In I_{CEO}, wt does the subscript ‘CEO’ mean?

- a)collector to base emitter open
- b)emitter to base collector open
- c)collector to emitter base open
- d)emitter to collector base open

Correct answer is option 'C'. Can you explain this answer?

Shrinjini answered • 2 hours ago

The subscript ‘CEO’ means that it is collector to emitter base open. It is called as the leakage current. It occurs in a reverse bias in PNP transistor. The total current can be calculated by I_{C}=βI_{B}+I_{C.}

Increase in collector emitter voltage from 5V to 8V causes increase in collector current from 5mA to 5.3mA. Determine the dynamic output resistance.

- a)20kΩ
- b)10kΩ
- c)50kΩ
- d)60kΩ

Correct answer is option 'B'. Can you explain this answer?

Souro Mukherjee answered • 2 hours ago

: r_{o}=∆V_{CE}/∆I_{C}

=3/0.3m=10kΩ.

=3/0.3m=10kΩ.

A full wave rectifier uses load resistor of 1500Ω. Assume the diodes have Rf=10Ω, Rr=∞. The voltage applied to diode is 30V with a frequency of 50Hz. Calculate the AC power input.

- a)368.98mW
- b)275.2mW
- c)145.76mW
- d)456.78mW

Correct answer is option 'B'. Can you explain this answer?

Sanjukta Pal answered • 2 hours ago

The AC power input P_{IN}=I_{RMS}^{2}(R_{F}+R_{r}).

I_{RMS}=I_{m}/√2=V_{m}/(R_{f}+R_{L})√2=30/(1500+10)*1.414=13.5mA

So, P_{IN}=(13.5*10-3)2*(1500+10)=275.2mW.

I

So, P

The CT for an abrupt PN junction diode is ________

- a)C
_{T}= K/(V_{0}+V_{B})^{1/2} - b)C
_{T}= K/(V_{0}+V_{B})^{-1/2} - c)C
_{T}= K/(V_{0}+V_{B})^{1/3} - d)C
_{T}= K/(V_{0}+V_{B})^{-1/3}

Correct answer is option 'A'. Can you explain this answer?

Abhishek Kumar answered • 2 hours ago

For an abrupt PN junction diode, C_{T} = K/(V_{0}+V_{B})^{n}. Here, n=1/2 for abrupt PN junction diode and 1/3 for linear PN junction diode. When the doping concentration of a diode varies within a small scale of area, then the diode is called as an abrupt diode.

SAURABH KUMAR asked • 12 minutes ago

In overhead transmission lines when w is the weight per unit length of conductor, d is themaximum sag, 2L is the span between two supports and T is the tension in the conductor,then which of the following relation is not valid?

- a)for constant L and w, T d μ 1
- b)for constant T and w, d μ L2
- c)for constant L and T, d μ w2
- d)for constant L and d, T μ w

Correct answer is option 'C'. Can you explain this answer?

The figure show the per-phase representation of a phase-shifting transformer connected between buses 1 and 2, where α is a complex number with non-zero real and imaginary parts.

For the given circuit, Y_{bus} and Z_{bus} are bus admittance matrix and bus impedance matrix, respectively, each of size 2 x 2. Which one of the following statements is true?

- a)Both Y
_{bus}and Z_{bus}are symmetric - b)Y
_{bus}is symmetric and Z_{bus}is unsymmetric - c)Y
_{bus}is unsymmetric and Z_{bus}is symmetric - d)Both Y
_{bus}and Z_{bus}are unsymmetric

Correct answer is option 'D'. Can you explain this answer?

TANMAY KATOCH answered • 2 hours ago

A 25 kVA, 400 V, D - connected, 3-phase, cylindrical rotor synchronous generator requires a field current of 5 A to maintain the rated armature current under short-circuit condition. For the same field current, the open-circuit voltage is 360 V. Neglecting the armature resistance and magnetic saturation, its voltage regulation (in % with respect to terminal voltage), when the generator delivers the rated load at 0.8 pf leading, at rated terminal voltage is _________.

Correct answer is between '-15,-14'. Can you explain this answer?

SNEHIL SATYAM answered • 2 hours ago

Hint: Obtained regulation should be negative.

Compute the divergence of the vector xi + yj + zk.

- a)0
- b)1
- c)2
- d)3

Correct answer is option 'D'. Can you explain this answer?

AKSHAY KUMAR answered • 2 hours ago

Answer: d

Explanation: The vector given is a position vector. The divergence of any position vector is always 3.

Explanation: The vector given is a position vector. The divergence of any position vector is always 3.

A 20 kVA, 2000/200V, 1-phase transformer has name-plate leakage impedance of 8%. Voltage required to be applied on the high-voltage side to circulate full-load current with the low-voltage winding short-circuited will be

- a)16 V
- b)56.56 V
- c)160 V
- d)568.68 V

Correct answer is option 'C'. Can you explain this answer?

ARGHA RAY answered • 2 hours ago

V = 0.08 × 1 pu

∴ V actual = 0.08 × 2000 = 160V

∴ V actual = 0.08 × 2000 = 160V

An N-channe! JFET has I_{DSS} = 8 mA and Vp = -5 V. The minimum values of V_{DS} for pinch- off region and the drain current IDS for V_{GS}= - 2V in the pinch-off region are respectively.

- a)2 V and 1.8 mA
- b)3 V and 2.9 mA
- c)2 V and 2.9 mA
- d)3 V and 1.8 mA

Correct answer is option 'B'. Can you explain this answer?

ANKIT KUMAR answered • 2 hours ago

The minimum value of V_{DS} for pinch-off to occur for V_{GS} = -2V is

Romsha Sinha asked • 30 minutes ago

Which of the following represents the continuity equation?

- a)dp/dt=-(p-p0)/τp+Dp(d
^{2p}/dx^{2})-µpd(ρϵ)/dx - b)dp/dt=-(p-p0)/τp-Dp(d
^{2p}/dx^{2})-µpd(ρϵ)/dx - c)dp/dt=-(p-p0)/τp+Dp(d
^{2p}/dx^{2})+µpd(ρϵ)/dx - d)dp/dt=(p-p0)/τp-Dp(d
^{2p}/dx^{2})-µpd(ρϵ)/dx

Correct answer is option 'A'. Can you explain this answer?

Deepanshu asked • 35 minutes ago

Given a > 0, we wish to calculate its reciprocal value 1/a by using Newton Raphson Method for f(x) = 0

- a)0.11,0.1299
- b)0.12,0.1392
- c)0.12,0.1416
- d)0.13.0.1428

Correct answer is option 'B'. Can you explain this answer?

Jitendra Gupta asked • 1 hour ago

If the electromagnetic torque in a DC shunt-generator is opposite, what can be further concluded?

- a)Mechanical power is absorbed by the machine
- b)Mechanical power is delivered by the machine
- c)Electromagnetic torque is in same direction of prime mover
- d)None of the mentioned

Correct answer is option 'A'. Can you explain this answer?

Esakshi asked • 1 hour ago

In a P type silicon sample, the hole concentration is 2.25 x 10^{15} / cm^{3}. If the intrinsic carrier concentration is 1.5 x 10^{10}/ cm^{3} the electron concentration is

- a)zero
- b)10
^{10}/cm^{3} - c)10
^{5}/cm^{3} - d)1.5 x 10
^{25}/cm^{3}

Correct answer is option 'C'. Can you explain this answer?

Romsha Sinha asked • 1 hour ago

The switch is at position shown in the figure initially and steady state is from t=0 to t=to. The switch suddenly is thrown to the other position. The current flowing through the 10K resistor from t=0 is?

- a)1mA
- b)2mA
- c)-2mA
- d)-1mA

Correct answer is option 'C'. Can you explain this answer?

Nitin Kumar asked • 2 hours ago

A single phase semiconverter has a freewheeling diode. If the firing angle is

a

and the load is purely resistive, the periods of conduction and freewheeling respectively are- a)p-aand 0
- b)p-aanda
- c)p+aand 0
- d)p+aanda

Correct answer is option 'A'. Can you explain this answer?

ANJU RANI asked • 3 hours ago

A multimeter having a sensitivity of 2 kΩ/V is used for the measurement of voltage across a circuit having an output resistance of 10 kΩ. The open circuit voltage of the circuit is 6 volts. The percentage error in multimeter reading when it is set to 10 volt is given by

- a)33% low
- b)22% high
- c)33% high
- d)22% low

Correct answer is option 'A'. Can you explain this answer?

DEEPA KUMARI asked • 4 hours ago

The continuous time system described by 2 y(t) = x (t^{2}) is

- a)Causal, linear and time varying
- b)Causal, non-linear and time varying
- c)Non causal, non-linear and time-invariant
- d)Non causal, linear and time-invariant

Correct answer is option 'D'. Can you explain this answer?

Rohit Kumar asked • 4 hours ago

As per IE rule, if the leakage current in an electrical installation exceeds a specified value, no supply should be given until the cause of the same is removed, this specified value is 1/5000 the part of ...............

- a)maximum current in the circuit
- b)cable rating of the circuit
- c)fuse rating of the circuit
- d)OL letting of the circuit breaker

Correct answer is option 'A'. Can you explain this answer?

NAINCY PRAKASH asked • 4 hours ago

I. DC shunt motor – Lathe machine

II. DC compound generator – Drilling machine

III. Differentially compounded generator – welding purposes

Above are the applications of the dc machines, but all are not matched correctly. Choose the wrong marking

II. DC compound generator – Drilling machine

III. Differentially compounded generator – welding purposes

Above are the applications of the dc machines, but all are not matched correctly. Choose the wrong marking

- a)II
- b)III
- c)I,III
- d)III,II

Correct answer is option 'A'. Can you explain this answer?

JATIN AGGARWAL asked • 5 hours ago

The collector contact region is doped with higher concentration of n-type impurities due to:

- a)It creates a depletion region at the contact surface
- b)It creates a low conductivity path between collector region and contact
- c)It reduces a contact resistance
- d)It can withstand high voltages as compared to collector region

Correct answer is option 'C'. Can you explain this answer?

PUSHP LATA asked • 5 hours ago

Chirag decided to give 12% of his salary to his younger brother as a pocket money. But he gave 1260 Rs which was 60% of what he had decided earlier. How much is Chirag’s salary?

- a)18500 Rs
- b)16500 Rs
- c)17500 Rs
- d)15800 Rs

Correct answer is option 'C'. Can you explain this answer?

Aarushi Amlan asked • 6 hours ago

Diode acts as a short circuit when switched from forward to reverse bias for some time due to______

- a)Accumulation of minority charge carriers when it’s in forward bias
- b)Accumulation of majority charge carriers when it’s in forward bias
- c)Accumulation of minority charge carriers when it’s in reverse bias
- d)Accumulation of majority charge carrier when it’s in reverse bias

Correct answer is option 'A'. Can you explain this answer?

Rachika Grewal asked • 7 hours ago

Avalanche breakdown in zener diode is ______

- a)electric current multiplication takes place
- b)phenomenon of voltage multiplication takes place
- c)electrons are decelerated for a period of time
- d)sudden rise in voltage takes place.

Correct answer is option 'A'. Can you explain this answer?

MENKA PARASHAR asked • 7 hours ago

Two generating units rated 300 MW and 400 MW have governor speed regulation of 6% and 4% respectively from no load to full load. Both the generating units are operating in parallel to share a load of 600 MW. Assuming free governor action, the load shared by the larger unit is _______ MW.

Correct answer is between '395,405'. Can you explain this answer?

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