EASA module 4 Electronic Fundamentals mcq 9

A zener diode is used for
a) rectification
Ans b) voltage stabilization
c) modulation
*
A multi-layer PCB has
Ans a) one layer on either side
b) two or more layers on one or both sides
c) two or more layers connected in series
*
When a servomotor overshoots after a step input and oscillates it is
a) over damped
Ans b) under damped
c) critically damped
*
The rotor of a desynn indicator is
a) an electromagnet
Ans b) a permanent magnet
c) an AC magnet
*
The position feedback from a potentiometer is
Ans a) anti-phase
b) in phase
c) 90 degrees out of phase
*
A differential synchro has
Ans a) 3 phase stator, 3 phase rotor
b) single phase stator, 2 phase rotor
c) 3 phase stator, single phase rotor
*
When a servomotor has stopped, the rate feedback from a tachogenerator is
Ans a) zero
b) maximum and in phase
c) maximum and anti-phase
*
A tachogenerator is usually used for
Ans a) rate feedback
b) angular feedback
c) position feedback
*
What is this circuit?
Ans a) Half wave rectifier
b) Full wave rectifier
c) Flywheel diode
*
Differential synchros have
a) a transmitter only
b) a receiver only
Ans c) a transmitter and a receiver
*
In an integrated circuit, the components are mounted
a) by means of wires connecting them
Ans b) by metal oxide film
c) by metal screws
*
This symbol is
Ans a) a diode
b) a triac
c) a transistor
*
One characteristic of the emitter follower is
Ans a) low resistance output
b) low current amplification
c) high voltage amplification

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