Explanation: The op-amp sometimes cannot be nullified because the output is very sensitive to even slight variation in wiper position of D’Arsonaval meter movement (ammeter with a full scale deflection of 1mA). 5. What is the maximum input voltage that has to be selected to calibrate a dc voltmeter with a full scale voltage range of 1-13v.
A. ≤ ±14v
B. ≥ ±13v
C. ≤ ±15v
D. = ±14v
Answer:A
Explanation: The op-amp sometimes cannot be nullified because the output is very sensitive to even slight variation in wiper position of D’Arsonaval meter movement (ammeter with a full scale deflection of 1mA). 5. What is the maximum input voltage that has to be selected to calibrate a dc voltmeter with a full scale voltage range of 1-13v.
A. ≤ ±14v B. ≥ ±13v C. ≤ ±15v D. = ±14v
Explanation: The maximum input voltage has to be ≤ ±14v, to obtain the maximum full scale input voltage of 13v. 6. Higher input voltage can be measured in low voltage DC voltmeter using