Question with Answer BSNL JE

1. Frequencies in the UHF range propagate by means of :
(a) Ground waves                                                
(b) Sky waves
(c) Surface waves                                                    
(d) Space waves                                                              
Ans (d)
2.  The input impedance of a short-circuited lossless transmission line quarter wave long is :
(a) Purely, reactive
(b) Purely, resistive
(c) Infinite
(d) Dependent on the characteristics impedance of the line                                                                       
Ans (c)
3.  The shadow mask in a color picture tube is used to :
(a) reduce x-ray emission
(b) ensure that each beam hits only its own dots
(c) increase screen brightness
(d) provide degaussing for the screen              
Ans (b)
4.  Double precision constants in comparison with single precision constants have twice the :
(a) significant digits in decimal representation
(b) accuracy
(c) range of magnitude
(d) number of binary digits for representation          
Ans (a)
5.   A 3-phase star connected load has one capacitor in R phase and two resistors of equal value in the other two phases. If the phase sequence is RBY, then :
(a) VBO > VYO                                                
(b) VBO < VYO
(c) VBO = VYO                                                  
(d) VBO = VRY                                                      
Ans (c)
6.   Cassegrain feed is used with a parabolic reflector to :
(a) increase the gain of the system
(b) increase the bandwidth of the system
(c) reduce the size of the main reflector
(d) allow the feed to be placed at a convenient point     
Ans (d)
7.   The unit of power is in :
(a) dB                                                              
(b) watt
(c) joule                                                              
(d) dBm                                                                               
Ans (b)
8.   Consider the following statements: A clamper circuit
1. adds or subtracts a dc voltage to or from a waveform
2. does not change the shape of the waveform
3. amplifiers the waveform
Of these statements
(a) 1 and 2 are correct                                               
(b) 2 and 3 are correct
(c) 1 and 3 are correct                                           
(d) 1, 2 and 3 are correct                              
Ans (a)
9.   Indicate the false statement. The radar cross-section of a target :
(a) depends on the frequency used
(b) may be reduced by special coating of the target
(c) depends on the target, if this is nonspherical
(d) is equal to the actual cross-sectional area for small targets         
Ans (d)
10.   Which one of the following sets of gates are best suited for party checking and parity generation ?
(a) AND, or NOT gates                                              
(b) EX-OR, or EX-NOR gates
(c) NAND gates                                                           
(d) NOR gates                                                   
Ans (b)
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