Question Papers For Board Examinations 2018

Class – XII

Subject – Troubleshooting And Maintenance of Electronic Equipments

Subject : Troubleshooting And Maintenance of Electronic Equipments

Class : XII

Year : 2018

General Instructions :

Attempt any fourteen questions. Each question carries one mark. Select the correct answer. 

Questions :

SECTION A

1. In an electrical plug, the ‘earth’ pin in comparison to other pins, is
(1) equal
(2) smaller
(3) larger
(4) thinner

2. A multimeter is used to check
(1) Voltage
(2) Current
(3) Resistance
(4) All of the above
 
3. The resistance of a p-n junction diode in forward and reverse bias is respectively
(1) low and high
(2) high and low
(3) equal
(4) infinite and zero

4. Which microphone has a built-in amplifier ?
(1) Capacitance
(2) Moving coil
(3) Piezoelectric
(4) Carbon

5. In a carbon microphone, sound is converted into electrical signals by a change in
(1) Resistance
(2) Capacitance
(3) Inductance
(4) Coil movement

6. A moving coil loudspeaker converts
(1) Magnetic energy into electrical signals
(2) Electrical signals to sound
(3) Air pressure to electrical signals
(4) None of the above

7. Which loudspeaker is used for low frequencies ?
(1) Woofer
(2) Tweeter
(3) Squawker
(4) Horn type

8. What type of current is passed through the ‘Record Head’ in magnetic recording ?
(1) D.C.
(2) R.F.
(3) Audio signals
(4) 1 kHz A.C.   

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Courtesy: CBSE