The U.S. Congress is expected to pass legislation this month lowering taxes and increasing spending for the year 2011. Fiscal stimulus is often thought to have a "multiplier" effect on aggregate demand, with $10 billion of additional stimulus leading to more than $10 billion of additional spending.

a. Explain why such a multiplier effect may occur.

b. Explain how each of these might affect the amount of output expansion resulting in the short run from each dollar of stimulus:

(1) Whether the stimulus is spending or tax reduction, and whose taxes are reduced

(2) How sensitive real interest rates are to additional government borrowing.

(3) How wages respond to increased employment.

Two ac sources feed a common variable resistive load as shown in the given figure. Under maximum power transfer condition, power absorbed by the load resistance RLis In the given circuit, S was initially open. At time t = 0, S is closed. When current through the inductor is 6A, then rate of change of current through the resistor is 6A/S. The value of inductor would be?

Question 3:

In a two-terminal network, open-circuit voltage mesured at the given terminals by an electronic vol t met er is 100 V. A short -circuit current measured at the same terminals by an ammeter of negligible resistance is 5 A. If a load resistor of 80 is connected at the same terminals, then current in the load resistor will be The value of the resistance R in the circuit shown in the given figure is varied in such a manner that the power dissipated in the 3 ohm resistor is maximum. Under this condition, the value of R will be?

Question 4:

A balanced star-connected load with impedance of 20 - 300 ohm is supplied from a 3-phase, 4-wire, 173 volts system, the voltages to neutral being 100 - 900, 100 - 300 and 100 - 1500 V. The current in the neutral wire is The v-i characteristics as seen from the terminal pair (A, B) of the network of Fig. (a) is shown in the Fig. (b). If an inductance of value 6 mH is connected across the terminal-pair (A, B), the time constant of the system will be?

Question 5:

Five cells are connected in series in a row and then four such rows are connected in parallel to feed the current to a resistive load of 1.25 . Each cell has emf of 1.5 V with internal resistance of 0.2 . The current through the load will be When two coupled coils of equal self-inductance are connected in series in one way the net inductance is 12 mH, and when they are connected in the other way, the net inductance is 4 mH. The maxiumum value of net inductance when they are connected in parallel in a suitable way is?

Question 6:

A resistance 'R' and inductance of 'L' H are connected across 240 V, Hz supply. Power dissipated in the circuit is 300 W and the voltage across R is 100 V. In order to improve the power fact or to unity, the capacitor that is to be connect ed in series should have a val ue ofThe energy stored in the magnetic field at a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current at 10 A, is?

Question 7:

A 35 V source is connected to a series circuit at 600 ohms and R If a voltmeter at internal resistance 1.2 kilo ohms is connected across 600 ohm resistor it reads 5 V. The value of R is When a voltage V0sin 0t is applied to the pure inductor, the ammeter shown in the figure reads I0. If the voltage applied is- V0sin 0t + 2 V0sin 20t + 3 V0sin 30t + 4 V0sin 40t

the ammeter reading would be?

Question 8:

The circuit was initially in the steady-state condition with the switch K closed. At the instant when the switch is opened, the rate of decay of current through the inductance will be In the series Rc circuit shown in the figure, the voltage across C starts increasing when the d.c. source is switched on. The rate of increase of voltage across C at the instant just after the switch is closed (i.e. at t = 0+) will be?

Question 9:

When the voltage E is 10 V, the current i is 1 A. If the applied voltage across terminal C-D is 100 V, the short circuit current flowing through the terminal A-B will be An ideal transformer has turns ratio of 2 : 1. Considering high voltage side as port 1 and low voltage side as port 2, then transmission line parameters of transformer will be?

Question 10:

In respect of the 2-port network, admittance parameters are: Y11= 8 mho, Y12= Y21= - 6 mho and Y22= 6 mho. The values of YA, YBand YC(in units of mho) will be respectively A certain network N feeds a load resistance R as shown in the Fig. (a) It consumes a power of P W. If an identical network is added as shown in Fig. (b) then power consumed by R will be?r