# What is the real time scheduling?

What is the real time scheduling?

Hard real-time and soft real-time are the types of real time scheduling. Real time

## Related questions

Description : What is a hard real time system?

Answer : If the real-time systems have minimum interrupt latency and task deadline with prescribe time limits then it is known as hard real-time systems.  If these two requirements meet in real time systems but not always then it is known as soft real-time systems.

Description : Explain event scheduling with suitable example.

Answer : Event scheduling: The assignment to signal x does not happen instantly. Each of the values assigned to x contain an afterclause. The mechanism for delaying the new value is called scheduling an event. By ... value. Event is nothing but change on target signal which is to be updated. Example: X

Description : For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when

Answer : For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when The incremental fuel cost of each plant multiplied by the penalty factor is the same

Description : The friction losses in Real Transformers are :  (A) 0% (B) 5% (C) 25% (D) 50%

Description :

(b)

Consider the circuit shown under the DC-steady-state condition.

(i)

Re-draw the circuit by replacing the capacitor and inductor with open and short-circuit.

(ii)

Determine the current, IL and the voltage, VC.

(iii)

Calculate the energy stored in the inductor and capacitor, respectively.

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What is Time of Day tariff? How it help in energy conservation?

Answer : Time-off-day tariff:- In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff /also the tariff in which P.F. of industrial consumer is taken ... the rated load for longer times of the day their overall efficiency gets higher helping to conserve energy.

Description : What is the Fourier transform of a Gaussian time pulse? A) Uniform B) Gaussian C) Impulses D) Pulse

Answer : What is the Fourier transform of a Gaussian time pulse? A) Uniform B) Gaussian C) Impulses D) Pulse

Description : What is the time response of a system whose poles lie on the right hand side of s-plane? A) Exponentially increasing B) Exponentially decreasing C) Sinusoidal oscillations D) Step response

Answer : What is the time response of a system whose poles lie on the right hand side of s-plane? A) Exponentially increasing B) Exponentially decreasing C) Sinusoidal oscillations D) Step response

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What is a time variant system?

Description : Explain slotted time quick return mechanism with neat sketch.

Answer : The slotted lever quick return mechanism is illustrated in Figs. a and b The crank AB (of adjustable length R) rotates with a uniform angular speed. The crank pin B is in the shape of a die block ... Fig. (b)) and the return stroke is completed in less time which is proportional to angle β.

Description :

Answer : It is denoted as τ, tau and has the value of 1/RC. We

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Description : sketch time period measurement by CRO.

Answer : Horizontal sweep is turned ON and the display appealing on the screen is adjusted by varying different control knobs provided on the front panel of CRO, till the signal is suitably displayed ... Where m=Number of division in one complete cycle n=Setting of time base =Time/Division

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Time constant for RC circuit formula

τ = RC

Where, τ = time constant

Answer : Time constant for RC circuit formula τ = RC Where, τ = time constant

Description : Define: 1) frequency, 2) cycle, 3) time period, 4) amplitude

Answer : 1) frequency: The total number of cycles completed in one second is called frequency. Its unit is cycles per second or Hertz (Hz). Its formula is f = 1/ T, where T is time period. ... is second per cycle. 4) amplitude: the maximum instantaneous value of sine wave is called as amplitude.

Description : The average time required to reach a storage location in the memory to read or retrieve the contents of memory is called as A) Turnaround time B) Latency time C) Access time D) Response time

Answer : The average time required to reach a storage location in the memory to read or retrieve the contents of memory is called as Access time

Description : If the displayed system time and date is wrong, you can reset it using :  (A) Task bar (B) Menu bar (C) Desk top (D) Control panel

Answer : If the displayed system time and date is wrong, you can reset it using : Control panel

Description : The operating time of instantaneous relay is

Answer : The operating time of instantaneous relay is 0.1 sec

Description : The time base signal in Cathode Ray Oscilloscope (CRO) is  (1) A square wave signal (2) A sawtooth signal (3) A triangular wave signal (4) A sinusoidal signal

Description : In electric traction for a trapezoidal speed-time curve, the time period is (A) free running speed period = constant speed period (B) free running period = coasting period (C) free running period + coasting period = constant speed period (D) average speed period = scheduled speed period

Answer : In electric traction for a trapezoidal speed-time curve, the time period is free running period + coasting period = constant speed period

Description : The time period of third harmonic of power supply frequency, in milliseconds, is (A) 20 (B) 3.33 (C) 6.66 (D) 60

Answer : The time period of third harmonic of power supply frequency, in milliseconds, is 6.66

Description : With fault clearing time, the transient stability of a power system

Answer : With fault clearing time, the transient stability of a power system decreases

Description : The time constant of the servo-mechanism can be decreased by

Answer : The time constant of the servo-mechanism can be decreased by decreasing the inertia of the system

Description : ln HRC fuse the time between cut-off and final current zero is called

Answer : ln HRC fuse the time between cut-off and final current zero is called the arcing time

Description : The time constant of a series R-C circuit is given by?

Answer : The time constant of a series R-C circuit is given by RC.

Description :

Time constant of a capacitive circuit?

Answer : Time constant of a capacitive circuit increase with increase of capacitance and increase of resistance.

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Time constant of a circuit is the time in seconds taken after the application of voltage to each?

Answer : Time constant of a circuit is the time in seconds taken after the application of voltage to each 63% of maximum value.

Description : The time constant of the capacitance circuit is defined as the time during which voltage?

Answer : The time constant of the capacitance circuit is defined as the time during which voltage rises to 63.2% of its final steady value.

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Time constant of an inductive circuit?

Answer : Time constant of an inductive circuit increases with increase of inductance and decrease of resistance.

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For a frequency of 200 Hz, the time period will be?

Answer : For a frequency of 200 Hz, the time period will be 0.005 s.

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Answer : Integrating instruments are those which measure the total quantity of electricity delivered in a particular time.

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Answer : The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.

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Answer : The relay with inverse time characteristic will operate within 5 to 10 sec.

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Answer : The time of closing the cycle, in modern circuit breakers is 0.003 sec.

Description : The transit time of the current carriers through the channel of a JFET decides it's?

Answer : The transit time of the current carriers through the channel of a JFET decides it's gate characteristics.

Description : At which time power factor of the induction motor is low?

Answer : The power factor of the inducction motor is low at the time of starting as compare to while the induction motor is running.

Description : Linear Time Invariant (LTI) System

Answer : Linear Time Invariant System Linear system means a system which possesses the property of superposition. Time invariant system means its behavior and characteristics are fixed over time. Before ... from the impulse response. Impulse response is related to frequency response via Fourier transform.

Description : Time Domain Reflectometry (TDR)

Answer : Time Domain Reflectometry (TDR) TDR is a application of pulse technique and it is a echo technique. In this technique we observe and analyses  the reflected ... determine the length of the transmission line. This is easy and inexpensive technique.

Description :

Answer : Some embedded systems have Real-Time Operating Systems (RTOS) and some of them not. Real-Time Operating Systems is a platform for building applications for embedded systems, Smaller Software ... they just have application code without RTOS. Every Real-Time Operating Systems have the kernel.

Description :

Answer : There are two main types of task scheduling algorithm in Real-Time Operating Systems (RTOS).1. Rate Monotonic Scheduling (RMS)2. Earliest-Deadline-First (EDF)Rate Monotonic Scheduling ( ... shortest period process and so on.Rate Monotonic Scheduing do not support non-periodic processees.

Description :

Answer : The scheduler is very important in Real-Time Operating System (RTOS). Selection of tasks for execution is provided by the scheduler. Which task to execute when it is provided by the ... . Non-preemptive scheduling is simple.Preemptive scheduling is flexible while non-preemptive scheduling is rigid.

Description : What is watchdog timer ? Explain the implementation of time out for ATM with block diagram and program.

Answer : A special type of timer is a watchdog timer, which will reset the system after a predefined timeout. Watchdog timer reset timer every X time unit, else timer generates a signal ... be loaded into timereg. This is to prevent erroneous software from unintentionally resetting the watchdog timer.

Description : Which of the following statements is not true about disk-arm scheduling algorithms ? (A) SSTF (shortest seek time first) algorithm increases performance of FCFS. (B) The number of requests for disk service are not influenced by file allocation method. (C) Caching the directories and index blocks in main memory can also help in reducing disk arm movements. (D) SCAN and C-SCAN algorithms are less likely to have a starvation problem.

Answer : (B) The number of requests for disk service are not influenced by file allocation method.

Description : A scheduling Algorithm assigns priority proportional to the waiting time of a process. Every process starts with priority zero (lowest priority). The scheduler re-evaluates the process priority for every 'T' time units and decides next process to be scheduled. If the process have no I/O operations and all arrive at time zero, then the scheduler implements .............. criteria. (A) Priority scheduling (B) Round Robin Scheduling (C) Shortest Job First (D) FCFS

Answer : (B) Round Robin Scheduling

Description : Consider three CPU intensive processes P1, P2, P3 which require 20, 10 and 30 units of time, arrive at times 1, 3 and 7 respectively. Suppose operating system is implementing Shortest Remaining Time first (preemptive scheduling) algorithm, then .............. context switches are required (suppose context switch at the beginning of Ready queue and at the end of Ready queue are not counted). (A) 3 (B) 2 (C) 4 (D) 5

Description : Which of the following scheduling algorithms may cause starvation? a. First-come-first-served b. Round Robin c. Priority d. Shortest process next e. Shortest remaining time first (1) a, c and e (2) c, d and e (3) b, d and e (4) b, c and d

Description : Which scheduling policy is most suitable for a time-shared operating system?  A) Shortest job first B) Round robin C) First come first serve D) Elevator

Answer : Which scheduling policy is most suitable for a time-shared operating system?  Round robin

Description : What are the essential tight constraint/s related to the design metrics of an embedded system? A. Ability to fit on a single chip B. Low power consumption C. Fast data processing for real-time operations D .All of the above

Answer : D .All of the above

Description : What is the speciality of WINDOWS–NT? (1) supports real–time processing (2) supports LAN and WAN (3) supports Batch processing (4) supports multi–processing