The expected answers were:
                    (a)      Advantage
                             -    High sensitivity
                             -    Uniform scale
                             -    Well shielded from stray magnetic field
                             -    Low power consumption
                             Disadvantage

• More expensive than moving-iron instrument
• Only suitable for d.c. currents and voltages
• Easily damaged/Not rugged

(b)(i)  The voltage drop across the instrument, Vm = Im rm
                        Vm = 0.015 x 3  =  0.045V  =  45mV
             (ii)   Voltage drop across shunt Rs = Voltage drop across the instrument
          The current through R_s, I_s = (0.2 – 0.015)A ;  I_s = 0.185ASince Vm = I_sR_s  =  45  x  10^-3V

                         R_s  =  Vm / I_s   =  45  x  10^-3 / I_s                            

                         =  45  x  10^-3) / 0.185
                               Rs  =  0.2432Ω = 243.2mΩ

This question was on measuring instruments.  The question was popular.  Almost all the candidates attempted and got good marks in it.