D:-5
Correct Answer:- Option-A

Question84:-The resolution of a 4-bit counting ADC is 0.5 Volts. For an analog input
of 7.3 Volts, the digital output of the ADC will be

A:-1011
B:-1111
C:-1100
D:-1101
Correct Answer:- Option-B

Question85:-A fixed-duty cycle DC-DC boost converter with a 100 W rating draws
10A from the input DC supply when powering a 100W, 25V DC load. What is the
required input DC supply rating for proper operation when the converter is used to
power a 30V DC load that draws 2A ?

A:-12V, 3A
B:-25V, 5A
C:-12V, 5A
D:-25V, 4A
Correct Answer:- Option-C

Question86:-A single-phase to single-phase cycloconverter is used to control a
240V, 60Hz single-phase induction motor with V/f control. The cycloconverter has
an input AC of 300V. If the motor is running at half of its rated speed with a power
factor of 0.75, what is the AC input power factor of the cycloconverter ?

A:-0.75
B:-0.50
C:-0.30
D:-0.25
Correct Answer:- Option-C

Question87:-Which statement accurately describes a MOSFET ?
A:-MOSFET is an ON controlled device
B:-MOSFET is an OFF controlled device
C:-MOSFET is an ON and OFF controlled device
D:-MOSFET is an uncontrolled device
Correct Answer:- Option-C

Question88:-A step-down chopper is used for speed control of a DC motor. If the
turn-on time of the MOSFET is decreased by 20% un-altering the switching
frequency, what will be the new average output voltage compared to the previous
average output voltage ?

A:-0.2 times
B:-0.8 times