UPPSC-LECTURER’21 EE: Daily Practices Quiz 09-Dec-2021

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Exam Date: 22/12/2021

UPPSC polytechnic lecturer QUIZ: EE

UPPSC-LECTURER’21 EE: Daily Practices Quiz 09-Dec-2021

Each question carries 3 marks.
Negative marking: 1 mark each or 1/3rd
Total Questions: 06
Time: 08 min.

Q2. A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):
(a) Ex-NOR gate
(b) OR gate
(c) Ex-OR gate
(d) None of the above

Q3. How many bits are used in data bus of 8051?
(a) 8
(b) 16
(c) 24
(d) 32

Q4. Which bus is a bidirectional bus?
(a) Address bus
(b) Data bus
(c) Address bus and data bus
(d) None of the above

Q5. In a shaded pole single-phase motor, the revolving field is produced by the use of
(a) Inductor
(b) Capacitor
(c) Resistor
(d) Shading coils

Q6. A pole pitch in an electrical machine is
(a) Equal to 180° Electrical
(b) Equal to 180° Mechanical
(c) Less than 180° electrical
(d) Greater than 180° electrical

SOLUTIONS

S1. Ans.(d)
Sol. Truth table of EX-OR:

Boolean expression:

From the truth table, it is analysed that the output is high when A or B is high, but it is not high when both are high. That’s why this logic circuit is known as an exclusive-OR gate.
Thus, the inputs must be different to get high output from the two-input exclusive OR gate.

S2. Ans.(c)
Sol. Truth table of EX-OR:

Boolean expression:

From the truth table, it is analysed that the output is high when A or B is high, but it is not high when both are high. That’s why this logic circuit is known as an exclusive-OR gate.
Thus, the inputs must be different to get high output from the two-input exclusive OR gate.

S3. Ans.(a)
Sol. In an 8051 microcontroller:
• Data bus: 8-bit
• RAM: 128 bytes
• ROM: 4KB
• I/0 pin: 32
• Number of interrupts: 5
• Timer/counter: 2

S4. Ans.(b)
Sol. The address bus is used to specify a physical address in the memory while the data bus is used to transmit data among components in both directions. Therefore, the address bus is unidirectional while the data bus is bidirectional.

S5. Ans.(d)
Sol. In a shaded pole single-phase motor, the revolving field is produced by the use of
Shading coils.
The shaded pole induction motor is simply a self-starting single-phase induction motor whose one of the poles is shaded by the copper ring. The copper ring is also called the shaded ring. This copper ring act as a secondary winding for the motor.

S6. Ans.(a)
Sol. 1 pole pitch=180⁰ electrical

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