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Worksheets

M3 Cat B Revision

Total questions: 37

Worksheet time: 19mins

Name
Class
Date
1.

Which of the figures below shows a delta star connected transformer?

a)
b)
c)
d)
2.

If the Tr=4:1 for a transformer, what type of transformer would it be?

a)

Step up Transformer

b)

Step down Transformer

c)

d)

e)

Unity

3.

If the Tr=1:5 for a transformer, what type of transformer would it be?

a)

Step up Transformer

b)

Step down Transformer

c)

d)

e)

Unity

4.

Which of the following are core losses found in a transformer?

a)

Copper losses

b)

Eddy currents

c)

Flux leakage

d)

Hysteresis loss

e)

Capacitive losses

5.

If a sine wave has a period time of 20ms what would its frequency be?

a)

50Hz

b)

400Hz

c)

100Hz

d)

20KHz

6.

on the graph showing a sinusoidal wave, what is being represented by the letter a?

a)

Vp-p

b)

Vp

c)

Vmean

d)

Vrms

7.

Which of the following graphs represents an AC voltage superimposed on a DC voltage?

a)
b)
c)
d)
8.

Which of the following components are used to extract the current from the armature on a rotating armature AC Generator.

a)

Slip rings

b)

Brushes

c)

Commutator

d)

Field Winding

e)

Pole shoe

9.

Which of of the following graph represents the output of the circuit shown?

a)
b)
c)
10.

12πfC\frac{1}{2\pi fC}  is used to calculate...

(a)  

11.

In a series LCR circuit, what is used as the reference in a phasor diagram?

a)

Is

b)

Vs

c)

P

d)

VL

e)

Ic

12.

If XC<XLX_C<X_L  then Voltage would lead Current in the circuit.

True or False

a)

True

b)

False

13.

An AC voltage measured on a Digital Multimeter reads as 120V. What is the rms value for the circuit tested?

a)

120 Vrms

b)

84.9 Vrms

c)

169.7 Vrms

d)

76.3 Vrms

14.

A symmetrical sine wave waveform has rms value of 14.14 volts and a frequency of 50 Hz.  Calculate peak to peak value

a)

40 Vp-p

b)

20 Vp-p

c)

28.28 Vp-p

d)

9.99 Vp-p

e)

19.98 Vp-p

15.

Fleming's right hand rule is for which electrical machine

a)

Motor

b)

Generator

c)

Transformer

d)

Transducer

16.

Which of these circuit symbols represents a band pass filter

a)
b)
c)
d)
e)
17.

Which of the graphs below shows the characteristics for the circuit shown?

a)
b)
c)
d)
e)
18.

What is the purpose of the commutator?

a)

To reverse the current in the armature

b)

To reverse the current in the field windings

c)

To protect the slip ring from damage

d)

To allow constant motion of the rotor

e)

To allow the motor to be used as a generator

19.

What name is given to the current carried conductor in a motor?

a)

Armature

b)

Comutator

c)

Rotor

d)

Stator

e)

Pole Pair

20.

The Construction of what device is shown in the figure?

a)

Flywheel

b)

DC Machine

c)

Permanent Magnet

d)

Transformer

21.

What does the inductance of a coil depend on?

Select all correct answers

a)

Number of turns

b)

Cross-sectional area

c)
Temperature of the surroundings
d)

Thickness of the conductor

e)

Core material

22.

When the power is removed from an inductive coil which direction will the current flow?

a)
In the same direction
b)
In the opposite direction
c)
The current will flow in a circular direction
d)
There will be no current flow
23.

What safety precautions should you take when using a current transformer when measuring the current in a feeder line?

a)

There should always be a load on the secondary side

b)

There must only be a load on the primary side

c)

It can only be used on unbalanced loads

24.

Where would you find a freewheeling diode?

a)

In a circuit parallel to an inductive load

b)

In a circuit in series with a resistive load

c)

In a circuit in series with a capacitive load

d)

In a circuit in series with an inductive load

e)

In a circuit parallel to a capacitive load

25.

what determines the direction of the induced voltage in a current carrying conductor?

a)

Only the direction of the magnetic field

b)

The direction of the magnetic field and the way the coil is wound

c)

Both the direction of the magnetic field and the movement of the conductor

d)

Only the direction of movement of the conductor

26.

what is inducted into a conductor when it is moved through a magnetic field?

a)

Inductance

b)

Voltage

c)

Current

d)

Magnetic field

27.

What is the basic principle of Lenz's law?

a)
Ignores the change that produced it
b)
Opposes the change that produced it
c)
Amplifies the change that produced it
d)
Supports the change that produced it
28.

In Flemings right hand rule, what is represented by the letter a?

a)

Conventional Current flow in the conductor

b)

Electron flow in the conductor

c)

Movement of the conductor

d)

Magnetic Field direction (North to South)

29.

In Flemings right hand rule, what is represented by the letter c?

a)

Conventional Current flow in the conductor

b)

Electron flow in the conductor

c)

Movement of the conductor

d)

Magnetic Field direction (North to South)

30.

WRT the generator principle which of the following factors would influence the magnitude of the induced voltage in the conductor?

a)

The polarity of the supply

b)

The direction of the magnetic field

c)

The magnetic flux density

d)

The current strength

31.

If you increase the frequency of the ac supply to an inductor, you would

a)

decrease the impedance

b)

increase the current flow through the inductor

c)

cause a short circuit

d)

increase the induced voltage

32.

The Farad is the unit of what electrical term?

a)

Inductance

b)

Capacitance

c)

Magnetic flux density

d)

Magnetic field strength

e)

Conductance

33.

The Henry is the unit of what electrical term?

a)

Inductance

b)

Capacitance

c)

Magnetic flux density

d)

Magnetic field strength

e)

Conductance

34.

The Siemen is the unit of what electrical term?

a)

Inductance

b)

Capacitance

c)

Magnetic flux density

d)

Magnetic field strength

e)

Conductance

35.

The Tesla is the unit of what electrical term?

a)

Inductance

b)

Capacitance

c)

Magnetic flux density

d)

Magnetic field strength

e)

Conductance

36.

How does inductance oppose changes in current?

a)
By increasing the current flow
b)
By producing a magnetic field that supports the change in current
c)
By reducing the voltage in the circuit
d)
By producing a voltage that opposes the change in current flow
37.

If you increase the frequency in a series reactive circuit which of these statements are true?

Select all correct answers

a)

The circuit would become more inductive

b)

The circuit would become more capacitive

c)

The supply voltage and current would always be in phase

d)

The circuit would become more ohmic

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