Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be |

A. | 0.9 [Wrong Answer] |

B. | 0.8 [Wrong Answer] |

C. | 0.75 [Correct Answer] |

D. | 0.6 [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ The minimum gate source voltage that creates the

*n*-type inversion layer is called

cut off voltage

on voltage

threshold voltage

zener voltage

⇒ An ac network has a power factor of 0.8 lagging for fundamental frequency. If the applied voltage contains thrid and fifth harmonics, the overall power factor will be

more than 0.8 lagging

0.8 lagging

less than 0.8 lagging

0.8 lagging or less

⇒ For ideal performance, a filter should be terminated in characteristic impedance.

TRUE

FALSE

⇒ A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is

1.26 x 10

^{6}W

1.26 x 10

^{-2}W

1.26 x 10

^{-8}W

1.26 x 10

^{-16}W

⇒ FM has

two sidebands only

four sidebands only

eight sidebands only

infinite sidebands

⇒ Out of S, R, J, K, Preset, Clear inputs to flip flops, the synchronous inputs are

S, R, J, K only

S, R, Preset, Clear only

Preset, Clear only

S, R only

⇒ Over which frequency range the effect of atmospheric noise is significant?

Over 35 MHz

Below 30 MHz

Between 30 MHz and 100 MHz

Between 100 MHz and 150 MHz

⇒ In the amplifier circuit figure the quiescent point voltage and current

12 V, 5 mA

12 V, 2 mA

10 V, 2 mA

10 V, 5 mA

⇒ The mean life time of the minority carriers is in the range of a few

seconds

milli seconds

micro seconds

nano seconds

⇒ For a reflection co-efficient of 0.5, the value of SWR is

-1

1

2

3

⇒ Which of the following terms are equivalent?

- A ⊕ B ⊕ C
- A ⊕ B ⊙ C
- A ⊙ B ⊕ C
- A ⊙ B ⊙ C

1 and 4; 2 and 3

1 and 3

2 and 3

1, 2 and 4

⇒ Consider the following statements

- A 33 MHz 486 has higher MIPS than 33 MHz 386.
- A 33 MHz 486 has higher MFLOPS than 33 MHz 386 of these statements.

Both are true

Both are false

1 is true and 2 is false

1 is false and 2 is true

⇒ The resolution of a wire wound potentiometer is about

0.00001

0.001

0.01

0.05

⇒ In figure V is ideal voltmeter having infinite resistance. It will read __________ v

40

60

0

100

⇒ DeMorgan's first theorem shows the equivalence of

OR gate and Exclusive OR gate

NOR gate and Bubbled AND gate

NOR gate and NAND gate

NAND gate and NOT gate

⇒ The graph of a network has 6 branches with 3 tree branches. The minimum number of equations required for solution of network is

2

3

4

5

⇒ When load is coupled to class A amplifier through transformer, efficiency decreases.

TRUE

FALSE

⇒ An image uses 512 x 512 picture elements. Each element can take any of eight distinguishable levels. The maximum entropy in the above image will be

2097152 bits

786432 bits

648 bits

144 bits

⇒ The light output of LED varies as (current)

^{n}. The value of

*n*is about

0.5

1

1.3

2.1

⇒

Match the following:

List I (Application of circuit) | List II (Circuit Name) | ||
---|---|---|---|

A. | Divider | 1. | Astable multivibrator |

B. | Clips input voltage at two predetermined levels | 2. | Schmitt trigger |

C. | Square wave generator | 3. | Bistable multivibrator |

D. | Narrow current pulse generator |

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

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

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

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

⇒ In the below figure, the load is highly inductive. The firing angle is a for each of the thyristors. The periods of conduction of Th

_{1}and Th

_{2}respectively

0 to p and p to 2p

a to p and p + a to 2p

a to p + a and p + p to 2p + a

a to p - a and p + a to 2p - a

⇒ The I/P impedance (Z

_{i}) and the O/P impedance (Z

_{o}) of an ideal trans conductance (Voltage controlled current source) amplifier are

Z

_{i}= 0, Z

_{o}= 0

Z

_{i}= 0, Z

_{o}= ∞

Z

_{i}= ∞, Z

_{o}= 0

Z

_{i}= ∞, Z

_{o}= ∞

⇒ The microprograms provided by a manufacturer to be used on his microprogrammed computer are generally called

software

network

firmware

hardware

⇒ For a Mod-64 synchronous counter the number of flip flops and AND gates needed is

6 and 4 respectively

4 and 6 respectively

7 and 5 respectively

5 and 7 respectively

⇒ Turn on time of a transistor switch is equal to sum of (where

*t*

_{r}is rise time,

*t*

_{d}is delay time)

*t*

_{s}-

*t*

_{r}

*t*

_{s}-

*t*

_{f}

*t*

_{d}+

*t*

_{r}

2

*t*

_{r}

⇒ If the minimum range of a radar is to be doubled, the peak power has to be increased by a factor of

2

4

8

16

⇒ For the given circuit, the current

0.0833333333333333

0.208333333333333

0.291666666666667

0.333333333333333

⇒ If a two port network is represented by an equivalent T network, the impedance of shunt arm in terms of ABCD parameters is equal to

1/C

(A - 1)/C

1/B

(D - 1)/C

⇒ A retriggerable one shot is one which

can be triggered only once

has two quasi stable states

can not be retriggered till the complete pulse appears at output

can be retriggered while the output is being generated

⇒ Consider the following advantages of phase array radar

- simple circuitry
- ability to track and scan simultaneously
- ability to track many targets together
- very fast scanning

1, 2, 3

1, 3, 4

2, 3, 4

1, 4 only