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A modulo -6 ripple counter with J-K flip-flops uses at the clear input, the output from (a) NAND gate with QB,Qc as inputs (b) NAND gate with QA, Q8 as inputs (c) NAND gate with QA, Qc as inputs (d) AND gate with QB, Qc as inputs

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 A J -K flip-flop with J= 1 and K= 1 has a 20 kHz clock input. The Q output is : (A) Constant and low (B) Constant and high (C) A square wave with 20 kHz frequency (D) A square wave with 10 kHz frequency

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
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asked May 26, 2018 in Digital Electronics by Shimroz123
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The output of a JK flip-flop with asynchronous preset and clear inputs is ‘1’. The output can be changed to ‘0’ with one of the following conditions by applying A) J = 0, K = 0 and using a clock B) J = 1, K = 0 and using the clock C) Asynchronous preset input D) J = 1, K = 1 and using the clock 

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asked Apr 9, 2018 in Electronics Engineering by Shimroz123
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Each flip-flop in a 4-bit ripple counter introduces a maximum delay of 40 n sec. The maximum clock frequency is (a) 2.65 MHz (b) 6.25 MHz (c) 5.26 MHz (d) 6.52 MHz 

asked May 26, 2018 in Electronics Engineering by Shimroz123
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In a positive edge triggered JK flip-flop, J = 1, K = 0 and clock pulse is rising, Q will be (a) 0 (b) 1 (c) showing no change (d) toggle 

asked May 26, 2018 in Digital Electronics by Shimroz123
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How is a J-K Flip Flop made to toggle  (a) J=0, K=0 (b) J=1, K=0 (c) J=0, K=1 (d) J=1, K=1 

asked May 23, 2018 in Digital Electronics by Shimroz123
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asked May 23, 2018 in Digital Electronics by Shimroz123
1 answer 17 views

A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is: A. 8.57% B. 42.85% C. 4.28% D. 85.7%

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
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asked Apr 9, 2018 in Electronics Engineering by Shimroz123
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asked May 24, 2018 in Electrical Measurements and Instrumentation by Shimroz123
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asked Jul 1 by Shimroz123
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The output of a 2-input NAND gate with high at both the inputs will be • High • Low • High & low • None of the above.

asked May 14, 2018 in Digital Electronics by Shimroz123
1 answer 15 views

In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

asked Apr 26, 2018 in Electronics Engineering by Shimroz123
1 answer 13 views

The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc voltage with resistive load and without filter will be • 12.1 volt • 1.21 volt • 0.482 volt • 4.82 volt

asked May 13, 2018 in Electronics Engineering by Shimroz123
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The output clock frequency for a frequency division circuit having 11 flipflops with an input clock frequency of 20.48 MHz is : (A) 10.24 kHz (B) 5 kHz (C) 10 kHz (D) 5.12 kHz

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
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A 6-pole, 50Hz, 3-φ induction motor is running at 950 r.p.m. and has Cu loss of 5kW. The rotor input is (a) 10 kW (b) 95 kW (c) 100 kW (d) 9.5 kW 

asked May 25, 2018 in Induction Machine by Shimroz123
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The power supply whose output voltage varies with variation in input voltage or output load current is known as   (a) Regulated Power Supply (b) Unregulated Power Supply (c) Uninterruptible Power Supply (d) Switched Mode Power Supply 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

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asked Apr 9, 2018 in Electronics Engineering by Shimroz123
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State function of preset and clear in flip flop.

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asked May 29, 2018 in Electronics Engineering by Shimroz123
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asked Apr 5, 2018 in Electronics Engineering by Shimroz123
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A plant with 10 MW installed capacity produces an annual output of 6 × 6 10 kWh and remains in operation for 2000 hours in a year. The Plant Use Factor is (A) 0.33 % (B) 3.33 % (C) 15 % (D) 30 % 

asked Jun 4, 2018 in Power system by Shimroz123
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The duty ratio of a step-up chopper with an output voltage of 200 V from a 80 V dc source, is (A) 0.4 (B) 0.5 (C ) 0.6 (D) 1.5 

asked Jun 4, 2018 in Power Electronics by Shimroz123
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The output voltage of a battery drops from 100 V with zero load current to 80 V when load current is 2 A. The internal resistance of the battery is (a) 10 Ω (b) 20 Ω (c) 40 Ω (d) 50 Ω

asked May 25, 2018 in Battery by Shimroz123
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The power input to the rotor of a 400V, 50 Hz 6 pole three phase induction motor is 20kW. The slip is 3%. The frequency of rotor currents is: (A) 1 Hz (B) 1.5 Hz (C) 2 Hz (D) 1 2 Hz

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

The output power of a filter is 100 mW, when the signal frequency is 6 kHz. When the frequency is increased to 25 kHz, the output power falls to 50 mW. What is the dB change in power ? (a) -3 dB (b) -5 dB (c) -7 dB (d) -2 dB

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1 answer 24 views

Consider a continuous-time system with input x(t) & output y(t) are related by y(t) = x (sin t). This system is (A) causal & linear (B) non-causal & linear (C) causal & non-linear (D) non-causal & non-linear

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For a two port network, with output shorted, V1=25V, I1=1 A,I2=2A. With input open circuited, V1=10 V,V2= 50 V,I2= 2 A. h12 and h21 are  A) 0.2 and 25 B) 25 and 0.2 C) 0.4 and 2 D) 0.2 and 2

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
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For an 8 bit DAC, reference voltage is 10 V. If input to DAC starting from MSB is 10111100, output (in volts) is  A) 5.8 B) 6.4 C) 7.3 D) 8.2

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What is the output voltage of a battery if 12 J of energy is expended in moving 1 C of charge?

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What is the output voltage of a battery if 10 J of energy is expended in moving 1.25 C of charge?

asked Jul 1 by Shimroz123
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The input frequency is 50 Hz. The ripple frequency in a 12 phase full wave rectifier is (A) 1200 Hz (B) 600 Hz (C) 100 Hz (D) 50 Hz 

asked Apr 23, 2018 in Instrumentation and control by Shimroz123
1 answer 24 views

The primary winding of a 220/6 V, 50 Hz transformer is energised from 110 V, 60 Hz supply. The secondary output voltage will be; (A) 3.6 (B) 2.5 V (C) 3.0 V (D) 6.0 V

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

Draw the circuit diagram of bridge rectifier with π filter. Draw its input and output waveform. 

asked 5 days ago in Elements of Electronics by Shimroz123
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Explain Center-tapped full wave rectifier with the help of circuit diagram and draw input output waveforms. 

asked 5 days ago in Elements of Electronics by Shimroz123
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Explain full wave bridged rectifier with the help of circuit diagram and input output waveform.

asked Sep 5, 2018 by Shimroz123
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Compare BJT common base configuration with common collector configuration on the basis of (i) Current gain (ii) Voltage gain (iii) Input impedance (iv) Output impedance

asked Sep 2, 2018 by Shimroz123
1 answer 25 views

In a JK flip-flop, for what input next state is complement of the present state (A)J=0,K=0 (B)J=1,K=0 (C)J=0,K=1 (D)J=1,K=1

asked May 12, 2018 in Digital Electronics by Shimroz123
0 answers 18 views

What is the clock cycle time for a system that uses a clock with frequency of 150 kHz?  (A) 55 µ sec (B) 5.5 µ sec (C) 202 sec (D) 6.6 µ sec 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

A 6 pole 3-phase wound-rotor induction machine is driven by another machine at 1800 rpm. The rotor of the induction machine is connected to a 50Hz system. If the mechanical rotation of the rotor is in the same direction as the rotor winding flux rotation, then frequency of the stator voltage will be

asked Apr 1, 2018 in Electrical Engineering by Shimroz123
2 answers 21 views

Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to:  (1) 1 (2) 0.5 (3) 0.75 (4) 0.33

asked May 22, 2018 in Electronics Engineering by Shimroz123
1 answer 8 views

A 4 bit counter is used to count from 0,1,2...n. Value of “n” is

asked May 14, 2018 in Digital Electronics by Shimroz123

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