One Stop GATE Forum: E&E GATE paper

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1
          The armature resistance of a permanent magnet
            dc motor is 0.8 W. At no load, the motor draws 1.5 A from a supply
            voltage of 25 V and runs at 1500 rpm. The efficiency of the motor
            while it is operating on load at 1500 rpm drawing a current of 3.5 A
            from the same source will be
        
        
          Options
          
            
                
              
                  A) 48.0%
                  B) 57.1%

                  
                
                
                  C) 59.2%
                  D) 88.8%
                
              
            
          
        
        
          

          

        
        
          Correct Answer
          A
        
        
          

        
        
          2
          A bipolar junction transistor (BJT) is used as
            a power control switch by biasing it in the cut-off region (OFF
            state) or in the saturation region (ON state). In the ON state, for
            the BJT
        
        
          Options
          
            
                
              
                  A) both the base-emitter and base-collector
                    junctions are reverse biased
                  B) the base-emitter junction is reverse biased, and
                    the base-collector junction is forward biased
                
                
                  C)
                    the base-emitter junction is forward biased, and the
                    base-collector junction is reverse biased
                  
                  D) both the base-emitter and base-collector
                    junctions are forward biased
                
              
            
          
        
        
          

          

        
        
          Correct Answer
          D
        
        
          

        
        
          3
          For the equation,

            s³- 4s²+ s + 6 = 0

            the number of roots in the left half of s-plane will be
        
        
          Options
          
            
                
              
                  A) zero
                  B) one

                  
                
                
                  C) two 
                  D) three

                  
                
              
            
          
        
        
          

          

        
        
          Correct Answer
          C
        
        
          

        
        
          4
          The Q - meter works on the principle of
        
        
          Options
          
            
                
              
                  A) mutual inductance 
                  B) self inductance

                  
                
                
                  C) series resonance 
                  D) parallel resonance
                
              
            
          
        
        
          

          

        
        
          Correct Answer
          C
        
        
          

        
        
          5
          A 800 kV transmission line is having per phase
            line inductance of 1.1 mH/km and per phase line capacitance of 11.68
            nF/km. Ignoring the length of the line, its ideal power transfer
            capability in MW is
        
        
          Options
          
            
                
              
                  A) 1204 MW 
                  B) 1504 MW
                
                
                  C) 2085 MW 
                  D) 2606 MW
                
              
            
          
        
        
          

          

        
        
          Correct Answer
          C
        
        
          

        
        
          6
          The insulation strength of an EHV transmission
            line is mainly governed by
        
        
          Options
          
            
                
              
                  A) load power factor 
                  B) switching over-voltages

                  
                
                
                  C) harmonics 
                  D) corona
                
              
            
          
        
        
          

          

        
        
          Correct Answer
          B
        
        
          

        
        
          7
          
            If the following program is executed in a icroprocessor, the
            number of instruction cycles it will take from START to HALT is
             
            

                
              
                  START MVI A, 14H ; Move 14H to register A

                    SHIFT   RLC           
                    ; Rotate left without carry

                                  JNZ
                    SHIFT ; Jump on non-zero to SHIFT

                                 
                    HALT
                
              
            
          
        
        
          Options
          
            
                
              
                  A) 4
                  B) 8
                
                
                  C) 13
                  D) 16
                
              
            
          
        
        
          

          

        
        
          Correct Answer
          C
        
        
          

        
        
          8
          A moving iron ammeter produces a full scale
            torque of 240 mNm with a deflection of
            120° at a current of 10 A. The rate of change of self inductance (mH/radian)
            of the instrument at full scale is
        
        
          Options
          
            
                
              
                  A) 2.0 mH/radian          
                  B) 4.8 mH/radian
                
                
                  C) 12.0 mH/radian      
                  D) 114.6 mH/radian
                
              
            
          
        
        
          

          

        
        
          Correct Answer
          B
        
        
          

        
        
          9
          The output voltage waveform of a three-phase
            square-wave inverter contains
        
        
          Options
          
            
                
              
                  A) only even harmonics 
                  B) both odd and even harmonics
                
                
                  C) only odd harmonics 
                  D) only triplen harmonics

                  
                
              
            
          
        
        
          

          

        
        
          Correct Answer
          C
        
        
          

        
        
          10
          If P and Q are two random events, then the
            following is TRUE

          
        
        
          Options
          
            
                
              
                  A) Independence of P and Q implies that probability
                    (P  Q
                    ) = 0

                  
                  B) Probability (P 
                    Q ) 
                    Probability (P) + Probability (Q)

                  
                
                
                  C) If P and Q are mutually exclusive, then they
                    must be independent

                  
                  D) Probability (P 
                    Q ) 
                    Probability (P)


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