ECET EEE 2011-6

1. A zener diode is operated in the

A. forward bias
B. reverse bias
C. breakdown region
D. neither in forward bias nor in reverse bias

Answer : reverse bias
Explanation:-

2. The output of two-input AND gate is a

A. only if both inputs are 1
B. Only if both inputs are 0
C. only if one input is 1 and the other is 0
D. if atleast one of the inputs are 0

Answer : only if both inputs are 1
Explanation:-

3. The device commonly used for making digital circuits are

A. mechanical switches
B. relays
C. vacuum tubes
D. semiconductor devices

Answer : semiconductor devices
Explanation:-

4. A CRO Can display

A. ac signals
B. dc signals
C. both ac and dc signals
D. time-invarient signals

Answer : time-invariant signals
Explanation:-

5. The main advantage of crystal oscillator is that the output is

A. a constant frequency
B. dc
C. 50Hz to 60Hz
D. variable frequency

Answer : a constant frequency
Explanation:-

6. The input impedance of the operational amplifier is

A. infinite
B. zero
C. very high but not infinite
D. very small

Answer : very high but not infinite
Explanation:-

7. ICs are usually made of

A. silicon
B. germanium
C. aluminum
D. silver

Answer : silicon
Explanation:-

8. The most modern method of heating used in food processing is

A. induction heating
B. resistance heating
C. dielectric heating
D. eddy curremt heating

Answer : induction heating
Explanation:-

9. which of the following is present inside the fluorescent tube?

A. Helium and oxygen
B. Argon and Neon
C. Argon and CO2
D. Mercury vapour

Answer : Argon and Neon
Explanation:-

10. The value of coefficient of adhesion will be high when rails are

A. wet
B. cleaned with sand
C. greased
D. cleaned with oil

Answer : cleaned with sand
Explanation:-