Diode Transistor Logic Question & Answers August 26, 2022 By WatElectronics This article lists 75 DTL MCQs for engineering students. All the DTL Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of DTL. Digital logic circuits such as Transistor-Transistor type Logic have multiple subclasses such as RTL- Resistor Transistor Logic, DTL-Diode Transistor Logic, and BJT. These circuits are designed using logic gates such as AND, NOR, NOT, OR, and XOR. DTL digital logic circuit is designed with logic circuits holding diodes on the source side and transistors on the load side of the circuit. Logic AND gate are mainly used in this circuit. The purpose of DTL circuits is to design and fabricate digital circuits. They can be designed using a number of input logic gates such as two input DTL holding 2 NAND type of logic gate in its circuit and a transistor. The increased fan-in is the advantage of DTL over the earlier resistor-transistor logic. The disadvantage of DTL includes high input voltage, and expensive. 1). Diode Transistor Logic is also called _____Logic? Transistor-Transistor logic Transistor-Diode logic Resistor-Transistor logic Both a and b None Hint 2). What is the Propagation Delay of DTL ______? Low Large Zero None of the above None Hint 3). Basic two input DTL contains ____ type of logic gate? AND NAND NOR OR None Hint Read more about NAND Gate 4). Which of the following is enhanced on Diode Transistor Logic? Noise margin Fan out Fan In Both a and b None Hint 5). DTL provides enhanced features over _____ design logic? RTL TTL RDTL All the above None Hint 6). DTL has ___operational speed? High Low Zero Constant None Hint 7). When the transistor is in saturation and all inputs are logic high, then the charge is stored in the___ region of transistor? Base Collector Emitter All the above None Hint 8). Why Diode–transistor logic (DTL) is called the direct ancestor of TTL? Diode network Amplifying function Truncation Both a and b None Hint 9). Which of the following is the first stage of DTL circuit shown in the following figure? Circuit D1, D2 and R1 R3 and R4 Q1 and R2 R1 and R2 None Hint 10). Which of the following is the intermediate stage of DTL circuit shown in the following figure? Circuit D1, D2 and R1 R3 and R4 Q1 and R2 R1 and R2 None Hint 11). Which of the following is the output stage of DTL circuit shown in the following figure? Circuit D1, D2 and R1 R3 and R4 Q1 and R2 R1 and R2 None Hint 12). Which of the following is the additional component attached to DTL for increasing DTL speed? Resistor Capacitor Inductor Both a and b None Hint 13). The capacitor in DTL circuit helps to turn on ____ component? Resistor Capacitor Transistor Both a and b None Hint Read more about Transistor Biasing 14). Which of the following is enhanced to turn on the transistor via capacitor? Initial base drive Emitter Collector All the above None Hint Read more about Capacitor. 15). Which of the following is used to turn off the transistor in DTL? Removing the stored base charge Adding the stored base charge Adding a capacitor None of the above None Hint 16). Which of the following is the additional way of increasing the speed of DTL? Avoid saturating the switching transistor Allowing saturating the switching transistor Allow active region None of the above None Hint 17). Which of the following is used to avoid saturation of the switching transistor? Baker clamp Clipper Chopper None of the above None Hint 18). Which of the following diode in DTL assists in preventing the transistor entering saturating? PN Zenor Schottky All the above None Hint Read more about Schottky diode 19).Which of the following type of transistor is used in DTL circuits in order to improve the switching speed of other saturated logic designs? PN Zenor Schottky All the above None Hint 20). Which of the following components are used to increase fan-out and may be used in DTL circuit? Capacitor Diode Transistor Both b and c None Hint DTL MCQs for Interviews 21). Which of the following is the advantage of DTL over the earlier resistor-transistor logic? High fan in High fan out Low resistance All the above None Hint 22). DTL is ___ type of circuit? Digital Analogue Both a and b Mechanic None Hint 23). Which of the following is the output component of DTL circuit? Diodes Transistors Resistor All the above None Hint 24). How many diodes does a 2 input DTL based NAND gate comprises of? 1 2 3 4 None Hint 25). How many number transistors does a 2 input DTL based NAND gate comprises of? 1 2 3 4 None Hint 26). In a 2-input DTL when input is low, the diodes are ____ biased? Forward Reverse Both a and b Zero None Hint 27). When 2 inputs in a 2input DTL is low, then the output is ___? High Low Zero None of the above None Hint 28). Which of the following are the benefits of DTL over RTL? Enhanced noise margin Minimum fan in Low propagation delay All the above None Hint 29). Which of the following are TTL logics? BJT RTL DTL All the above None Hint 30). RTL is also called? TRL RLT RRT None of the above None Hint DTL MCQs for Quiz 31). Which of the following is the value of maximum voltage value of a transistor in DTL? 1.3V 1.4V 1.5V Both a and b None Hint 32). If the voltage of the transistor is under the minimum required operating transistor voltage then the component ____? Operates Does not operates Breaks down All the above None Hint 33). A DTL with NOR gate has ____ components in the circuit? DRL OR gate Transistor Inverter All the above None Hint 34). Which of the following disadvantage of DTL? Moderate speed More cost High input voltage Both b and c None Hint 35). A diode is __ terminal device? 1 2 4 5 None Hint 36). Which of the following are the universal logic gates? AND NAND NOR Both b and c None Hint 37). Which of the following are the basic logic gates? AND OR NOT All the above None Hint Read more about NOR Gate. 38). Which of the following is the output of NAND gate when inputs are (00)? 1 0 X None of the above None Hint 39). Which of the following is the output of NAND gate when inputs are (10)? 1 0 X None of the above None Hint 40). Which of the following is the output of NAND gate when inputs are (01)? 1 0 X None of the above None Hint 41). Which of the following is the output of NAND gate when inputs are (11)? 1 0 X None of the above None Hint 42). Transistor Transistor Logic is also represented as? TTL T2L TL2 Both a and b None Hint 43). Which of the following is the diode? Diode Symbol PN diode Zenor diode Schottky diode PIN diode None Hint 44). A TTL circuit logic is a ____ logic? Saturating Non-saturating Cut off None of the above None Hint 45). Which of the following are NAND Gate ICs? IC7420 IC7430 IC7400 Both a and b None Hint 46). How many pins does 7400 IC has? 8 12 14 16 None Hint 47). Which of the following pin in 7400 has GND? Pin 5 Pin 7 Pin 12 Pin 14 None Hint 48). Which of the following pin in 7400 has Vcc? Pin 5 Pin 7 Pin 12 Pin 14 None Hint 49). TTL is built from ___? BJT Diodes UJT All the above None Hint 50). Which of the following are the functions of TTL? Logic function Amplification function Modulating function Both a and b None Hint 51). Abbreviate IC? Integrated Circuit Intellect Circuit Intel Circuit Both b and c None Hint 52). RTL stands for? Resistor Transistor Logic Real Transistor Logic Resistor Time Logic None of the above None Hint 53). Which of the following portion of transistor in a DTL amplifies the signal? Common emitter Common Base Common Collector Base Emitter None Hint 54). Abbreviate CTDL? Complemented Transistor Diode Logic Complemented Trunk Diode Logic Complemented Transistor Dual Logic None of the above None Hint 55). CDTL avoids ____ operation? Level shifting Phase equivalence Infinite resistance All the above None Hint 56). Which of the following are used for averting level shifting in CTDL? NPN PNP NNP Both a and b None Hint 57). A digital type clock has ____ type of transistors? Continuous Discrete Linear All the above None Hint 58). A digital clock has ___ components? Transistors Diodes Resistors All the above None Hint 59). The purpose of baker clamp type circuit is to? Minimizing emitter-collector voltage based difference Diverts base type current via collector Zero base current Both a and b None Hint 60). Baker clamp circuit induces ___ type of negative feedback into Common emitter stage of BJT? Non linear Linear Zero None of the above None Hint DTL MCQs for Students 61). A baker clamp circuit acts as __ type of circuit for minimizing the gain? Shunt regulator Serial regulator Shunt component None of the above None Hint 62). Which of the following is the disadvantage of baker clamp circuit? High output voltage level Low output voltage level Zero output voltage level None of the above None Hint 63). The baker circuit in power type applications ____ the power dissipation? Increases Decreases Zero None of the above None Hint 64). The noise immunity of a darlington transistor type circuit with baker circuit is ____? Increases Decreases Zero None of the above None Hint 65). The NPN based transistor of CTDL has the voltage of ____ to operate? +6V -6V +12V Both a and b None Hint 66). The PNP based transistor of CTDL has the voltage of ____ to operate? +6V -6V -12V Both a and b None Hint 67). How many level shifting diodes are used in DTL IC in series? 1 3 2 4 None Hint 68). Inverting terminal is called ____ polarity? Positive Negative Both a and b Zero None Hint 69). Non-Inverting terminal is called ____ polarity? Positive Negative Both a and b Zero None Hint 70). The period consumed by a wave to reach the receiver is called? Propagation delay Time periods Cycles All the above None Hint 71). Propagation delay deals with ___ subjects? Networking Physics Electronics All the above None Hint 72). Frequency is expressed in terms of ____? Hertz Centimeters Meters Seconds None Hint 73). Load in an electric circuit is connected at ___ terminal? Input Output Intermediate All the above None Hint 74). Source either voltage or current is connected at ___ terminal? Input Output Intermediate All the above None Hint 75). A transistor is a ___ terminal device? 2 3 4 5 None Hint For More MCQs Transistor Transistor Logic Question & Answers Please fill in the comment box below. Time's up
