DC machines are devices which work by the use of electromagnetism just like transformers, solenoids, relays, etc. However, they have an additional hazard which is:

Which of these is/are NOT a part of a d.c. generator?

Which part of a d.c. generator converts the a.c. produced in the coil into d.c. at the generator terminals?

The process of generating an EMF in a conductor is called:

The single loop generator shown, produces maximum output at the:

(select all that apply)

Generators get their mechanical power from:

Generators are devices that convert

_______ energy into _______ energy.

The direction of an induced EMF is determined using:

In Fleming’s left-hand rule, what does the index finger (first finger) indicate?

A d. c. machine has which of the following parts?

(tick all that apply)

What material is the yoke (frame) of a d. c. machine made of?

Which voltage graph shows the output at the terminals of a d. c. generator?

A d. c. machine may operate as either a motor or a generator.

d. c. generators always need an external source of d. c. to power to the shunt field.

To build up an initial generated EMF, self-excited

d. c. generators require:

How many parallel paths are there in a four pole wave wound armature?

To increase conductor length and produce a higher EMF, a practical d. c. generator uses:

The metal piece that a field coil is mounted on is called a:

The speed and supply voltage respectively, of the motor whose nameplate is pictured are:

A 200V field coil test yields the following values:

coil 1 = 0V, coil 2 = 0V, coil 3 = 0V, coil 4 = 200V

A 4 pole lap wound d. c. shunt generator has 300 conductors, a magnetic flux of 60mWb per pole and runs at a speed of 1600rpm. Its generated voltage is: $$E_g=\frac{\theta Znp}{60a}$$    

A 200V field coil test yields the following values:

coil 1 = 55.2V, coil 2 = 54.6V, coil 3 = 55.8V, coil 4 = 34.4V

 $E_g=V_T+I_aR_a$  

A d. c. generator has the following parameters:
Eg = 200; Ia = 45A; Rsh = 140Ω; Ra = 0.2Ω
Calculate the terminal voltage VT

Which of the following is NOT a prime mover for a d. c. generator?

Which of the following d. c. generators is used in low cost applications?

Which of the following d. c. generators is used for

general-purpose applications?

The output of a separately excited d. c. generator can be reversed by:

In the image shown, the two axes have been identified for you. What is represented by the letters 'A' and 'B' respectively?

When a shunt d. c. generator is operated at rated speed without load, which of the following could be easily measured?

When d. c. generators are operated at rated speed and fully loaded, which of the following must be measured to determine the output power?

 $P_{out}=\frac{2\pi NT}{60}$  A d. c. motor has the following parameters: Torque = 34.25Nm; speed =1450RPM

Which d. c. motor should never be run on no-load because of the likelihood of over-speeding?

Minimum Energy Performance Standards (MEPs) do not apply to d. c. machines in Australia.

The image shows the relationship between Fixed losses (Fe), variable losses (Cu) and efficiency.

The maximum efficiency is;

Armatures use silicon steel in their construction to:

The silicon steel used in armature construction is laminated to:

Copper losses in a DC Machine are caused by:

Fixed losses in a d. c. machine are determined by doing a:

Permanent magnet, separately excited, and shunt motors, all have a similar speed regulation.

The best motor for reasonable speed regulation and intermittent load changes is the:

The image shows four d. c. motor connection types.

From left to right and down they are:

The image shows the load characteristic for a shunt generator.

What does point 'A' represent?

The image shows the load characteristic for a shunt generator.

What does point 'B' represent?

The image shows the load characteristic for a shunt generator.

What does point 'C' represent?