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Worksheets

ECA 1

Total questions: 10

Worksheet time: 5mins

Name
Class
Date
1.

The reciprocal of resistance is:

a)

Coloumbs

b)

Henry

c)

Conducatance

d)

Impedance

2.

The current Io in Fig. below is:

a)

4A

b)

3A

c)

2A

d)

1A

3.

In a Y-Y system, a line voltage of 220 V produces a phase voltage of

a)

127

b)

156

c)

311

d)

381

4.

In a Delta - Delta system, a phase voltage of 100 V produces a line voltage of:

a)

71

b)

58

c)

100

d)

141

5.

The instrument for measuring average power is the:

a)

Voltmeter

b)

Wattmeter

c)

Ammeter

d)

Varmeter

6.

In the power triangle shown in Fig., the reactive power is:

a)

1000 VAR Leading

b)

866 VAR Leading

c)

1000 VAR Lagging

d)

866 VAR Lagging

7.

A parallel RLC circuit has L = 2 H and C = 0.25 F. The value of R that will produce unity damping factor is ___ Ohm

a)

0.5

b)

1

c)

2

d)

4

8.

In the circuit of Fig., v(∞) is:

a)

10V

b)

6V

c)

0V

d)

5V

9.

The time constant for an RL circuit with R = 2 Ohms and L = 4 H is:

a)

0.5S

b)

2S

c)

4S

d)

6S

10.

If the current through a 10-mH inductor increases from zero to 2 A, how much energy is stored in the inductor?

a)

40mJ

b)

20mJ

c)

10mJ

d)

60mJ