A 3 phase semiconverter when supplying a certain load has a rectification effici

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Question
A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load
Options
A. rectification efficiency will be more than 0.6 and TUF will be more than 0.35
B. rectification efficiency will be more than 0.6 but TUF will be less than 0.35
C. rectification efficiency will be less than 0.6 and TUF will be less than 0.35
D. rectification efficiency will be less than 0.6 but TUF will be more than 0.35

Correct Answer

rectification efficiency will be more than 0.6 and TUF will be more than 0.35

More questions

1. An RC snubber circuit is used to protect a thyristor against :
Options
A. false triggering
B. failure to turn on
C. switching transients
D. failure to commutate

2. The displacement flux density at a point on the surface of a perfect conductor is = 2(a_x - 3 a_z)c/m² pointing away from the surface. The charge density at that point c/m² will be
Options
A. 2
B. - 2
C. 4
D. - 4

3. To increase Q factor of a coil, the wire should be
Options
A. long
B. thin
C. thick
D. long and thin

4. Match the following:

	List I (DOS commands)		List II (Meaning)
A.	ATTRIB	1.	Displays all directories and subdirectories
B.	SCAN DISK	2.	Moves files to another director
C.	MOVE	3.	Checks the status of disc
D.	TREE	4.	Hides a file

Options
A. A-1, B-2, C-3, D-4
B. A-3, B-4, C-2, D-1
C. A-2, B-3, C-4, D-1
D. A-4, B-3, C-2, D-1

5. Match the following:

	List I		List II
A.	SSB Modulation	1.	Transmission line
B.	? . B = 0	2.	Hilbert transform
C.	Model dispersion	3.	Faraday's law
		4.	Absence of magnetic monopoles
		5.	Waveguides
		6.	Phase locked loop

Options
A. A-1, B-3, C-5
B. A-5, B-4, C-2
C. A-6, B-4, C-5
D. A-2, B-4, C-5

6. Match the following:

	List I		List II
A.	(? x E)ds = 0	1.	Continuity equation
B.	rv.dv = Q	2.	Ampere's law
C.	(J + D)ds	3.	Gauss law
D.	-r_vdv	4.	Faraday's law
E.	H.dl = (? x H)ds	5.	Stoke's theorem

Options
A. A-4, B-3, C-2, D-1, E-5
B. A-1, B-2, C-3, D-4, E-5
C. A-4, B-2, C-1, D-3, E-5
D. A-1, B-5, C-4, D-2, E-3

7. Match the following:

	List I (Command in WORD)		List II (Meaning)
A.	END	1.	The bar displays the current position of cursor
B.	HOME	2.	Moves cursor to the beginning of current line
C.	Status	3.	Moves cursor to end of document

Options
A. A-1, B-2, C-3
B. A-3, B-1, C-2
C. A-2, B-3, C-1
D. A-3, B-2, C-1

8. Match the following:

	List I		List II
A.	Penetration frequency	1.	Lowest frequency at which charged particles spiral in fixed magnetic field
B.	Optimum working frequency	2.	Same as critical and frequency
C.	Gyro frequency	3.	Highest frequency of radio waves that can be used
D.	Maximum usable frequency	4.	The most effective frequency for ionosphere propagation of radio waves

Options
A. A-2, B-4, C-1, D-3
B. A-4, B-1, C-3, D-2
C. A-1, B-3, C-2, D-4

9. Match the following:

	List I		List II
A.	Output of signal generator	1.	Modulated
B.	Error signal from a synchro	2.	Digital
C.	Output of a JK flip flop	3.	Analog
D.	Signal received by radar	4.	Stoichastic

Options
A. A-1, B-3, C-2, D-4
B. A-3, B-1, C-2, D-4
C. A-3, B-1, C-4, D-2
D. A-1, B-3, C-4, D-2

10. Match the following:

	List I		List II
A.	TV	1.	1 kHz
B.	Radio	2.	3 kHz
C.	Telephony	3.	9 kHz
D.	Telegraphy	4.	5 MHz

Options
A. A-4, B-1, C-2
B. A-4, B-3, C-2
C. A-2, B-1, C-3
D. A-1, B-2, C-3

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