Digital Circuits Questions and Answers – Transistor Transistor Logic(TTL)

This set of Digital Electronics/Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Digital Circuits Questions and Answers – Transistor Transistor Logic(TTL or T²L)”.

1. Transistor–transistor logic (TTL) is a class of digital circuits built from ____________
a) JFET only
b) Bipolar junction transistors (BJT)
c) Resistors
d) Bipolar junction transistors (BJT) and resistors

2. TTL is called transistor–transistor logic because both the logic gating function and the amplifying function are performed by ____________

a) Resistors
b) Bipolar junction transistors
c) One transistor
d) Resistors and transistors respectively

3. TTL was invented in 1961 by ____________
a) Baker clamp
b) James L. Buie
c) Chris Brown
d) Frank Wanlass

4. The full form of TCTL is ____________
a) Transistor-coupled transistor logic
b) Transistor-capacitor transistor logic
c) Transistor-complemented transistor logic
d) Transistor-complementary transistor logic

5. The _______ ancestor to the first personal computers.
a) PARAM 1
b) SATYAM 1
c) KENBAK 1
d) MITS Altair

6. TTL inputs are the emitters of a ____________
a) Transistor-transistor logic
b) Multiple-emitter transistor
c) Resistor-transistor logic
d) Diode-transistor logic

7. TTL is a ____________
a) Current sinking
b) Current sourcing
c) Voltage sinking
d) Voltage sourcing

8. Standard TTL circuits operate with a __ volt power supply.
a) 2
b) 4
c) 5
d) 3

9. TTL devices consume substantially ______ power than equivalent CMOS devices at rest.
a) Less
b) More
c) Equal
d) Very High

10. A TTL gate may operate inadvertently as an ____________
a) Digital amplifier
b) Analog amplifier
c) Inverter
d) Regulator

11. The speed of ______ circuits is limited by the tendency of common emitter circuits to go into saturation.
a) TTL
b) ECL
c) RTL
d) DTL

Answer: a
Explanation: The speed of TTL circuits is limited by the tendency of common emitter circuits to go into saturation due to the injection of minority carriers into the collector region. Hence, it functions slowly compared to CMOS devices.

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