# An LVDT is used to measure, displacement. The output of the LVDT is connected to a voltmeter , of range 0 to 5 V through an amplifier having a gain of 250. For a displacement of 0.5 mm, the output of the LVDT is 1/2 mV. The sensitivity of the instrument would be

1.  0 .1 V/mm

2.  0.5 V/mm

3.  1 V/mm

4.  5 V/mm

4

1 V/mm

Explanation :
No Explanation available for this question

# 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, 2 and 3 are correct

2.  2 and 3 are correct

3.  1 and 2 are correct

4.  1 and 3 are correct

4

1 and 3 are correct

Explanation :
No Explanation available for this question

# A shunt type ohm meter is shown in the figure below. With Rx disconnected, the meter reads full scale. S represents the meter current as a fraction of full scale current with Rx connected such that S=Rx /Rx+Rp The value of Rp is given by

1.  Rm

2.  R1+Rm

3.  R1Rx/(R1+Rm)

4.  R1Rm/(R1+Rm)

4

R1Rm/(R1+Rm)

Explanation :
No Explanation available for this question

# The power in a resistor R is estimated by measuring the voltage and current using the voltmeter-ammeter method. Two different arrangements can be used as shown in circuits I and IL Less erroneous results are obtained by adopting

1.  circuit l for low values of R

2.  circuit II for values of R

3.  circuit I for values of R

4.  circuit II for low and high values of R

4

circuit l for low values of R

Explanation :
No Explanation available for this question

# A simple d.c. potentiometer is to be standardised by keeping the side wire setting at 1. 0813V. If by mistake, the setting is at 1.0138 V and, the standardisation is made to obtain a source voltage of 1.0318V, then the reading of the potentiometer will be

1.  1.0138 V

2.  1.0183V

3.  (1.0138)2/1.0183 V

4.  (1.0138)2 V

4

(1.0138)2/1.0183 V

Explanation :
No Explanation available for this question

# A galvanometer is tested shown in figure in the circuit, where E = 1.5 V,R1 = 1.0 ohm, R2 2500 ohm and is variable With R3, set at 450 ohm the galvanometer deflection is 140 mm and with R3 set at 950 ohm the galvanometer deflection is 70 mm. The resistance of the galvanometer is

1.  99ohm

2.  49ohm

3.  25ohm

4.  10ohm

4

49ohm

Explanation :
No Explanation available for this question

# A closed coil spring has a stiffness of 20 x 10-6 N/m. If diameter of the wire is doubled, its outer diameter is made two times and its number of turns are made two times, the stiffness of then new spring will be

1.  20 x 10-6 N/m

2.  80 x 10-6 N/m

3.  10 x 10-6 N/m

4.  160 x 10-6 N/m

4

20 x 10-6 N/m

Explanation :
No Explanation available for this question

# The effective reactance of an inductive coil

1.  increases because of stray capacitance as the frequency increases

2.  decreases because of stray capacitances as the frequency increases

3.  remain the same irrespective of the increase in frequency even if stray series capacitances are present

4.  none of these

4

decreases because of stray capacitances as the frequency increases

Explanation :
No Explanation available for this question

# A compensated wattmeter has its reading corrected for error due to the

1.  frequency

2.  friction

3.  power consumed in current coil

4.  power consumed in potential coil

4

power consumed in potential coil

Explanation :
No Explanation available for this question

# While measuring power in three phase Load by two wattmeter method, the reading of the two wattmeter will be equal and opposite when

1.  power factor is unity

3.  phase angle is between 600 and 900

4.  the load is purely inductive

4