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Viva EDC Cycle 1

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

The cut-in voltage of a silicon diode is approximately:

a)

0.3 V

b)

0.5 V

c)

0.7 V

d)

1.2 V

2.

In forward bias, current through a PN junction diode is:

a)

Negligible

b)

Very high

c)

Zero

d)

Constant

3.

The VI characteristic of a diode in reverse bias shows:

a)

Large current

b)

Small leakage current

c)

Zero current

d)

Oscillations

4.

Which diode emits light when forward biased?

a)

Zener

b)

LED

c)

Schottky

d)

Tunnel

5.

The color of LED depends on:

a)

Applied voltage

b)

Bandgap of semiconductor

c)

Current rating

d)

Packaging

6.

In CB configuration, input is applied between:

a)

Base-Collector

b)

Collector-Emitter

c)

Emitter-Base

d)

Base-Emitter

7.

Current gain (α) in CB mode is given by:

a)

IC / IB

b)

IC / IE

c)

IE / IC

d)

IB / IC

8.

Typical value of α is:

a)

>1

b)

0.1-0.3

c)

0.5-0.6

d)

0.9-0.99

9.

Input characteristics of CB transistor resemble:

a)

Diode in forward bias

b)

Diode in reverse bias

c)

Resistor

d)

Zener diode

10.

CB configuration has:

a)

High Rin, High Rout

b)

Low Rin, High Rout

c)

High Rin, Low Rout

d)

Low Rin, Low Rout

11.

The midband gain of CE amplifier is generally:

a)

Flat

b)

Rising

c)

Falling

d)

Zero

12.

The low-frequency cutoff is due to:

a)

Coupling & bypass capacitors

b)

Parasitic capacitances

c)

Transistor β

d)

Power supply

13.

The high-frequency cutoff is mainly due to:

a)

Coupling capacitor

b)

Bypass capacitor

c)

Junction capacitances

d)

Resistors

14.

Bandwidth is defined between:

a)

0 Hz to ∞

b)

Frequencies at -3 dB points

c)

DC to AC

d)

None

15.

Gain-bandwidth product of a transistor amplifier is:

a)

Constant

b)

Zero

c)

Variable

d)

Infinite

16.

The input resistance of JFET is:

a)

Low

b)

Medium

c)

Very high

d)

Zero

17.

Drain current in JFET is controlled by:

a)

Gate current

b)

VGS

c)

VDS

d)

Temperature

18.

When VGS = 0, ID = ?

a)

Zero

b)

IDSS

c)

Infinite

d)

None

19.

Pinch-off voltage (Vp) means:

a)

ID = 0

b)

ID = IDSS

c)

VGS = 0

d)

gm = 0

20.

The transfer characteristic of JFET is:

a)

ID = gm × VGS

b)

ID = α × VGS

c)

ID = IDSS(1 - VGS/Vp)²

d)

ID = β × VDS

21.

MOSFET is a:

a)

Current-controlled device

b)

Voltage-controlled device

c)

Power device

d)

None

22.

In depletion MOSFET, channel exists:

a)

Only when VGS applied

b)

Only at breakdown

c)

Even without gate bias

d)

None

23.

In enhancement MOSFET, channel forms when:

a)

VGS > Vth

b)

VDS applied > ID

c)

Temperature increases

d)

None

24.

Threshold voltage is:

a)

Minimum VGS to form channel

b)

Maximum VDS allowed

c)

Minimum ID

d)

None

25.

MOSFET transconductance (gm) is defined as:

a)

dID/dVGS

b)

dVDS/dID

c)

dID/dVDS

d)

dVGS/dID

26.

Voltage gain of inverting amplifier =

a)

1 + (Rf/Rin)

b)

-Rf/Rin

c)

Rin/Rf

d)

Rf × Rin

27.

Voltage gain of non-inverting amplifier =

a)

Rin/Rf

b)

1 + (Rf/Rin)

c)

-Rf/Rin

d)

None

28.

In inverting amplifier, phase shift is:

a)

0°

b)

90°

c)

180°

d)

360°

29.

Input of non-inverting amplifier is given to:

a)

Inverting terminal

b)

Non-inverting terminal

c)

Both terminals

d)

None

30.

The input resistance of a non-inverting amplifier is:

a)

Very low

b)

Equal to Rin

c)

Very high

d)

Zero

31.

A clipper circuit is used to:

a)

Amplify signals

b)

Remove a portion of waveform

c)

Store energy

d)

Convert AC to DC

32.

Positive clipper removes:

a)

Positive half

b)

Negative half

c)

Both halves

d)

Noise

33.

Negative clipper removes:

a)

Positive half

b)

Negative half

c)

Both halves

d)

None

34.

Biased clipper clips:

a)

Only at zero

b)

At desired reference voltage

c)

Both halves

d)

None

35.

Main component used in clippers is:

a)

Inductor

b)

Capacitor

c)

Diode

d)

Resistor

36.

A full-wave rectifier converts:

a)

AC to DC (both halves)

b)

Only half cycle

c)

DC to AC

d)

None

37.

Efficiency of a full-wave rectifier is:

a)

40.6%

b)

50%

c)

81%

d)

100%

38.

Ripple frequency for 50 Hz input =

a)

25 Hz

b)

50 Hz

c)

100 Hz

d)

200 Hz

39.

PIV of each diode in full-wave rectifier =

a)

Vm

b)

2Vm

c)

Vm/2

d)

None

40.

Advantage of full-wave rectifier over half-wave is:

a)

Less efficiency

b)

Higher PIV stress

c)

Smoother DC output

d)

None

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