3. Other therapeutic approaches for depression
3.1. Transdiagnostic perspective
1. Link In network theory refers to A. B-N+1.
B. B-N-1.
C. N-1.
D. N-B-1.
B = BRANCH, N = NODES, TWIG = N-1.
LINK L = B-(N-1) = B-N+1.
LINK / CHORD : is the branch of a graph that doesnot belong to the particular tree. It is simply called a link.
2. The voltage across R and L in a series PL circuit are found to be 200 v and 150 v respectively the rms value of the voltage across the series combination is ___V.
. 360.
A. 250.
B. 200.
C. 450.
V = √ V2R X V2L = √ 2002 + 150 2 = 250 V.
3. Whenever current is supplied by a source its terminal voltage . increases.
A. decreases.
B. remains constant.
C. increases exponentially.
Whenever current is supplied by a source, this current also flows through the internal resistance connected in series in the source. Because of voltage drop across the internal resistance, the terminal voltage is decreased.
4. A current of 4 A flows in an ac circuit when 100 v dc is applied to it whereas it takes 250 v ac to produce the same current the power factor of the circuit is
. 0.4.
A. 10.
B. 1.
C. 0.85.
With dc R = V / I = 100 / 4 = 25 ohms
With ac Z = V / I = 250 / 4 = 62.5 ohms.
Cos Φ = R / Z = 25 / 62.5 = 0.4
5. Which of the following cannot be connected in series unless they are identical . voltage source.
A. Current source.
B. both.
C. resistance.
Current source cannot be connected in series unless identical because in series all individual current sources have same values.
6. A reactance having an inductance of 0.15 H is connected in series with 10 ohm resistance.What will be the inductive reactance
. 48.15 ohm.
A. 47.1 ohm.
B. 1.5 ohm.
C. none of these.
Inductive reactance XL = 2 Π f L = 2 X 3.14 X 50 X 0.15 = 47.1 Ω
7. Kirchhoff's second law is based on law of conservation of . charge.
A. energy.
B. momentum.
C. mass.
Kirchhoff's voltage law (KVL) is also called Kirchhoff's second law. The principle of conservation of energy implies that the directed sum of the electrical potential differences (voltage) around any closed network is zero.
8. A series circuit consists of R = 20Ω, L = 20 mH, and ac supply 60V with f = 100 Hz. The current in R is . 2.54 A.
A. 1.27 A.
B. 5.08 A.
C. 10.16 A.
The expression for impedance of series R - L circuit is Z = (R2 + 4.π2.f2.L2)½
Here, R = 20Ω, L = 20 mH, V = 60V and f = 100 Hz
Z = [202 + 4 X 3.142X 100 2X (20 X 10 - 3)2]½ = 23.61 Ω Therefore, current through the circuit i.e both through resistor and inductor will be 60/23.61 = 2.54 A.
9. A series circuit consists of R = 20Ω, L = 20 mH, and ac supply 60V with f = 100 Hz. The voltage drop across R is
. 30.6 V. Therefore, current through the circuit i.e both through resistor and inductor will be 60/23.61 = 2.54 A The voltage drop across R is V = IR = 2.54 X 20 V = 50.8 V. current in respect of supply voltage will be
. 40.4°.
The reactance of the circuit, X = 2.π.f.L = 2 X 3.14 X 100 X 20 X 10 - 3 = 12.56 Ω
∴ the phase angle of current in respect of supply voltage will be θ = sin - 1(X/Z) = sin - 1(12.56 / 23.61) = 32.1°.
12. If a resistor and an inductor are connected in series across a voltage source. Which two parameters in that circuit increase if frequency of voltage source increases?
. VL & Z.
A. Z & I.
B. VL & I.
C. VL & VR.
If frequency of the voltage source increases, the reactance of the inductor increases as because XL = 2π.f.L and if XL and that causes increase in the total impedance Z, of the circuit, which results decreasing the current I through the circuit. If current is reduced, the voltage drop across the resistor VR is decreased.
Again voltage drop across the inductor is the difference of supply voltage and voltage drop across the resistor, hence voltage across inductor VL will increase.
13. If a resistor and an inductor are connected in series across a voltage source. Which two parameters in that circuit decrease if frequency of voltage source increases?
. VL & Z.
A. VR & I.
B. Z & I.
C. VL & VR.
If frequency of the voltage source increases, the reactance of the inductor increases as because XL = 2π.f.L and if XL and that causes increase in the total impedance Z, of the circuit, which results decreasing the current I through the circuit. If current is reduced, the voltage drop across the resistor VR is decreased.
Again voltage drop across the inductor is the difference of supply voltage and voltage drop across the resistor, hence voltage across inductor VL will increase.
14. If a resistor and a capacitor are connected to form series R - C circuit across a voltage source. If frequency of voltage source increases
. the current increases.
A. the current decreases.
B. the current remain unaltered.
C. the current decreases abruptly.
In series RC circuit if supply frequency is increased, the current increases. Because the impedance of capacitor is ...That is capacitive impedance is inversely proportional to frequency. As capacitive impedance decreases with increase in frequency, the overall impedance of the series RC circuit is decreased which results increase in current through the circuit.
15. A branch of a network is said to be active when it consists of one . resistor.
A. voltage source.
B. inductor.
C. capacitor.
When a branch of a network contains one or more sources it is called an active branch.
16. A branch of a network is said to be passive when it contains . voltmeter.
A. voltage source.
B. current source.
C. battery.
A branch that does not contain any source is known as a passive branch. Voltmeter is not a source.
17. Which of the following is not a bilateral?
. resistor.
A. diode.
B. capacitor.
C. inductor.
A bilateral element conduct equally well in either directions. Such as resistor & inductor . When the current voltage relation are different for the two directions of current flow, the element is said to be unilateral Diode is a unilateral element.
18. Which of the following characteristics is attributed to an ideal independent voltage source?
. independent of magnitude of current supplied.
A. dependent of the magnitude of current supplied.
B. dependent of the direction of flow of current.
C. none of above.
In independent ideal voltage source is such a source, which gives fixed voltage, irrespective of magnitude and direction of current flowing through it.
19. Dependent source of current and voltage are those which have, . unidirectional characteristic.
A. output dependent on input.
B. independent of any other network variable.
C. all above.
The source whose output voltage or current is a function of the voltage or current in another part of the circuit is called dependent source.
20. The internal resistance of a practical voltage source is considered to be connected in . series.
A. parallel.
B. either parallel or series.
C. none of the above.
Whenever load is connected to the voltage source, its terminal voltage decreases become of its internal resistance. Hence the internal resistance of a practical voltage source is assumed to be connected in series with the source.