Question with Answer BSNL (JE)

1. A sum of three numbers is 140. First number is twice the second number and 4 times the third number. The highest number will be :
(a) 60                                                                 
(b) 120
(c) 90                                                                 
(d) 80                                                                   
Ans (d)
2. In a broadcast superheterodyne receiver, the :
(a) local oscillator operates below the signal frequency
(b) mixer input must be tuned to the signal frequency
(c) local oscillator frequency is normally double the IF
(d) RF amplifier normally works at 455 kHz above the carrier frequency                                                 
Ans (b)
3. Find the wrong spelling word :
(a) empanel                                                          
(b) endenger
(c) denigrate                                                       
(d) tantamount                                                
Ans (b)
4. Which one of the following will give the sum of full-adder as output ?
(a) Three input majority circuit  
(b) Three bit parity checker
(c) Three bit comparator
(d) Three bit counter                                            
Ans (d)
5. The HV anode supply for the picture tube of TV receiver is generated in the :
(a) mains transformer                                           
(b) vertical output stage
(c) horizontal output stage                                                         
(d) horizontal deflection oscillator           
Ans (c)
6.   The impedance of a 10μF capacitor at 50 Hz.
(a) 314                                                                 
(b) 318
(c) 3180                                                                   
(d) 31                                                                   
Ans (b)
7. When the modulation index of AM wave is doubled, antenna current is also doubled. The AM system being used is :
(a) A3H                                                                     
(b) A5C
(c) A3J                                                               
(d) A3                                                                   
Ans (c)
8. If negative feedback is introduced in an amplifier in a shunt current configuration, then the input resistance will :
(a) increase
(b) remain the same
(c) decrease
(d) increase, decrease or remain the same depending upon input                                                           
Ans (c)
9. In control system compensation methods, lead compensation network :
(a) achieve the desired results through the merits of its attenuation properties at high frequencies
(b) in the frequency domain decreases the bandwidth but increases phase margin
(c) in the frequency domain increases the bandwidth and phase margin
(d) improves steady-state accuracy but reduces bandwidth                                                                        
Ans (b)
10. Since noise phase-modulates the FM wave, as the noise sideband frequency approaches the carrier frequency, the noise amplitude :
(a) remains constant                                                  
(b) is decreased
(c) is increased                                                     
(d) is equalized                                                
Ans (b)
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