One Stop GATE Forum: 2000- year ECE GATE Paper

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1. Introducing  a  resistor  in  the  emitter  of  a  common  amplifier  stabilizes  the  dc 
   operating point against variations in  
  (a)  only the temperature    (b)  only the ß of the transistor 
 (c)  both temperature and ß  (d)  none of the above 

2. The current gain of a bipolar transistor drops at high frequencies because of 
 (a)  transistor capacitances  (b)  high current effects in the base 
 (c)  parasitic inductive elements  (d)  the Early effect 

3.  An  amplifier  with  resistive negative  feedback  has  two  left half-plane poles in  its 
open-loop transfer function. The amplifier 
  (a)  will always be unstable at high frequencies       
 (b)  will be stable for all frequencies 
 (c)  may be unstable, depending on the feedback factor       
 (d)  will oscillate at low frequencies 

4.An  8  bit  successive  approximation  analog  to  digital  converter  has  full  scale 
reading of 2.55 V and its conversion  time for an  analog input of 1V is  20 s.  The 
conversion for a 2V input will be   
  (a)  10  s  (b)  20  s  (c)  40  s  (d) 50  s 

5.  The number of hardware interrupts (which require an external signal to interrupt) 
present in an 8085 microprocessor are 
  (a)  1  (b)  4  (c)  5  (d) 13 

6.  The most commonly used amplifier in sample and hold circuits is 
 (a)  a unity gain inverting amplifier   
 (b)  a unity gain non-inverting amplifier   
 (c)  an inverting amplifier with a gain of 10   
 (d)  an inverting amplifier with a gain of 100 

7. The number of comparators in a 4 bit flash ADC is 
 (a)  4  (b)  5  (c)  15    (d) 16 

8.  In  the  8085  microprocessor,  the  RST6  instruction  transfers  the  program  execution to the following location  
  (a)  30 H  (b)  24 H  (c)  48 H    (d) 60 H 

9.  The  magnitudes  of  the  open-circuit  and  short-circuit  input  impedances  of  a 
transmission line are 100  and 25  respectively. The characteristic impedance of 
the line is, 
  (a)  25   (b)  50   (c)  75     (d) 100  

10. A TEM wave is incident normally upon  a perfect conductor. The  E and H fields at 
the boundary will be, respectively.   
  (a)  minimum and minimum  (b)  maximum and maximum 
 (c)  minimum and maximum  (d)  maximum and minimum 

11. The frequency range for satellite communication is 
 (a)  1 KHz to 100 KHz     (b)  100 KHz to 10 KHz  
 (c)  10 MHz to 30 MHz    (d)  1 GHz to 30 GHz 

12. If the diameter of a  dipole antenna is increased  then

  (a)  bandwidth increases    (b)  bandwidth decreases 
 (c)  gain increases      (d)  gain decreases 

Author	Message
Arpita Groupie Joined: 04Jan2007 Online Status: Offline Posts: 73	Topic: 2000- year ECE GATE Paper Posted: 14Feb2007 at 4:37pm
	1. Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in (a) only the temperature (b) only the ß of the transistor (c) both temperature and ß (d) none of the above 2. The current gain of a bipolar transistor drops at high frequencies because of (a) transistor capacitances (b) high current effects in the base (c) parasitic inductive elements (d) the Early effect 3. An amplifier with resistive negative feedback has two left half-plane poles in its open-loop transfer function. The amplifier (a) will always be unstable at high frequencies (b) will be stable for all frequencies (c) may be unstable, depending on the feedback factor (d) will oscillate at low frequencies 4.An 8 bit successive approximation analog to digital converter has full scale reading of 2.55 V and its conversion time for an analog input of 1V is 20 s. The conversion for a 2V input will be (a) 10 s (b) 20 s (c) 40 s (d) 50 s 5. The number of hardware interrupts (which require an external signal to interrupt) present in an 8085 microprocessor are (a) 1 (b) 4 (c) 5 (d) 13 6. The most commonly used amplifier in sample and hold circuits is (a) a unity gain inverting amplifier (b) a unity gain non-inverting amplifier (c) an inverting amplifier with a gain of 10 (d) an inverting amplifier with a gain of 100 7. The number of comparators in a 4 bit flash ADC is (a) 4 (b) 5 (c) 15 (d) 16 8. In the 8085 microprocessor, the RST6 instruction transfers the program execution to the following location (a) 30 H (b) 24 H (c) 48 H (d) 60 H 9. The magnitudes of the open-circuit and short-circuit input impedances of a transmission line are 100 and 25 respectively. The characteristic impedance of the line is, (a) 25 (b) 50 (c) 75 (d) 100 10. A TEM wave is incident normally upon a perfect conductor. The E and H fields at the boundary will be, respectively. (a) minimum and minimum (b) maximum and maximum (c) minimum and maximum (d) maximum and minimum 11. The frequency range for satellite communication is (a) 1 KHz to 100 KHz (b) 100 KHz to 10 KHz (c) 10 MHz to 30 MHz (d) 1 GHz to 30 GHz 12. If the diameter of a dipole antenna is increased then (a) bandwidth increases (b) bandwidth decreases (c) gain increases (d) gain decreases
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