Nt1310 Unit 5
51. --------- extends the range of a moving-iron ac ammeter. C
a. A shunt
b. A multiplier
c. Changing number of turns of operating coil
d. A series
52. The most sensitive instrument is D
a. Moving-iron
b. Dynamometer
c. Hot-wire
d. Permanent-magnet moving coil
BRIDGE MEASUREMENT
53. The bridge uses the -------- measurement and operates on ------------- principle. C
a. Direct measurement and null indication
b. indirect Direct measurement and null indication
c. Comparison measurement and null indication
d. None of the above
54. A Wheatstone bridge is balanced if B
a. the ratio of resistors on one side of the bridge is one while the ratio of resistors on the other side is infinity
b. the ratio of resistors on one side of the bridge
equals the ratio of resistors on the other side
c. the ratio of resistors on one side of the bridge is greater than the ratio of resistors on the other side
d. the bridge uses identical resistors
55. Which is not the AC bridge? D
a. Maxwell bridge
b. Anderson bridge
c. Hay bridge
d. Wheatstone bridge
56. Current range extension in moving coil instruments can be achieved by placing a _______ resistance resistor in shunt with the instrument. A
a. Low
b. High
c. Medium
d. depends on the current range
57. What is the reason why the scale of a permanent-magnet moving coil instrument is uniform? C
a. Because of effective eddy current damping
b. Because external magnetic field has no effect
c. Because it is spring controlled
d. Because it has no hysteresis loss 58. In Wheatstone bridge, bridge balance is considered A
a. Where there is no current that flows through the load
b. Where there is current that flows through the load
c. Where there is potential difference between load terminal
d. Where the galvanometer reading is maximum
59. What DC bridge is widely used for the accurate measurements of resistance? D
a. Wien bridge
b. Hay bridge
c. Potentiometer bridge
d. Wheatstone bridge
60. Which of the following is a DC bridge that is very useful for making extremely accurate voltage measurements? B
a. Wheatstone bridge
b. Potentiometer bridge
c. Kelvin bridge
d. wien bridge
a. A shunt
b. A multiplier
c. Changing number of turns of operating coil
d. A series
52. The most sensitive instrument is D
a. Moving-iron
b. Dynamometer
c. Hot-wire
d. Permanent-magnet moving coil
BRIDGE MEASUREMENT
53. The bridge uses the -------- measurement and operates on ------------- principle. C
a. Direct measurement and null indication
b. indirect Direct measurement and null indication
c. Comparison measurement and null indication
d. None of the above
54. A Wheatstone bridge is balanced if B
a. the ratio of resistors on one side of the bridge is one while the ratio of resistors on the other side is infinity
b. the ratio of resistors on one side of the bridge
equals the ratio of resistors on the other side
c. the ratio of resistors on one side of the bridge is greater than the ratio of resistors on the other side
d. the bridge uses identical resistors
55. Which is not the AC bridge? D
a. Maxwell bridge
b. Anderson bridge
c. Hay bridge
d. Wheatstone bridge
56. Current range extension in moving coil instruments can be achieved by placing a _______ resistance resistor in shunt with the instrument. A
a. Low
b. High
c. Medium
d. depends on the current range
57. What is the reason why the scale of a permanent-magnet moving coil instrument is uniform? C
a. Because of effective eddy current damping
b. Because external magnetic field has no effect
c. Because it is spring controlled
d. Because it has no hysteresis loss 58. In Wheatstone bridge, bridge balance is considered A
a. Where there is no current that flows through the load
b. Where there is current that flows through the load
c. Where there is potential difference between load terminal
d. Where the galvanometer reading is maximum
59. What DC bridge is widely used for the accurate measurements of resistance? D
a. Wien bridge
b. Hay bridge
c. Potentiometer bridge
d. Wheatstone bridge
60. Which of the following is a DC bridge that is very useful for making extremely accurate voltage measurements? B
a. Wheatstone bridge
b. Potentiometer bridge
c. Kelvin bridge
d. wien bridge