportional to the distance between them'

proportional to the distance between them'

inversely proportional to the square of the distance

None

3.

In order to obtain a high value for capacitance, the permittivity of the dielectric medium should be?

Unity

High

Low

Zero

None

4.

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

12

1

8

3

None

5.

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

195 approximately

199 approximately

205 approximately

None

6.

In a high pass filter the:

inductance must be in series with the load, with shunt R or C across the line

resistance must be in series with the load, with shunt L or C across the line

capacitance must be in series with the load, with shunt R or L across the line

None

7.

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

1.2 Kohm

120 Kohm

23 Kohm

None

8.

In shaded pole induction motor if the supply current is reversed the motor will:

stop

maintain direction

change direction

None

9.

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

0.1 msec

0.01 sec

0.1 sec

0.01 msec

None

10.

A Semi-conductor will have:

two electrons in the outer shell

eight electrons in the outer shell

four electrons in the outer shell

None

11.

The negative electrode (plate) of a fully charged lead- acid cell is:

lead peroxide

spongy lead

lead sulphate

None

12.

In an RLC circuit, the power factor is always

Depends on the circuit

Zero

Negative

Positive

None

13.

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

a battery cell

a capacitor

a photocell

None

14.

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

0.707 x Vsupply

0.632 x Vsupply

Vsupply

None

15.

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

Increases

Decreases

Becomes zero

Remains the same

None

16.

What is the duration of one cycle known as

Instantaneous value

Waveform

Period

Peak value

None

17.

Conventional current is:

in the direction of positive charges in motion

never used for analysing electrical circuits

in the direction of electron flow

None

18.

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

5mA

0.5A

0.5mA

None

19.

If a pure capacitance and a pure inductance of equal reactance are in series the supply current is:

Out of phase with the voltage

in phase with voltage

less than 90° to the voltage

None

20.

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

Length of conductor, flux density, velocity of conductor

Length of conductor, flux, velocity of conductor

Resistivity of conductor, flux density, velocity of conductor

None

21.

In a purely inductive circuit the current:

leads the voltage by 2pi radians

leads the voltage by pi radians

lags the voltage by pi/2 radians

None

22.

Battery cells are connected in parallel to:

increase the voltage output

increase the current capacity

increase the internal resistance

None

23.

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 mH

4 mH

16 mH

None

24.

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

Tend to add to and increase the amount of current

In opposition to the increasing current

Aid the applied voltage

None

25.

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

2uF

22uF

20uF

None

26.

Time constant of an inductor is:

L/R

LR

R/L

None

27.

A charge of 100C exists when a voltage of 200V is applied to a capacitor. What value is the capacitor?

20000F

0.5F

2F

None

28.

A circuit with a current of 6A has it's resistance doubled the new current is:

3A

24A

12A

None

29.

The unit of Siemens with the symbol G is:

Conductance

Resistance

Reactance

None

30.

An electrical force is produced when:

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

a conducting closed loop is passed through a magnetic field

a conducting closed loop is at rest in a magnetic field

None

31.

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

200 volts

100 volts

56 volts

None

32.

Compensation windings are:

cut into the faces of the main poles

wound around the pole pieces between main poles

wound around the armature in the opposite direction

None

33.

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

424.4V

300 V

212.2V

None

34.

The field strength of a direct current shunt motor on constant load is reduced, what is the effect on speed and torque?

decreased speed decreased torque

increased speed, torque unchanged

increased speed, increased torque

None

35.

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:

6A

2A

18A

None

36.

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

circuit losses are at a maximum

voltage across the load is at maximum

power in the load is at a maximum

None

37.

High torque low speed is given by:

compound DC motor

series DC motor

shunt DC motor

None

38.

Air has a dielectric constant of

Zero

Unity

Infinity

None

39.

In an electrical circuit, EMF (electro motive force) and PD (potential difference):

can only be the same with correct load matching

are the same with no load applied

will only be the same if internal resistance is negligible

None

40.

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?

240 ohms

300 ohms

2 ohms

None

41.

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

Cycle

Instantaneous value

Waveform

Period

None

42.

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

a synchronous motor

an induction motor

a universal machine

None

43.

Some materials emit electrons to a light source. These are:

Piezoelectric cells

Photovoltaic cells

Thermoelectric cells

None

44.

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

12

33

108

None

45.

One unit of Potential Difference is:

a movement of 6.25 x10^18 electrons between 2 points

equal to one joule of work per coulomb of charge

inversely proportional to the resistance in the circuit

None

46.

A 3 phase induction motor can be reversed by:

changing any 2 phases

reversing the supply

changing all three phases

None

47.

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

20

5

12

None

48.

Which of the following is a low pass filter?

L type with series ‘C’ and shunt ‘L’

L type with series ‘L’ and shunt ‘C’

T type with series ‘C’ and shunt ‘L’

None

49.

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:

4.5Ω

31.5Ω

12Ω

None

50.

If the time constant for a capacitor is 10us the time taken for the to reach the fully charged condition is approximately:

10 X 6.32 us

50us

10us

None

51.

If the current through x ohm resistance in the circuit is 5A, find the value of x

135 ohm

12 ohm

27 ohm

5 ohm

None

52.

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