Question with Answer BSNL JE 

1. A problem with class-B push push-pull amplifiers is that they usually suffer from :
(a) Harmonic distortion                     
(b) Intermodulation distortion
(c) Cross-over distortion                               
(d) None of these                                           
Ans (c)
2. One of the following is not a semiconductor material :
(a) Gallium Arseinde                                       
(b) Indium
(c) Germanium                          
(d) Silicon                                                           
Ans (b)
3. The DC to DC converter that is referred to as constant power converter is the :
(a) push-pull converter                             
(b) ringing choke type converter
(c) half, bridge converter           
(d) full bridge converter                                               
Ans (b)
4.   If in the circuit of figure, the diode has a forward biased resistance of 0Ω and a reverse biased resistance of M, then the optimum value for (R) would be :
(a) M                                                               
(b) 0Ω
(c) 0 K                                                              
(d) 5 M                                                                
Ans (c)
5.   In microwave communication systems using circularly polarized beams, the receiving antenna should be :
(a) helical antenna                                    
(b) horn antenna
(c) crossed rhombic antenna                                                     
(d) biconical loop antenna                           
Ans (a)
6.   In general logic gates whose all output entries are logic ‘1’ expect for one entry that is logic ‘0’ are :
(a) AND, OR                                                       
(b) NAND, NOR
(c) NAND, OR                                                      
(d) AND, NOR                                                   
Ans (c)
7.   Of the following, logic family that uses non-saturated transistors is :
(a) TTL                                                       
(b) CMOS
(c) DTL                                                       
(d) ECL                                                                 
Ans (d)
8.   During the daytime, the ionosphere consists of :
(a) D, E and F2 layers
(b) D, E, F1 and F2 layers
(c) E and F2 layers
(d) D, E and F1 layers                                    
Ans (b)
9.   A currentmeter with sensitivity of μA shall have ohms per volt rating of :
(a) 0000                                                            
(b) 000
(c) 0                                                               
(d) None of these                                           
Ans (a)
10.   A metal probe inserted into a rectangular waveguide through the broader wall of the guide will provide a property across the guide. This property is a :
(a) shunt                                                           
(b) reactance
(c) reverberation                                            
(d) resonance                                                   
Ans (d)
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