WorksheetsF023 TAv07 - the lot
Total questions: 16
Worksheet time: 8mins
An Alternator is what type of electrical machine
AC Generator
DC Generator
AC Motor
DC Motor
DC Transformer
____ is the stationary part of the motor, and the rotor is the rotating part of the motor
STATOR.
ROTOR
AC MOTOR
CYLINDER
The starting torque of a squirrel-cage induction motor is
Full-load torque
Slightly more than full-load torque
Low
Negligible
Which of the graphs below shows the characteristics for the circuit shown?
Which of these circuit symbols represents a high pass filter
if there was a short to earth between the generator and the load, how would the fault control unit detect the issue?
the fault control unit would sense a voltage drop over the resistor.
both inputs to the fault control unit would be high
both inputs to the fault control unit would be low
the rise in I2 current would be detected in the top input to the fault control unit
the drop in I1 current would be detected in the bottom input to the fault control unit
If the T=0.85 for a transformer, what type of transformer would it be?
Step up Transformer
Step down Transformer
Unity
on the graph showing a sinusoidal wave, what is being represented by the letter a?
Vp-p
Vp
Vmean
Vrms
If a sine wave has a period time of 20ms what would its frequency be?
50Hz
400Hz
100Hz
20KHz
Which of the following graphs represents an AC voltage superimposed on a DC voltage?
Which of the following components are used to extract the current from the armature on a rotating armature AC Generator.
Slip rings
Brushes
Commutator
Field Winding
Pole shoe
Which of of the following graph represents the output of the circuit shown?
2πfC1 is used to calculate...
(a)
which of these formula is used to calculate resonant frequency?
f0=2π LC1
f0=2π LC1
f0=2π XLXR1
f0=2π ZR1
In a series LCR circuit, what is used as the reference in a phasor diagram?
Is
Vs
P
VL
Ic
If XC<XL then Voltage would lead Current in the circuit.
True or False
True
False
