TRB exam online practice test for Electronics and Communication Engineering dept provides you with ample practice material for TRB exam preparation for cse department which adheres to the real exam format. Each TRB - ECE exam practice test has 10 questions. After completing click on to the COMPLETE TEST to know the score and the correct answers.


Electronics and Communication Engineering - TRB Online Practice Test - 4

  • Online Practice Test - ECE
   

1.
  The boolean function y = AB + CD is to be realized using only 2-input NAND gates. The minimum number of gates required is :.
  • A.   2
  •  
  • B.   3
  •  
  • C.   4
  •  
  • D.   5
  Options: A    B    C    D   
   
 
   

2.
  If a network has 68 nodes and 200 branches, the number of independent loop currents are :.
  • A.   68
  •  
  • B.   200
  •  
  • C.   132
  •  
  • D.   133
  Options: A    B    C    D   
   
   

3.
  At room temperature and at normal atmospheric condition , the values of the bandgaps of Ge ,Si and GaAs are :.
  • A.   0.7 eV, 1.21 eV and 1.5 eV respectively
  •  
  • B.   1.12 eV, 1.42 eV and 0.66 eV respectively
  •  
  • C.   0.66 eV, 1.12 eV and 1.42 eV respectively
  •  
  • D.   1.21 eV, 1.5 eV and 0.7 eV respectively
  Options: A    B    C    D   
   
 
   

4.
  For a series RLC circuit if R= 0.5Ω , L=1 H , C =1 F , the value of Q is given by :.
  • A.   0.5
  •  
  • B.   2
  •  
  • C.   1
  •  
  • D.   5
  Options: A    B    C    D   
   
   

5.
  To obtain P type semiconductor , intrinsic semiconductor must be doped with :.
  • A.   Phosphorous
  •  
  • B.   Boron
  •  
  • C.   Antimony
  •  
  • D.   Arsenic
  Options: A    B    C    D   
   
 
   

6.
  A 4-bit MOD-16 ripple counter uses J-K flip –flops. If the propagation delay of each flip –flop is 50 ns , The maximum clock frequency is equal to _______ ..
  • A.   20 MHz
  •  
  • B.   10 MHz
  •  
  • C.   5 MHz
  •  
  • D.   4 MHz
  Options: A    B    C    D   
   
   

7.
  The basic memory cell of a dynamic RAM consists of :.
  • A.   a capacitor
  •  
  • B.   a transistor
  •  
  • C.   a flip – flop
  •  
  • D.   a transistor acting as a capacitor
  Options: A    B    C    D   
   
 
   

8.
  The power spectral density of a real signal is :.
  • A.   Complex, even and non- negative
  •  
  • B.   Real, even and non- negative
  •  
  • C.   Real, even and negative
  •  
  • D.   Complex, odd and negative
  Options: A    B    C    D   
   
   

9.
  Double spotting in superherterodyne receiver is caused by :.
  • A.   Poor front end rejection
  •  
  • B.   Misalignment of receivers
  •  
  • C.   Detuning of one or more IF systems
  •  
  • D.   Non – functioning of AGC
  Options: A    B    C    D   
   
 
   

10.
  Consider a discrete times system with input x(n) and output y(n) related by y (n) = log10x(n). This system is .
  • A.   Non – causal, stable
  •  
  • B.   Causal, stable
  •  
  • C.   Causal, not stable
  •  
  • D.   Non – causal, not stable
  Options: A    B    C    D   
   

Complete Test
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