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Electric Drives
Tricky Electric Drives
Quiz 1
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Q.1
What is the formula for the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, δ represents rotor angle, X represents reactance)
a) Eb×Vt×sinδ÷X
b) Eb×Vt2×sinδ÷X
c) Eb2×Vt×sinδ÷X
d) Eb×Vt×sinδ÷X2
Q.2
Salient pole machines are more stable than cylindrical rotor machines.
a) True
b) False
Q.3
The unit of reactive power is VAR.
a) True
b) False
Q.4
Calculate the power factor during the resonance condition.
a) .58
b) .42
c) .65
d) 1
Q.5
Calculate the reactive power in a 5 Ω resistor.
a) 7 VAR
b) 0 VAR
c) 2 VAR
d) 1 VAR
Q.6
What is the unit of the apparent or complex power?
a) VAR
b) VA
c) ohm
d) Volt
Q.7
Calculate the value of the frequency of the DC supply.
a) 0 Hz
b) 50 Hz
c) 20 Hz
d) 10 Hz
Q.8
The slope of the V-I curve is 0°. Calculate the value of resistance. The graph is parallel to the x-axis.
a) 1 Ω
b) 1.8 Ω
c) 0 Ω
d) 2.2 Ω
Q.9
Calculate the value of the duty cycle if the system is on for 5 sec and off forsec.
a) .333
b) .444
c) .201
d) .642
0 h : 0 m : 1 s
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