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Q1. | A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90°, the speed is likely to be |

A. | about 300 rpm [Correct Answer] |

B. | about 150 rpm [Wrong Answer] |

C. | about 75 rpm [Wrong Answer] |

D. | about zero [Wrong Answer] |

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

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Very low response at very high frequencies | 1. | Low-pass system |

B. | Over shoot | 2. | Velocity damping |

C. | Synchro-control transformer output | 3. | Natural frequency |

4. | Phase-sensitive modulation | ||

5. | Damping ratio |

A-1, B-5, C-4

A-3, B-2, C-4

A-2, B-5, C-4

A-4, B-1, C-3

⇒ Dynamic range of hi-fi system is at least

150 dB

120 dB

80 dB

40 dB

⇒ A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at

*t*=

zero

infinity

L/R

R/L

⇒ Find R

_{L}for maximum power tran

3 Ω

1.125 Ω

4.17 Ω

none

⇒ If the connection of two-port is such that the transmission matrix of the overall network is the product of the transmission matrices of the individual networks, what type of connection is it?

Series connection

Cascade connection

Parallel connection

None of the above

⇒ At room temperature, the current in the, intrinsic semiconductor is due to

holes

electrons

ions

holes and electrons

⇒ By placing an inverter between both inputs of an S-R flip-flop, the resulting flip-flop becomes

J-K flip-flop

D-flip-flop

T-flip-flop

Master salve JK flip-flop

⇒ Two coupled coils lie in parallel planes such that 50% of magnetic flux produced by one links the other. The coefficient of coupling is

0.5

0.25

0.125

0.5

⇒ If σ standard deviation, probable error

σ

± 1.19 σ

± 0.6745 σ

± 0.4125 σ

⇒ In an RC impedance function

the highest critical frequency is a pole

the highest critical frequency is a zero

the highest critical frequency is a pole or zero

the highest critical frequency is a pole at

*s*= 0

⇒ In a purely resistive circuit the instantaneous power varies from zero to maximum twice in each cycle.

TRUE

FALSE

⇒ Which of the following is true?

SOP is a two level logic

POS is a two level logic

Both SOP and POS are two level logic

Hybrid function is two level logic

⇒ Consider the following, logic diagr

0000 to 1111

0000 to 1001

0000 to 1010

1001 to 0000

⇒ Two ammeters A and B both 0-10 A have internal resistance of 1 Ω and 0.5 Ω respectively. They are connected in parallel. If total current is 15 A, then

I

_{A}= I

_{B}= 7.5 A

I

_{A}= 5 A, I

_{B}= 10 A

I

_{A}= 10 A, I

_{B}= 5 A

I

_{A}= 9 A, I

_{B}= 6 A

⇒ In a multicavity klystron amplifier the electron velocity of the order of

10 m/s

10

^{3}m/s

10

^{6}

*m*/

*s*

10

^{12}

*m*/

*s*

⇒ Which capacitor-store higher amount of energy?

Air capacitor

Paper capacitor

Mica capacitor

Plastic film capacitor

⇒ Medium scale integration refers to ICs with

more than 12 but less than 30 gates on the same chip

more than 50 gates on the same chip

more than 20 but less than 100 gates on the same chip

more than 12 but less than 100 gates on the same chip

⇒ At room temperature the number of conducting electrons in an intrinsic semiconductor

is almost equal to the number of valence electrons

is about half the number of valence electrons

is small as compared to the number of valence electrons

is a very small fraction of the number of valence electrons

⇒ A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make

1200 revolutions

1800 revolutions

2100 revolutions

2400 revolutions

⇒

**Assertion (A):** A parallel resonant circuit is also called anti-resonant circuit.

**Reason (R):** In a parallel resonant circuit impedance is maximum at resonance.

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

⇒ The multivibrator circuit that has a typical application of converting sinusoidal input into a square wave output is

emitter coupled binary

Schmitt trigger

monoshot multivibrator

free-running multivibrator

⇒ Quantizing error occurs in

TDM

FDM

PCM

PWD

⇒ The sum S of A and B in a Half Adder can be implemented by using K NAND gates. The value of K is

3

4

5

none of these

⇒ 2's complement representation of a 16 bit number (one sign bit and 15 magnitude bits) is FFFF. Its magnitude in decimal representation is

0

1

32, 767

65, 535

⇒ The voltage gain of which transistor configuration is less than unity?

CB

CE

CC

None

⇒ Oscillations are obtained from a reflex klystron only for combinations of anode voltage and repeller voltage that give a favourable transit time.

TRUE

FALSE

⇒ A parallel RLC circuit has ω

_{0}= 10

^{6}and Q = 30, Given C = 30 pF, the value of R is

0

1 μΩ

2 MΩ

1 MΩ

⇒ When three 100 K, ± 10% fixed resistors of 1/4 W Power rating are connected in parallel, the resulting 33 K resistor will have a tolerance specification and power rating of

± 10% and 3/4 W respectively

± 10% and 1/12 W respectively

± 3.3.% and 3/4 W respectively

± 30% and 3/4 W respectively

⇒ A UJT exhibits negative resistance characteristics when

Current is less than valley current

Current is less than peak current

Current is more than peak current but less than valley current

None of the above

⇒ The bandwidth of DSB suppressed carrier modulation system when the modulating frequency varies between 500 Hz and 5 kHz is

555 kHz

505 kHz

500 kHz

9 kHz