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
View Answer
Explanation: Transistor–transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. However, resistors have a small role to play and both logic gating and amplifying functions are performed by the transistors.
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
View Answer
Explanation: TTL is called transistor–transistor logic because both the logic gating function and the amplifying function are performed by bipolar junction transistors (BJTs).
3. TTL was invented in 1961 by ____________
a) Baker clamp
b) James L. Buie
c) Chris Brown
d) Frank Wanlass
View Answer
Explanation: TTL was invented in 1961 by James L Buie.
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
View Answer
Explanation: The full form of TCTL is transistor-coupled transistor logic.
5. The _______ ancestor to the first personal computers.
a) PARAM 1
b) SATYAM 1
c) KENBAK 1
d) MITS Altair
View Answer
Explanation: The KENBAK 1, ancestor to the first personal computers.
6. TTL inputs are the emitters of a ____________
a) Transistor-transistor logic
b) Multiple-emitter transistor
c) Resistor-transistor logic
d) Diode-transistor logic
View Answer
Explanation: TTL inputs are the emitters of a multiple-emitter transistor.
7. TTL is a ____________
a) Current sinking
b) Current sourcing
c) Voltage sinking
d) Voltage sourcing
View Answer
Explanation: Like DTL, TTL is a current-sinking logic since a current must be drawn from inputs to bring them to a logic 0 level. Current Sink means it accepts current coming out from a source.
8. Standard TTL circuits operate with a __ volt power supply.
a) 2
b) 4
c) 5
d) 3
View Answer
Explanation: Standard TTL circuits operate with a 5-volt power supply.
9. TTL devices consume substantially ______ power than equivalent CMOS devices at rest.
a) Less
b) More
c) Equal
d) Very High
View Answer
Explanation: TTL devices consume substantially more power than equivalent CMOS devices at rest. Thus, CMOS devices are faster than TTL devices.
10. A TTL gate may operate inadvertently as an ____________
a) Digital amplifier
b) Analog amplifier
c) Inverter
d) Regulator
View Answer
Explanation: A TTL gate may operate inadvertently as an analog amplifier if the input is connected to a slowly changing input signal that traverses the unspecified region from 0.7V to 3.3V.
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
View Answer
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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