A voltmeter is connected across the current path.

A voltmeter has a resistance of G ohms and range V volts. The value of resistance required in series to convert it into voltmeter of range nV is ___________.

A

nG

B

$$\frac{{\text{G}}}{{\text{n}}}$$

C

$$\frac{{\text{G}}}{{{\text{n}} - 1}}$$

D

(n - 1)G

A voltmeter is connected in a ___________ with the circuit component across which potential difference is to be measured.

A

Parallel

B

Series

C

Series or parallel

D

None of the above

An ammeter is connected across the current path.

A

True

B

False

When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel and $$\varphi $$ = Pressure angle)

A

$$\frac{{\left( {{{\text{r}}^2} + {{\text{R}}^2}} \right)\cos \varphi }}{2}$$

B

$$\frac{{\left( {{{\text{r}}^2} + {{\text{R}}^2}} \right)\sin \varphi }}{2}$$

C

$$\frac{{\left( {{\text{r}} + {\text{R}}} \right)\cos \varphi }}{2}$$

D

$$\frac{{\left( {{\text{r}} + {\text{R}}} \right)\sin \varphi }}{2}$$

The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

A

Active power in R phase

B

Active power of Y phase

C

Reactive power of R phase

D

Power proportional to 3 phase power if the load is balanced

সিরিজে সংযুক্ত একটি এ্যামিটার এবং একটি অজানা রোধ দুটি একই রকম 1.5 V ব্যাটারীর দুই প্রান্তে সংযুক্ত আছে। যখন ব্যাটারী দুটি সিরিজে সংযুক্ত থাকে তখন এ্যামিটার। amp রিডিং প্রদর্শন করে। আবার ব্যাটারী দুটি সমান্তরালে সংযুক্ত করলে 0.6 amp রিডিং প্রদর্শন করে। ব্যাটারীর আভ্যন্তরিন রোধ কত ? (An ammeter and an unknown resistance are connected in series across two identical batteries of each 1.5 V. The ammeter shows current I amp and 0.6 amp when the batteries are connected in series and parallel, respectively. What is the internal resistance of the battery?)

A

13Ω

B

12Ω

C

1Ω

D

0.1Ω

E

23Ω

কমন গ্রামিটার বর্তনীতে একটি n-p-n ট্রানজিস্টরের সংগ্রাহকে 8 V ব্যাটারী সংযুক্ত আছে। সংগ্রাহক Rt রোধের দুই প্রান্তে বিভব পতন 0.5 V হলে বেস কারেন্ট নির্ণয় কর। [দেওয়া আছে Rt = 800 Ω এবং বর্তনীর α =0.96)(An n-p-n transistor is connected in common emitter configuration in which the collector supply is 8 V. Determine the base current, if the voltage drops across the resistance Re of the collector circuit is 0.5 V. [Rt = 800Ω and α = 0.96])

A

0.625 mA

B

0.000625 mA

C

0.974 mA

D

0.026 mA

E

0.000026 mA

A galvanometer can be converted to a voltmeter by connecting

A

a high resistance in parallel

B

a high resistance in series

C

a low resistance in series

D

a low resistance in parallel

Ryall crest voltmeter is used for measurement of

A

AC voltage of any form

B

Low frequency voltage

C

High DC voltage

D

High AC voltage

The multiplier and the meter coil in a voltmeter are in

A

Series

B

Parallel

C

Series-parallel

D

None of the above

A voltmeter is connected across the current path.

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