Gibilisco:Chapter 3 - Measuring Devices
This is the MCQs for Gibilisco:CHAPTER 3 - MEASURING DEVICES
- 1.The force 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:
- A.
Electromagnetic deflection
- B.
Electrostatic force
- C.
Magnetic force
- D.
Electroscopic force
- 3.Suppose a certain current in a galvanometer causes the needle to deflect 20 degrees, and then this current is doubled. The needle deflection:
- A.
Will decrease
- B.
Will stay the same
- C.
Will increase
- D.
Will reverse direction
- 4.One important advantage of an electrostatic meter is that:
- A.
It measures very small currents
- B.
It will handle large currents
- C.
It can detect ac voltages
- D.
It draws a large current from the source
- 5.A thermocouple:
- A.
Gets warm when current flows through it
- B.
Is a thin, straight, special wire
- C.
Generates dc when exposed to light
- D.
Generates ac when heated
- 6.One advantage of an electromagnet meter over a permanent-magnet meter is 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.An ammeter shunt is useful because:
- A.
It increases meter sensitivity
- B.
It makes a meter more physically rugged
- C.
It allows for measurement of a wide range of currents
- D.
It prevents overheating of the meter
- 8.Voltmeters should generally have:
- A.
Large internal resistance
- B.
Low internal resistance
- C.
Maximum possible sensitivity
- D.
Ability to withstand large currents
- 9.To measure power-supply voltage being used by a circuit, a voltmeter
- A.
Is placed in series with the circuit that works from the supply
- B.
Is placed between the negative pole of the supply and the circuit working from the supply
- C.
Is placed between the positive pole of the supply and the circuit working from the supply
- D.
Is placed in parallel with the circuit that works from the supply
- 10.Which of the following will not cause a major 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 range switch selection
- 11.
![The ohmmeter in Fig. 3-17 shows a reading of about:
- ProProfs]( "The ohmmeter in Fig. 3-17 shows a reading of about:")
The ohmmeter in Fig. 3-17 shows a reading of about:- A.
33,000 Ω
- B.
3.3 KΩ
- C.
330 Ω
- D.
33 Ω
- 12.The main advantage of a FETVM over a conventional voltmeter is the fact that the FETVM:
- 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 as well as to dc
- 13.Which of the following is not a function of a fuse?
- A.
To be sure 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 circuit can deliver
- D.
To make sure the current is within safe limits
- 14.A utility meter’s motor speed works directly from:
- 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
- 15.A utility meter’s readout indicates:
- A.
Voltage
- B.
Power
- C.
Current
- D.
Energy
- 16.A typical frequency counter:
- A.
Has an analog readout
- B.
Is usually accurate to six digits or more
- C.
Works by indirectly measuring current
- D.
Works by indirectly measuring voltage
- 17.A VU meter is never used for measurement of:
- A.
Sound
- B.
Decibels
- C.
Power
- D.
Energy
- 18.The meter movement in an illumination meter measures:
- A.
Current
- B.
Voltage
- C.
Power
- D.
Energy
- 19.An oscilloscope cannot be used to indicate:
- A.
Frequency
- B.
Wave shape
- C.
Energy
- D.
Peak signal voltage
- 20.
![The display in Fig. 3-18 could be caused by a voltage of:
- ProProfs]( "The display in Fig. 3-18 could be caused by a voltage of:")
The display in Fig. 3-18 could be caused by a voltage of:- A.
6.0 V
- B.
6.6 V
- C.
7. 0V
- D.
No way to tell; the meter is malfunctioning
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