# If a dc voltmeter is made from an ammeter having a full scale deflection of I00 micro amperes; then its sensitivity (in k-ohm/V)will be

1.  1

2.  10

3.  100

4.  1000

4

10

Explanation :
No Explanation available for this question

# When damping of an instrument is adjusted to enable the pointer to rise quickly to its deflected position without overshooting, in that case the instrument is said to be

2.  off-beat

3.  over-damped

4.  under-damped

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Explanation :
No Explanation available for this question

# The resistance of two coils of a wattmeter are 0-0.1 ohm and 1000 ohms respectively and both are non-inductive, The load current is 20 A and the voltage across the load is 30 V. In one of the two ways of connecting the voltage coil the error in the reading would be

1.  0.1 % too high

2.  0.2% too high

3.  0.15% too high

4.  zero

4

0.15\% too high

Explanation :
No Explanation available for this question

# The measurement of a quantity

1.  is an act of comparison of an unknown quantity with another quantity

2.   is a act of comparison of an unknown quantity with a known quantity whose accuracy may be known or may not be known

3.  is an act of comparison of an unknown quantity with a predefined acceptable standard which is accurately known

4.  none of these

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is an act of comparison of an unknown quantity with a predefined acceptable standard which is accurately known

Explanation :
No Explanation available for this question

# The measurement of a quantity

1.  is an act of comparison of an unknown quantity with another quantity

2.   is a act of comparison of an unknown quantity with a known quantity whose accuracy may be known or may not be known

3.  is an act of comparison of an unknown quantity with a predefined acceptable standard which is accurately known

4.  none of these

4

is an act of comparison of an unknown quantity with a predefined acceptable standard which is accurately known

Explanation :
No Explanation available for this question

# A piezo electric transducer has the following parameter values : Crystal capacitance = 10-9F Cable capacitance = 2x 10-10 0F Charge sensitivity = 4 x 10-6 coulomb/cm If the oscilloscope used for read-out has an input resistance of 1 MW in parallel with C = 4 x 10-10 F, then the voltage sensitivity constant will be

1.  2500 V/cm

2.  3334 V/cm

3.  4000 V/cm

4.  4500 V/cm

4

3334 V/cm

Explanation :
No Explanation available for this question

# The voltage of a circuit is measured by a voltmeter having an input impedance comparable with the output impedance of the circuit there by causing error in voltage measurement. This error may be called

1.  Gross error

2.  Random error

3.  Error caused by misuse of instrument

4

Random error

Explanation :
No Explanation available for this question

# In the center zero analog ammeter having a range of-10 A to + 10 A, there is a detectable change of the pointer from its zero position on either side of the scale only if the current reaches a value of 1 A(on either side). The ammeter has a

1.  resolution of 1 A

2.  dead zone of 1 A

3.  dead zone of 2 A

4.  sensitivity of 1 A

4

Explanation :
No Explanation available for this question

# A d.c. circuit can be represented by an internal voltage source of 50 V with an output resistance of 100 VI In order to achieve 99 percent accuracy for voltage measurement across its terminals, the voltage measuring device should have a resistance of

1.  at least 10 MΩ

2.  100 kΩ

3.  at least 10Ω

4.  none of these

4

at least 10 MΩ

Explanation :
No Explanation available for this question

# The maximum current that can be drawn from, a saturated Weston cell without damaging it, is

1.  100 mA momentarily

2.  100 A continuously

3.  100 A momentarily

4.  1 mA momentarily

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