Electrical Engineering - GATE 2009 Paper Solution


The pressure coil of a dynamometer type wattmeter is

The measurement system shown in the figure uses three sub-systems in cascade whose gains are specified as G1,G2 and 1G3. The relative small errors associated with each respective subsystem G1,G2 and G3 are ε1,ε2 and ε3. The error associated with the output is:

The following circuit has a source voltage Vs as shown in the graph. The current through the circuit is also shown.

The two inputs of a CRO are fed with two stationary periodic signals. In the X-Y mode, the screen shows a figure which changes from ellipse to circle and back to ellipse with its major axis changing orientation slowly and repeatedly. The following inference can be made from this.

The increasing order of speed of data access for the following devices is

(i) Cache Memory (ii) CDROM (iii) Dynamic RAM (iv) Processor Registers (v) Magnetic Tape

A field excitation of 20 A in a certain alternator results in an armature current of 400A in short circuit and a terminal voltage of 2000V on open circuit. The magnitude of the internal voltage drop within the machine at a load current of 200A is

The current through the 2 kΩ resistance in the circuit shown is

Out of the following plant categories

(i) Nuclear (ii) Run-of-river (iii) Pump Storage (iv) Diesel

The base load power plants are

For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to

How many 200W/220V incandescent lamps connected in series would consume the same total power as a single 100W/220V incandescent lamp?

A Linear Time Invariant system with an impulse response h(t) produces output y(t) when input x(t) is applied. When the input x(t-τ) is applied to a system with impulse response h(t-τ), the output will be

The nature of feedback in the opamp circuit shown is

The complete set of only those Logic Gates designated as Universal Gates is

The single phase, 50Hz, iron core transformer in the circuit has both the vertical arms of cross sectional area 20cm2 and both the horizontal arms of cross sectional area 10cm2. If the two windings shown were wound instead on opposite horizontal arms, the mutual inductance will

A 3-phase squirrel cage induction motor supplied from a balanced 3-phase source drives a mechanical  load. The torque-speed characteristics of the motor (solid curve) and of the load (dotted curve) are shown. Of the two equilibrium points A and B, which of the following options correctly describes the stability of A and B?

An SCR is considered to be a semi-controlled device because

The polar plot of an open loop stable system is shown below. The closed loop system is

The first two rows of Routh's tabulation of a third order equation are as follows.


This means there are

The asymptotic approximation of the log-magnitude vs frequency plot of a system containing only real poles and zeros is shown. Its transfer function is

The trace and determinant of a 2 × 2 matrix are known to be -2 and -35 respectively. Its eigen values are