One Stop GATE Forum: 2003- year ECE GATE Paper

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1.A source of angular frequency 1 rad/sec has a source impedance consisting of 1  
resistance in  series with 1 H  inductance. The load  that will obtain the  maximum 
power transfer is 
  (a)  1   resistance 
 (b)  1   resistance in parallel with 1 H inductance 
 (c)  1   resistance in series with 1 F capacitor 
 (d)  1   resistance in parallel with 1 F capacitor 

2.  A series RLC circuit has  a resonance frequency of 1 kHz and a quality factor Q = 
100. If each R, L and C is doubled from its original value, the new Q of the circuit 
is 
  (a)  25  (b)  50  (c)  100  (d) 200 

3.  n-type silicon is obtained by doping silicon with 
 (a)  Germanium  (b)  Aluminum  (c)  Boron  (d) Phosphorus 

4.  The bandgap of silicon at 300 K is 
 (a)  1.36 eV  (b)  1.10 eV  (c)  0.80 eV  (d) 0.67 eV 

5.  The  intrinsic  carrier  concentration of  silicon  sample of  300  K is  1.5  ×1016/m3. If 
after doping,  the number of majority  carriers is  5 × 1020/m3, the minority carrier 
density is 
  (a)  4.50 × 101 1/m3      (b)  3.33 × 104/m3 
 (c)  5.00 × 102 0/m3      (d)  3.00 × 10- 5/m3 

6.  Choose  proper  substitutes  for  X  and  Y  to  make  the  following  statement  correct 
Tunnel  diode  and  Avalanche  photodiode  are  operated  in  X  bias  and  Y  bias 
respectively. 
  (a)  X: reverse, Y: reverse   (b)  X: reverse, Y: forward 
 (c)  X: forward, Y: reverse  (d)  X: forward, Y: forward 

7.  For  an  n-channel  enhancement  type  MOSFET,  if  the  source  is  connected  at  a 
higher  potential than  that  of  the bulk (i.e. VS B  > 0), the threshold  voltage VT   of 
the MOSFET will 
  (a)  remain unchanged    (b)  decrease 
 (c)  change polarity      (d)  increase 

8.  Choose  the correct match for input resistance  of various amplifier configurations 
shown below. 

 Configuration  Input resistance 
CB: Common Base  LO: Low 
CC: Common Collector  MO: Moderate 
CE: Common Emitter  HI: High 
  (a)  CB-LO, CC-MO, CE-HI   (b)  CB-LO, CC-HI, CE-MO 
 (c)  CB-MO, CC-HI, CE-LO   (d)  CB-HI, CC-LO, CE-MO 

9.  If  the  differential  voltage  gain  and  the  common  mode  voltage  gain  of  a 
differential  amplifier  are  48  dB  and  2  dB  respectively,  then  its  common  mode 
rejection ratio is  
  (a)  23 dB  (b)  25 dB  (c)  46 dB  (d) 50 dB 

10.  Generally, the gain of a transistor amplifier falls at high frequencies due to the  
 (a)  internal capacitances of the device 
 (b)  coupling capacitor at the input 
 (c)  skin effect 
 (d)  coupling capacitor at the output 

11.  The number of distinct Boolean expression of 4 variables is 
 (a)  16  (b)  256  (c)  1024  (d) 65536 

12.  The minimum number of comparators required to build an 8 it flash ADC is  
 (a)  8  (b)  63  (c)  255  (d) 256 

13.  The output of the 74 series of TTL gates is taken from a BJT in 
 (a)  totem pole and common collector configuration 
 (b)  either totem pole or open collector configuration 
 (c)  common base configuration 
 (d)  common collector configuration 

14.  Without any additional circuitry, an 8:1 MUX can be used to obtain 
 (a)  some but not all Boolean functions of 3 variables 
 (b)  all function of 3 variables but none of 4 variables 
 (c)  all functions of 3 variables and some but not all of 4 variables 
 (d)  all functions of 4 variables 

15.A  0  to  6  counter  consists  of  3  flip  flops  and  a  combination  circuit  of  2  input 
gate(s). The combination circuit consists of 
  (a)  one AND gate      (b)  one OR gate 
 (c)  one AND gate and one OR gate  (d)  two AND gates 

Author	Message
Priya Groupie Joined: 04Jan2007 Online Status: Offline Posts: 82	Topic: 2003- year ECE GATE Paper Posted: 14Feb2007 at 4:58pm
	1.A source of angular frequency 1 rad/sec has a source impedance consisting of 1 resistance in series with 1 H inductance. The load that will obtain the maximum power transfer is (a) 1 resistance (b) 1 resistance in parallel with 1 H inductance (c) 1 resistance in series with 1 F capacitor (d) 1 resistance in parallel with 1 F capacitor 2. A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q = 100. If each R, L and C is doubled from its original value, the new Q of the circuit is (a) 25 (b) 50 (c) 100 (d) 200 3. n-type silicon is obtained by doping silicon with (a) Germanium (b) Aluminum (c) Boron (d) Phosphorus 4. The bandgap of silicon at 300 K is (a) 1.36 eV (b) 1.10 eV (c) 0.80 eV (d) 0.67 eV 5. The intrinsic carrier concentration of silicon sample of 300 K is 1.5 ×1016/m3. If after doping, the number of majority carriers is 5 × 1020/m3, the minority carrier density is (a) 4.50 × 101 1/m3 (b) 3.33 × 104/m3 (c) 5.00 × 102 0/m3 (d) 3.00 × 10- 5/m3 6. Choose proper substitutes for X and Y to make the following statement correct Tunnel diode and Avalanche photodiode are operated in X bias and Y bias respectively. (a) X: reverse, Y: reverse (b) X: reverse, Y: forward (c) X: forward, Y: reverse (d) X: forward, Y: forward 7. For an n-channel enhancement type MOSFET, if the source is connected at a higher potential than that of the bulk (i.e. VS B > 0), the threshold voltage VT of the MOSFET will (a) remain unchanged (b) decrease (c) change polarity (d) increase 8. Choose the correct match for input resistance of various amplifier configurations shown below. Configuration Input resistance CB: Common Base LO: Low CC: Common Collector MO: Moderate CE: Common Emitter HI: High (a) CB-LO, CC-MO, CE-HI (b) CB-LO, CC-HI, CE-MO (c) CB-MO, CC-HI, CE-LO (d) CB-HI, CC-LO, CE-MO 9. If the differential voltage gain and the common mode voltage gain of a differential amplifier are 48 dB and 2 dB respectively, then its common mode rejection ratio is (a) 23 dB (b) 25 dB (c) 46 dB (d) 50 dB 10. Generally, the gain of a transistor amplifier falls at high frequencies due to the (a) internal capacitances of the device (b) coupling capacitor at the input (c) skin effect (d) coupling capacitor at the output 11. The number of distinct Boolean expression of 4 variables is (a) 16 (b) 256 (c) 1024 (d) 65536 12. The minimum number of comparators required to build an 8 it flash ADC is (a) 8 (b) 63 (c) 255 (d) 256 13. The output of the 74 series of TTL gates is taken from a BJT in (a) totem pole and common collector configuration (b) either totem pole or open collector configuration (c) common base configuration (d) common collector configuration 14. Without any additional circuitry, an 8:1 MUX can be used to obtain (a) some but not all Boolean functions of 3 variables (b) all function of 3 variables but none of 4 variables (c) all functions of 3 variables and some but not all of 4 variables (d) all functions of 4 variables 15.A 0 to 6 counter consists of 3 flip flops and a combination circuit of 2 input gate(s). The combination circuit consists of (a) one AND gate (b) one OR gate (c) one AND gate and one OR gate (d) two AND gates
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