A 1000 ohms/V meter is used to measure a resistance on 150 V scale. The meter resistance is

1.  150 kΩ

2.  1kΩ

3.  6.67 ohms

4.  0.001 ohm

4

6.67 ohms

Explanation :
No Explanation available for this question

One single-phase wattmeter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. The power factor of the load will be

1.  1

2.  0.8

3.  0.7

4.  0.6

4

0.8

Explanation :
No Explanation available for this question

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 decreased or increased depending on the direction Of the d.c. field.

4

either decreased or increased 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 read nearly

1.  10 mA

2.  8 mA

3.  2 mA

4.  Zero

4

Zero

Explanation :
No Explanation available for this question

The RTD 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 possess 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

A resistance strain gauge with a gauge factor of 3 is fastened to a steel member subjected to a stress of 100 N/mm2. The modulus of elasticity of steel is approximately 2 x 105 N/mm2. The percentage change in resistance is

1.  1.5

2.  1

3.  0.15

4.  0.1

4

0.15

Explanation :
No Explanation available for this question

A periodic signal shown is applied to the ideal diode circuit below. Find the RMS value for the output voltage vo (t)

1.  10

2.  2

3.  1/√2

4.  √2

4

√2

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 gauge is expressed in terms of a gauge factor. For a certain application, a gauge factor of 100 is desired. The proper strain gauge to be used in this case would be

1.  constantan strain gauge

2.  nichroma-V strain gauge

3.  semiconductor strain gauge

4.  platinum-tungsten alloy strain gauge

4

semiconductor strain gauge

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