A:-Enlarging small electronic signals
B:-Switching purposes
C:-Reducing electronic signals
D:-Both the purposes mentioned in (1) and (2)
Correct Answer:- Option-A
Question68:-A transistor can be thought of as two PN junction diodes connected as

Correct Answer:- Option-B
Question69:-The advantage of transistors over vacuum tubes is
A:-Very small size
B:-Minimum power loss in the form of heat
C:-Low operating voltage
D:-All the three, mentioned above
Correct Answer:- Option-D
Question70:-NPN transistors are preferred to PNP transistors for
A:-Higher switching speed
B:-Easy use in +ve supply rail
C:-A wide range of operating temperature
D:-The reasons mentioned in (1) and (2)
Correct Answer:- Option-A
Question71:-Small signal amplifiers are also known as
A:-Large power amplifiers
B:-Medium power amplifiers
C:-Low power amplifiers
D:-Both medium power and low power amplifiers
Correct Answer:- Option-C
Question72:-In transistors, the width of the collector layer is
A:-Much less than the base region
B:-Much wider than the base region
C:-Much less than the emitter region
D:-Same as that of the base region
Correct Answer:- Option-B
Question73:-The resistance measured by a multimeter between the anode and the cathode of good SCR should be

A:-Low
B:-Medium
C:-High
D:-Infinity
Correct Answer:- Option-D
Question74:-In speed control circuits for DC motors using two SCR's
A:-Each SCR conducts at any time
B:-One SCR conducts in positive half cycle and the other in negative half cycle
C:-Both SCR's conduct at a time
D:-Only one SCR conducts and the other does not conduct
Correct Answer:- Option-B
Question75:-Most common application of UT is
A:-Schmitt trigger
B:-Bistable multivibrator
:-Relaxation oscillator
D:-Timer
Correct Answer:- Option-C
Question76:-DIAC is basically
A:-A PNP/NPN transistor
B:-A PNP/NPN transistor with no base connection
C:-A 4 layered NPNP device
D:-None of the above