Free Printable Module 7745 Chapter E

1.

How many Radians are there in a circle

a)

$2\pi$

b)

$4\pi$

c)

$\pi$

d)

$\frac{\pi}{2}$

2.

For a sine wave, what is the relationship between the rms value and the peak value?

a)

The rms value is 0.707 x peak value

b)

The peak value is 0.707 x rms value

c)

The rms is twice the value of peak value

d)

The rms is half the value of peak value

3.

In the equation

$True\ power\ =V\times I\times\cos\theta$

what does $\cos\theta$ represent?

a)

The Power Factor

b)

Apparent power

c)

The reactive component of the circuit

d)

The resistive component of the circuit

4.

What does a polyphase system refer to?

a)

Any system with more than one phase

b)

Any symmetrical phased system

c)

Any balanced phased system

d)

Any 3 phased system

5.

If all voltage outputs of a 3 phase 115Vac Generator were vector summed to together, what would be the Total Voltage?

a)

0 Vac

b)

200 Vac

c)

115 Vac

d)

345 Vac

6.

Select all correct statements for a symmetrical 3 phase system.

Select 1 or more answers

a)

The supply Voltage to each phase have the same frequency

b)

The supply current to each phase have the same magnitude

c)

There is equal phase displacement

d)

The current in the line conductors are equal

7.

What is the relationship between the current magnitudes in a 3 phase Delta connected system?

a)

$I_L=\sqrt{3}I_P$

b)

$I_L=I_P$

c)

$I_P=\sqrt{3}I_L$

d)

$I_P=I_LCos\theta$

8.

What is the relationship between the current magnitudes in a 3 phase Star connected system?

a)

$I_L=\sqrt{3}I_P$

b)

$I_L=I_P$

c)

$I_P=\sqrt{3}I_L$

d)

$I_P=I_LCos\theta$

9.

Which of the following formula will give you the total power for a 3 phase star connected system?

a)

$3\times V_P\times I_P\times Cos\theta$

b)

$\sqrt{3}\times V_P\times I_P\times Cos\theta$

c)

$\sqrt{3}\times V_P\times I_L\times Sin\theta$

d)

$3\times V_L\times I_L\times Sin\theta$

Module 7745 Chapter E

Total questions: 9

Worksheet time: 5mins

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