The pressure coil of a dynamometer type wattmeter is

•  (A) highly inductive
•  (B) highly resistive
•  (C) purely resistive
•  (D) purely inductive

The measurement system shown in the figure uses three sub-systems in cascade whose gains are specified as G₁,G₂ and $\frac{1}{G_3}$. 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:

•  (A) ${\epsilon }_1+{\epsilon }_2+\frac{1}{{\epsilon }_3}$
•  (B) $\frac{{\epsilon }_1·{\epsilon }_2}{{\epsilon }_3}$
•  (C) ${\epsilon }_1+{\epsilon }_2-{\epsilon }_3$
•  (D) ${\epsilon }_1+{\epsilon }_2+{\epsilon }_3$

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

•  (A) 
•  (B) 
•  (C) 
•  (D) 

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.

•  (A) The signals are not sinusoidal
•  (B) The amplitudes of the signals are very close but not equal
•  (C) The signals are sinusoidal with their frequencies very close but not equal
•  (D) There is a constant but small phase difference between the signals

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

•  (A) (v), (ii), (iii), (iv), (i)
•  (B) (v), (ii), (iii), (i), (iv)
•  (C) (ii), (i), (iii), (iv), (v)
•  (D) (v), (ii), (i), (iii), (iv)

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

•  (A) 1 V
•  (B) 10 V
•  (C) 100 V
•  (D) 1000 V

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

•  (A) 0 mA
•  (B) 1 mA
•  (C) 2 mA
•  (D) 6 mA

Out of the following plant categories

The base load power plants are

•  (A) (i) and (ii)
•  (B) (ii) and (iii)
•  (C) (i), (ii) and (iv)
•  (D) (i), (iii) and (iv)

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

•  (A) V
•  (B) V²
•  (C) 1/V²
•  (D) 1/V

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

•  (A) not possible
•  (B) 4
•  (C) 3
•  (D) 2

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-$\tau$) is applied to a system with impulse response h(t-$\tau$), the output will be

•  (A) y(t)
•  (B) y(2(t-$\tau$))
•  (C) y(t-$\tau$)
•  (D) y(t-2$\tau$)

The nature of feedback in the opamp circuit shown is

•  (A) Current - Current feedback
•  (B) Voltage - Voltage feedback
•  (C) Current - Voltage feedback
•  (D) Voltage - Current feedback

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

•  (A) NOT, OR and AND Gates
•  (B) XNOR, NOR and NAND Gate
•  (C) NOR and NAND Gates
•  (D) XOR, NOR and NAND Gates

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) double
•  (B) remain same
•  (C) be halved
•  (D) become one quarter

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?

•  (A) A is stable B is unstable
•  (B) A is unstable B is stable
•  (C) Both are stable
•  (D) Both are unstable

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

•  (A) it can be turned OFF but not ON with a gate pulse
•  (B) it conducts only during one half-cycle of an alternating current wave
•  (C) it can be turned ON but not OFF with a gate pulse
•  (D) it can be turned ON only during one half-cycle of an alternating voltage wave

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

•  (A) Always stable
•  (B) Marginally stable
•  (C) Unstable with one pole on the RH s-plane
•  (D) Unstable with two poles on the RH s-plane

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

$\begin{array}{ccc}{\mathrm{s}}^3& 2& 2\\ {\mathrm{s}}^2& 4& 4\end{array}$

This means there are

•  (A) two roots at s ± j and one root in right half s-plane
•  (B) two roots at s ± j2 and one root in left half s-plane
•  (C) two roots at s ± j2 and one root in right half s-plane
•  (D) two roots at s ± j  and one root in left half s-plane

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

•  (A) $\frac{10\left(s+5\right)}{s\left(s+2\right)\left(s+25\right)}$
•  (B) $\frac{100\left(s+5\right)}{s^2\left(s+2\right)\left(s+25\right)}$
•  (C) $\frac{100\left(s+5\right)}{s\left(s+2\right)\left(s+25\right)}$
•  (D) $\frac{80\left(s+5\right)}{s^2\left(s+2\right)\left(s+25\right)}$

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

•  (A) -30 and -5
•  (B) -37 and -1
•  (C) -7 and 5
•  (D) 17.5 and -2