Question 1

SMPS is used for

Accepted Answer

A) obtaining controlled ac power supply 
B) obtaining controlled dc power supply 
C) storage of dc power 
D) switch from one source to another 
A) obtaining controlled ac power supply 
B) obtaining controlled dc power supply 
C) storage of dc power 
D) switch from one source to another B

Question 2

What is the output as a function of the input voltage (for positive values) for the given figure. Assume it's an ideal op-amp with zero forward drop (Di=0)

Accepted Answer

A) 0 
B) -vi 
C) vi 
D) 2vi 
A) 0 
B) -vi 
C) vi 
D) 2vi C

Question 3

If peak voltage for a half wave rectifier circuit is 5V and diode cut in voltage is 0.7, then peak inverse voltage on diode will be?

Accepted Answer

A) 5v 
B) 4.9v 
C) 4.3v 
D) 6.7v 
A) 5v 
B) 4.9v 
C) 4.3v 
D) 6.7v C

Question 4

Due to centre tap Vm=400/2=200) IRMS=198/?2=140mA, IAVG=2*198/ ?=126mA. ?=[(140/126)2-1]1/2=0.48. So, ?=48%.

Accepted Answer

A) 0.623 
B) 0.678 
C) 0.693 
D) 0.625 
A) 0.623 
B) 0.678 
C) 0.693 
D) 0.625

Question 5

------------------is used in the rotating type UPS system to supply the mains.

Accepted Answer

A) dc motor 
B) self excited dc generator 
C) alternator 
D) battery bank 
A) dc motor 
B) self excited dc generator 
C) alternator 
D) battery bank

Question 6

A full wave rectifier delivers 50W to a load of 200?. If the ripple factor is 2%, calculate the AC ripple across the load.

Accepted Answer

A) 2v 
B) 5v 
C) 4v 
D) 1v 
A) 2v 
B) 5v 
C) 4v 
D) 1v

Question 7

What is done in switching regulators to minimize its power dissipation during switching?

Accepted Answer

A) uses external transistor 
B) uses 1mh choke 
C) uses external transistor and 1mh choke 
D) none of the mentioned 
A) uses external transistor 
B) uses 1mh choke 
C) uses external transistor and 1mh choke 
D) none of the mentioned

Question 8

The arrow on the symbol of MOSFET indicates

Accepted Answer

A) that it is a n-channel mosfet 
B) the direction of electrons 
C) the direction of conventional current flow 
D) that it is a p-channel mosfet 
A) that it is a n-channel mosfet 
B) the direction of electrons 
C) the direction of conventional current flow 
D) that it is a p-channel mosfet

Question 9

The output characteristics of a MOSFET, is a plot of

Accepted Answer

A) id as a function of vgs with vds as a parameter 
B) id as a function of vds with vgs as a parameter 
C) ig as a function of vgs with vds as a parameter 
D) ig as a function of vds with vgs as a parameter 
A) id as a function of vgs with vds as a parameter 
B) id as a function of vds with vgs as a parameter 
C) ig as a function of vgs with vds as a parameter 
D) ig as a function of vds with vgs as a parameter

Question 10

If the input frequency of a half wave rectifier is 100Hz, then the ripple frequency will be

Accepted Answer

A) 150hz 
B) 200hz 
C) 100hz 
D) 300hz 
A) 150hz 
B) 200hz 
C) 100hz 
D) 300hz

Question 11

In the internal structure of a MOSFET, a parasitic BJT exists between the

Accepted Answer

A) source & gate terminals 
B) source & drain terminals 
C) drain & gate terminals 
D) there is no parasitic bjt in mosfet 
A) source & gate terminals 
B) source & drain terminals 
C) drain & gate terminals 
D) there is no parasitic bjt in mosfet

Question 12

-----------------is used for critical loads where temporary power failure can cause a great deal of inconvenience.

Accepted Answer

A) smps 
B) ups 
C) mps 
D) rccb 
A) smps 
B) ups 
C) mps 
D) rccb

Question 13

Efficiency of a half wave rectifier is

Accepted Answer

A) 50% 
B) 60% 
C) 40.6% 
D) 46% 
A) 50% 
B) 60% 
C) 40.6% 
D) 46%

Question 14

Transformer utilisation factor of a half wave rectifier is

Accepted Answer

A) 0.234 
B) 0.279 
C) 0.287 
D) 0.453 
A) 0.234 
B) 0.279 
C) 0.287 
D) 0.453

Question 15

The controlling parameter in MOSFET is

Accepted Answer

A) vds 
B) ig 
C) vgs 
D) is 
A) vds 
B) ig 
C) vgs 
D) is

Question 16

Choose the correct statement

Accepted Answer

A) mosfet is a unipolar, voltage controlled, two terminal device 
B) mosfet is a bipolar, current controlled, three terminal device 
C) mosfet is a unipolar, voltage controlled, three terminal device 
D) mosfet is a bipolar, current controlled, two terminal device 
A) mosfet is a unipolar, voltage controlled, two terminal device 
B) mosfet is a bipolar, current controlled, three terminal device 
C) mosfet is a unipolar, voltage controlled, three terminal device 
D) mosfet is a bipolar, current controlled, two terminal device

Question 17

In the transfer characteristics of a MOSFET, the threshold voltage is the measure of the

Accepted Answer

A) minimum voltage to induce a n-channel/p- channel for conduction 
B) minimum voltage till which temperature is constant 
C) minimum voltage to turn off the device 
D) none of the above mentioned is true 
A) minimum voltage to induce a n-channel/p- channel for conduction 
B) minimum voltage till which temperature is constant 
C) minimum voltage to turn off the device 
D) none of the above mentioned is true

Question 18

Static UPS requires

Accepted Answer

A) only rectifier 
B) only inverter 
C) both inverter and rectifier 
D) none of the mentioned 
A) only rectifier 
B) only inverter 
C) both inverter and rectifier 
D) none of the mentioned

Question 19

In a half wave rectifier, the sine wave input is 50sin50t. If the load resistance is of 1K, then average DC power output will be?

Accepted Answer

A) 3.99v 
B) 2.5v 
C) 5.97v 
D) 6.77v 
A) 3.99v 
B) 2.5v 
C) 5.97v 
D) 6.77v

Question 20

Efficiency of a centre tapped full wave rectifier is

Accepted Answer

A) 50% 
B) 46% 
C) 70% 
D) 81.2% 
A) 50% 
B) 46% 
C) 70% 
D) 81.2%

SMPS is used for

What is the output as a function of the input voltage (for positive values) for the given figure. Assume it's an ideal op-amp with zero forward drop (Di=0)

If peak voltage for a half wave rectifier circuit is 5V and diode cut in voltage is 0.7, then peak inverse voltage on diode will be?

Due to centre tap Vm=400/2=200) IRMS=198/?2=140mA, IAVG=2*198/ ?=126mA. ?=[(140/126)2-1]1/2=0.48. So, ?=48%.

------------------is used in the rotating type UPS system to supply the mains.

A full wave rectifier delivers 50W to a load of 200?. If the ripple factor is 2%, calculate the AC ripple across the load.

What is done in switching regulators to minimize its power dissipation during switching?

The arrow on the symbol of MOSFET indicates

The output characteristics of a MOSFET, is a plot of

If the input frequency of a half wave rectifier is 100Hz, then the ripple frequency will be

In the internal structure of a MOSFET, a parasitic BJT exists between the

-----------------is used for critical loads where temporary power failure can cause a great deal of inconvenience.

Efficiency of a half wave rectifier is

Transformer utilisation factor of a half wave rectifier is

The controlling parameter in MOSFET is

Choose the correct statement

In the transfer characteristics of a MOSFET, the threshold voltage is the measure of the

Static UPS requires

In a half wave rectifier, the sine wave input is 50sin50t. If the load resistance is of 1K, then average DC power output will be?

Efficiency of a centre tapped full wave rectifier is

Bipolar Junction Transistors BJTS

BJT Stability and Biasing Techniques

Transistor Biasing and Circuit Analysis

Transistor Amplifier

Electrical Engineering Circuit Analysis

BJT Frequency Response and Capacitance Analysis

Electrical Engineering on Capacitance, Amplifiers, and Switching Regulators

HVDC Transmission, DC Power Supplies, and Zener Diodes

Filters

Exam 8: Electronics and Power Supply

SMPS is used for

What is the output as a function of the input voltage (for positive values) for the given figure. Assume it's an ideal op-amp with zero forward drop (Di=0)

If peak voltage for a half wave rectifier circuit is 5V and diode cut in voltage is 0.7, then peak inverse voltage on diode will be?

Due to centre tap Vm=400/2=200) IRMS=198/?2=140mA, IAVG=2*198/ ?=126mA. ?=[(140/126)2-1]1/2=0.48. So, ?=48%.

------------------is used in the rotating type UPS system to supply the mains.

A full wave rectifier delivers 50W to a load of 200?. If the ripple factor is 2%, calculate the AC ripple across the load.

What is done in switching regulators to minimize its power dissipation during switching?

The arrow on the symbol of MOSFET indicates

The output characteristics of a MOSFET, is a plot of

If the input frequency of a half wave rectifier is 100Hz, then the ripple frequency will be

In the internal structure of a MOSFET, a parasitic BJT exists between the

-----------------is used for critical loads where temporary power failure can cause a great deal of inconvenience.

Efficiency of a half wave rectifier is

Transformer utilisation factor of a half wave rectifier is

The controlling parameter in MOSFET is

Choose the correct statement

In the transfer characteristics of a MOSFET, the threshold voltage is the measure of the

Static UPS requires

In a half wave rectifier, the sine wave input is 50sin50t. If the load resistance is of 1K, then average DC power output will be?

Efficiency of a centre tapped full wave rectifier is

Bipolar Junction Transistors BJTS

BJT Stability and Biasing Techniques

Transistor Biasing and Circuit Analysis

Transistor Amplifier

Electrical Engineering Circuit Analysis

BJT Frequency Response and Capacitance Analysis

Electrical Engineering on Capacitance, Amplifiers, and Switching Regulators

HVDC Transmission, DC Power Supplies, and Zener Diodes

Filters