The line integral of the vector potential A around the boundary of a surface S represents

Consider a second order system whose state space representation is of the form

If , then system is

A Wien bridge oscillator is shown in figure. Which of the following statements are true, if f is the frequency of oscillation.        

A metal strain gauge has factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of, the value of change of resistance in response to the strain is

A CRO screen has ten divisions on the horizontal scale. If a voltage signal  is examined with a line base setting of 5msec/div, the number of cycles of signal displayed on the screen will be

When a line commutated converter operates in the inverter mode

Three devices A, B and C have to be connected to a 8085 microprocessor. Device A has highest priority and device C has the lowest priority. In this context which of the following is correct assignment of interrupt inputs?

The transfer function for the state variable representation , , is given by

s(t) is step response and h(t) is impulse response of a system. Its response y(t) for any input u(t) is given by

The transient stability of the power system can be effectively improved by

In load flow analysis, the load connected at a bus is represented as

A chopper operating at a fixed frequency is feeding an R-L load. As the duty ratio of the chopper is increased from 25% to 75%, the ripple in the load current

The thermal resistance between the body of a power semiconductor device and the ambient is expressed as

A three-phase slip ring induction motor is fed from the rotor side with stator winding short circuited. The frequency of the currents flowing in the short-circuited stator is

,  and  are the balanced instantaneous line to neutral voltages and ,  and  are instantaneous line currents in a balanced three phase circuit, the computation  will yield a quantity proportional to?

Signal flow graph is used to obtain the

The following circuit (figure) resonates at

A 10 bit A/D converter is used to digitize an analog signal in the 0 to 5V range. The maximum peak to peak ripple voltage that can be allowed in the D.C. supply voltage is

The distribution system shown in figure is to be protected by over current system of protection.

For proper fault discrimination directional over current relays will be required at locations

A three phase alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed a field current of  is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current

A 220/440 V, 50 Hz, 5 kVA single phase transformer operates on 220V, 40 Hz supply with secondary winding. Then        

A three-phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to ‘d’. If now the conductors of the line are rearranged to form an equilateral triangle of sides equal to ‘d’ then :

A synchronous motor operates at 0.8 p.f. lagging. If the field current of the motor is continuously increased

Two 550kVA alternators operate in parallel to supply the following loads

(i) 250 kW at 0.95 power factor lag

(ii) 100kW at 0.8 power factor lead

One machine is supplying 200kW at 0.9 pf lag. The power factor of other machine must be

A cumulative compounded long shunt motor is driving a load at rated torque and rated speed. If the series field in shunted by a resistance equal to the resistance of the series field, keeping the torque constant