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Practice Questions & Answers :: Cocubes

36.99K

Tot. Mock Test: 71+


Tot. Exam. Sec.: 5+


Total Practice Qs: 57+

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Which flags represent the least significant bit (LSB) and most significant bit (MSB) of Program Status Word (PSW) respectively?


AParity Flag & Carry FLag

BParity Flag & Auxiliary Carry Flag

CCarry Flag & Overflow Flag

DCarry Flag & Auxiliary Carry Flag

Answer: Option A

Explanation:


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Which among the following is not an advantage of an open loop system?


ASimplicity in construction & design

B

C

DRequirement of system recalibration from time to time

Answer: Option D

Explanation:

Advantages of open loop control system: 1. Simplicity and stability: they are simpler in their layout and hence are economical and stable too due to their simplicity. 2. Construction: Since these are having a simple layout so are easier to construct.

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The closed system has higher ________ than open loop control system, this implies increased speed of response.


AGain

BBandwidth

CFrequency

DSpeed

Answer: Option B

Explanation:

As transient response of the system is improved by the use of feedback and it causes the settling time to reduce and closed loop system has higher bandwidth than open loop systems and this implies increase in speed of response.

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In signal flow graph, the product of all ______gains while going through a forward path is known as


ABranch

BPath

CNode

D

Answer: Option A

Explanation:

Path gain is the product of the gains of all the branches in the path.

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Consider the junction diode as ideal. The value of current flowing through


A10^-1 A

B10^-3 A

C100 A

D10^-2A

Answer: Option D

Explanation:

Vab = 4-(-6)=10V I=V/R = 10/1000 = 10^-2A

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In semiconductors at a room temperature


AThe valence band is completely filled and the conduction band is partially filled

BThe valence band is completely filled

CThe conduction band is completely empty

DThe valence band is partially empty and the conduction band is partially filled

Answer: Option D

Explanation:

At room temperature, a semiconductor has enough free electrons to allow it to conduct current. This is onl;y posible when there are some free electrons in the conduction band.

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An AM demodulator can be implemented with a linear multiplier followed by a ________ filter.


ALow pass

BHigh-pass

CBand-pass

DBand-stop

Answer: Option A

Explanation:

Block Diagram of AM DEMODULATOR. After the rectifier a Low Pass filter is used to remove unwanted frequencies.



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Determine the total discharge time for the capacitor in a clamper having C = 0.01


A5ms

B25ms

C2.5ms

D50ms

Answer: Option B

Explanation:

The capacitor will fully charge or discharge in 5 time constants. So, 5*R*C= 25 ms.

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For a series resonant circuit at low frequency circuit impedance is __________ and at high frequency circuit impedance is __________


Acapacitive,inductive

Binductive,capacitive

Cresistive,inductive

Dcapacitive,resistive

Answer: Option A

Explanation:

From seeing the graph we can see that at low frequency (?0 )the impedance is inductive


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In a regulated supply, what term describes how much change occurs in the output voltage over a certain range of load current values, from minimum to maximum current?


Aline regulation

Bvoltage regulator

Ccurrent regulator

Dload regulation

Answer: Option D

Explanation:

Load regulation is the capability to maintain a constant voltage (or current) level on the output channel of a power supply despite changes in the supply's load (such as a change in resistance value connected across the supply output).

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Here is the list of questions asked in Cocubes paper Practice questions with Answers Page 2. Practice Cocubes Written Test Papers with Solutions and take Q4Interview Cocubes Online Test Questions to crack Cocubes written round test. Overall the level of the Cocubes Online Assessment Test is moderate. Only those candidates who clear the written exam will qualify for the next round, so practic all the questions here and take all the free tests before going for final selection process of Cocubes