One Stop GATE Forum: 2001- year EE GATE Paper

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1.  In  a  series  RLC  circuit  at  resonance,  the  magnitude  of  the  voltage  developed 
across the capacitor   
  (a)  is always zero 
 (b)  can never be greater than the input voltage 
 (c)  can  be  greater  than  the  input voltage, however,  it  is 90°  out  of phase  with 
the input voltage 
  (d)  can be greater than the input voltage, and is in phase with the input voltage. 

2.  Two  incandescent  light  bulbs  of  40  W  and  60  W  rating  are  connected  in  series 
across the mains. Then 
  (a)  the bulbs together consume 100 W 
 (b)  the bulbs together consume 50W 
 (c)  the 60 W bulb glows brighter 
 (d)  the 40 W bulb glows brighter 

3.  A  unit  step  voltage  is  applied  at  t  =  0  to  a  series  RL  circuit  with  zero  initial 
conditions.   
  (a)  It is possible for the current to be oscillatory.   
 (b)  The voltage across the resistor at t = 0+  is zero.   
 (c)  The energy stored in the inductor in the steady state is zero.   
 (d)  The resistor current eventually falls to zero. 

 4.  A passive  2-port  network  is in  a steady-state. Compared to its  input, the steady 
state output can never offer 
  (a)  higher voltage      (b)  lower impedance 
 (c)  greater power      (d)  better regulation 

5.  A  single-phase  transformer  is  to  be  switched  to  the  supply  to  have  minimum inrush current. The switch should be closed at 
  (a)  maximum supply voltage  (b)  zero supply voltage 
  (c)  1                                       (d)  0

6.  It  is  desirable  to  eliminate  5th  harmonic  voltage  from  the  phase  voltage  of  an 
alternator. The coils should be short-pitched by an electrical angle of  
  (a)  30°  (b)  36°  (c)  72°  (d) 18° 

7.  The core flux of a practical transformer with a resistive load 
 (a)  is strictly constant with load changes   
 (b)  increases linearly with load   
 (c)  increases as the square root of the load  
 (d)  decreases with increased load 

8.  A  50  Hz  balanced  three-phase,  Y-connected  supply  is  connected  to  a  balanced 
three phase Y-connected load. If the instantaneous phase-a of the supply voltage 
is  Vcos( t)  and  the  phase-a  of  the  load  current  is  Icos( t-f),  the  instantaneous 
three-phase power is 
  (a)  a constant with a magnitude of VIcosf   
  (b)  a constant with a magnitude of (3/2)VIcosf  
  (c)  time-varying  with  an  average  value of  (3/2)  VIcosf  and  a  frequency  of  100 Hz.   
  (d)  time-varying with an average value of VIcosf and a frequency of 50 Hz. 

9.   In the protection of transformers, harmonic restraint is used to guard aainst  
 (a)  magnetizing inrush current  (b)  unbalanced operation 
 (c)  lightning      (d)  switching over-voltages 

10.  A lossless radial transmission line with surge impedance loading 
 (a)  takes negative VAR at sending end and zero VAR at receiving end   
 (b)  takes positive VAR at sending end and zero VAR at receiving end   
 (c)  has flat voltage profile and unity power factor at all points along it  
 (d)  has  sending  end  voltage higher  than  receiving  end  voltage and  unity  power 
factor at sending end 

11.  If an energy meter disc makes 10 revolutions in 100 seconds when a load of 450 
W is connected to it, the meter constant (in rev/kWh) is 
  (a)  1000  (b)  500  (c)  1600  (d) 800 
1.17  The  minimum  number  of  wattmeter  (s)  required  to  measure  3-phase,  3-wire 
balanced or unbalanced power is 
  (a)  1  (b)  2  (c)  3  (d) 4 

12.  Among the following four, the slowest ADC (analog-to-digital converter) is 
 (a)  parallel comparator (i.e., flash) type   
 (b)  successive approximation type   
 (c)  integrating type      (d)  counting type 

13.  The  output of a  logic gate is —1“ when  all  its inputs  are at  logic —0“.  The gate is 

  (a)  a NAND or an EX-OR gate  (b)  a NOR or an EX-OR gate 
 (c)  an AND or an EX-NOR gate  (d)  a NOR or an EX-NOR gate 

 14.  An op-amp has an open-loop gain of 105 and an open-loop upper cutoff frequency 
of  10  Hz.  If  this  op-amp  is  connected as  an  amplifier with a  closed-loop gain  of 
100, then the new upper cutoff frequency is  
  (a)  10 Hz  (b)  100 Hz  (c)  10 kHz  (d) 100 kHz 

15.  The  main  reason  for  connecting  a  pulse  transformer  at  the  output  stage  of  a  
thyristor triggering circuit is to 
  (a)  amplifying the power of the triggering pulse  
 (b)  provide electrical isolation   
 (c)  reduce the turn on time of the thyristor  
 (d)  avoid spurious triggering of the thyristor due to noise 

16.  AC-to-DC  circulating  current  dual  converters  are  operated  with  the  following 
relationship between their triggering angles (a1 and a2). 
  (a)  a1 + a2 = 180°      (b)  a1 + a2 = 360° 
 (c)  a1 - a2 = 180°      (d)  a1 + a2 = 90° 

17.  In  case  of an armature  controlled  separately excited dc motor drive with closed-
loop speed control, an inner current loop is useful because it 
  (a)  limits the speed of the motor to a safe value       
 (b)  helps in improving the drive energy efficiency  
 (c)  limits the peak current of the motor to the permissible value       
 (d)  reduces the steady state speed error 

Author	Message
Arpita Groupie Joined: 04Jan2007 Online Status: Offline Posts: 73	Topic: 2001- year EE GATE Paper Posted: 14Feb2007 at 10:52am
	1. In a series RLC circuit at resonance, the magnitude of the voltage developed across the capacitor (a) is always zero (b) can never be greater than the input voltage (c) can be greater than the input voltage, however, it is 90° out of phase with the input voltage (d) can be greater than the input voltage, and is in phase with the input voltage. 2. Two incandescent light bulbs of 40 W and 60 W rating are connected in series across the mains. Then (a) the bulbs together consume 100 W (b) the bulbs together consume 50W (c) the 60 W bulb glows brighter (d) the 40 W bulb glows brighter 3. A unit step voltage is applied at t = 0 to a series RL circuit with zero initial conditions. (a) It is possible for the current to be oscillatory. (b) The voltage across the resistor at t = 0+ is zero. (c) The energy stored in the inductor in the steady state is zero. (d) The resistor current eventually falls to zero. 4. A passive 2-port network is in a steady-state. Compared to its input, the steady state output can never offer (a) higher voltage (b) lower impedance (c) greater power (d) better regulation 5. A single-phase transformer is to be switched to the supply to have minimum inrush current. The switch should be closed at (a) maximum supply voltage (b) zero supply voltage (c) 1 (d) 0 6. It is desirable to eliminate 5th harmonic voltage from the phase voltage of an alternator. The coils should be short-pitched by an electrical angle of (a) 30° (b) 36° (c) 72° (d) 18° 7. The core flux of a practical transformer with a resistive load (a) is strictly constant with load changes (b) increases linearly with load (c) increases as the square root of the load (d) decreases with increased load 8. A 50 Hz balanced three-phase, Y-connected supply is connected to a balanced three phase Y-connected load. If the instantaneous phase-a of the supply voltage is Vcos( t) and the phase-a of the load current is Icos( t-f), the instantaneous three-phase power is (a) a constant with a magnitude of VIcosf (b) a constant with a magnitude of (3/2)VIcosf (c) time-varying with an average value of (3/2) VIcosf and a frequency of 100 Hz. (d) time-varying with an average value of VIcosf and a frequency of 50 Hz. 9. In the protection of transformers, harmonic restraint is used to guard aainst (a) magnetizing inrush current (b) unbalanced operation (c) lightning (d) switching over-voltages 10. A lossless radial transmission line with surge impedance loading (a) takes negative VAR at sending end and zero VAR at receiving end (b) takes positive VAR at sending end and zero VAR at receiving end (c) has flat voltage profile and unity power factor at all points along it (d) has sending end voltage higher than receiving end voltage and unity power factor at sending end 11. If an energy meter disc makes 10 revolutions in 100 seconds when a load of 450 W is connected to it, the meter constant (in rev/kWh) is (a) 1000 (b) 500 (c) 1600 (d) 800 1.17 The minimum number of wattmeter (s) required to measure 3-phase, 3-wire balanced or unbalanced power is (a) 1 (b) 2 (c) 3 (d) 4 12. Among the following four, the slowest ADC (analog-to-digital converter) is (a) parallel comparator (i.e., flash) type (b) successive approximation type (c) integrating type (d) counting type 13. The output of a logic gate is —1“ when all its inputs are at logic —0“. The gate is (a) a NAND or an EX-OR gate (b) a NOR or an EX-OR gate (c) an AND or an EX-NOR gate (d) a NOR or an EX-NOR gate 14. An op-amp has an open-loop gain of 105 and an open-loop upper cutoff frequency of 10 Hz. If this op-amp is connected as an amplifier with a closed-loop gain of 100, then the new upper cutoff frequency is (a) 10 Hz (b) 100 Hz (c) 10 kHz (d) 100 kHz 15. The main reason for connecting a pulse transformer at the output stage of a thyristor triggering circuit is to (a) amplifying the power of the triggering pulse (b) provide electrical isolation (c) reduce the turn on time of the thyristor (d) avoid spurious triggering of the thyristor due to noise 16. AC-to-DC circulating current dual converters are operated with the following relationship between their triggering angles (a1 and a2). (a) a1 + a2 = 180° (b) a1 + a2 = 360° (c) a1 - a2 = 180° (d) a1 + a2 = 90° 17. In case of an armature controlled separately excited dc motor drive with closed- loop speed control, an inner current loop is useful because it (a) limits the speed of the motor to a safe value (b) helps in improving the drive energy efficiency (c) limits the peak current of the motor to the permissible value (d) reduces the steady state speed error
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