51. A shunt type ohmmeter is shown in the figure below. With R_x disconnected, the meter reads full scale. S represents the meter current as a fraction of full scale current with R_x connected such that
    

    S =	Rx
    	RxRp

    
    
    The value of R_p is given by

1. 1. R_m

   
   
   

   2. R₁ + R_m

   
   
   

   3. R1Rx
      (R1Rm)

   
   
   

   4. R1Rm
      (R1Rm)

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Iƒs =	E
   	R1 + Rm

   
   With R_x connected,
   

   Im =	Rx	E
   	R1 + Rx	R1 + (RmRx)/(Rm + Rx)

   
   

   =	R2 + R3	=	ERx
   	(R1 + Rx)		Rx + (R1Rm)/(R1 + Rm)

   
   

   = Iƒs	Rx
   	Rm + Rp

   
   

   where, Rp =	R1Rm
   	(R1 + Rm)

   Correct Option: D

   Iƒs =	E
   	R1 + Rm

   
   With R_x connected,
   

   Im =	Rx	E
   	R1 + Rx	R1 + (RmRx)/(Rm + Rx)

   
   

   =	R2 + R3	=	ERx
   	(R1 + Rx)		Rx + (R1Rm)/(R1 + Rm)

   
   

   = Iƒs	Rx
   	Rm + Rp

   
   

   where, Rp =	R1Rm
   	(R1 + Rm)

---

52. Consider the following statements about LVDT as a transducer:
    1. The relationship between input displacement and output voltage is almost linear.
    2. The range of displacement that can be measured is wide.
    3. It does not form a loading on the mechanical system. Of these statements

1. 1. 1, 2 and 3 are correct

   
   
   

   2. 2 and 3 are correct

   
   
   

   3. 1 and 2 are correct

   
   
   

   4. 1 and 3 are correct

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

---

53. Two inductive transducers working on the principle of change of self inductance L, are connected in push pullar rangement. If the change of inductance of transducers is 6L, the change of inductance exhibited at the output terminals is

1. 1. 6L

   
   
   

   2. 2 ΔL

   
   
   

   3. ± 2 ΔL

   
   
   

   4. zero

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

54. A capacitive transducer working on the principle of change of capacitances with change of displacement, exhibits non linear characteristic. The repose of these transducers can be made linear by using

1. 1. different arrangement

   
   
   

   2. use of an OPAMP

   
   
   

   3. working then over a small displacement range

   
   
   

   4. all of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

---

55. The dynamic characteristics of capacitive transducer are similar to those of

1. 1. low pass filters

   
   
   

   2. high pass filters

   
   
   

   3. notch filters

   
   
   

   4. band stop filters

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---