EASA module 4 Electronic Fundamentals mcq 7

The position feedback signal is
a) in phase with the input demand signal
Ans b) in anti-phase with the demand signal
c) phase advanced by 90o with respect to the input signal
*
A servo system that overshoots and oscillates is
Ans a) under damped
b) over damped
c) critically damped
*
The power supply to a torque synchro system is connected to
a) the transmitter stator
b) the transmitter rotor only
Ans c) the transmitter and receiver rotors
*
If the rotor of the receiver in a torque synchro system was prevented from aligning with the transmitter rotor, then
a) the transmitter rotor will turn to align with the receiver rotor
b) the receiver will overheat
Ans c) a high current will flow in the stator windings
*
This is a diagram of a
a) differentiator
Ans b) integrator
c) adder
*
A zener diode
Ans a) stabilizes voltage at a predetermined level
b) allows current to flow in one direction
c) acts like a switch
*
The common collector amplifier is sometimes called the emitter follower circuit because
a) the emitter current follows the collector current
Ans b) the emitter voltage follows the base voltage
c) the emitter voltage follows the collector voltage
*
In a toroidal resistance transmitter indicator system, the power supply is connected to
Ans a) the brushes
b) the resistor slab
c) the rotor
*
When a servo has reached its null and stopped, the velocity feedback is
Ans a) zero
b) maximum and anti-phase
c) maximum and in phase
*
The primary purpose of rate feedback in a positional servo system is to
a) ensure minimum response time
Ans b) prevent excessive overshoot
c) ensure system linearity
*
In an AC rate servo, a steady input will result in the servomotor
a) oscillating about a new datum
Ans b) rotating at a constant speed
c) rotating to a new datum position
*
An E&I bar output at datum has
a) no induced voltage in the secondary windings
b) an imbalance of voltages in the secondary windings
Ans c) equal and opposite voltages induced in the secondary
*
A non-inverting op-amp
a) has a non-inverting input and an inverting output
b) has an inverting input and a non-inverting output
Ans c) a non-inverting input connection only
*
Amplifiers may be classified as
a) common emitter or common collector amplifiers
b) voltage amplifiers or impedance amplifiers
Ans c) voltage amplifiers or power amplifiers
*
What is a shottky diode used for?
Ans a) Very high frequency applications
b) Stabilsation
c) Rectification
*
The result of cross connecting two of the transmission leads in a torque synchro system and the turning the rotor of the transmitter 60o clockwise would be
a) the receiver would move 60o clockwise
b) the receiver would move 120o anti-clockwise
Ans c) the receiver would move 60o anticlockwise
*
The control windings of a two phase servomotor is supplied with AC voltage of
a) constant amplitude
b) variable phase
Ans c) variable amplitude, variable phase
*
In a torque synchro that includes a differential synchro the power supply is connected to
a) the transmitter rotor only
Ans b) the transmitter and receiver rotors only
c) all three rotors
*
A differential synchro rotor has
Ans a) three windings
b) two windings
c) one winding
*
If the rotor of a control synchro sticks
a) the system hunts
Ans b) high current will flow
c) the position feedback will oscillate
*
with the reversal of the connections to the rotor of the transmitter of a torque synchro, the position of the receiver rotor will be
a) unchanged
b) changed by 120o
Ans c) changed by 180o
*
The application of a 'stick-off' voltage to a control synchro servo system is
a) to overcome the effect of static friction
b) to overcome the effect of viscous friction
Ans c) to prevent alignment to a false null
*
When removing a microprocessor
a) no damage is done by static discharge
Ans b) considerable damage can be done by static discharge
c) ensure the power is OFF to avoid static discharge
*