## Exam-GK-MCQ-Questions.Com

Home - Electronics - Alternating Current And Voltage

# Alternating Current And Voltage Online Exam Quiz

Important questions about Alternating Current And Voltage. Alternating Current And Voltage MCQ questions with answers. Alternating Current And Voltage exam questions and answers for students and interviews.

### 1. In both induction and synchronous ac motors

Options

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

Options

A : 100 Hz

B : 4 kHz

C : 4 Hz

D : 1.6 kHz

Options

A : +5.64 V

B : ?5.64 V

C : +26.13 V

D : ?26.13 V

Options

A : Point A

B : Point B

C : Point C

D : Point D

### 5. What type of waveform is shown in the given circuit?

Options

A : Sine wave

B : Square wave

C : Triangle wave

D : Sawtooth wave

Options

A : 2 V

B : 4 V

C : 6 V

D : 8 V

Options

A : 1.2 V

B : 5 V

C : 7 V

D : 12 V

### 3. A single-phase induction motor

Options

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

Options

A : 2 V

B : 4 V

C : 6 V

D : 8 V

Options

A : 26 V

B : 30 V

C : 40 V

D : 45 V

Options

A : 8.33%

B : 0%

C : 33.33%

D : 25%

Options

A : 13.33 V

B : 8.48 V

C : 18.84 V

D : 7.64 V

### 8. The effective value of a sine wave is equal to

Options

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

### 9. Most practical alternators generate electricity from

Options

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

Options

A : 5 V/ms

B : 2.5 V/ms

C : 2.5 V/s

D : 5 V/s