Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

Which one of the following phrases most accurately describes a purely inductive circuit?

A

Resistances provide the only opposition to current flow

B

Inductive reactance provides the only opposition to current flow

C

Combinations of resistance and inductive reactance provide any opposition to current flow

D

The ac voltage lags the current by 90 degree

E

None of the above

Which one of the following phrases most accurately describes a purely capacitive circuit?

A

Resistances provide the only opposition to current flow

B

Capacitive reactance provides the only opposition to current flow

C

The ac voltage leads the current by 90 degree

D

Combinations of resistance and capacitive reactance provide any opposition to current flow

E

None of the above

Which one of the following statements most accurately describes the nature of inductive reactance?

A

Inductive reactance is an opposition to current flow in dc circuits

B

Inductive reactance is an opposition to current flow in ac circuits

C

Inductive reactance is another term for counter emf

D

Inductive reactance is a force that tends to overcome the effects of counter emf

E

None of the above

স্পন্দনশীল ডিসি থেকে ধ্রুব ডিসি ভোল্টেজ পেতে নিচের কোন যন্ত্রটি ব্যবহার করা হয়? (Which of the following devices is used to get a pure DC voltage from pulsating DC?)

A

ব্যাটারী (Battery )

B

রোধ (Resistor)

C

ডায়োড (Diode)

D

ধারক (Capacitor)

Which of the following is most prone to pulsating discharge flow ?

A

Centrifugal pump

B

Reciprocating pump

C

Gear pump

D

Axial flow pump

Which one of the following statements most accurately reflects the nature of ac power?

A

The current in an ac circuit flows in one direction, but changes value periodically

B

The current in an ac circuit flows in one direction at a steady level

C

The current in an ac circuit changes direction periodically

D

The current in an ac circuit flows in two directions at the same time

E

None of the above

The pulsating torque exerted by steam locomotives causes which of the following?

A

Jolting and skidding

B

Hammer blow

C

Pitching

D

All of the above

The pulsating d.c. applied to power amplifier causes ___________

A

Burning of transistor

B

Hum in the circuit

C

Excessive forward voltage

D

None of the above

The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

A

Detonation

B

Turbulence

C

Pre-ignition

D

Supercharging

Which one of the following keys is most often used to align columns of text accurately?

A

Border

B

Tab

C

Enter

D

Space

Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

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