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Q1. | Efficiency of a half wave diode rectifier is less than 40%. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ The phase velocity in a coaxial line is

greater than C

equal to C

less than C

not depend on C

⇒ If

*f*(

*t*)↔ F(

*j*ω), and

*f*(

*t*) is real, then F(-

*j*ω)

*F*(

*j*ω)

*F**(

*j*↔)

*F**(-

*j*ω)

none of these

⇒ Which control action is also called rate control?

Proportional

Derivative

Integral

Proportional plus integral

⇒ Which of the following operations will give the result 2 in C?

42857

4.0 / 2

4.0 / 2.0

4 / 2.0

⇒ In a micro computer the control bus

transmits and receives control signals between processor and other devices

transmits and receives control signals, also sends and receives data

transmits and receives control signals, sends and receives data and transmits address of the device

none of the above

⇒ The transfer function V

_{2}/V

_{1}for figure

a zero at origin

a zero at infinity

no zero

a zero at

*j*1

⇒ Consider the following statements

- In a pulsed radar, the transmitted pulses are of high frequency
- In a pulsed radar, the transmitted pulses are of high power
- In a pulsed radar, the transmitted pulses are of brief duration
- In a pulsed radar, the transmitted pulses are of square wave shape.

1 only

1, 2 and 3 only

1, 2, 3, 4

1 and 3 only

⇒ The probability giving distribution of electrons over a range of allowed energy levels is known as

Maxwell's Distribution

Fermi-Dirac Distribution

Richardson Dushman Distribution

none of the above

⇒ The minimum decimal equivalent of the number 11C0 is

183

194

268

269

⇒ Curl of gradient A is

∇ x (∇A) = 1

∇ x (∇A) = ∞

∇ x (∇A) = 0

∇ x (∇A) = - ∞

⇒ An FM signal has modulating frequency

*f*and maximum frequency deviation of δ. The bandwidth will be nearly equal to

_{m}δ

2 δ

2

*f*δ

_{m}*f*δ

_{m}⇒

**Assertion (A):** In a parallel circuit having two branches, each branch current may be more than source current.

**Reason (R):** Calculations in ac circuits use rules of complex algebra.

Both A and R are true and R is correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

⇒ Single parity check is not reliable in case of

paper tape

magnetic tape

magnetic drum

cores

⇒ In the amplifier circuit of figure

*h*

_{fe}= 100 and

*h*

_{ie}= 1000 Ω. The voltage gain of amplifier is a

0.33

0.5

0.66

1

⇒ If reference sound pressure P

_{0}is 2 x 10

^{-5}N/m

^{2}, a sound pressure of 90 dB is equal to

0.632 N/m

^{2}

0.707 N/m

^{2}

0.835 N/m

^{2}

0.925 N/m

^{2}

⇒ Which of the following statements is written in plain English in 8085?

Data definition

Assignment

Conditional

Repetitive

⇒ If V

_{a0}, V

_{a1}, V

_{a2}are sequence components of V

_{a}and I

_{a0}, I

_{a1}, I

_{a2}are sequence components of I

_{a}, then total 3 phase power P is given by

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*}

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2})

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*})

⇒ Atomic and molecular resonance is observed in many substances

at microwave frequencies

at low frequencies

at frequencies used in AM broadcast

at both (b) and (c)

⇒ Highest resistivity of the following is

nichrome

constantan

metal

manganin

⇒ The stack is a specialized temporary __________ access memory during __________ and __________ instructi

random, store, load

random, push, load

sequential, store, pop

sequential, push, pop

⇒ In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is

150 A

75 A

50 A

300 A

⇒ In the given figure the circuits for input impedance of a microwave device with output ports match terminated. The devic

E plane tee

H plane tee

magic tee

hybrid ring

⇒ A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10

*n*F capacitor in the second branch. At resonance frequency is

100 rad/sec

10000 rad/sec

1000 rad/sec

more than 10000 rad/sec

⇒ In a tape recorder

both record and erase heads have high permeability core

the record head has high permeability core but the erase head has low permeability core

the record head has low permeability core but the erase head has high permeability core

both record and erase heads have low permeability core

⇒ Maxwell's curl equation for the static electric field E can be expressed as

Δ x E = 0

Δ x E = constant

Δ - E = constant

Δ . E = 0

⇒ At millimeter wavelength the favoured mode in circular wave guide is

TE

_{01}

TE

_{11}

TE

_{20}

TE

_{21 }

⇒ Which of the following is used in lightning arresters?

Thermistor

Photoconductor

Transistor

Varistor

⇒

Match the following:

List I (Characteristic equation) | List II (Degree of damping) | ||
---|---|---|---|

A. | s^{2} + 15s + 56.25 | 1. | Undamped |

B. | s^{2} + 5s + 6 | 2. | Underdamped |

C. | s^{2} + 20.25 | 3. | Critically damped |

D. | s^{2} + 4.55s + 42.25 | 4. | Overdamped |

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

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

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

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

⇒ The function δ(

*t*-

*b*) is

an impulse function

a step function originating at

*t*=

*b*

an impulse function originating at

*t*=

*b*

none of the above

⇒ In a circuit the value of resistor is made four times. The noise voltage generated by this resistance will

be doubled

be increased four times

remain the same

become half