Giibilisco - Measuring Devices
- 1.The attraction or repulsion between two electrically charged objects is called
- A.
Electromagnetic deflection.
- B.
Electrostatic force.
- C.
Magnetic force.
- D.
Electroscopic force.
- 2.The change in the direction of a compass needle, when a current-carrying wire is brought near, is called
- A.
Electromagnetic deflection.
- B.
Electrostatic force.
- C.
Magnetic force.
- D.
Electroscopic force.
- 3.Suppose a certain current in a galvanometer causes the compass needle to deflect by 20 degrees, and then this current is doubled while the polarity stays the same. The angle of the needle deflection will
- A.
Decrease.
- B.
Stay the same.
- C.
Increase.
- D.
Reverse direction.
- 4.One important advantage of an electrostatic meter is the fact that
- A.
It measures very small currents.
- B.
It can handle large currents.
- C.
It can detect and indicate ac voltages as well as dc voltages.
- D.
It draws a large current from a power supply.
- 5.A thermocouple
- A.
Gets warm when dc flows through it.
- B.
Is a thin, straight, special wire.
- C.
Generates dc when exposed to visible light.
- D.
Generates ac when heated.
- 6.An important advantage of an electromagnet-type meter over a permanent-magnet meter is the fact that
- A.
The electromagnet meter costs much less.
- B.
The electromagnet meter need not be aligned with the earth’s magnetic field.
- C.
The permanent-magnet meter has a more sluggish coil.
- D.
The electromagnet meter is more rugged.
- 7.Ammeter shunts are useful because
- A.
They increase meter sensitivity.
- B.
They make a meter more physically rugged.
- C.
They allow for measurement of large currents.
- D.
They prevent overheating of the meter movement.
- 8.Voltmeters should generally have
- A.
High internal resistance.
- B.
Low internal resistance.
- C.
The greatest possible sensitivity.
- D.
The ability to withstand large currents.
- 9.In order to measure the power-supply voltage that is applied to an electrical circuit, a voltmeter should be placed
- A.
In series with the circuit that works from the supply.
- B.
Between the negative pole of the supply and the circuit working from the supply.
- C.
Between the positive pole of the supply and the circuit working from the supply.
- D.
In parallel with the circuit that works from the supply.
- 10.Which of the following will not normally cause a large error in an ohmmeter reading?
- A.
A small voltage between points under test
- B.
A slight change in switchable internal resistance
- C.
A small change in the resistance to be measured
- D.
A slight error in the range switch position
- 11.
- A.
Can measure lower voltages.
- B.
Draws less current from the circuit under test.
- C.
Can withstand higher voltages safely.
- D.
Is sensitive to ac voltage as well as to dc voltage.
- 12.Which of the following is not a function of a fuse?
- A.
To ensure there is enough current available for an appliance to work right
- B.
To make it impossible to use appliances that are too large for a given circuit
- C.
To limit the amount of power that a device can draw from the electrical circuit
- D.
To make sure the current drawn by an appliance cannot exceed a certain limit
- 13.A utility meter’s motor speed depends directly on
- A.
The number of ampere-hours being used at the time.
- B.
The number of watt-hours being used at the time.
- C.
The number of watts being used at the time.
- D.
The number of kilowatt-hours being used at the time.
- 14.A utility meter’s readout indicates
- A.
Voltage.
- B.
Power.
- C.
Current.
- D.
Energy.
- 15.A typical frequency counter
- A.
Has an analog readout.
- B.
Is accurate to six digits or more.
- C.
Works by indirectly measuring current.
- D.
Works by indirectly measuring voltage.
- 16.A VU meter is never used to get a general indication of
- A.
Sound intensity.
- B.
Decibels.
- C.
Power in an audio amplifier.
- D.
Visible light intensity.
- 17.The meter movement in an illumination meter directly measures
- A.
Current.
- B.
Voltage.
- C.
Power.
- D.
Energy.
- 18.An oscilloscope cannot be used to indicate
- A.
Frequency.
- B.
Wave shape.
- C.
Energy.
- D.
Peak signal voltage.
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