A chopper cannot be line commutated. True False

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Power Electronics See What Others Are Saying!

Question
A chopper cannot be line commutated.
Options
A. True
B. False

Correct Answer

True

More questions

1. Match the following:

	List I (Functional headings of instruction set of 8085)		List II (Functions performed)
A.	Branch group	1.	Compares, rotates etc.
B.	Logic group	2.	Moves, loads, stores etc.
C.	Data transfer group	3.	Initiates conditional or unconditional jumps, calls etc.

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

2. Match the following:

	List I (Types of memory)		List II (Used As)
A.	DRAM	1.	Cache memory
B.	SRAM	2.	Main memory
C.	Parallel Access Registers	3.	BIOS memory
D.	ROM	4.	CPU registers

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

3. To couple a coaxial line to a parallel wire line it is best to use
Options
A. slotted line
B. balun
C. directional coupler
D. ?/4 transformer

4. TM₀₁ mode in circular waveguide is analogous to
Options
A. TM₁₀ mode in square waveguide
B. TM₁₁ mode in square waveguide
C. TM₂₀ mode in square waveguide
D. TM₀₂ mode in square waveguide

5. In a single phase full wave ac regulator feeding R-L load, the gate pulses
Options
A. are always of short duration
B. may be of short duration
C. should be rectangular with width (p - a)
D. cannot be rectangular with width (p - a)

6. A magic tee is to be used as CW duplexer. Then port 1, port 2, port 3 (E arm), port 4 (H arm) respectively should be connected to
Options
A. matched load, antenna, receiver and CW transmitter
B. CW transmitter, antenna, receiver and matched load
C. CW transmitter, receiver, antenna and matched load
D. CW transmitter, matched load, receiver and antenna

7. A dynamometer wattmeter is connected in ac circuit. The measured power is
Options
A. rms power
B. average power
C. peak power
D. instantaneous power

8. Dielectric constant and conductivity of rocky soil and flat sandy soil are around
Options
A. 10 and 20 mho/cm respectively
B. 20 and 10 mho/cm respectively
C. 2 and 5 mho/cm respectively
D. 0.5 and 2 mho/cm respectively

10. In the circuit of figure the function of resistor R and diode D are
Options
A. to limit the current and to protect LED against over voltage
B. to limit the voltage and to protect LED against over current
C. to limit the current and protect LED against reverse breakdown voltage.
D. none of the above.

Comments

More in Electronics and Communication Engineering: