Free Printable M3 Cat B bank

1.

What is the value of Z in the circuit shown?

a)

$3\Omega$

b)

$10\Omega$

c)

$14\Omega$

d)

$2\Omega$

2.

What is the value of R in the circuit shown?

a)

$12\Omega$

b)

$6\Omega$

c)

$24\Omega$

d)

$17.5\Omega$

3.

Which of these statements is true if you change the voltage from 28V dc to 28V ac in a resistive circuit?

a)

The real power decreases

b)

The real power remains the same

c)

the apparent power increases

d)

the reactive power decreases

e)

The reactive power decreases

4.

True or False

If the frequency of the supply increases then the capacitive reactance increases

a)

False

b)

True

5.

Which component would increase its opposition to current flow with a decrease in frequency?

a)

Inductance

b)

Diode

c)

Capacitance

d)

Resistance

6.

What is the cause of reactive sparking?

a)

The meeting of the brushes and the coils within the neutral zone

b)

The meeting of the brushes and the coils outside the neutral zone

c)

running the motor at high speeds at altitude

d)

Running a series motor without a load.

7.

Where are the compensation windings in a dc machine?

a)

Between the main poles

b)

Around the Interpole

c)

In the armature

d)

In the main field winding

8.

Which of the following power triangles is correct?

a)

b)

c)

d)

9.

Within a soft magnetic cored transformer, which losses are associated with heat loss?

a)

vibration losses

b)

magnetic losses

c)

iron losses

d)

copper losses

e)

Friction losses

10.

Which formula is correct for expressing the transformation of resistance?

a)

$T_r^2=\frac{R_1}{R_2}=\frac{N_1^2}{N_2^2}$

b)

$T_r^2=\frac{R_2}{R_1}=\frac{N_1^{ }}{N_2^{ }}$

c)

$T_r^{ }=\frac{R_2^2}{R_1^2}=\frac{N_1^{ }}{N_2^{ }}$

d)

$T_r^{ }=\frac{R_2}{R_1}=\frac{N_1^{ }}{N_2^{ }}$

11.

A transformer converts 440V to 110V and N₂ has 50 turns. How many turns will N₁ have?

a)

12

b)

100

c)

200

d)

400

12.

Where do iron losses occur in a transformer?

a)

In the core of the transformer

b)

In the windings of the transformer

c)

In the insulation of the transformer

d)

In the cooling system of the transformer

13.

Where do copper losses occur in a transformer?

a)

In the cooling system of the transformer

b)

In the core of the transformer

c)

In the insulation of the transformer

d)

In the winding of the transformer

14.

What happens to the current in a step down transformer with a turn ratio of 6:1

a)

the current increases by a factor of six

b)

the current decreases by a factor of six

c)

the current remains the same

d)

the current decreases by a factor of thirty six

15.

How are aircraft electrical systems that require 200V connected?

a)

between 2 phases

b)

between a single phase and neutral

c)

between 3 phases

16.

How is a band stop filter created?

a)

By using a band-pass filter

b)

By combining a low-pass filter and a high-pass filter in parallel.

c)

By combining a low-pass filter and a high-pass filter in series.

d)

By using only a high-pass filter

17.

WRT earth what would the voltage be at point A

a)

72V

b)

48V

c)

36V

d)

12V

18.

WRT earth what would the voltage be at point B

a)

72V

b)

48V

c)

36V

d)

12V

19.

What is the total resistance in the circuit?

a)

$40\Omega$

b)

$1\Omega$

c)

$20\Omega$

d)

$10\Omega$

20.

What power would be consumed by the resistor in the circuit shown?

a)

960W

b)

120W

c)

1800W

21.

What is the voltage drop over R₄?

a)

75V

b)

40V

c)

85V

22.

What would the value of R1 be if the ammeter reads 0A?

a)

$4\Omega$

b)

$10\Omega$

c)

$3\Omega$

d)

$36\Omega$

23.

In a shaded pole single phase induction motor, which of these statements is true?

a)

There is only one winding on the stator

b)

The same current in armature windings is used to provide current in the shading bars

c)

a centrifugal switch is used to limit the current during startup

M3 Cat B bank

Total questions: 23

Worksheet time: 12mins

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