ECET EEE 2010-4

1. In a semiconductor, the movement of holes is due to

A) Movement of holes in the conduction band
B) Movement of electrons in the conduction
C) Movement of electrons in the valance bond
D) Movement of holes in valance band

Answer : Movement of holes in the conduction band
Explanation:-

2. In a PNP transistor the saturation current is due to the flow of

A) electrons flow collector to base
B) holes from collector to base
C) electrons from emitter to base
D) holes from emitter to base

Answer : electrons flow collector to base
Explanation:-

3. An n-type FET is never operated with positive gate voltage S with respect to the source because

A) Gate to Source current is to be avoided
B) Drain current does not increase
C) Drain current does not remain constant
D) Drain current becomes very high

Answer : Gate to Source current is to be avoided
Explanation:-

4. The gain of an amplifier will be more affected by change in transistor parameters in case of

A) Positive feedback
B) Negative feedback
C) Zero feedback
D) Both A and B

Answer : Negative feedback
Explanation:-

5. A Hartely oscillator uses

A) A tapped Inductor
B) A tapped capacitor
C) both the above
D) An inductor

Answer : A tapped Inductor
Explanation:-

6. A modulator is a system to

A) seperate two frequencies
B) impress the information onto a radio frequency carrier
C) Extract information from the carrier
D) Amplify the Audio frequency signal

Answer : impress the information onto a radio frequency carrier
Explanation:-

7. In a transmission of signals the frequency which is not transmitted is

A) Upper side frequency
B) Lower side frequency
C) Audio frequency
D) Carrier frequency

Answer : Audio frequency
Explanation:-

8. A switch tail ring counter is made by using a single D-flipflop : the resulting circuit is a

A) SR Flipflop
B) JK Flipflop
C) D Flipflop
D) T Flipflop

Answer : T Flipflop
Explanation:-

9. The output of a logic gate is 1 when All its inputs are at logic 0 the Gate is either

A) A NAND or an EX-OR
B) A NOR or an EX-NOR
C) A OR or an EX-NOR
D) A AND or an EX-OR

Answer : A NOR or an EX-NOR
Explanation:-

10. The binary code of (21.125)10 is

A) 10101.001
B) 10100.001
C) 10101.010
D) 10100.111

Answer : 10101.001
Explanation:-