Question with Answer BSNL JE 

1. A 4-bit UP/DOWN, binary ripple counter is initially reset to (0000). The UP/DOWN mode select input designated as U/D on the pin connection diagram of the IC is tied to HIGH level. What will be the counter output status after the first clock pulse.
(a) 0001                                                       
(b) 1000
(c) 1111                                                     
(d) None of these                                           
Ans (b)
2. The IC type number 74C00 belongs to :
(a) Standard TTL logic family
(b) High speed TTL family
(c) CMOS family pin compatible with TTL
(d) None of these                                         
Ans (a)
3. The slew rate of an opamp limits its large signal bandwidth and is measured in :
(a) Volts per microsecond                               
(b) Microvolts per second
(c) Volts per degree Celsius
(d) It is a dimensionless quantity                       
Ans (b)
4. One of the following IC timer type numbers can be classified as a digital timer.
(a) IC 555                                                  
(b) IC 556
(c) IC 558                                              
(d) 7240                                                               
Ans (d)
5. ZL = 200Ω and it is desired that Zi = 50Ω. The quarterwave transformer should have a characteristics impedance of :
(a) 100Ω                                                      
(b) 40Ω
(c) 10,000Ω                                                     
(d) 4Ω                                                                  
Ans (c)
6.  In a silicon crystal, the arrangement of atoms repeats periodically. This type of material is classified as :
(a) Amorphous and non-crystalline
(b) non-crystalline and epitaxial
(c) epitaxial and single crystal
(d) amorphous and single crystal                    
Ans (b)
7. A sinusoidal waveform is mathematically represented by :
(a) an EVEN function
(b) an ODD function
(c) a function that is EVEN as well as HALF WAVE SYMMETRIC
(d) an infinite number of source pulses.                  
Ans (c)
8. In class-A operation of an amplifier, the current flows through the active device for :
(a) Whole of the input cycle
(b) half of the input cycle
(c) more than half of the input cycle
(d) less than half of the input cycle                      
Ans (a)
9. Harmonic distortion in amplifiers is caused by :
(a) nonlinearity of the active device
(b) defective active device
(c) presence of shot noise
(d) positive feedback from output to input                  
Ans (d)
10.  In a certain code language QUESTION is written as SOIQNEUT. How is MOTHER written in that code again ?
(a) TEMROH                                                      
(b) HEMROT
(c) TERMOH                                     
(d) REHTOM                                                      
Ans (d)
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