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Electric Drives
Electric Drives Written Test
Quiz 1
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Q.1
A 32-pole, 3-phase,Hz induction motor is operating at a speed ofrpm. The frequency of the rotor current of the motor in Hz is __________
a) 40.2
b) 46.1
c) 40.1
d) 40.6
Q.2
A 20-pole, 3-phase,Hz induction motor is operating at a speed of _______ rpm. The frequency of the rotor current of the motor in Hz is 20.
a) 418.56
b) 420.12
c) 421.23
d) 422.45
Q.3
Calculate the amplitude of the sinusoidal waveform z(t)=.27sin(.369πt+.142π÷4.25).
a) .287
b) .270
c) .216
d) .287
Q.4
R.M.S value of the sinusoidal waveform q(t)=2.11cos(87.25t+78π÷478.23).
a) 1.49 V
b) 1.56 V
c) 1.12 V
d) 1.78 V
Q.5
The no-load circuit test on a 3-Φ induction motor is conducted at a rotor speed of _______
a) Zero
b) < Ns
c) > Ns
d) Ns
Q.6
If induction motor air gap power isKW and mechanically developed power isKW, then rotor ohmic loss will be _________ KW.
a) 41
b) 42
c) 43
d) 44
Q.7
Calculate the line voltage in star connection when phase voltage=V.
a) 77.9 V
b) 77.6 V
c) 77.2 V
d) 77.8 V
Q.8
The slope of the V-I curve is 1.1°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.
a) .019 Ω
b) .036 Ω
c) .075 Ω
d) .084 Ω
Q.9
If induction motor rotor power is 157.5 KW and gross developed power is 79.9 KW, then rotor ohmic loss will be _________ KW.
a) 77.5
b) 77.6
c) 76.9
d) 77.1
Q.10
The power factor of a squirrel cage induction motor generally is ___________
a) .6-.8
b) .1-.2
c) .2-.4
d) .5-.7
Q.11
Calculate the active power in a .H inductor.
a) 1.535 W
b) 0 W
c) 2.484 W
d) 1.598 W
Q.12
Calculate the time period of the waveform i(t)=sin(πt+6π÷4)+sin(πt+5π÷6).
a) 2 sec
b) 4 sec
c) 5 sec
d) 3 sec
Q.13
Calculate the total heat dissipated in a rotor resistor of 14.Ω when .A current flows through it.
a) 6.45 W
b) 6.01 W
c) 6.78 W
d) 6.98 W
Q.14
Calculate mark to space ratio if the system is on for 4.3 sec and off for 78.2 sec.
a) .054
b) .047
c) .039
d) .018
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