# An unfinished moving iron voltmeter is used to measure the voltage in an a.c circuit. If a stray d.c magnetic field having a component along the axis of the meter coil appears, the meter reading would be

1.  Unaffected

2.  decreased

3.  increased

4.  either increased or decreased depending on the direction of the d.c field

4

either increased or decreased depending on the direction of the d.c field

Explanation :
No Explanation available for this question

# A 0-10 mA PMMC ammeter reads 4 mA in a circuit. Its bottom control spring snaps suddenly. The meter will now reas nearly

1.  10mA

2.  8 mA

3.  2 mA

4.  zero

4

zero

Explanation :
No Explanation available for this question

# The RTDs use the principle of change of resistance with temperature. The properties of a conductor material to be used as an element of an RTD should posses which of the following properties

1.  The change in resistance per unit change in temperature should be as small as possible.

2.  The resistance of the materials should not have a continuous and stable relationship with temperature.

3.  The  change of resistance with temperature should not be a linear function.

4.  All of these.

4

All of these.

Explanation :
No Explanation available for this question

# Hysteresis in an instrument means

1.  Repeatability of the instrument

2.  Reliability of the instrument

3.  Change in same reading when input is first increased and then decreased.

4.  The inaccuracy due to change in temperature .

4

Change in same reading when input is first increased and then decreased.

Explanation :
No Explanation available for this question

# Strain sensing transducers are mode of various materials in various sizes and shapes. The sensitivity of a strain guage is expressed in terms of a guage factor. For a certain applications, a guage factor of 100 is desired. The proper strain guage to be used in this case would be

1.  Constanatan strain guage

2.  Nichroma-V strain guage

3.  Semiconductor strain guage

4.  Platinum tungsten alloy strain guage

4

Semiconductor strain guage

Explanation :
No Explanation available for this question

# It is required to measure temperature in the range of 13000 C to 15000 C. The most suitable thermocouple to be used as a transducer would be

1.  Chromel-constantan

2.  Iron-constantan

3.  Chromel-alumel

4.  Platinum-rhodium

4

Platinum-rhodium

Explanation :
No Explanation available for this question

# 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 ½ 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: The relationship between input displacement and output voltage is almost linear The range of displacement that can be measured is wide 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 simple d.c. potentiometer is to be standardized by keeping the sidewire setting at 1.0813 V. If by mistake the setting is at 1.0138 V and the standardization is made to obtain a source voltage of 1.0318 V, then the reading of the potentiometer will be

1.  1.0138 V

2.  1.0183 V

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 closed coil spring has a stiffness of 20 × 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 × 10 -6 N/m

2.  80 × 10 -6 N/m

3.  10 × 10 -6 N/m

4.  160 × 10 -6 N/m

4