A digital voltmeter has a read out range from 0 to 999 counts. If the full scale

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Question
A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is
Options
A. 1 V
B. 0.01 V
C. 1 mV
D. 1 ?V

Correct Answer

1 mV

Explanation

Resolution is the smallest change in the quantity being measured which will cause an observable change in output. In this case it is 1 mV.

Measurements and Instrumentation problems

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1. The speed transducer using a drag cup rotor has the main advantage of
Options
A. very high accuracy
B. low energy requirement
C. cheap construction
D. all of the above

2. Two resistors R₁ = 36 ? � 5% and R₂ = 75 ? � 5% are connected in series. The total resistance is
Options
A. 111 � 0 ?
B. 111 � 2.778 ?
C. 111 � 5.55 ?
D. 111 � 7.23 ?

3. Figure shows an RC potentiometer to measure ac voltage. It is desired that V₀/V_i should be independent of frequency. The value of C should be
Options
A. 10 ?F
B. 11 ?F
C. 0.1 ?F
D. 0.09 ?F

4. Which of the following are needed both for protection and metering?
Options
A. Wattmeters
B. Instrument transformers
C. Energy meters
D. Power factor meters

5. The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240 x 10^-6 N-m on full scale. If B = 1 Wb/m², range of meter is
Options
A. 1 mA
B. 2 mA
C. 3 mA
D. 4 mA

6. It is required to measure angular position. Out of the transducers
1. Circular potentiometer
2. LVDT
3. E pick up
4. Synchro
The proper devices are
Options
A. 1, 2, 3, 4
B. 2 and 3
C. 1, 2, 4
D. 1 and 4

7. A moving coil instrument has a resistance of 0.6 ? and full scale deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the resistance of shunt should be
Options
A. 0.6 ?
B. 0.06 ?
C. 0.1 ?
D. 0.004 ?

8. Assertion (A): De sauty's bridge is suitable only for pure capacitor.
Reason (R): Capacitors are mostly perfect.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true

9. In figure, Z₁ = 200?60� ?, Z₂ = 400? - 90� ?, Z₃ = 300?0�. Then Z₄ for bridge to be balanced is
Options
A. 150?30� ?
B. 400? - 90� ?
C. 300?90� ?
D. 600? - 150� ?

10. A moving coil instrument has a resistance of 0.5 ? and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be
Options
A. 0.004 ?
B. 0.005 ?
C. 0.05 ?
D. 0.1 ?

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