Free Printable M3.14 Cat B

1.

Select the correct phrase:

a)

In a capacitive circuit the voltage leads the current.

b)

In an inductive circuit the current lags the voltage.

c)

In a resistive circuit, the current and voltage are out of phase.

d)

In a capacitive circuit the current lags the voltage.

2.

Select the correct sentence:

a)

Active power can only be developed in a pure inductance.

b)

Reactive power is developed in a capacitor.

c)

Apparent power increases as the power factor increases.

d)

Power factor is apparent power divided by active power.

3.

Select the correct combination of quantity (equation) symbol and unit:

a)

W, Watt

b)

P, VAr

c)

X, Ohm

d)

Q, Watt

4.

In a sinusoidal AC circuit containing an inductance and a resistance in series:

a)

the sum of the voltages across both components, as measured by a multimeter, adds up to the supply voltage.

b)

the voltage across both components are out of phase by 90 degrees.

c)

the current through each component is different.

d)

the inductance is proportional to the supply frequency.

5.

Complete the sentence:

In a parallel circuit containing a capacitor and resistor connected to a sinusoidal supply:

a)

the voltage across each component is the same.

b)

the current in each component is the same.

c)

the current in the capacitor lags the applied voltage by 90 degrees.

d)

the total current drawn goes down as the frequency goes up.

6.

Choose the ones with the correct unit

a)

P [W]

b)

S [VA]

c)

S [VAR]

d)

P [kW]

7.

Calculation involving power must use _______ value of voltage and current

a)

corresponding

b)

supply

c)

root mean square (rms)

d)

total

8.

Formula for inductive capacitance is...

a)

$\frac{1}{2\pi fC}$

b)

$\frac{1}{2\pi fL}$

c)

It does not exist

d)

$2\pi fC$

9.

The formula to find X_Cis

a)

$\frac{1}{2\pi fC}$

b)

$2\pi fC$

c)

$\frac{1}{2}\pi fC$

d)

$\omega fC$

10.

The unit of capacitor is:

(a)

11.

This picture showing the voltage and current signals are:

a)

Out of phase

b)

In Phase

c)

out of network

d)

Non of these

12.

Which Component will cause the phase shift showing in this picture ??? (V lags I)

a)

Capacitor

b)

Inductor

c)

Resistor

d)

Diode

13.

This picture is showing:

a)

Ceramic Capacitor

b)

Transistor

c)

Electrolytic Capacitor

d)

SCR

14.

A capacitor is an electronic component which consists of __________.

a)

a pair of insulating plates separated by conducting materials

b)

a pair of insulating plates separated by dielectric

c)

a pair of conducting plates separated by dielectric

15.

In an inductive circuit, the current will _______ the voltage

a)

lead

b)

lag

c)

be in-phase with

16.

This phasor diagram for:

a)

R

b)

L

c)

C

d)

X

17.

In a series circuit current must be

a)

constant for each element

b)

cosine graph in all 3 components

c)

different for each element

18.

Write an equation that solves for the impedance, $Z_{total}$ , of this series circuit.

a)

$Z_{total}=\sqrt{R^2+X^2}$

b)

$Z_{total}=\sqrt{R^2-X^2}$

c)

$Z_{total_{ }}=R^2+X^2$

d)

$Z_{total}=R^2-X^2$

19.

Calculate the total impedance if C=50nF and R=2000 Ohm.

a)

106200 Ohm

b)

5175 Ohm

c)

3250 Ohm

d)

21000 Ohm

20.

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

a)

V_p-p

b)

V_p

c)

V_mean

d)

V_rms

21.

If the frequency of the ac supply is increased what would happen to the value of the inductive reactance (X_L) within a series LR circuit

a)

X_L would increase

b)

X_L would decrease

c)

X_L would remain the same

22.

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

a)

I_s

b)

V_s

c)

P

d)

V_L

e)

I_c

23.

In the phasor diagram shown what is being represented by a.

a)

V_C

b)

V_L

c)

I_L

d)

Z

e)

I_C

24.

Which formula below would you use to calculate Z from the diagram shown?

a)

$Z=\frac{\cos\theta}{R}$

b)

$Z=R\cos\theta$

c)

$Z=\frac{R}{\cos\theta}$

d)

$Z=X_L\tan\theta$

e)

$Z=\frac{X_L}{\tan\theta}$

25.

If $X_C>X_L$ then Voltage would lead Current in the circuit.

True or False

a)

True

b)

False

26.

If $X_C<X_L$ then Voltage would lead Current in the circuit.

True or False

a)

True

b)

False

M3.14 Cat B

Total questions: 26

Worksheet time: 18mins

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