61. An L.V.D.T.
    

1. 1. exhibits linear characteristics up to a displacement of ± 5 mm

   
   
   

   2. has a linearity of 0.05%

   
   
   

   3. has an infinite resolution and a high sensitivity which is of the order of 40 V/mm

   
   
   

   4. all of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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62. Capacitive transducers are normally used for
    

1. 1. static measurements

   
   
   

   2. dynamic measurements

   
   
   

   3. both static and dynamic measurements

   
   
   

   4. transient measurements

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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63. 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

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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64. 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

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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65. For the ac bridge circuit shown in the figure at balance, the value of R_d, L_d and Q_d will be respectively
    

1. 1. 	Ra	Rb;	RaRc	;ωCbRb
      	Rc		Cb

   
   
   

   2. 	Rb	Rc;	RaRc	;ωCbRb
      	Ra		Cb

   
   
   

   3. 	Rb	Rc;RaRcCb;ωCbRc
      	Ra

   
   
   

   4. 	Ra	Rc;RaRcCb;ωCbRb
      	Rb

   
   
   

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1. View Hint View Answer Discuss in Forum

   From balance condition
   

   RaRc = (RdjωLd	R
   	1 + lωcbRb

   
   or (1 + ω_cbR_b)R_aR_c = R_b(R_d + jωL_d
   or R_bR_d = R_aR_c
   

   ∴ Rd =	RaRc
   	Rb

   
   and ωC_bR_bR_c = ωR_bL_d
   or L_d = R_aR_cC_b

   Correct Option: D

   From balance condition
   

   RaRc = (RdjωLd	R
   	1 + lωcbRb

   
   or (1 + ω_cbR_b)R_aR_c = R_b(R_d + jωL_d
   or R_bR_d = R_aR_c
   

   ∴ Rd =	RaRc
   	Rb

   
   and ωC_bR_bR_c = ωR_bL_d
   or L_d = R_aR_cC_b

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