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UPPCL-JE’21 EE: Daily Practices Quiz 13-Dec-2021

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UPPCL-JE’21 EE: Daily Practices Quiz

UPPCL-JE’21 EE: Daily Practices Quiz 13-Dec-2021

Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 06 min.

Q1. The term artificial aging in instrument is associated with
(a) Springs
(b) Damping
(c) Permanent magnet
(d) Control torque

Q2. Relative permittivity can be measured by …… bridge.
(a) Wheatstone
(b) Hay’s
(c) De-Sauty
(d) Schering

Q3. Which of the following motors is most widely used for printers?
(a) DC series motor
(b) Stepper motor
(c) Synchronous motor
(d) Induction motor

Q4. The starting torque of a wound rotor induction motor can be increased by adding:
(a) External inductance to the rotor circuit
(b) External capacitance to the rotor circuit
(c) External resistance to the rotor circuit
(d) A combination of inductance and capacitance to the rotor circuit

Q5. For a slip ring induction motor if the rotor resistance is increased the
(a) Starting torque and efficiency increases
(b) Starting torque increases but efficiency decreases
(c) Starting torque and efficiency decreases
(d) Starting torque decreases but efficiency increases

Q6. Following is a 16-bit register for 8085 microprocessors:
(a) Accumulator
(b) Register B
(c) Register C
(d) Stack pointer

SOLUTIONS

S1. Ans.(c)
Sol. The term artificial aging in instrument is associated with permanent magnet.
Over a long period of time, permanent magnets are gradually demagnetized by the impact of heat fluctuation. The degree of deterioration depends on the type and material of magnet and the magnetic characteristics.

S2. Ans.(d)
Sol. The Schering bridge use for measuring the low permeability of the dielectric material.
NOTE:
The Schering bridge use for measuring the capacitance of the capacitor, dissipation factor, properties of an insulator, capacitor bushing, insulating oil and other insulating materials. It is one of the most commonly used AC bridge.

S3. Ans.(b)
Sol. Commercially, stepper motors are used in floppy disk drives, flatbed scanners, computer printers, plotters, slot machines, image scanners, compact disc drives, intelligent lighting, camera lenses, CNC machines, and 3D printers.

S4. Ans.(c)
Sol. Ts α R2
So, the starting torque of a wound rotor induction motor can be increased by adding external resistance to the rotor circuit.

UPPCL 2021, UPPCL JE ELECTRICAL QUIZ |_30.1

So, the starting torque of a slip ring rotor induction motor can be increased by adding external resistance to the rotor circuit.
While high starting torques are desirable, high rotor resistance results in a relatively high slip during normal running operation. The high resistance causes increased losses and reduced efficiency during normal operation.

S6. Ans.(d)
Sol. Stack pointer: 16-bit register

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