One Stop GATE Forum: 1997- year EE GATE Paper

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1.  This  question  has  25  statements.  Each  statement  is  accompanied  by  four answers of which only  one is  correct. Indicate the  correct answer as A,  B, C and D on the first page of the answer book. Each statement carries one mark. 

1.1  An ideal voltage source will charge an ideal capacitor   
 (a)  in infinite time      (b)  exponentially 
 (c)  instantaneously      (d)  None of the above 

1.2  A practical current source is usually represented by 
  (a)  a resistance in series with an ideal current source 
 (b)  a resistance in parallel with an ideal current source 
 (c)  a resistance in parallel with an ideal voltage source 
 (d)  None of the above 

1.3  In a uniform electric field, field lines and equi-potentials   
 (a)  are parallel to one another   (b)  intersect at 45°  
 (c)  intersect at 30°      (d)  are orthogonal 

1.4  Energy stored in a capacitor over a cycle, when excited by an a.c. source is 
 (a)  the same as that due to a d.c. source of equivalent magnitude       
 (b)  half of that due to a d.c. source of equivalent magnitude 
 (c)  zero       
 (d)  none of the above 

1.5  A dynamometer type wattmeter responds to the 
 (a)  average value of active power  (b)  average value of reactive power 
 (c)  peak value of active power  (d)  peak value of reactive power 

1.6  A  transfer  instrument  employed  in  the  standardization  of  a  polar  type  a.c. 
potentiometer is 
  (a)  an electrostatic instrument  (b)  a thermal instrument  
 (c)  a dynamometer instrument  (d)  a moving instrument  

1.7  In a LVDT, the two secondary voltages 
 (a)  are independent of the core position    
 (b)  vary unequally depending on the core position   
 (c)  vary equally depending on the core position  
 (d)  are always in the phase quadrature 

1.8  The primary current in a current transformer is dictated by 
 (a)  the secondary burden   (b)  the core of the transformer 
 (c)  the load current      (d)  None of the above 

1.9  A major advantage of active filters is that they can be realized without using 
 (a)  op-amps  (b)  inductors  (c)  resistors  (d) capacitors 

1.10  If a diode is connected in anti-parallel with a thyristor, then 
 (a)  both turn-off power loss and turn-off time decrease   
 (b)  turn-off power loss decreases but turn-off time increase   
 (c)  turn-off power loss increases, but turn-off time decreases   
 (d)  None of the above 

1.11  In a dual converter, the circulating current 
 (a)  allows smooth reversal of load current, but increases the response time   
 (b)  does  not  allow  smooth  reversal  of  load  current,  but  reduces  the  response 
time   
  (c)  allows smooth reversal of load current with improved speed of response   
 (d)  flows only if there is not interconnecting inductor  

1.12  In a microprocessor, the address of the next instruction to be executed, is stored 
in  
  (a)  stack pointer      (b)  address latch 
 (c)  program counter      (d)  general purpose register 

1.13  The  computer program which converts statements written in high level language 
to object code is known as: 
  (a)  assembler      (b)  operating system   
 (c)  object-oriented software  (d)  None of the above 

1.14  A differentiator has transfer function whose  
 (a)  phase increases linearly with frequency    
 (b)  amplitude remains constant   
 (c)  amplitude increases linearly with frequency   
 (d)  amplitude decreases linearly with frequency  

1.15  Introduction  of  integral  action  in  the  forward  path  of  a  unity  feedback  system 
results in a   
  (a)  marginally stable system   
 (b)  system with no steady state error   
  (c)  system with increased stability margin   
 (d)  system with better speed of response 

1.16  A square matrix is called singular if its 
 (a)  determinant is unity    (b)  determinant is zero   
 (c)  determinant is infinity 
 (d)  rank is unity 

1.17  Gauss-Seidel iterative method can be used for solving a set of 
 (a)  linear differential equations only   
 (b)  linear algebraic equations only   
 (c)  both linear and nonlinear algebraic equations   
 (d)  both linear and nonlinear differential equations 

1.18  If an induction machine is run at above synchronous speed, it acts as 
 (a)  a synchronous motor    (b)  an induction generator 
 (c)  an inductor motor    (d)  None of the above 

1.19.  The  low  voltage  winding  of  a  400/230V,  1-phase,  50  Hz  transformer  is  to  be 
connected to a 25 Hz supply at 25 Hz, the supply voltage should be 
  (a)  230 V  (b)  460 V  (c)  115 V  (d) 65 V 

1.20.  A voltage v = 400 sin 314.16 t is applied to a 1-phase transformer on no-load. If 
the no load current of the transformer is 2 sin(314 16t œ 85°), the magnetization 
branch impedance will be approximately equal to 
  (a)  141 90°   (b)  200 85
- °   (c)  200 85°   (d) 282  80
- °  

1.21.  For  a  fault  at  the  terminals  of  a  synchronous  generator,  the  fault  current  is 
maximum for a  
  (a)  3-phase fault      (b)  3-phase to ground fault 
 (c)  line-to-ground fault    (d)  line-to-line fault 

1.22.  Reactance relay is normally preferred for protection against   
 (a)  earth faults      (b)  phase faults 
 (c)  open-circuit faults    (d)  None of the above 

1.23.  A 100 MVA, 11 kV,  3-phase, 50 Hz, 8-pole  synchronous generator  has an inertia 
constant H equal to 4 seconds. The stored energy in the rotor of the generator at 
E
synchronous speed will be H =  .
G  
  (a)  100 MJ  (b)  400 MJ  (c)  800 MJ  (d) 12.5 MJ 

1.24.  The use of high-speed circuit-breakers 
 (a)  reduce the short circuit current  (b)  improves system stability 
 (c)  decreases system stability 
 (d)  increases the short circuit current  

1.25  Bundled conductors are employed to improve the 
 (a)  appearance of the transmission line  (b)  mechanical stability of the line 
 (c)  decreases system stability    
 (d)  increases the short circuit current 

Author	Message
Arpita Groupie Joined: 04Jan2007 Online Status: Offline Posts: 73	Topic: 1997- year EE GATE Paper Posted: 14Feb2007 at 9:50am
	1. This question has 25 statements. Each statement is accompanied by four answers of which only one is correct. Indicate the correct answer as A, B, C and D on the first page of the answer book. Each statement carries one mark. 1.1 An ideal voltage source will charge an ideal capacitor (a) in infinite time (b) exponentially (c) instantaneously (d) None of the above 1.2 A practical current source is usually represented by (a) a resistance in series with an ideal current source (b) a resistance in parallel with an ideal current source (c) a resistance in parallel with an ideal voltage source (d) None of the above 1.3 In a uniform electric field, field lines and equi-potentials (a) are parallel to one another (b) intersect at 45° (c) intersect at 30° (d) are orthogonal 1.4 Energy stored in a capacitor over a cycle, when excited by an a.c. source is (a) the same as that due to a d.c. source of equivalent magnitude (b) half of that due to a d.c. source of equivalent magnitude (c) zero (d) none of the above 1.5 A dynamometer type wattmeter responds to the (a) average value of active power (b) average value of reactive power (c) peak value of active power (d) peak value of reactive power 1.6 A transfer instrument employed in the standardization of a polar type a.c. potentiometer is (a) an electrostatic instrument (b) a thermal instrument (c) a dynamometer instrument (d) a moving instrument 1.7 In a LVDT, the two secondary voltages (a) are independent of the core position (b) vary unequally depending on the core position (c) vary equally depending on the core position (d) are always in the phase quadrature 1.8 The primary current in a current transformer is dictated by (a) the secondary burden (b) the core of the transformer (c) the load current (d) None of the above 1.9 A major advantage of active filters is that they can be realized without using (a) op-amps (b) inductors (c) resistors (d) capacitors 1.10 If a diode is connected in anti-parallel with a thyristor, then (a) both turn-off power loss and turn-off time decrease (b) turn-off power loss decreases but turn-off time increase (c) turn-off power loss increases, but turn-off time decreases (d) None of the above 1.11 In a dual converter, the circulating current (a) allows smooth reversal of load current, but increases the response time (b) does not allow smooth reversal of load current, but reduces the response time (c) allows smooth reversal of load current with improved speed of response (d) flows only if there is not interconnecting inductor 1.12 In a microprocessor, the address of the next instruction to be executed, is stored in (a) stack pointer (b) address latch (c) program counter (d) general purpose register 1.13 The computer program which converts statements written in high level language to object code is known as: (a) assembler (b) operating system (c) object-oriented software (d) None of the above 1.14 A differentiator has transfer function whose (a) phase increases linearly with frequency (b) amplitude remains constant (c) amplitude increases linearly with frequency (d) amplitude decreases linearly with frequency 1.15 Introduction of integral action in the forward path of a unity feedback system results in a (a) marginally stable system (b) system with no steady state error (c) system with increased stability margin (d) system with better speed of response 1.16 A square matrix is called singular if its (a) determinant is unity (b) determinant is zero (c) determinant is infinity (d) rank is unity 1.17 Gauss-Seidel iterative method can be used for solving a set of (a) linear differential equations only (b) linear algebraic equations only (c) both linear and nonlinear algebraic equations (d) both linear and nonlinear differential equations 1.18 If an induction machine is run at above synchronous speed, it acts as (a) a synchronous motor (b) an induction generator (c) an inductor motor (d) None of the above 1.19. The low voltage winding of a 400/230V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz supply at 25 Hz, the supply voltage should be (a) 230 V (b) 460 V (c) 115 V (d) 65 V 1.20. A voltage v = 400 sin 314.16 t is applied to a 1-phase transformer on no-load. If the no load current of the transformer is 2 sin(314 16t œ 85°), the magnetization branch impedance will be approximately equal to (a) 141 90° (b) 200 85 - ° (c) 200 85° (d) 282 80 - ° 1.21. For a fault at the terminals of a synchronous generator, the fault current is maximum for a (a) 3-phase fault (b) 3-phase to ground fault (c) line-to-ground fault (d) line-to-line fault 1.22. Reactance relay is normally preferred for protection against (a) earth faults (b) phase faults (c) open-circuit faults (d) None of the above 1.23. A 100 MVA, 11 kV, 3-phase, 50 Hz, 8-pole synchronous generator has an inertia constant H equal to 4 seconds. The stored energy in the rotor of the generator at E synchronous speed will be H = . G (a) 100 MJ (b) 400 MJ (c) 800 MJ (d) 12.5 MJ 1.24. The use of high-speed circuit-breakers (a) reduce the short circuit current (b) improves system stability (c) decreases system stability (d) increases the short circuit current 1.25 Bundled conductors are employed to improve the (a) appearance of the transmission line (b) mechanical stability of the line (c) decreases system stability (d) increases the short circuit current
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