ELEX Pre-Board Exam 16

What is the stunt value needed to make a 50 Ω 0-1 mA meter into a 0-50 mA meter?

• 1 Ω
• 1.01 Ω
• 5.55 Ω
• 1.11 Ω

What are the two methods of expressing the Sensitivity of a meter?

• Ω/V
• full scale deflection
• full scale current
• a and c only

What do pointers or underdamped meters do?

• Oscillate above and below the value
• Move too fast to indicate value
• Move  to  the  correct  reading  rapidly  but does not overshoot
• Move  slowly  and  will  not  indicate  rapid variations adequately

What do pointers on overdamped meters do?

• Oscillate above and below the value
• Move too fast to indicate value
• Move  to  the  correct  reading  rapidly  but does not overshoot
• Move  slowly  and  will  not  indicate  rapid variations adequately

Indicate which is not a way producing damping in meters.

• shunt coil
• multiplier
• aluminum coil form
• air paddle

Which is the most sensitive meter from among the choices?

• 0-50 µA
• 0-10 mA
• 0-1 mA
• 0-100 mA

What is the Ω/V sensitivity of a 0-2 mA meter?

• 500 Ω/V
• 40 k Ω/V
• 50 Ω/V
• 5 k Ω/V

What is the Ω/V sensitivity of a 0-25 µA meter?

• 500 Ω/V
• 40 kΩ/V
• 50 Ω/V
• 5 kΩ/V

What would be the value of the multiplier used with a 50-µA movement, 300-V meter?

• 6 mΩ
• 20 kΩ
• 0.015 Ω
• none of these

If a 20 kΩ/V meter with 5 kΩ internal resistance is used in an ohmmeter with 3 V battery, what internal resistance is required in the meter to produce proper zeroing?

• 60 kΩ
• 20 kΩ
• 16.67 Ω
• none of these