UNIT 04 - PRINCIPLES OF ELECTRICAL
AND ELECTRONIC ENGINEERING
QUESTIONS AND VERIFIED
ANSWERS|100% CORRECT|GRADE A+
Shunt Wound Advantages - ANSWER Shunt-wound motor runs at fairly constant/self-regulating
speed/torque (1) control of drill rotational speed needed for drilling (1).
OR
Series wound motor would get uncontrollably fast when no mechanical load is present (1) no mechanical
load present when drill is started before contact made with material to be drilled. (1)
Three-Phase Advantages - ANSWER Uses less copper than single-phase for transmitting current.
More efficient for driving motors.
Smaller motors for the same power.
Continuous power delivery so no pulsating at 100 Hz.
State the phase difference in degrees between any two phases of a three phase system. - ANSWER 120°
One-Phase Advantages - ANSWER Simple wiring of supply so cheaper/easier installation.
Equipment simpler to construct so cheaper appliances.
Low power, low voltage equipment easier to produce from single phase
Op-Amps - ANSWER High(Inf) Open Loop Gain
High(Inf) Input Impedance
Low(Zero) Output Impedance
Low(Zero) Voltage Offset
Series-Wound Advantages - ANSWER Valid comment about torque or turning force.
Valid comment about conditions e.g. starting from rest/low speed
AND ELECTRONIC ENGINEERING
QUESTIONS AND VERIFIED
ANSWERS|100% CORRECT|GRADE A+
Shunt Wound Advantages - ANSWER Shunt-wound motor runs at fairly constant/self-regulating
speed/torque (1) control of drill rotational speed needed for drilling (1).
OR
Series wound motor would get uncontrollably fast when no mechanical load is present (1) no mechanical
load present when drill is started before contact made with material to be drilled. (1)
Three-Phase Advantages - ANSWER Uses less copper than single-phase for transmitting current.
More efficient for driving motors.
Smaller motors for the same power.
Continuous power delivery so no pulsating at 100 Hz.
State the phase difference in degrees between any two phases of a three phase system. - ANSWER 120°
One-Phase Advantages - ANSWER Simple wiring of supply so cheaper/easier installation.
Equipment simpler to construct so cheaper appliances.
Low power, low voltage equipment easier to produce from single phase
Op-Amps - ANSWER High(Inf) Open Loop Gain
High(Inf) Input Impedance
Low(Zero) Output Impedance
Low(Zero) Voltage Offset
Series-Wound Advantages - ANSWER Valid comment about torque or turning force.
Valid comment about conditions e.g. starting from rest/low speed
