Electrical Engineering Gate Yearwise 




Electrical Engineering GATE 2014 Set-3 Questions with Answer

Ques 1 Analog Electronics

An operational-amplifier circuit is shown in the figure.

The output of the circuit for a given input vi is

A

-(R2/R1)vi

B

-(1+R2/R1)vi

C

(1+R2/R1)vi

D

+Vsat or -Vsat



Ques 2 Control Systems

The signal flow graph of a system is shown below. U(s) is the input and C(s) is the output.

Assuming, h1=b1 and h0=b0-b1a1. the input-output transfer function, G(s)=C(s)/U(s) of the system is given by

A

G(s)=(b0s+b1)/(s2+a0s+a1)

B

G(s)=(a1s+a0)/(s2+b1s+b0)

C

G(s)=(b1s+b0)/(s2+a1s+a0)

D

G(s)=(a0s+a1)/(s2+b0s+b1)



Ques 3 Control Systems

A single-input single-output feedback system has forward transfer function G(s) and feedback transfer function H(s). It is given that |G(s)H(s)|<1. Which of the following is true about the stability of the system?

A

The system is always stable

B

The system is stable if all zeros of G(s)H(s) are in left half of the s-plane

C

The system is stable if all poles of G(s)H(s) are in left half of the s-plane

D

It is not possible to say whether or not the system is stable from the information given



Ques 4 Digital Electronics

A state diagram of a logic gate which exhibits a delay in the output is shown in the figure, where X is the don't care condition, and Q is the output representing the state.

The logic gate represented by the state diagram is

A

XOR

B

OR

C

AND

D

NAND



Ques 5 Electric Circuits

The line A to neutral voltage is 10∠15°V for a balanced three phase star-connected load with phase sequence ABC. The voltage of line B with respect to line C is given by

A

10√3∠105°V

B

10∠105°V

C

10√3∠-75°V

D

-10√3∠90°V



Ques 6 Electric Circuits

The driving point impedance Z(s) for the circuit shown below is

A

(s4+3s2+1)/(s3+2s)

B

(s3+2s)/(s4+3s2+1)

C

(s2+1)/(s4+s2+1)

D

(s3+1)/(s4+s2+1)



Ques 7 Electric Circuits

A non-ideal voltage source VS has an internal impedance of ZS. If a purely resistive load is to be chosen that maximizes the power transferred to the load, its value must be

A

0

B

real part of Zs

C

magnitude of Zs

D

complex conjugate of Zs



Ques 8 Electric Circuits

The Norton's equivalent source in amperes as seen into the terminals X and Y is ________.


2 is the correct answer.


Ques 9 Electric Circuits

The power supplied by the 2A current source, in the figure, is ________ W.


3 is the correct answer.


Ques 10 Electric Circuits

A series RLC circuit is observed at two frequencies. At ω1=1 krad/s, we note that source voltage V1=100∠0° V results in a current I1=0.03∠31° A. At ω2=2 krad/s, the source voltage V2=100∠0° V results in a current I2=2∠0° A. The closest values for R, L, C out of the following options are

A

R=50 Ω; L=25 mH; C=10 µF;

B

R=50 Ω; L=10 mH; C=25 µF;

C

R=50 Ω; L=50 mH; C=5 µF;

D

R=50 Ω; L=5 mH; C=50 µF;



Ques 11 Electrical Machines

In a synchronous machine, hunting is predominantly damped by

A

mechanical losses in the rotor

B

iron losses in the rotor

C

copper losses in the stator

D

copper losses in the rotor



Ques 12 Electrical Machines

A single phase induction motor is provided with capacitor and centrifugal switch in series with auxiliary winding. The switch is expected to operate at a speed of 0.7 Ns, but due to malfunctioning the switch fails to operate. The torque-speed characteristic of the motor is represented by

A

B

C

D



Ques 13 Electrical Machines

The no-load speed of a 230 V separately excited dc motor is 1400 rpm. The armature resistance drop and the brush drop are neglected. The field current is kept constant at rated value. The torque of the motor in Nm for an armature current of 8 A is ________.


12.45 to 12.65 is the correct answer.


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