A 26 V
B 30 V
C 40 V
D 45 V

A 8.33%
B 0%
C 33.33%
D 25%

# Q3: Most practical alternators generate electricity from

A a coil rotating within a magnetic field
B a magnetic field rotating around fixed windings
C a permanent magnet rotating within a varying electromagnetic field
D none of the above

# Q4: A single-phase induction motor

A is self-starting
B operates at a fixed speed
C is less reliable than a three-phase synchronous motor
D none of the above

A Point A
B Point B
C Point C
D Point D

A 1.2 V
B 5 V
C 7 V
D 12 V

A Sine wave
B Square wave
C Triangle wave
D Sawtooth wave

A 2 V
B 4 V
C 6 V
D 8 V

A 5 V/ms
B 2.5 V/ms
C 2.5 V/s
D 5 V/s

A +5.64 V
B –5.64 V
C +26.13 V
D –26.13 V

A 2 V
B 4 V
C 6 V
D 8 V

A 100 Hz
B 4 kHz
C 4 Hz
D 1.6 kHz

A 13.33 V
B 8.48 V
C 18.84 V
D 7.64 V

# Q14: The effective value of a sine wave is equal to

A 0.707 of peak voltage
B 0.636 of peak voltage
C sin 45° of peak voltage
D both 0.707 of peak voltage and sin 45° of peak voltage

# Q15: In both induction and synchronous ac motors

A the operating speed is very steady
B the stator magnetic field is stationary
C the stator magnetic field rotates
D the "squirrel cage" forms the rotor

A 8.33%
B 0%
C 33.33%
D 25%

# Q17: A rectangular wave that has a duty cycle of 50% could be called a

A "c" wave
B sawtooth wave
C square wave
D triangular wave

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