This set of Audio Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Microphone Types – Moving Coil, Ribbon and Cardioid”.
1. What is the range of a very low impedance microphone?
a) 0 to 50 Ω
b) 50 to 100 Ω
c) 1000 to 1500 Ω
d) 100 to 600 Ω
View Answer
Explanation: A good microphone should have high sensitivity, high signal to noise ratio and flat frequency response over entire audible range. The range of very low impedance microphone is 0 to 50 Ω. Impedance of ribbon microphone and moving coil microphone is very low. For increasing the impedance, step up transformer is needed in the circuit.
2. What is the range of a high impedance microphone?
a) 50 to 100 Ω
b) 100 to 600 Ω
c) 750 Ω and above
d) 500 to 550 Ω
View Answer
Explanation: The range of high impedance microphone is 750 Ω and above. Impedance of crystal microphone and condenser microphone is high. Hence emitter follower amplifier is used for impedance matching. The range of medium impedance microphone is 100 to 600 Ω.
3. On which principle is the working of moving coil microphone based?
a) High impedance
b) Low impedance
c) Electromagnetic Induction
d) Medium impedance
View Answer
Explanation: Working of the moving coil microphone is based on the principle of electromagnetic induction. Pressure of sound moves a coil placed in the magnetic field and change of magnetic field change the magnetic flux passing through the coil.
4. What type of permanent magnet is used with Central pole piece and peripheral pole piece in moving coil microphone?
a) Pot
b) Ribbon
c) Cardioid
d) Crystal
View Answer
Explanation: Pot type permanent magnet is used with Central pole piece (South pole) and peripheral pole piece (North pole). This type of magnet gives the uniform magnetic field in the gap between two pole pieces.
5. In which type of microphone we can speak from a distance of half meter or 25cm?
a) Ribbon
b) Cardioid
c) Crystal
d) Moving coil / dynamic
View Answer
Explanation: In moving coil microphone we can speak from a distance of about half meter or 25cm. It does not require any external bias or power supply. Moving coil microphone is the most widely used microphone and it is used in broadcast studio.
6. Which of the following type of microphone construction is shown in the below figure?
a) Moving coil
b) Cardioid
c) Ribbon
d) Electret
View Answer
Explanation: In above figure the construction of ribbon microphone is shown. In ribbon microphone the ribbon acts as conductor as well as diaphragm. The U-shaped black part is called the magnet and inside the magnet ribbon is present.
7. Which of the following microphone is also called pressure gradient and velocity microphone?
a) Cardioid
b) Electret
c) Moving coil
d) Ribbon
View Answer
Explanation: In the ribbon microphone, the driving mechanical force is proportional to the difference of the pressure acting on two sides of the ribbon, and velocity of sound waves. Hence ribbon microphone is also called pressure gradient and velocity microphone.
8. Which of the following microphone is mostly used in dramas and concerts?
a) Electret
b) Capacitor
c) Ribbon
d) Moving coil
View Answer
Explanation: The ribbon microphone has excellent transient response and it doesn’t need external bias. Ribbon microphone is used in series with moving coil microphone to obtain cardioid pattern directivity which is useful for dramas and concerts.
9. Which of the following microphone have the directivity pattern shaped like a heart?
a) Ribbon
b) Cardioid
c) Moving coil
d) Capacitor
View Answer
Explanation: As the name suggests the ‘cardioid microphone’ its directivity pattern is roughly shaped like a heart when drawn out on an axis. This means that most of the sound it picks up comes from the front of the microphone while minimal noise is picked up from the rear and only marginal sounds are picked up from the sides.
10. Which of the following microphone is costlier than other microphones?
a) Moving coil
b) Ribbon
c) Carbon
d) Cardioid
View Answer
Explanation: Ribbon microphone is costlier than all other microphones because it has excellent transient response. The main feature of ribbon microphone is the ‘lightness’ of the ribbon, which is only 0.2 mg in weight which is less than 1 microns thick and 3mm wide. Hence it requires careful handling.
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