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# Alternating Voltage and Current Online Exam Quiz

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

### Which, among the following, is the correct expression for alternating emf generated?

Options

A : a. e=2Blvsin(?)

B : b. e=2B²lvsin(?)

C : c. e=Blvsin(?)

D : d. e=4Blvsin(?)

Options

A : a. 0°

B : b. 90°

C : c. 180°

D : d. 45°

Options

A : a. 150V

B : b. 100V

C : c. 300V

D : d. 0V

### When a coil is rotated in a magnetic field, the emf induced in it?

Options

A : a. Is maximum

B : b. Is minimum

C : c. Continuously varies

D : d. Remains constant

Options

A : a. 0°

B : b. 90°

C : c. 270°

D : d. 45°

### In an A.C. generator, increase in number of turns in the coil _________

Options

A : a. Increases emf

B : b. Decreases emf

C : c. Makes the emf zero

D : d. Maintains the emf at a constant value

Options

A : a. Waveform

B : b. Frequency

C : c. Amplitude

D : d. Period

### The variation of a quantity such as voltage or current shown on a graph is known as ___________

Options

A : a. Waveform

B : b. Peak value

C : c. Instantaneous value

D : d. Period

### What is the duration of one cycle known as _________

Options

A : a. Waveform

B : b. Peak value

C : c. Instantaneous value

D : d. Period

### The repetition of a variable quantity, recurring at equal intervals, is known as ___________

Options

A : a. Waveform

B : b. Instantaneous value

C : c. Cycle

D : d. Period

### The value of a given waveform at any instant time is termed as ___________

Options

A : a. Waveform

B : b. Instantaneous value

C : c. Cycle

D : d. Period

### The maximum instantaneous value measured from zero value is known as?

Options

A : a. Peak value

B : b. Peak to peak value

C : c. Cycle

D : d. Period

### The maximum variation between the maximum positive and the maximum negative value is known as?

Options

A : a. Peak value

B : b. Peak to peak value

C : c. Cycle

D : d. Period

Options

A : a. Vp=4Vp-p

B : b. Vp=Vp-p

C : c. Vp-p=2Vp

D : d. Vp=2Vp-p

Options

A : a. 10V

B : b. 2V

C : c. 4V

D : d. 5V

Options

A : a. 9V

B : b. 20V

C : c. 18V

D : d. 12V

### The waveform of the emf generated undergoes one complete cycle when?

Options

A : a. Conductors move past north pole

B : b. Conductors move past south pole

C : c. Conductors move past north and south poles

D : d. Conductors are stationary

### When is the shape of the negative half of the emf waveform equal to the positive half?

Options

A : a. When the conductors move past north pole

B : b. When conductors move past south pole

C : c. When conductors move past both north and south pole

D : d. When conductors are stationary

Options

A : a. f=p*n

B : b. f=p/n

C : c. f=n/p

D : d. f=n²p

### What will happen to the frequency if the number of revolutions increases?

Options

A : a. Increases

B : b. Decreases

C : c. Remains the same

D : d. Becomes zero