# The internal resistance of a saturated Weston

1.  few ohm

2.  few kilo ohm

3.  few hundreds of ohm

4.  fraction of ohm

4

few hundreds of ohm

Explanation :
No Explanation available for this question

# A 1 mA ammeter has a resistance of 100Ω It is to be converted to a 1 A ammeter. The-value of shunt resistance is

1.  0.001Ω

2.  0.1001Ω

3.  100000Ω

4.  100Ω

4

0.1001Ω

Explanation :
No Explanation available for this question

# The decrease in the value of emf of an unsaturated Weston cell is about

1.  1 V per year

2.  1 mV per year

3.  5-10 V per year

4.  30-50 V Per year

4

1 mV per year

Explanation :
No Explanation available for this question

# If an analog PMMC 0 -10 A ammeter is provided with no controlling mechanision and the moving parts are free to rotate, what will be the reading of the instrument if a current of 1 A(d.c ) passed through the moving coil (torque produced is sufficient to overcome the frictional losses)

1.  1A

2.  10 A

3.  The pointer will continuously rotate

4.  The pointer will remain stationary

4

The pointer will continuously rotate

Explanation :
No Explanation available for this question

# A voltage of 200 V produces a deflection of 900 in PMMC spring controlled instrument. If the same instruments provided with gravity control, what would be the deflection

1.  900

2.  450

3.  64.20

4.  Cannot be known from the data given

4

450

Explanation :
No Explanation available for this question

# A spring producers a controlling torque of 16 x 10-6 Nm for a deflection of 1200. Suppose its width and length are made two times their original value and the thickness is halved, then value of controlling torque for the same deflection will be

1.  16 x 10-6 Nm

2.  8 x 10-6 Nm

3.  32 x 10-6 Nm

4.  2 x 10-6 Nm

4

2 x 10-6 Nm

Explanation :
No Explanation available for this question

# Air friction damping should not be used where the deflecting torque in the instrument is produced due to

1.  magnetic field

2.  electrostatic field

3.  thermo-electric emf

4.  none of these

4

none of these

Explanation :
No Explanation available for this question

# Fluid friction damping can be used in

1.  horizontally mounted instrument

2.  vertically mounted instrument

3.  both in horizontally and vertically mounted instrument

4.  none of these

4

vertically mounted instrument

Explanation :
No Explanation available for this question

# A wattmeter has e full scale range of 2500 W. It has an error 1 % of true value. If true power is 1250 W, range of reading will be

1.  1225W - 1275W

2.  1245 W - 1255 W

3.  1200 W - 1300 W

4.  1237.5 W - 1262.5 W

4

1237.5 W - 1262.5 W

Explanation :
No Explanation available for this question

# A d'Arsonval galvanometer uses a light and scale arrangement. The light source is placed 1 m away from the moving system of galvanometer. The arrangement uses a circular scale calibrated in . mm. The-deflection indicated by the Scale is

1.  1000 mm

2.  2000 mm

3.  500 mm

4.  none of these

4